A-A-1346A
3.7.2.1.1 Chrome Plate Tests.
One measurement of the thickness of each electroplated coating shall be conducted in accordance with any of the following, as appropriate, methods:
ASTM B 487: Standard Method for Measurement of metal and oxide coating thickness by microscopical examination of a cross section.
ASTM B 499: Standard Test Method for Measurement of coating thickness by the magnetic method: nonmagnetic coatings of magnetic basis metals.
ASTM B 504: Standard Method for Measurement of thickness of metallic coatings by the coulometric method.
ASTM B 530: Standard Test Method for Measurement of coating thickness by the magnetic method: electrodeposited nickel coatings on magnetic and nonmagnetic substrates.
ASTM B 568: Standard Test Method for Measurement of coating thickness by x-ray spectrometry.
ASTM B 748: Standard Method for Measurement of thickness of metallic coatings by measurement of cross section with a scanning electron microscope.
ASTM A 754: Standard Test Method for Coating thickness by x-ray fluorescence.
Visible contact marks resulting from electroplating operations shall be confined to the interior of the wrenching and drive openings. Surfaces of the electroplated tool shall be adherent, smooth, continuous, and free of visible defects, such as blisters, pits, roughness, cracks, and uncoated areas, Surfaces shall not be stained or discolored and shall have a bright appearance.
The electroplated tool shall be clean and free of damage. The tool shall be tested for adhesion of electroplated materials in accordance with ASTM B571, Standard Test Methods for Adhesion of Metallic Coatings, by one of the following methods: Grind-Saw, Push, File, or Burnishing.
3.7.2.2 Alternative Coatings. Alternate coatings maybe used in lieu of nickel - chromium and shall be subjected to the Alternative Coating Test as specified below.
3.7.2.2.1 Alternative Coating Test.
The test consists of an adhesion, abrasion, and corrosion test specified below:
Test Preparation. The quantity and condition of the wrenches used for the following testing shall be per the manufacturer’s standard practice or as mutually agreed to by the manufacturer and the General Services Administration.
Adhesion Test. Sample wrenches shall pass the file or grind-saw test of ASTM B 571, Standard practice for qualitative adhesion testing of metallic coatings.
Abrasion Test. Sample wrenches shall have no base material exposed after being subjecting to 100 liters of falling sand per ASTM D 968 Method A, Standard Test Method for abrasion resistance of organic coatings by falling abrasive.
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