The Effect of Microstructure of X70 Pipeline Steel on Electrochemical Reactions in an Acidic Soil Environment and Its Implication on SCC Characteristic
The electrochemical property, stress corrosion cracking（SCC）susceptibility of X70 pipeline steel before and after annealing was investigated by potentiodynamic polarization techniques, slow strain rate test（SSRT）and optical metallographic microstructure observation, to detect the effect of the microstructure on the electrochemical reactions and how this effect works on the SCC behaviour in an acidic soil environment. It was demonstrated that the coarse grain can intensify the cathodic electrochemical reactions because that the grain surface of the steel is more active compared to the grain boundary. This effect introduces more hydrogen into the metal matrix which leads to a higher SCC susceptibility of the annealed X70 steel rather than the as received steel.
管线钢 显微组织 电化学反应 应力腐蚀
LIU Zhiyong LI Xiaogang DU Cuiwei
Corrosion and Protection Center,Key Laboratory of Corrosion and Protection of Ministry of Education/ Corrosion and Protection Center，Key Laboratory of Corrosion and Protection of Ministry ofEducation/U
国内会议
福州
英文
1-6
2010-11-01（万方平台首次上网日期，不代表论文的发表时间）