弹性应力对碳钢在海水环境中腐蚀速率的影响  

Effects of elastic stress on corrosion rate of carbon steel in seawater

作　　者：杨宏启[1] 张崎[1] 李一民[1] 黄一[1] 

机构地区：[1]大连理工大学船舶工程学院,辽宁大连116024

出　　处：《华中科技大学学报（自然科学版）》2016年第10期16-21,共6页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50921001;51221961;51379031);国家重点基础研究发展计划资助项目(2011CB013704);工信部高技术船舶资助项目

摘　　要：为了研究船舶与海洋工程结构在载荷和腐蚀环境联合作用下的腐蚀损伤规律,通过电化学测试技术研究了弹性应力对Q235B钢在质量分数为3.5%NaCl溶液中的腐蚀电位、动电位极化曲线、线性极化电阻和电化学阻抗谱的影响规律;同时,利用接触角测量技术研究了弹性应力对金属在腐蚀介质中界面张力的影响.研究结果表明:随着弹性应力的增大,Q235B钢在3.5%NaCl溶液中的腐蚀电位明显负移,腐蚀速率显著增大,根据电化学测试结果建立了腐蚀速率与应力关系模型;界面张力与接触角随着应力的增大而显著减小,因此可以利用金属材料在环境介质中的界面张力研究力学-化学效应问题.In order to study the corrosion cumulative damage of ship and marine structures under the combined effects of loading and corrosion conditions, the effects of elastic stress on corrosion potential, potentiodynamic polarization characteristics, linear polarization resistance and electrochemical impedance spectra for Q235B steel in 3.5% NaCl solution were investigated by employing the electrochemical measurement techniques. Meanwhile, the impact of elastic stress on the interracial tension between the metal and solution was also studied by using the contact angle measurement technique. Experimental results show that elastic stress can cause negative shift of corrosion potential and accel- erate corrosion of steel significantly. Based on the results of electrochemical measurements, a model of elastic stress on corrosion rate was established. Both interfacial tension and surface contact angle de- crease significantly with the increase of stress level, and thus the interracial tension between metal and solution can be applied to the study of mechano-chemical effect.

关 键 词：腐蚀 力学-化学效应 电化学测试 接触角 界面张力 

分 类 号：TG172.5[金属学及工艺—金属表面处理]