<正> 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.
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