Zinc or zinc alloy coating on steel sheets or strips—Determination of hexavalent chromium content—1,5-Diphenylcarbohydrazide(diphenylcarbazide) spectrophotometric method
全国钢标准化技术委员会(SAC/TC 183)
本标准规定了二苯碳酰二肼分光光度法测定六价铬含量的方法。
本标准适用于钢板及钢带表面锌及锌合金镀层，其中包括镀纯锌、锌铁合金、锌铝和铝锌合金表面六价铬含量的测定。测定范围：2 μg/g～100 μg/g或0.020 μg/cm2 ～10 μg/cm2。
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