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        Title:  | 
        CHEMICAL CONVERSION COATINGSON ALUMINUM AND ALUMINUM ALLOYS                                                         | 
      
      
        Number:  | 
        MIL-DTL-5541              | 
      
      
        Revision:  | 
        F                         | 
      
      
        Scope:  | 
        This specification covers chemical conversion coatings formed by the reaction of chemical conversion materials with the surfaces of aluminum and aluminum alloys. | 
      
      
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              Classification:  | 
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                Types                 | 
                The chemical conversion coatings are of the following types | 
               
              
              
                Classes               | 
                The materials, which form protective coatings by chemical reaction with aluminum and aluminum alloys, are of the following classes. | 
               
              
           
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              | Details  | 
              Description | 
              Can Do  | 
             
            
              
                | Type I                    | 
                Compositions containing hexavalent chromium | 
                Yes | 
               
              
              
                | Type II                   | 
                Compositions containing no hexavalent chromium | 
                Yes | 
               
              
              
                | Class 1A                  | 
                For maximum protection against corrosion, painted or unpainted. | 
                Yes | 
               
              
              
                | Class 3                   | 
                For protection against corrosion where low electrical resistance is required. | 
                Yes | 
               
              
           
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