Trivalent Chromium Electroplating Specification 1 Scope This standard specifies the test methods for trivalent chromium electroplating solution and the technical requirements for trivalent chromium plating. It also specifies the inspection methods for trivalent chromium and verification methods for hexavalent chromium in trivalent chromium electroplating solution. This standard is applicable to trivalent chromium electroplating chromium composite coating for decorative protective copper+nickel+ chromium and nickel+chromium electroplating. Note: considering environmental factors, hexavalent chromium may cause high dense pollution to the environment. Human being or animals are very difficult to metabolize once they absorb hexavalent chromium. While the impacts form trivalent chromium is not as serious as hexavalent chromium and the process sludge is less. Trivalent chromium electroplating instead of hexavalent chromium electroplating may reduce the harm to the environment. 2 Normative References The following documents contain provisions which, through reference in this standard, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties to agreements substrate on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies. GB/T 3138 Terminology for metallic coating, chemical treatment and related process GB/T 4955 Metallic coatings -- Measurement of coating thickness -- Bolometric method by anodic dissolution (GB/T 4955-2005, ISO 2177: 2003, IDT) GB/T 5270 Metallic coatings on metallic substrates?Electrodeposited and chemically deposited coatings?Revies of methods available for testing adhesion (GB/T 5270-2005, ISO 2819: 1980, IDT) GB/T 6461 Methods for corrosion testing of metallic and other inorganic coatings on metallic substrates--Rating of test specimens and manufactured articles subjected to corrosion tests (GB/T 6461—2002, ISO 10289:1999,IDT) GB/T 7466 Water quality; Determination of total chromium GB/T 9797 Metallic coatings-Electroplated coatings of nickel plus chromium and of copper plus nickel plus chromium(GB/T 9797—2005,ISO 1456:2003,IDT) GB/T 12334 Metallic and other inorganic coatings--Definitions and conventions concerning the measurement of thickness(GB/T 12334—2001,ISO 2064:1996,IDT) GB/T 12600 Metallic coatings—Electroplated coatings of nickel plus chromium on plastics materials(GB/T 12600—2005,ISO 4525:2003,IDT)
