摘要
采用电化学阻抗谱技术研究了耐候钢Q400NQR1和09CuPCrNi在2.0%NaCl中性溶液中的腐蚀行为,建立了其腐蚀等效电路模型并分析了其相关电化学参数随时间的演化规律.结果表明,两种耐候钢的溶液腐蚀过程均可以分为四个阶段, 即点蚀诱导期、点蚀发展期、腐蚀中期和腐蚀后期;Q400NQR1较09CuPCrNi具有较高的抗溶液腐蚀能力,前者在腐蚀的中期生成保护性较强的内层锈层,而后者形成的内层锈层难以稳定且易于出现均匀腐蚀的现象.
The corrosion processes of two kinds of weathering steels, Q400NQR1 and 09CuPCrNi, in 2.0% NaCl neutral solution were studied with electrochemistry impedance spectrum technique, and an equivalent electric circuit model was proposed, which is based on the physicochemical process of the corrosion, to analyze the evolution features of the corresponding electrochemical parameters. The results show that the whole corrosion process of weathering steels can be divided into four segments： metstable-pitting region, stable pitting region, medial corrosion region and general corrosion region. Q400NQR1 possesses higher anticorrosion ability than 09CuPCrNi due to the formation of the denser inner corrosion products layer, which covered on the surface of the Q400NQR1 substrate and inhibited the diffusion of the corrosive species from the environment to the substrate.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2005年第8期860-864,共5页
Acta Metallurgica Sinica
基金
国家自然科学基金资助项目50499335
关键词
耐候钢
腐蚀
电化学阻抗谱
weathering steel, corrosion, electrochemistry impedance spectrum
