Chromate conversion coating resulting in the formation of a passivating film.
铬酸盐转化镀层导致形成钝化膜。只能使用三价铬。
Black conversion film with non-chromate was obtained on a cast aluminum alloy by chemical methods, and the anticorrosion properties of the film were evaluated by means of dropping test.
用无铬化学方法在铸铝合金表面制得黑色转化膜，利用点滴试验评价了膜的耐蚀性能。
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