对316L不锈钢法兰在苯甲酸环境中因腐蚀失效进行了分析，发现不锈钢因焊接导致的晶间腐蚀是不锈钢法兰腐蚀失效的主要原因，此外，焊接材料与基体材料的不同以及使用了导电的垫片石墨会引起电偶腐蚀，不锈钢法兰之间存在缝隙会引发缝隙腐蚀，提出了解决措施．
An analysis was conducted on corrosion failure of 316L stainless steel flange in benzoic acid by diverse laboratory examinations. It has been found that intergranular corrosion caused by the joint of stainless steel is the immanent cause of corrosion failure of 316L stainless steel flange. Besides, the difference between jointing materials and base metal can give rise to dissimilar metal corrosion, so do the use of conductive material-plumbago served as a padding. The crevice between stainless steel flanges can cause crevice corrosion.Some pertinent preventive methods are put forward to on the basis of the analysis of corrosion failure and simulated tests in laboratory.
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