ASTM B177/B177M-11(2021)

Annotation of standard text ASTM B177/B177M-11(2021) :

This guide provides information on the deposition of engineering chromium by electroplating. This is sometimes called ""functional"" or ""hard"" chromium and is usually applied directly to the basis metal and is usually thicker than decorative deposits. This guide is not intended as a standardized procedure, but as a guide for obtaining smooth, adherent coatings of a desired thickness while retaining the required physical and mechanical properties of the base metals. Engineering chromium may be plated directly to the surface of a commonly used engineering metals such as aluminum, nickel alloys, cast iron, steels, copper, copper alloys, and titanium. Substrate requirements including smoothness, fatigue, high-strength steel stress relief, and oxidation are specified. The procedure and requirements for the following are detailed: (1) racking, including rack and anode designs, (2) cleaning, (3) deoxidizing and etching such as anodic etching in chromic acid solution, in plating solution, and in sulfuric acid solution, and slight etching by acid immersion, (4) chromium electroplating process, (5) treatment of chromium coatings such as baking to avoid hydrogen embrittlement, and mechanical finishing by grinding, grinding and honing, or lapping, (6) repair of chromium electrodeposits on steel substrates, and (7) test methods such as thickness determination, hardness test, and adhesion test.


Keywords:
chromium electroplating,, ICS Number Code 25.220.99 (Other treatments and coatings)