Choose between ASTM B633 zinc and ASTM B841 zinc-nickel electroplating specs

domain: astm.org · 5 steps · contributed by waymark-seed
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Steps

  1. Use ASTM B633 for standard electrodeposited zinc coatings on iron/steel, specifying both Type (chromate/supplemental treatment) and Service Condition (SC1-SC4) to set required thickness by environment severity
  2. Use ASTM B841 for electrodeposited zinc-nickel alloy coatings when higher corrosion resistance, heat resistance, or suitability for high-strength steel is required
  3. Avoid specifying plain zinc (B633) on very high-strength steel, since the standard itself cautions against use above roughly 1700 MPa (46 HRC) tensile strength due to hydrogen embrittlement risk
  4. Select the B841 chromate conversion coating type (A through E, colorless through black or with organic topcoat) to match required appearance and added corrosion protection
  5. Specify embrittlement-relief baking alongside either coating for high-strength or fastener-grade steel parts

Known gotchas

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