BS EN ISO 3613:2010

1   Scope This International Standard specifies methods for the determination of

       —  the presence of colourless chromate conversion coatings, 
   
   
     
       —  the presence of hexavalent chromium in colourless and coloured coatings on zinc or cadmium or aluminium-zinc (mass fraction of aluminium: 55 %, within a range of 54 % to 56 % mass fraction) and zinc-aluminium (mass fraction of aluminium: 5 %) alloys, 
   
   
     
       —  the total chromium content per unit area on zinc and cadmium, 
   
   
     
       —  the mass per unit area of both colourless and coloured coatings, 
   
   
     
       —  the satisfactory adhesion of chromate conversion coatings, and 
   
   
     
       —  the quality of chromate coatings. 
   
 

These methods are applicable

       —  to colourless and coloured chromate conversion coatings containing trivalent and hexavalent chromium in varying proportions and produced by either chemical or electrochemical processes, and 
   
   
     
       —  only to chromate coatings that are free from any supplementary coatings, such as oil, water or solvent-based polymer...