Clear Chromate [MIL-DTL-5541]

Clear Chromate refers to a chemical conversion coating specified by MIL-DTL-5541 for aluminum and aluminum alloys. Let’s break it down:

Types:

• Type 1: Contains hexavalent chromium. The resulting film may appear gold or brown, but it can also be specified as having no color (referred to as “clear”).
  
  
• Type 2: Contains no hexavalent chromium. The film typically has no color (also described as “clear”).

Classes:

• Class 1A: Provides maximum corrosion protection, suitable as a final finish or pre-treatment for paint or powder coating.
  
  
• Class 3: Offers corrosion protection with low electrical resistance, often used in bonding applications.

In summary, clear chromate coatings enhance corrosion resistance and serve as a basis for subsequent paint applications. They find use in both military/defense and commercial applications