ZINC OR ZINC-BASED ALLOY COMPOSITE PLATED METALLIC MATERIAL HAVING HIGH CORROSION RESISTANCE

摘要

PURPOSE:To improve corrosion resistance, especially corrosion resistance after coating by incorporating compds. of Al and/or Cr and one or more among Mo, W, Be, etc., into a Zn or Zn-based alloy plating layer formed by electroplating. CONSTITUTION:Compds. of Al and/or Cr and one or more among Mo, W, Be, Ca, Mg, Sr, Ba, Ti, Zr, La and Y are incorporated into a Zn or Zn-based alloy plating layer formed by electroplating. The pref. total amt. of the compds. of Al and/or Cr is 0.05-10wt.% (expressed in terms of Al and/or Cr) and that of the compds. of one or more among Mo, W, Be, etc., is 0.002-5wt.% (expressed in terms of the metals).