Zinc Platings

Plating Guidelines

Black Nitride || Cadmium Platings || Dry Film Lubricants || Electro-Tin/Solderable Platings || Nickel Platings || Passivation of Stainless Steel || Zinc Platings

ZINC PLUS CLEAR HEXAVALENT FREE CHROMATE – PART SUFFIX ZI

Applicable Industry Spec: ASTM B633, SC1, Type III

  • Scope – This includes electrodeposited zinc coatings as applied to steel, copper, brass, and bronze parts to protect them from corrosion. Steel parts requiring embrittlement relief after plating are baked according to industry standards.
  • Plating Thickness – The zinc plating shall be a minimum thickness of .0002 inch (5 µm) on all significant surfaces. Surfaces on which the specified thickness of deposit cannot readily be controlled, such as threads, holes, deep recesses, bases of angles, and similar areas, are exempt from the thickness requirements.
  • Supplementary Finish – Parts shall have a clear hexavalent free chromate conversion coating applied.
  • Testing – The parts shall be capable of passing 12 hour salt spray test per ASTM B117 with no white corrosion products. White corrosion products on external edges or corners shall not be cause for rejection.
    Red corrosion products on surfaces which the specified thickness of deposit cannot readily be controlled, such as threads, holes, deep recesses, bases of angles, and similar areas, shall not be cause for rejection.

ZINC PLUS YELLOW HEXAVALENT FREE CHROMATE – PART SUFFIX ZC

Applicable Industry Spec: ASTM B633, SC1, Type II

  • Scope – This specification covers electrodeposited zinc coatings as applied to steel, copper, brass, and bronze parts to protect them from corrosion. Steel parts requiring embrittlement relief after plating are baked according to industry standards.
  • Plating Thickness – The zinc plating shall be a minimum thickness of .0002 inch (5 µm) on all significant surfaces. Surfaces on which the specified thickness of deposit cannot readily be controlled, such as threads, holes, deep recesses, bases of angles, and similar areas, are exempt from the thickness requirements.
  • Supplementary Finish – Parts shall have an iridescent yellow hex-free chromate conversion coating applied. The parts shall have a yellow/gold color.
  • Testing – The parts shall be capable of passing a salt spray test per ASTM B117. Minimum salt spray requirements are 96 hours with no white corrosion products and 120 hours with no red rust on significant surfaces.
    White corrosion products on external edges or corners shall not be cause for rejection.
    Red corrosion products on surfaces which the specified thickness of deposit cannot readily be controlled, such as threads, holes, deep recesses, bases of angles, and similar areas, shall not be cause for rejection.

ZINC PLUS CLEAR TRIVALENT CHROMATE PLUS SEALANT/LUBRICANT – PART SUFFIX LZ

Applicable Industry Spec: ASTM B633, SC1, Type III plus a lubricated topcoat

  • Scope – This specification covers electrodeposited zinc coatings as applied to steel, copper, brass, and bronze parts to protect them from corrosion. Steel parts requiring embrittlement relief after plating are baked according to industry standards and provide lubricity.
  • Plating Thickness – The zinc plating shall be a minimum thickness of .0002 inch (5 µm) on all significant surfaces. Surfaces on which the specified thickness of deposit cannot readily be controlled, such as threads, holes, deep recesses, bases of angles, and similar areas, are exempt from the thickness requirements.
  • Supplementary Finish – Parts shall have a trivalent chromate conversion coating applied and then leached back to a silver – white color with a combination leachant – sealant. The leachant – sealant shall have an integral lubricant.
  • Testing – The parts shall be capable of passing a salt spray test per ASTM B117 or SAE/USCAR-1 after being baked at 120° C for 4 hours. Minimum times are 72 hours with no white corrosion products and 168 hours with no red corrosion products.
    White corrosion products on external edges or corners shall not be cause for rejection.
    Red corrosion products on surfaces which the specified thickness of deposit cannot readily be controlled, such as threads, holes, deep recesses, bases of angles, and similar areas, shall not be cause for rejection.
    The parts shall be capable of passing the appropriate torque / clamping force requirements specified in Ford Spec WZ100 or as required by special customer specifications.

ZINC PLUS OTHER CHROMATE CONVERSION COATINGS – PART SUFFIX ZB & BZ

ZB Applicable Industry Spec: ASTM B633, SC1 (5µm), Type III, Black
BZ Applicable Industry Spec: ASTM B633, SC1 (5µm), Type III, Blue

  • Scope Other chromate conversion coatings such as black, blue and olive color are available on special order. These colored chromate coatings offer various degrees of corrosion resistance.

HAZARDOUS SUBSTANCE RESTRICTIONS FOR ALL ZINC PLATING

  • PennEngineering uses the detection methods defined in the IEC-62321-7-1:2015 to measure hexavalent chrome in the chromate conversion (passivation) layer of our zinc-chromate plated parts to assure they are not hexavalent chromium based as determined by IEC-62321-7-1:2015 and other consensus standards. Concentrations of lead, mercury, poly-brominated Biphenyls (PBB) and polybrominated diphenyl ethers (PBDE), in any as deposited homogenous material must be less than 1000 PPM or 0.1%. The concentration of cadmium must be less than 100 PPM or 0.01%.