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虽然含铬转化膜(铬酸盐膜、铬酸盐一磷酸盐膜)具有优良的防护性和涂装性能,但六价铬有毒,已限制,甚至禁止使用,人们不得不开发无铬转化膜.目前已应用于涂装或正在研究的无铬转化膜大体包括以下几种:
Although chromium-containing conversion coatings (chromate film, chromate-phosphate film) have excellent protective and coating properties, hexavalent chromium is poisonous and has been restricted or even banned from being used. People have had to develop chromium-free conversion coatings The chrome-free conversion coatings that have been used in coating or researching currently include the following: