目前,未见pH值对锈层复合转化膜层结构和性能影响的研究.采用不同pH值的单宁酸-磷酸复合转化液对Q235钢锈层进行了转化处理,并通过扫描电镜、交流阻抗谱和Fe3+溶出试验等研究了不同pH值的转化液对锈层结构和性能的影响.结果表明:复合转化液能够使锈层结构变得致密稳定,从而使带锈试片的耐腐蚀性能提高;当单宁酸浓度为5 g/L、复合转化液pH值为2时,锈层结构最为致密平整,基材耐腐蚀性好;复合转化层主要由单宁酸铁和磷酸铁组成.
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