| 简介 |
PROBLEM TO BE SOLVED : To stably form a chromium-free chemical conversion film having excellent corrosion resistance and uniform luster appearance regardless of a shape of a plating member and execution of heat treatment after plating.
SOLUTION : A zinc plating member and zinc alloy plating member are subjected to immersion treatment by an acidic reaction type chemical conversion treatment liquid containing a vanadium group compound, a rare earth ion, a nitrite ion, optionally one metal compound including one or more selected from Fe, Mg, Ca, Ni, Co, Zn, Y, La, Mo, W, Ti, Al, Zr, Mn, and optionally a silicon compound. Furthermore, optionally a coating film including inorganic, organic, or organic and inorganic compound or a multilayer coating film thereof is formed on a protective coating film after the object to be treated is cleaned by water.
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