敏化的1Cr18Ni9Ti在炼油厂含连多硫酸水样中的应力腐蚀  

SCC OF SENSITIZED 1Cr18Ni9Ti STAINLESS STEEL IN H_2S_xO_6 SOLUTION IN REFINERY

作　　者：段学章[1] 许素珍[1] 李铁藩[1] 

机构地区：[1]中国科学院金属腐蚀与防护研究所

出　　处：《中国腐蚀与防护学报》1990年第3期271-274,共4页Journal of Chinese Society For Corrosion and Protection

基　　金：中国科学院腐蚀科学开放实验室资助

摘　　要：连多硫酸(H_zS_xO_6,x=2,3,4,5)容易引起敏化的奥氏体不锈钢发生应力腐蚀开裂。前人测定不锈钢在Samens溶液中的阳极极化曲线,或用U型试样进行应力蚀研究。本工作采用炼油厂的现场水样,测定敏化的1Cr18Ni9Ti不锈钢的电化学行为和应力腐蚀敏感性。Stress Corrosion Cracking(SCC)susceptibility of sensitized 1 Cr18Ni9Ti austenitic steel was investigated by measuring potgntiody- namie polarization curves(sean rates:10 mV/min and 20 mV/s)and using the slow strain rate test(SSRT)in the polythionic acid solution formed in the petroleum refinery. The results showed that there was a critical potential range between +60 and +1200 mV(SCE)in H_2S_xO_6 solution in refinery for stress corrosion cracking of sensitized 1 Cr18Ni9Ti stainless steel to occur. The metallographic studies of the fractured surface by SEM revealed intergranular and quasi-cleavage fracture in the critical potential zone.

关 键 词：连多硫酸 1CR18NI9TI 应力腐蚀 

分 类 号：TG174.22[金属学及工艺—金属表面处理]