GB/T 41950-2022金属覆盖层钢铁上经过无六价铬处理的锌和锌合金电镀层国家标准
英文: Metallic coatings—Electroplated coatings of zinc and zinc alloys on iron or steel with supplementary Cr(Ⅵ)-free trea...
英文: Metallic coatings—Electroplated coatings of zinc and zinc alloys on iron or steel with supplementary Cr(Ⅵ)-free trea...