不锈钢硫酸-硫酸铜晶间腐蚀试验国内外标准对比解析

Comparative Analysis on Standards for Sulfuric Acid-Copper Sulfate Intergranular Corrosion Test of Stainless Steels at Home and Abroad

不锈钢硫酸-硫酸铜晶间腐蚀试验作为一种广泛应用的晶间腐蚀试验方法,各国对其制定了不同的标准。以GB/T 4334,ASTM A262,ISO 3651-2,RCC-M等标准为例,从试样制备、敏化处理、试验过程和结果评定4个方面对比分析了国内外各标准的差异。结果表明:国标和国外标准的规定不尽相同,实际操作过程中可适当相互借鉴;国标对试样制备的表述最为详细,试样表面粗糙度对试验结果的影响并不明显;国标对敏化处理制度的规定最为严格;弯曲参数的选择对试验结果存在一定的影响,过小的弯曲半径容易导致误判。

Stainless steel sulfuric acid-copper sulfate intergranular corrosion test as a widely used intergranular corrosion test method,many countries have developed different standards for it.Taking GB/T 4334,ASTM A262,ISO 3651-2,RCC-M and other standards as examples,the similarities and differences among above domestic and foreign standards were compared and analyzed from four aspects:sample preparation,sensitization treatment,test process and result evaluation.The results show that the requirements of national standard and foreign standards are not the same,and they can be used for reference in the actual operation process.The national standard has the most detailed expression of sample preparation,and the effect of surface roughness of the sample on the test results is not significant.The national standard has the strictest regulations on the sensitization treatment system.The selection of the bending parameters has a certain influence on the test results,and too small bending radius is likely to lead to misjudgement.