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Normas ASTM – AENOR
ASTM B767-88(1994)

ASTM B767-88(1994)

Standard Guide for Determining Mass Per Unit Area of Electrodeposited and Related Coatings by Gravimetric and Other Chemical Analysis Procedures

Fecha:
2017-08-16 /Historical
Superseeded by:
Scope:

1.1 This guide outlines a general method for determining the mass per unit area of electrodeposited, electroless, mechanically-deposited, vacuum-deposited, anodicoxide, and chemical conversion coatings by gravimetric and other chemical analysis procedures.

1.2 This guide determines the average mass per unit area over a measured area.

1.3 The stripping methods cited are described in specifications or in the open literature or have been used routinely by at least one laboratory.

1.4 The procedures outlined can be used for many coating-substrate combinations. They cannot be used where the coating cannot be separated from the substrate by chemical or physical means as would be the case if white brass were plated with yellow brass.

1.5 In principle, these procedures can be used to measure very thin coatings or to measure coatings over small areas, but not thin coatings over small areas. The limits depend on the required accuracy. For example, 2.5 mg/cm of coating might require 2.5 mg of coating covering 1 cm , but 0.1 mg/cm of coating would require 25 cm to obtain 2.5 mg of coating.

1.6 This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Keywords:
acceptance criteria/testing; aluminum coatings; average mass per unit area; brass-electrodeposition; cadmium-metallic coatings; chemical analysis; chromate coatings; chromium-coatings; coatings-aluminum; coatings-anodic; coatings-chromate; coatings-mechanically deposited; coatings-phosphate; coating thickness; copper-electrodeposited coatings; density-metallic coatings; gold-electrodeposited coating; gravimetric method; lead-tin; linear changes/linearity; mass-mass per unit area; micrometer; microroughness; microscopic examination-metallic/inorganic coatings; nickel-electrodeposition; planimetric procedure; silver-electrodeposition; terne plate; tin-electrodeposited coatings; tin-lead; vernier caliper; weight; zinc alloys-electrodeposited coatings; mass per unit area-electrodeposited/related coatings, by; gravimetric/other chemical analysis procedures, guide
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