In the international standard classification, gb5270 involves: Surface treatment and coating.
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, gb5270
GB 5270-1985 Metal coatings on metal substrates (electrodeposited and chemically deposited)
GB/T 5270-1985 Metallic coatings on metallic substrates--Electrodeposited and chemically deposited coatings--Review of methods available for testing adhesion
GB/T 5270-2005 Metallic coatings on metallic substrates-Electrodeposited and chemically deposited coatings-Review of methods available for testing adhesion