通过在硼酸盐及含8-羟基喹啉的硼酸盐溶液中两步阳极氧化,可在碳钢表面形成一抗蚀层,XPS分析说明有表面络合物生成。极化曲线和交流阻抗测定表明抗蚀层主要作为相间缓蚀层阻滞了氧的阴极还原反应。铬酸盐封闭处理能增强抗蚀效果,若第二步阳极氧化时溶液中加有乙二胺等助剂,则封闭处理的效果更为明显,有望作为涂漆前预处理层或短期保护层。
A corrosion-resistant surface is obtained on steel by a two-step anodization Process in a borate solution to which 8-hydroxyquinoline(HQ) is added in the second step. Polarization and impedance measurements have been made in an aqueous chloride medium to characterize the samples and to assess the influence of the EDA additive and chromate post-treatment. It has been shown that the resulting layer acts mainly as an interphase inhibitor of oxygen cathodic reduction. Significant improvements in corrosion resistance of posttreated samples are found especially when EDA was added to HQ containing solution for anodic treatment. It is also verified from impedance data that Rp and R_f, which are relevant to the two eapaeitive loops in the diagram, are both significant for evaluating the protective effectiveness of the inhibitve layer.
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