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一、前言检验奥氏体不锈钢晶间腐蚀的敏感性,国内外沿用的标准实验方法,有10％草酸电解侵蚀试验、硫酸锎—硫酸—铜屑试验(Strauss试验)、65％硝酸试验(Huey试验)等。草酸电解法适宜用于筛选试验,Strauss法和Huey法试验时间都很长,而且要用繁琐的失重法评定晶间腐蚀程度。所以,人们一直寻求既准确又快速、简便的试验方法。近年来,各国在用电化学方法预测不锈钢晶间腐蚀敏感性的研究方面十分活跃,如EPR法,第二阳极电流峰法、恒电位侵蚀法等。本文采用动电位阳极化曲线上第二电流峰值法来检验不同敏化程度的几种不锈钢的晶间腐蚀敏感性,并与试样表面金相形貌及标准的CuSO_4+H_2SO_4+铜屑方法试验结果进行比较,旨在确定第二阳极电流峰法的适用性及其灵敏程度。
I. Preface The sensitivity of testing austenitic stainless steel to intergranular corrosion is the standard test method adopted at home and abroad. There are 10% oxalic acid electrolytic corrosion test, Husky-sulfuric acid-copper chip test (Strauss test), 65% nitric acid test Test) and so on. Oxalic acid electrolysis method is suitable for screening tests, Strauss method and Huey method test time is very long, but also to use cumbersome weight loss method to assess the degree of intergranular corrosion. Therefore, people have been seeking accurate and rapid, easy test methods. In recent years, various countries have been very active in the research on the electrochemical sensitivity prediction of stainless steel intergranular corrosion, such as the EPR method, the second anodic current peak method and the potentiostatic erosion method. In this paper, the anodic polarization curve of the second current peak method to test the sensitivity of several different degrees of susceptibility to intergranular corrosion susceptibility to intergranular corrosion with the specimen surface morphology and standard CuSO 4 + H 2 SO 4 + copper scrap method test results The purpose of the comparison is to determine the applicability and sensitivity of the second anodic peak current method.