Compound Metal Coating Inc.

Industry Vetted Professionals

Compound Metal Coatings Inc. is committed to providing high standard finishing services that satisfy customer expectations and requirements in a timely, cost effective and environmentally responsible manner.

Our operations are in compliance with the following industry specifications


  • ASTM B-733
  • ASTM B-607
  • Mil-C-26074E (AMS-26074): a military specification, approved for use by all Departments and Agencies of the Department of Defense
  • AMS 2405
  • AMS 2404
  • AMS 2399


  • Ford: ESW-M1P65A
  • Chrysler: PS-5009
  • GM
  • Aircraft companies: Boeing, Pratt Whitney
  • Machinery equipment companies: Caterpillar, Applied Materials

SPECIFICATION REQUIREMENTS FOR MIL-C-26074E CLASSIFICATION Nickel coatings shall be classified in accordance with thermal treatment applied subsequent to plating:

  • Class 1: As plated, no subsequent heat treatment: a bake for hydrogen embrittlement relief is not considered a heat treatment.

  • Class 2: Heat treated to obtain required hardness. May be used on all metals not affected by heating to 500F and above. Coatings shall have a minimum hardness of 800 knoop or equivalent vickers when tested. Class 2 coatings on steel parts that have a hardness of 40 RCH or above are required to be tested without cracking of fracture. The desired hardness can be achieved by heating the part (see within 4 hours arter coating).

  • Class 3: Aluminum alloys non heat-treatable, and beryllium alloys processed to improve adhesion of the nickel deposit. Non heat-treatable aluminum parts shall be heated for 1 to 1.5 hours at 375F to improve adhesion of nickel deposit.

  • Class 4: Aluminum alloys, heat-treatable, processed to improve adhesion of the nickel deposit. Heat-treatable aluminum alloys shall be heated between 240F to 260F for 1 to 1.5 hours to improve adhesion of nickel deposit.

NOTE: These alloy types and grades may undergo microstructural changes when heated to 375F. Nickel coatings have the following grades:

  • Grade A – O.0010-inch minimum thickness.
  • Grade B – 0.0005-inch minimum thickness.
  • Grade C – 0.0015-inch minimum thickness.

ASTM B-733 A standard specification for autocatalytic nickel-phosphorus coatings on metals:

  • Type 1: No requirement for phosphorus
  • Type 2: 1-3% P low phosphorus
  • Type 3: 2-4% P low-med. phosphorus
  • Type 4: 5-9% P medium phosphorus
  • Type 5: 10 % + P high phosphorus

QUALITY Requirements for ASTM B-733:

  • Appearance;
  • Thickness – service condition;
  • Adhesion – testing method ASTM B571;
  • Porosity;
  • Composition – alloy type;
  • Microhardness – ASTM B578;
  • Wear;
  • Hydrogen embrittlement evaluation ASTM F519;
  • and Corrosion resistance.


  • ASTM B117: A method of salt spray (fog) testing.
  • ASTM B487: Measurement of metal and oxide coatings thickness by microscopical examination of a cross section
  • ASTM B499: Standard test method for measurement of coating thickness by the magnetic method. Non magnetic coatings on magnetic base metals.
  • ASTM B567: A method for measurement of coating thickness by the beta backscatter method.
  • ASTM B568: X-Ray spectrometry
  • ASTM B571: A test method for adhesion of metallic coatings.
  • ASTM B578: A test method for microhardness of electroplated coatings.
  • ASTM E18: Rockwell hardness and rockwell superficial hardness of metallic materials.
  • ASTM E384: A test method for microhardness of materials.
  • ASTM F519: Mechanical hydrogen embrittlement testing of plating processes and aircraft maintenance chemicals.
Compound Metal Coatings Inc.

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