MIL DTL 81706B PDF

Touch-up and field repair use. TCP-HF contains a small amount of trivalent chrome which is not a carcinogen and is non-toxic. Disposal of hexavalent chrome is more expensive. Hexavalent chrome must be reduced to a trivalent state where the converted trivalent chrome content is precipitated and removed as a non-toxic substance. The wastewater is pH adjusted and sent to drain. Hexavalent chromate baths require frequent dumps which puts more demand on the treatment system.

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Type I: Addresses compositions containing hexavalent chromium. This film typically appears to be gold or brown in color, but in some cases may be optionally specified as having no color Having no color is described as "clear". Type II: Addresses compositions containing no hexavalent chromium. This film typically appears to have no color Having no color is described as "clear".

This is a relatively thick coating used as a final finish or pre-treatment to paint or powder coating. Class 3: Provides protection against corrosion where low electrical resistance is required. 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 bonding applications. Grades: Standard and Brushing for Aluminium and Aluminium Alloys provides requirements for the chromate conversion Coatings and chromate filming treatments for aluminium and aluminium alloys.

The ISO document entitled ISO , Aerospace process, Chemical conversion coating for aluminum alloys, General purpose describes the requirements for producing and testing the coatings, as well as giving information on technical requirements, quality assurance provisions, packaging and delivery. 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.

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.

This is a requirement due to their use on military aircraft. Class 1A: These chemical conversion coatings provide corrosion prevention on unpainted items and they improve adhesion of paint finish systems on aluminum and aluminum alloys. Coatings of this type may be used, for example, on tanks, tubing, and component structures where paint finishes are not required for interior surfaces, but are required for the exterior surfaces.

Class 3: These chemical conversion coatings provide a corrosion preventive film for electrical and electronic applications where lower resistant contacts, relative to class 1A coatings, and anodic coatings in accordance with MIL-A, are required.

Because Class 3 coatings are thinner they are more susceptible to corrosion than class 1A coatings. If it is required to paint areas surrounding electrical Class 3 coatings improve adhesion of paint systems on aluminum and aluminum alloy material.

Keep in mind that un-coated aluminum will naturally oxidize if left un-coated. If your goal is to ground to the surface of your aluminum part, then a thin class 3 coating keeps the oxide from building up and provides a better surface for grounding to be accomplished.

Also keep in mind that chemical conversion coating is not conductive, so to accomplish a good ground, sufficient pressure is required between the parts.

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Specialty Chemicals for Chromate Conversion

Type I: Addresses compositions containing hexavalent chromium. This film typically appears to be gold or brown in color, but in some cases may be optionally specified as having no color Having no color is described as "clear". Type II: Addresses compositions containing no hexavalent chromium. This film typically appears to have no color Having no color is described as "clear".

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MIL-DTL-81706B Chemical Conversion Materials for Al

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