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Protective Coating 1
- Thread starter roozle
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1
- #2
roozle..
I have never heard of the materials You indicated.
The FAA does NOT specify corrosion protection as You were expecting: it is part of the damage protection scheme for structures and systems... and interiors MUST not contribute to structural or systems corrosion. This includes metallic protection schemes and use of non-corrosive non-metallic materials and other chemicals materials [such as fire-proofing impregnants]. These materials must NOT out-gas, cross-link or otherwise transfer corrosive chemistry [clorine, salts, etc]; or otherwise don't encourage corrosive behavior, such as trapping moisture against metal parts [IE: moisture-proof insulation].
Typically "Alodine" [AMS-C-5541] and Epoxy Primer [MIL-PRF-23377, or variations of this primer] are used for aluminum protection.
All non-metallic materials have to be checked for moisture retention, out-gas constiuents, contact chemistry [IE: materials touching sometime cross-link, like rubberbands against certain paints], abrasiveness, fire resistance... etc. This includes "new" and aged" versions of the same materials. Regards, Wil Taylor
I have never heard of the materials You indicated.
The FAA does NOT specify corrosion protection as You were expecting: it is part of the damage protection scheme for structures and systems... and interiors MUST not contribute to structural or systems corrosion. This includes metallic protection schemes and use of non-corrosive non-metallic materials and other chemicals materials [such as fire-proofing impregnants]. These materials must NOT out-gas, cross-link or otherwise transfer corrosive chemistry [clorine, salts, etc]; or otherwise don't encourage corrosive behavior, such as trapping moisture against metal parts [IE: moisture-proof insulation].
Typically "Alodine" [AMS-C-5541] and Epoxy Primer [MIL-PRF-23377, or variations of this primer] are used for aluminum protection.
All non-metallic materials have to be checked for moisture retention, out-gas constiuents, contact chemistry [IE: materials touching sometime cross-link, like rubberbands against certain paints], abrasiveness, fire resistance... etc. This includes "new" and aged" versions of the same materials. Regards, Wil Taylor
- Thread starter
- #4
roozle...
It's hard at best, impossible at worst, to diagnose coating-systems without hands-on inspections.
The surface is "yellow" could mean a host of things, based on Your perspective.
a. If this is an aluminum surface that appears to "shimmer" with a "golden-yellow" reflection-tone, it could be alodined or chromic acid anodized... or possibly phosphoric-acid anodized if viewed at an angle.
b. If this is a painted coating it could be an epoxy, polyurethane or enamel primer [in that order] with yellow corrosion-protective pigments... or if the assy is adhesive-bonded, it could be an adhesion promoting epoxy primer.
It could also have a + b on it.
More specific deatails are important. Regards, Wil Taylor
It's hard at best, impossible at worst, to diagnose coating-systems without hands-on inspections.
The surface is "yellow" could mean a host of things, based on Your perspective.
a. If this is an aluminum surface that appears to "shimmer" with a "golden-yellow" reflection-tone, it could be alodined or chromic acid anodized... or possibly phosphoric-acid anodized if viewed at an angle.
b. If this is a painted coating it could be an epoxy, polyurethane or enamel primer [in that order] with yellow corrosion-protective pigments... or if the assy is adhesive-bonded, it could be an adhesion promoting epoxy primer.
It could also have a + b on it.
More specific deatails are important. Regards, Wil Taylor
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