Water quality and scum of vessel is detected by Ion chromatogram and XPS respectively. Corrosion failure Manner and mechanism, the cause of crack is discussed comprehensively. 运用离子色谱法、络合滴定法和XPS分别对除氧器水箱的水质和垢成分进行了分析,并对水箱材质的腐蚀失效模式和腐蚀机理进行了讨论,综合分析了除氧器水箱裂纹形成的原因。