You are about to take the
Corrosion Control Training slide
show. There is a test at the end of
Click PAGE DOWN
THE FOLLOWING SUBJECTS WILL BE COVERED
DURING THIS TRAINING SESSION
1. Theory and Causes of Corrosion
2. Corrosion Prevention
3. Corrosion Identification
4. Corrosion Removal
5. Corrosion Treatment
6. Local Corrosion Threats
THEORY AND CAUSES OF
• Concept and Objective of CPCP
• Corrosion Control Technical Publications
• Electrochemical Theory of Corrosion
• Biochemical Theory of Corrosion
• Environmental Factors and Corrosion
OBJECTIVE OF THE CPCP
The purpose of the Corrosion Prevention
and Control Program (CPCP) is to prolong the
life of all USAF systems and equipment
through corrosion prevention and proper
treatment. Success of the CPCP depends upon
you and every maintenance technician
becoming properly trained and practicing
proper corrosion prevention and treatment
• TO 00-25-234 GENERAL SHOP PRACTICE
REQUIREMENTS - A wealth of information on electric
and electronic workmanship standards, soldering, printed
circuit board repair, cable and connector fabrication, and
many other related subject areas. It addresses cleaning
procedures, corrosion prevention treatments, and protective
coatings to be used during maintenance and repair actions.
• TO 1-1-8 APPLICATION OF ORGANIC COATINGS,
AEROSPACE EQUIPMENT - In-depth guidance for
application of protective coatings on all types of Air Force
equipment. Selection of the proper coatings, and knowing
exactly how to apply them is critical in corrosion
• TO 1-1-689 AVIONICS CLEANING AND
CORROSION PREVENTION-CONTROL - Although
written for Air Force and Navy avionics systems, this TO
provides valuable information on corrosion theory,
preventive maintenance, corrosion treatment and repair,
corrosion control procedures for electrical bonding and
grounding, and equipment cleaning procedures.
• TO 1-1-691 AIRCRAFT WEAPONS SYSTEMS
CLEANING AND CORROSION CONTROL - A joint
Air Force, Army, and Navy aircraft oriented publication that
contains in-depth corrosion theory, prevention, and
treatment information. It also contains many informative
charts and tables.
• TO 31Z-10-37 CORROSION PREVENTION AND
ENGINEERING) - Written specifically for ground C-E
facilities. This TO covers corrosion theory, prevention, and
treatment information and guidance in the ground
communications environment during installation, operation,
All of these technical orders
are available for reference in
Maintenance Support, except
for TO 1-1-691. This tech
order can be found on
You can also find TO 00-25-
234 and TO 1-1-8 on the P:
ELECTROCHEMICAL THEORY OF
Corrosion is the deterioration of a material caused by a
reaction with the environment. The reaction is
usually electrochemical but it can also be caused by
biochemical factors. In each case, corrosion usually
begins on the material surface and, if allowed to
progress, works its way into the material core as
Some types of corrosion originate within the material
core, but most corrosion starts on the surface where it
can be prevented or properly treated in its early stages.
ELECTROCHEMICAL CELLS - The electrochemical
process is similar to the current flow in a common dry cell
battery. Corrosion by-products are formed when one part
of a metal acts as a negative element (cathode) and another
part acts as a positive element (anode). When an
electrolyte is present, an electrochemical cell is formed and
current flows between the two charged elements. The
electrolyte may be an acid, alkali, or just plain moisture.
The current flow destroys some of the anode material and
forms by-products that appear as corrosion.
ELEMENTS OF AN ELECTROCHEMICAL CELL
To form an electrochemical cell, four elements are
1. Anode 2. Cathode 3. Electrolyte
4. Metallic contact between the anode and cathode
The following figure depicts the electrochemical process.
In the following figure, one of the four elements, the electrolyte,
has been removed by using a protective coating.
The basis of your corrosion control program is ensuring the
integrity of all protective barriers and removing all
electrolytes. This is due to the fact that the electrolyte is the
only element you can easily control.
BIOCHEMICAL THEORY OF CORROSION
Although not as common, you need to be aware of
biochemical corrosion. Biochemical corrosion is caused
by fungi and waste products from animals and insects.
FUNGI - Mold, mildew, smut and bacteria draw oxygen from
the air and hold moisture against the material to which they
are attached. An acid-based waste product is produced
causing surface corrosion. Moisture contained in the fungi
can also cause intermittent equipment problems that are
very hard to isolate.
ANIMALS AND INSECTS - Waste products
normally include salts and acids which corrode
metallic surfaces. They may also eat insulation,
paint, or other protective coatings which exposes
the surface to electrochemical corrosive attacks.
ENVIRONMENTAL FACTORS AND
Moisture is the single most important environmental factor
causing corrosion. Moisture present in the air often
contains contaminants such as chlorides, sulfates, nitrates
and other chemicals which accelerate corrosion. Sealed
compartments can expand and contract with temperature
variations, allowing moisture to enter. Temperature
variations also cause condensation on equipment.
Accumulations of dirt and debris can hold moisture against
equipment, accelerating the corrosion process.
California does not hold many records for rainfall, but it is
still a consideration.
The bottom line is:
Keeping equipment clean and properly painted will greatly
decrease the threat of corrosion by moisture.
• Air Force Corrosion Prevention Policy
• Air Force Corrosion Prevention Philosophy
• General Work Practices
• Cleaning Equipment
• Storage, Protection, And Handling Of Equipment
AIR FORCE CORROSION
AF Instruction 32-1054 establishes Air Force policy on
corrosion prevention and control. It requires effective
corrosion prevention programs for all maintenance
activities to enhance safety, extend service life, reduce
maintenance costs and repair man-hours, and minimize
equipment downtime. All maintenance technicians must
have an awareness of the causes of corrosion and practice
corrective preventive techniques.
AIR FORCE CORROSION
Important elements of corrosion prevention include:
• INSPECT for corrosion on a SCHEDULED basis
• TRAIN technicians in corrosion PREVENTION and
• Thoroughly CLEAN, PRESERVE, and LUBRICATE equipment at
• Use APPROVED MATERIALS, EQUIPMENT, and TECHNICAL
• Keep accurate RECORDS and report MATERIEL and DESIGN
DEFICIENCIES that promote corrosion
**Refer to TO 1-1-689, Chapter 3 for more detailed information**
Reporting corrosion problems:
Let’s dwell here for a moment. Reporting corrosion is one of
the most overlooked steps of the entire process. Every
time you find and treat corrosion, you should enter the
correct information in CAMS.
170 - Corroded (or) 667 - Corroded, Severe
ACTION TAKEN CODE:
“Z” - Corrosion Repair (ALWAYS)
Do not forget to enter this in the Automated History when
closing the write-up.
If you suspect corrosion is somehow related to the
manufacturing process, it is important that you submit a
deficiency report through the USAF Deficiency Reporting
System IAW TO 00-35D-54. Maintenance Support will
assist you in this process.
All corrosion problems with real property (buildings, and
large antenna structures, manholes) need to be referred to
the Unit Corrosion Control Monitor for coordination with
the Base Civil Engineering Office.
Corrosion on all vehicles should be documented on the form
1800s for each vehicle and brought to the attention of the
Unit Vehicle Control Officer.
GENERAL WORK PRACTICES
AFQTP 2EXXX-201C (Corrosion Prevention and Control),
TO 00-25-234 and the 31-10 series of TOs (Engineering-
Installation Standards) covers general practices and
corrosion prevention techniques.
Always consult the appropriate Technical Orders prior to
using a particular type of material or mechanical procedure
• DO NOT mark on any metal surface with a graphite pencil
or sharp object
• DO NOT use graphite as a lubricant (it acts as a cathode to
all structural metals)
• DO NOT polish metal surfaces purely for cosmetic
purposes (yes, it promotes corrosion)
• Place protective covers over equipment when drilling,
grinding or sanding
• Replace rusted screws, bolts and washers
• Reapply worn or damaged protective coatings (yes, paint is
a protective coating)
• Keep equipment and work areas free of chips, grit, dirt,
dust and foreign materials
• Clean spills of any type thoroughly and as soon as they
• Handle components and circuit boards carefully (salt and
oil from on your fingers are highly corrosive)
• Remove flux residue after soldering (when flux is
combined with an electrolyte - you guessed it - it is
• Perform detailed corrosion inspections in conjunction with
equipment PMIs (all PMI workcards should require this).
Check for the following:
• Signs of corrosion by-products and equipment damage
– Potential water traps
– Presence of bacteria and fungi
– Areas of dissimilar metal contact that may create
– Presence of dirt, lint, and other contaminates
– Adequacy of protective coatings
– Failure of filter systems
– Signs of moisture or fluids and evidence of faulty seals
and gaskets that could allow moisture intrusion
• Train personnel in the recognition of corrosion inducing
conditions, detection, preservation, treatment and
• Report severe corrosion problems through command
channels to the appropriate item manager
Even under ideal circumstances, corrosion can’t be
completely eliminated. Using the above practices will
keep corrosion to a minimum.
An adequate cleaning program is essential to preventing corrosion.
Equipment should be cleaned frequently using approved materials and
prescribed procedures. Detailed information on correct cleaning
procedure and various types of cleaning agents can be found in
Chapter 4 of TO 1-1-689 and Chapter 3 of TO 1-1-691. Don’t
overlook the specific equipment technical data when doing your
Do not use commercial cleaners unless authorized by the appropriate TO.
Good maintenance practices
dictate using the mildest
cleaning method to remove
Reference the applicable
technical order for the
correct cleaning solution.
There are numerous types of
cleaners available. For
most purposes, detergent
and water are sufficient to
remove dust, dirt and other
• Disconnect power and remove covers
• Ensure all drain holes are open
• Lubricated parts and natural entrapment areas need
protection against damage from cleaning agents. Mask and
protect these surfaces, areas, accessories and components
• Use only authorized cleaning compounds
• Apply the cleaning solution - never spray into electronic
• When complete, examine the area to ensure all
contaminants have been removed
• Check for signs of corrosion
STORAGE, PROTECTION AND
HANDLING OF EQUIPMENT
Okay, now you know all about taking care of equipment.
Something is missing from the picture. Your
responsibility does not stop with mission equipment.
Bench stock items, supply point materials, repair cycle
assets, tools, TMDE, items awaiting parts and equipment
in storage all must be protected and checked for signs of
All unused or inactive equipment must be protected from
moisture by the use of dust caps and proper packaging
techniques. Even the slightest amount of moisture can
cause corrosion so equipment should be stored in a dry
Spare parts and equipment should be stored in hermetically
sealed containers or bags whenever possible. If this is not
possible, use plastic sheeting and carefully seal the
equipment with desiccant. Desiccant is a drying agent, but
the chemicals used in desiccant are corrosive in nature, so
ensure the desiccant bag is free from rips. It is also a good
idea to tape the desiccant to the container to avoid contact
with the equipment.
Use of humidity indicators is also a good idea. If the area
used for storage is in question, a humidity indicator will let
you know if the are is suitable for storage.
Handling of equipment: Most items come in some type of
reusable container. Whenever storing or transporting
equipment or TMDE, use the appropriate container. If one
is not available, use sufficient padding to prevent
scratches, dents and paint chips (ideal places for corrosion
Electrostatic Discharge Sensitive (ESDS) Components: All
ESDS items will be handled, packaged and transported
IAW TO 00-25-234.
• Uniform Surface Corrosion
• Pitting Corrosion
• Galvanic Corrosion
• Filiform Corrosion
• Concentration Cell Corrosion
• Intergranular Corrosion
• Stress & Fatigue Corrosion
• Visual Appearance Of Corrosion By-products On
UNIFORM SURFACE CORROSION
This is the most common type of corrosion. Uniform
corrosion takes place when oxygen, water, ozone, salt or
other materials attack a metal surface. It is a localized
chemical attack which occurs consistently and uniformly
over the entire metal surface. It causes dulling of the
surface initially and may progress until the surface has a
rough texture or frosted appearance. Rusted iron, tarnished
silver and frosted nickel are examples.
This is a common and more severe form of localized
corrosion. Pitting corrosion occurs between grains of an
alloy. It produces various shades of gray or white powder
that form in blotches on the surface of the metal. When the
deposits are removed, tiny pits or holes can be seen.
Aluminum, magnesium and their alloys are very
susceptible to this type of corrosion.
This type of corrosion occurs when two types of dissimilar
metal are joined together. The mating of different types of
metals and alloys promotes electrochemical cell formation
and rapid material deterioration. Whenever you notice
surface dulling, tarnish, powdery deposits or rust near
joints, cowlings, rivets and mated surfaces, you should
suspect galvanic corrosion. Note in the figure below,
corrosion takes place on the anodic material.
COMPATIBLE GROUPING OF METALS
I MAGNESIUM/MAGNESIUM ALLOYS; ALUMINUM/ALUMINUM ALLOYS; TIN
II ALUMINUM; ZINC; CADMIUM; TIN; TIN-LEAD
III ZINC; CADMIUM; STEEL; LEAD; TIN; NICKEL/NICKEL ALLOYS; TIN-LEAD; TITANIUM
COPPER/COPPER ALLOYS; NICKEL/NICKEL ALLOYS; CHROMIUM; STAINLESS STEEL;
IV GOLD; SILVER; TITANIUM
To avoid galvanic corrosion, you must consider the properties of the metals
you are using. Metals in Group I corrode the fastest. Metals in group IV
are the most resistant to corrosion. If you must mix metals, try to use
metals from the same group. If this is not possible, select the metal with
the smallest area from the lower activity group (III & IV). Example: If
aluminum fasteners from group II are not available to install on
aluminum sheet, use fasteners from Group III or IV. If the TO allows,
use sealants or primers to isolate the metals.
Not as common as the previous types of corrosion, this type is
fairly easy to recognize and treat in its early stages. Filiform
corrosion occurs on metal surfaces with organic coatings,
such as petroleum oils and greases. It normally occurs when
the relative humidity is between 78 and 90% and the surface
is slightly acidic. It starts at breaks in the coating (scratches
or nicks). Filiform corrosion has the appearance of worm
like traces underneath the protective coating.
CONCENTRATION CELL CORROSION
Concentration cell corrosion usually forms in cracks and crevices,
metal-to-metal joints, behind or under gaskets, sealants,
electrical tape or other foreign material affixed to metallic
surfaces. The cause of this type corrosion is an imbalance of
oxygen and ions in electrolytes that tend to concentrate under
the surface of the joint or foreign material. If not detected and
corrected early, pitting corrosion usually results.
The following types of
corrosion are hard
to detect until
has occurred. When
discovered, it is
usually beyond your
capability to repair.
This type of corrosion occurs inside the grain of metals when
dissimilar alloys exist side-by-side in the same metal. One alloy
acts as the cathode and the other allot acts as the anode. Many
times intergranular corrosion is the result of improper heat
treatment during manufacture. Because intergranular corrosion
begins internally, it is very difficult to prevent and detect.
Exfoliation corrosion is the physical evidence of advanced
intergranular corrosion. The metal surface is forced up by
the expanding corrosion products below the surface. It can
be identified by metal surface flaking, bumps and blisters,
and metal peeling in layers near edges and joints. When
exfoliation is detected, the only recourse is to replace the
Stress corrosion occurs when opposing or alternating pressure
is applied to a metal surface or structure. This pressure
produces cracks in the grains of the metal allowing
moisture to penetrate. Electrochemical action sets in,
minute cracks appear, split open, and lengthen until they
become visible to the eye. Transportable shelters, antenna
support structures and other types of equipment exposed to
alternating pressure may experience stress corrosion. Look
for minute cracks, incorrectly sized hardware, and
indications of corrosion near joints, corners, and support
Fatigue is the end result of other types of corrosion. When
metal is subjected to repeated mechanical stress and
chemical attack, it becomes fatigued and separates. Severe
pitting, cracking, and separation along stress lines are
evidence of fatigue corrosion.
VISUAL APPEARANCE OF CORROSION
BY-PRODUCTS ON COMMON METALS
Recognizing corrosion is the
key to an effective
Corrosion Prevention and
The table on the next slide
shows different metal
susceptibilities and what
will look like.
ALLOY TYPE OF ATTACK APPEARANCE
Aluminum Alloy Surface, pitting and intergranular. White or gray powder
Titanium Alloy Highly corrosion resistant. Extended or repeated contact No visible corrosion products
with chlorinated solvents may result in embrittlement.
Cadmium plated tools can cause embrittlement of titanium.
Magnesium Alloy Highly susceptible to pitting. White powder snow-like mounds
and white spots on surface
Carbon and Low Alloy Surface oxidation and pitting, surface and intergranular. Reddish-brown oxide (rust)
Steel (100-800 series)
Stainless Steel (300-400 Intergranular corrosion. Some tendency to pitting in Corrosion evidences by rough
series) marine environment (300 series more resistant than 400 surface; sometimes by red,
series). brown or black stain
Nickel-Base Alloy Generally has good corrosion resistant qualities. Sometimes Green powdery deposit
susceptible to pitting.
Copper-Base Alloy Surface and intergranular corrosion. Blue or blue-green powdery
Cadmium (used as a Good corrosion resistance. Will cause embrittlement if not White to brown or black
protective plating) properly applied. mottling on the surface
Chromium (used as a Subject to pitting in the presence of sulfur. Is cathodic to steel, does not
wear-resistant plating) corrode, promotes rusting of
steel where pits occur
Silver Will tarnish in the presence of sulfur. Brown to black film
Gold Highly corrosive resistant. Deposits cause darkening of
Tin Subject to whisker growth. Whisker-like deposits
• Corrosion Removal Tools And Materials
• Corrosion Removal Procedures
Safety is the first consideration when performing
corrosion removal. Common sense and use of proper
protective equipment is a key player here. We will
cover four hazards that require special attention.
1. HIGH VOLTAGE
If there is even a remote chance of coming into contact with
high voltages when removing corrosion, postpone the job
until another time. Never endanger yourself! A second
consideration is doing damage to the equipment. Take
necessary precautions to protect the equipment from
corrosion residue, metal chips and shavings. Always have
a safety observer and post “DANGER - DO NOT
ENERGIZE” signs on all applicable circuit breakers.
Schedule the down time you need to perform the job
The same basic precautions taken around high voltage also
applies to radiation hazards. Most radiation hazards are
encountered by radar and antenna personnel. Corrosion
control actions (or any maintenance) should not be
performed on hot antennas. Again, schedule the down
time that you need. Always post a safety observer and
“DANGER - DO NOT ENERGIZE” signs where
Numerous electronic facilities use battery banks for back-up
power or starting devices. Liquid cell batteries emit toxic
and combustible fumes. The electrolyte used in batteries is
highly corrosive, creating the need for continuous
corrosion control measures. Exercise extreme caution to
avoid inhaling fumes or creating sparks that could cause an
explosion. Always wear goggles, rubber gloves and a
rubber apron when performing corrosion control on
batteries. Ensure eye wash is available. Avoid skin
contact with the electrolyte. Never use power tools around
batteries. Always use a safety observer.
Many corrosion preventives, cleaners, paint strippers, sealers
and solvents are hazardous to the skin, eyes and respiratory
tract. Observe all cautions and warnings listed on the
manufacturers labels and Material Safety Data Sheets
One final word on safety, keep your work area clean
and free from clutter. This will greatly reduce the
chance of mishap while performing corrosion
CORROSION REMOVAL TOOLS AND
• Common Materials And Hand Tools
• Power Tools
• Alternate Removal Methods
COMMON MATERIALS AND HAND TOOLS
Materials and hand tools are classified as abrasive
mat/cloth/paper, metallic wools, wire brushes and scrapers.
ABRASIVES & SANDPAPERS: The selection and use of
any abrasive is determined by the type of metal and degree
of corrosion damage.
Flint - used due to low cost, dulls and wears out quickly,
normally a tan color
• Emery - mainly used for final polishing of metal due to it’s
fine mineral face
• Aluminum Oxide - used on metal surfaces, fast and last
longer than flint
• Silicon Carbide - sharp abrasive for wet or dry sanding on
paint and metal
Aluminum oxide works better on softer metals such as
aluminum and magnesium. Silicon is more effective on
harder metals like ferrous alloys. These materials should
be used primarily to remove mild to moderate corrosion
and for surface polishing after corrosion removal.
Don’t overlook the common pencil eraser. It can be used to
remove light corrosion from electrical contacts and printed
METALLIC WOOLS - Used to remove corrosion that is
not tightly adhered to a metal surface.
TYPE GRADE USE
Very Fine 000 Final Smoothing
Fine 0 Most Commonly Used
Medium 1 General Purpose
Medium Coarse 2 Rough Work
Coarse 3 Restoration
There are four major types of metallic wools:
Selecting the proper metallic wool looks easy at first glance.
There is another consideration that comes into play here.
You must know what type of metals you are working on.
Steel wool is used on ferrous metals; aluminum wool on
aluminum, aluminum alloys, magnesium and magnesium
alloys; copper wool on copper, bronze and brass; and
stainless steel wool on stainless steel. DO NOT use
metallic wools which are not galvanically compatible with
the metal surface being treated. Remember the chart on
compatible metals? Using the incorrect metallic wool will
only cause the corrosion to return in the near future.
When using metallic wool, always wear gloves and exercise
caution - wool fibers are sharp!
WIRE BRUSHES - Come in a variety of sizes, shapes and
are composed of different types of metal. The same rule
applies to wire brushes and metallic wool - use a metal
brush that is compatible with the metal you are treating.
Wire brushes are used to remove heavy corrosion deposits.
Thick, short bristles are used for rapid removal of heavy
deposits, finer brushes for lighter jobs. NEVER use a
brush with a bristle diameter greater than 0.010 inch
because it can damage the metal you are treating.
Never brush sideways across another brush mark, this can
cause unnecessary damage to the metal. After brushing a
soft metal, polish the surface with a fine abrasive paper to
remove brush marks.
SCRAPERS - Used primarily to remove heavy corrosion
deposits in corners and crevices that cannot be reached.
Due to gouges made by scrapers, the area will require
FILES - Same as scrapers.
POWER TOOLS - Remove watches, rings, button shirt
sleeves, tuck in loose clothing and always wear eye
protection. Ensure work area is properly ventilated and
wear a respirator. Be careful not to generate too much heat
on the metal surface. It can change the bonding of metals
making them vulnerable to intergranular corrosion.
Remember to protect nearby equipment and clean up the
entire area after work has been completed.
Corrosion products of copper are highly toxic. Proper safety
precautions must be taken to avoid inhalation or ingestion
during corrosion removal. Personnel should wash hands
before eating or smoking.
ALTERNATE REMOVAL METHODS
There are several other methods available to remove severe
corrosion. Workcenters in the 48IS will not perform these,
but I will mention them briefly.
ABRASIVE BLASTING - Corrosion is blasted away using
an abrasive driven by air pressure in excess of 125 pounds
per square inch. C-E equipment should never be allowed
to deteriorate to the point this is required. Steel antenna
support structures may require this treatment.
CHEMICAL REMOVAL - Application of acid-based or
rust conversion chemical. If left on equipment too long, it
may eat into the metal being treated. Should be
accomplished only by personnel with the proper training
CORROSION REMOVAL PROCEDURES
• Identify the extent of the corrosion and type of material to
be treated. Then determine if the work can be
accomplished at the workcenter level and the type of
corrosion removal tools needed.
• Survey the area for safety hazards and take the appropriate
• Cover up and protect all equipment and facilities that could
be damaged in the removal process.
• Gather all materials needed (to include protective
equipment and safety observer).
• Consult the applicable TO for correct removal procedures,
cautions or restrictions.
• Coordinate the work with Maintenance Control
• Closely inspect your work - 100% of the corrosion must be
• Use the appropriate materials to smooth the surface area
and prepare it for the protective coating.
• Remove all dust, particles and corrosion residue from the
treated equipment and surrounding area.
• Remove protective covers from other equipment and
inspect for contamination. Clean as necessary.
• Wipe down the area from which the corrosion was
removed with isopropyl alcohol.
• Properly dispose of used materials and put away tools.
• Return the equipment to operation and complete the
correct documentation in CAMS.
SAFETY - Many materials used for corrosion treatment are
both flammable and toxic. All products obtained through
normal supply channels will have a Material Safety Data
Sheet (MSDS). It is extremely important for you to follow
all safety precautions when using corrosion treatment
materials. Wear of respiratory protective devices, rubber
gloves, apron and eye protection is a good idea if you are
ever in doubt. Always wash hands thoroughly after
working with these products and always before eating,
drinking or smoking.
• POLYSULFIDE - Prevents moisture intrusion on
equipment exposed to outside elements.
• ZRC AEROSOL SPRAY - General use sealant.
• ROOM TEMPERATURE VULCANIZING (RTV) -
One of the most commonly used sealants.
DO NOT use an RTV containing Acetic Acid. This RTV
will cause serious corrosion on all metallic surfaces.
CORROSION PREVENTION COMPOUNDS (CPC):
CPCs are effective corrosion inhibitors, but never apply a
CPC unless authorized by a TO. Consult Maintenance
Support for assistance.
LUBRICANTS: Fill air gaps between moving parts and
forms protective barriers against dirt, moisture and foreign
materials thus inhibiting corrosion. Use only IAW the
VARNISHES: Provides a thin film that is resistant to
moisture and fungus.
CONFORMAL COATINGS: Special protective
compounds that conform to the contour of the material it is
applied to. Many circuit boards have conformal coatings.
Again, check the appropriate TO.
TOPCOATS: Paint. Always use the correct paint specified
in your equipment TO.
LACQUERS & ENAMELS: Good for indoor use only.
POLYURETHANE: Perhaps the most effective topcoat
made. Requires careful mixing and respiratory protection.
(No we’re not talking about the type you buy at the
As you can probably tell, there are many types of protective
films. Always check your equipment TOs as well as TO 1-
1-689 and 1-1-691. Your Unit Corrosion Control Monitor
in Maintenance Support can also offer assistance.
Once you have determined the appropriate protective film to
use, always follow manufacturer application instructions
and personal protective measures on the MSDS.
Remember corrosion prevention and control is everyone's
responsibility. Wherever there is a metal surface, there
could be corrosion.
IT’S TIME TO TAKE THE
P:\common\LS\LSK\corrosion training\corrosion test\
Follow the instructions and Good Luck.