TASK 70-43-19-640-005
1 . General.
CAUTION:
DO NOT APPLY THIS PROCESS TO ALUMINUM OR ALUMINUM ALLOY HARDWARE OR ASSEMBLIES, UNLESS APPROVED BY GEAE ENGINEERING.
A.This solid-film coating is a dry molybdenum disulfide lubricant dispersed in a high-temperature synthetic resin binder C02-027.   The coating forms a heat-resistant lubricating surface on mating parts to prevent galling or seizing. The material is applied by brushing or spraying.
2 . Equipment and Material.
Subtask 70-43-19-640-054
A.For spray applications, following manufacturer's recommendation, use an external atomizing-type spray gun.
B.Materials:
 
Description
Consumable Code
Use
 
Lubricant, Solid Film (Heat Cured)
C02-027  
Lubricant
 
Solvent, General
C04-001  
Cleaning, Quality Check
 
Solvent, General
C04-003  
Cleaning, Quality Check
 
Methyl-Ethyl-Ketone (ASTM D 740)*
C04-001  
Reducer
 
Industrial Toluene*
C04-036  
Reducer
 
Tape, Paint Adhesion Testing
C10-189  
Quality Check
 
Tape, Transparent Film (A-A-113 Type 1 Class A)
C10-251  
Quality Check
 
NOTE:
*The use of alternative dilution solvents is not permitted.
3 . Procedure.
Subtask 70-43-19-640-051
A.Prepare the surface and apply the solid-film lubricant as follows:
WARNING:
CLEANING SOLVENTS ARE TOXIC AND HIGHLY FLAMMABLE. USE IN A WELL-VENTILATED AREA, AND TAKE PRECAUTIONS AGAINST FIRE.
CAUTION:
DO NOT TOUCH CLEANED AREA WITH BARE HANDS OR EXPOSE IT TO ANY SOURCE OF CONTAMINATION. IF THE COATING IS NOT APPLIED WITHIN 15 MINUTES OF CLEANING, THE PARTS MUST BE RECLEANED.
(1)Clean the surface to be coated by wiping with clean cheesecloth moistened with general solvent C04-001   or C04-003.   Repeat, if necessary, until the surface of the cloth remains clean. Let the cleaned surface air-dry, or wipe it dry with clean, dry cheesecloth.
Subtask 70-43-19-640-055
(2)Apply the coating with one of the two methods:
(a)Spray application:
1Open the container of solid-film lubricant C02-027   and stir contents until thoroughly mixed. Pour out a quantity sufficient for about one hour of use into a clean container. Reseal the original container.
CAUTION:
FAILURE TO THOROUGHLY MIX THE LUBRICANT OR ALLOWING IT TO SETTLE OUT WILL EACH RESULT IN AN UNACCEPTABLE COATING. IT IS RECOMMENDED THAT AN AGITATOR IS USED FOR PRESSURIZED FEED SYSTEMS.
2Mix these ingredients (by weight):
Solid Film Lubricant C02-027:   36.4% ± 1.3%
Methyl-Ethyl-Ketone (ASTM D 740) C04-001:   31.8% ± 1.3%
Industrial Toluene C04-036:   31.8% ± 1.3%
Mixing instructions: Mix the lubricant in a pail for a minimum of 15 minutes. Check the bottom of the pail for settling. Add the lubricant to a clean mixing vessel. While mixing, add the Methyl-Ethyl-Ketone C04-001.   Continue to mix for 5-10 minutes. While mixing, add the toluene C04-036.   Continue to mix for 15-20 minutes.
3Apply the solid-film lubricant to the cleaned surfaces by spraying with an external, atomizing-type spray gun (refer to Step 2.(A) in Subtask 70-43-19-640-054). The coating must be uniform, thin, and free from lumps, streaks, and foreign material. Stir the lubricant as often as possible, using a wide paddle. Optimum condition is obtained by continuous stirring.
NOTE:
Containers of lubricant that do not have close-fitting lids to exclude air must be discarded. The lubricant in the working container must not be put back into the original container.
(b)Brush application:
1Open the container of solid-film lubricant C02-027   and stir contents until thoroughly mixed. Pour out a quantity sufficient for about one hour's use into a clean container. Reseal the original container.
NOTE:
Concentrated product can be diluted per mixing instructions given in Step 3.A.(2)(a)2 in Subtask 70-43-19-640-055 for special brush applications requiring a final thickness of 0.001 inch (0.03 mm) or less. While applying the diluted lubricant, it must be kept agitated to avoid separation.
CAUTION:
FAILURE TO THOROUGHLY MIX THE LUBRICANT OR ALLOWING IT TO SETTLE OUT WILL EACH RESULT IN AN UNACCEPTABLE COATING.
2Apply the solid-film lubricant to the cleaned surfaces with a camel's hair brush. The coating must be uniform, thin, and free from lumps, streaks, and foreign material. Stir the lubricant as often as possible, using a wide paddle. Optimum condition is obtained by continuous stirring.
NOTE:
Containers of lubricant that do not have close-fitting lids to exclude air must be discarded. The lubricant in the working container must not be put back into the original container.
Subtask 70-43-19-640-056
(3)Let coated surfaces air-dry for 15 minutes minimum until wet appearance disappears, or until coating is dull in appearance. Heat below 175°F (79°C) maximum may be used to accelerate drying.
(4)Check thickness and continuity of coating. No metal must be visible through the coating. If necessary, to complete coverage or to increase thickness, re-coat and air-dry as described in Step 3.A.(3) in Subtask 70-43-19-640-056, avoiding overlapping previously coated areas. Refer to Step 4.A.(5) in Subtask 70-43-19-640-052.
(5)Bake the air-dried coated parts in a preheated oven at 375 to 425°F (191 to 218°C) for 60 to 90 minutes (part temperature).
NOTE:
For SPM 70-43-19 APPLICATION OF SOLID-FILM LUBRICANT - C02-027 TASK 70-43-19-640-005 OP3.A.(5) describes: bake the air-dried coated parts in a preheated oven at 375 to 425F (191 to 218C) for 60 to 90 minutes (part temperature), air circulating oven can be used. Please be sure that the requirements given is applied (preheated oven at 375 to 425F (191 to 218C) for 60 to 90 minutes) and the furnace calibration is done each year. Baking process in this procedure does not require thermal couple usage on part. Refer to Case #01925855.
CAUTION:
DO NOT LET WATER, OIL, SOLVENTS, OR ANY OTHER CONTAMINANTS COME IN CONTACT WITH THE COATED SURFACE BEFORE BAKING.
(6)Let the parts air-cool.
4 . Quality Provisions.
Subtask 70-43-19-640-052
A.Material must be used before its shelf-life period is exceeded. The coating, after it is oven cured, must have the following characteristics:
(1)The cured coating must appear uniform in color and must be smooth, free from any cracks, scratches, pinholes, blisters, bubbles, runs, sags, or other surface imperfections.
(2)The coating homogeneity must be determined by visual appearance of the coating after thermal curing. Properly mixed coating, after it is cured, must appear dark grey to black with a dull finish. A green cast or glossy appearance of the cured coating is not acceptable. Over cured parts (excessive time or temperature) may exhibit a brown cast with yellow spots of molybdenum oxide and must be removed and re-coated. Any other coloration or surface texture than that specified must not be acceptable.
(3)The coating must exhibit complete coverage in the areas specified in related repair instructions. Coating on areas other than those specified, must not be permitted. It is permitted to apply and re-cure additional coating to areas with inadequate coverage, up to a maximum of two additional times, after curing the initial coating application. The adhesion test requirements in Step 4.A.(5) Subtask 70-43-19-640-052 must be met after the final curing of the coating has been completed.
WARNING:
GENERAL SOLVENTS ARE TOXIC AND EXTREMELY FLAMMABLE. AVOID PROLONGED BREATHING OF VAPOR AND CONTACT WITH THE SKIN. KEEP AWAY FROM SPARKS OR FLAME.
(4)The cured coating on the part or test sample must be wiped for one minute with a clean white cloth or cotton swab saturated with general solvent C04-001   or C04-003.   Coating dissolution during wiping or removal that exposes the underlying material is not permitted. Unacceptable coatings must be removed and re-coated.
(5)After parts have been tested previously to meet cure test requirement, adhesion of the cured coating must be determined by placing a strip of paint adhesion testing tape C10-189   or transparent film tape C10-251   firmly on either the cured coated part or an adhesion sample, and removing it with a quick continuous motion. Adhesion and cure test samples in Step 4.A.(4) Subtask 70-43-19-640-052 must be of a material having a similar composition, surface preparation, and thermal spray coatings as the part being coated. The coating must be continuously bonded to the surface and must not exhibit any spallation or lifting. A light deposit of powdery material clinging to the tape must not be cause for rejection.
5 . Handling.
Subtask 70-43-19-640-053
A.Coated parts shall be handled in such a way that no chipping, scratching or other damage can occur.