模拟酸性海盐气溶胶环境下高强钢的腐蚀行为  

Corrosion Behaviors of High Strength Steel in Simulated Acidic Sea Salt Aerosol Environment

作　　者：张岩[1] 米梦芯 陈琳[1] 王兴平 盛耀权 刘子涵[1] 何壮 肖婕 杨志舒 李宇春[1] ZHANG Yan;MI Meng-xin;CHEN Lin;WANG Xing-ping;SHENG Yao-quan;LIU Zi-han;HE Zhuang;XIAO Jie;YANG Zhi-shu;LI Yu-chun(College of Chemistry and Biology Engineering,Changsha University of Science and Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学化学与生物工程学院,湖南长沙410114

出　　处：《材料保护》2018年第8期58-64,共7页Materials Protection

摘　　要：海盐气溶胶是高强钢在海洋大气环境中失效的主要因素,而目前对于海盐气溶胶的腐蚀研究较少。通过超声雾化模拟高浓度酸性海盐气溶胶环境,采用金相显微镜、电阻探针、扫描电镜(SEM)、腐蚀失重、电化学阻抗谱(EIS)、能谱仪(EDS)等方法研究了Q460B和Q420C 2种高强钢在该环境中的腐蚀行为。结果表明:2种材料的腐蚀速率先加快后减慢最后趋于稳定,Q460B钢的腐蚀产物对钢体保护作用强,钢材耐腐蚀性能更优;模拟液中加淀粉减小了超声雾化气溶胶的粒径,粒径减小使得腐蚀速率加快;海盐气溶胶中参与金属腐蚀的主要因素是Cl-和SO_4^(2-),Br^-不参与腐蚀;且雾化粒径减小能够促进Cl^-和SO_4^(2-)参与基体腐蚀。Sea salt aerosol is the main factor for the failure of materials in the marine atmosphere, but there is less research on the corrosion of sea salt aerosols. The environment of acidic sea salt aerosols with high concentration was simulated, and methods of metallographic microscope, resistance probe, scanning electron microscope （ SEM）, corrosion weight loss method, electrochemical impedance spectroscopy （EIS） and en- ergy spectrum （EDS） were used to study the corrosion behavior of Q460B and Q420C steel in this environment. Results showed that the corro- sion rates of both materials increased first and then slowed down, finally tended to stabilize over time. The corrosion products of Q460B had stronger protective effect on steel substrate, and thus Q460B steel had better corrosion resistance. The addition of starch to the simulated liquid reduced the size of the aerosol, and the decrease of the size of aerosol particles accelerated the corrosion rate. Furthermore, the main factors in- volved in metal corrosion were Cl^- and SO4^2- in sea salt aerosols, while Br did not contribute to corrosion. The decrease of atomized particle size could promote Cl^- and SO4^2- to participate in matrix corrosion more effectively.

关 键 词：超声雾化 海盐气溶胶 高强钢 Q460B Q420C 腐蚀行为 

分 类 号：TG172.3[金属学及工艺—金属表面处理]