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ASTM B 841

There is one class of zinc nickel coating denned as follows :

  • ASTM B841 Class 1 - Deposits having a minimum of 5 and maxi- mum 12 mass % nickel, the balance being zinc, There are five chromate conversion coating types that are defned as follows:
  • ASTM B841 Type A With colorless (blue bright) conversion coatings,
  • ASTM B841 Type B With yellow iridescent conversion coatings,
  • ASTM B841 Type C With bronze conversion coatings,
  • ASTM B841 Type D - With black chromate conversion coatings, and
  • ASTM B841 Type E- Any of the above plus organic topcoat

There are three grades according to thickness and are defined as follows:
ASTM B 841
Minimum Thickness, µm New ASTM Grade Old ASTM Grade
5 5 1
8 8 2
10 10 3





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