某公司醋酸乙烯不锈钢管线在第二次水压试验时发生渗漏失效。为查明渗漏原因,对渗漏管线取样,采用宏观分析、材质成分分析、金相分析、扫描电镜分析和能谱分析等手段对样品进行检验。结果表明:渗漏失效是由点腐蚀引发的孔蚀引起,主要原因是管道材料不合格;第一次水压试验后未清除试压介质,其中存在的Cl-也促进了渗漏失效的发生。 A company vinyl acetate stainless steel pipeline leak test failure occurred in the second hydraulic test. In order to find out the cause of seepage, samples of seepage pipeline were sampled, and the samples were tested by macroscopic analysis, material composition analysis, metallographic analysis, scanning electron microscopy and energy spectrum analysis. The results show that the leakage failure is caused by the pitting corrosion caused by pitting corrosion, which is mainly caused by the unqualified pipeline materials. The pressure test medium is not removed after the first hydrostatic test, and the presence of Cl- also promotes the occurrence of leakage failure .