Class 1A coatings give maximum corrosion protection with the highest electrical surface ASTM B , AMS G, AMS D and MIL-DTL-. Q. Problem: Mil-C [link is to free spec at Defense Logistics Agency, ] Class 1A vs Class 3. A certain customer has requested (i.e. engineering. The military specification referred to as MIL-DTL, "Military Specification, Chemical Class 1A: Provides maximum protection against corrosion, whether painted or unpainted. This is a relatively thick coating used as a final finish or.


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In many paint or adhesive applications, chromate is used as a base for superior bonding. Electrical resistance increases with the Class 1A heavier coating.

The chromate conversion process produces a thin, soft and gelatinous film when first applied. All chromate conversion coatings use chromic acid in the form of its soluble salts. Preparation and pre-cleaning prior to conversion processing are critical when achieving a uniform decorative finished product.

Chemical Films (Alodine)

This is a thin coating providing low contact resistance, and the coating weight is lower as is the corrosion resistance. There may be some advantages using this thinner film in mil c 5541 class 1a applications.

Standard and Brushing for Aluminium and Aluminium Alloys provides requirements for the chromate conversion Coatings and chromate filming treatments for aluminium and aluminium alloys.

Intended Usage[ edit ] The conversion coatings are intended for use on aluminum and aluminum alloy substrates that are not anodized.


They are used to repair anodized coatings on aluminum. They are designated as a post treatment to ion-vapor deposition IVD aluminum used on many military platforms as a cadmium alternative or galvanic corrosion inhibitor.

Metal Plating Services | Chromate Conversion Coating | Anodizing

Type I and II conversion coatings provide corrosion protection on unpainted items, as well as improve adhesion of paint finish systems on aluminum and aluminum alloys. The conversion coatings covered by this specification exceed most commercially available products.

Unless someone knows something I missed, basically all Class 1A approved chemicals will exhibit color after application. My thinking may be, possible engineering error?

MIL-DTLF - Alodine - Chemical Film - Chem film - MIL-C | Santa Clara Plating

I have a motto that I have kept and lived by for almost 25 years. We both share the same view that this could be an engineering spec.

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  • Difference between MIL-C-5541 Class 1a and MIL-DTL-5541 Type 2 Class 1a

It specifies a range of color. And one of the most common chemicals available for this class, i. If you are talking about "bleaching" with hot water, forget it.

Color wise, it may look good, but to the protective requirements of MIL-C, it will more than likely fail.

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