GB/T 31931-2015
ActiveZinc or zinc alloy coating on steel sheets or strips—Determination of hexavalent chromium content—1,5-Diphenylcarbohydrazide (diphenylcarbazide) spectrophotometric method
钢板及钢带 锌及锌合金镀层中六价铬含量的测定 二苯碳酰二肼分光光度法
Application Summary AI generated
This standard specifies a spectrophotometric method using 1,5-diphenylcarbohydrazide to determine hexavalent chromium content in zinc or zinc alloy coatings on steel sheets or strips. It is applied in the metallurgy industry for quality control and environmental compliance testing of coated steel products, particularly to verify that hexavalent chromium levels meet regulatory limits for automotive, construction, and appliance manufacturing.
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