镀锌钢接地材料在酸性土壤中的腐蚀行为研究  

Corrosion Behavior of Galvanized Q235 Steel for Grounding in Acid Soils

作　　者：郑敏聪[1] 李建华[1] 聂新辉[1] 李博文[2] 台闯[2] 

机构地区：[1]国网安徽省电力公司电力科学研究院,合肥230601 [2]中国科学院金属研究所材料环境腐蚀中心,沈阳110016

出　　处：《中国腐蚀与防护学报》2015年第1期27-32,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：国家电网公司科技项目(KG12K16004和5211DS11049)资助

摘　　要：采用电化学阻抗(EIS)和动电位极化曲线方法对镀锌钢接地材料在不同pH值的酸化土壤中的腐蚀规律进行了研究。结果表明,镀锌钢在酸性土壤中腐蚀初期存在中间产物吸附的现象,在Nyquist图低频区诱发了一个感抗弧。随着腐蚀产物的生成,感抗弧消失;低频区容抗弧逐渐增大。镀锌钢在酸化土壤中的腐蚀过程主要由阴极过程控制,腐蚀速率随酸化溶液pH值的增大而减小,随腐蚀时间的延长先增大后减小。Electrochemical behavior of galvanized Q235 steel for grounding in acidified soils with different p H value was investigated utilizing electrochemical impedance spectrum(EIS) and potentiodynamic polarization tests. Results showed that the corrosion behavior of galvanized Q235 steel in acid soils presents an adsorption of intermediate corrosion products in the early stage, and a low frequency inductive loop then induced in Nyquist plot. With the formation of corrosion products on the surface of the steel, the inductive loop disappeared, the low frequency capacitive arc enlarged gradually. The corrosion process is mainly controlled by the cathodic process. The corrosion rate of the galvanized Q235 steel decreased with the increasing p H of the acidified solution, it also increased and then decreased with the increasing time.

关 键 词：镀锌钢 酸性土壤 腐蚀 EIS 

分 类 号：TG172.4[金属学及工艺—金属表面处理]