
Zinc or zinc alloy coating on steel sheets or strips—Determination of hexavalent chromium content—1,5-Diphenylcarbohydrazide (diphenylcarbazide) spectrophotometric method
NORMA vydána dne 11.9.2015
Designation standards: GB/T 31931-2015
Publication date standards: 11.9.2015
Country: Chinese technical standard
Kategorie: Technické normy GB