在150℃含硫、H2S和CO2的盐溶液中,对铁镍基合金925分别进行了均匀腐蚀和四点弯梁应力腐蚀试验,分析了腐蚀后的形貌和腐蚀产物组成,研究了腐蚀反应机理.结果表明:均匀腐蚀试验360 h后,铁镍基合金925表面有明显的局部腐蚀现象,计算所得的均匀腐蚀速率约0.37 mm·a-1,腐蚀产物主要由铁、镍和硫组成,单质硫的加入是合金发生局部腐蚀的主要原因;应力腐蚀试验1 080 h后,该合金没有出现应力腐蚀开裂,腐蚀产物含有大量氧元素,说明有较多的H2O或OH-参与了腐蚀反应.
The uniform corrosion and four point bend-beam stress corrosion tests of iron-nickel-base alloy 925 were conducted in the salt solution containing S,H2S and CO2 at 150 ℃.The corrosion morphology and corrosion product composition were analyzed and the corrosion reaction mechanism was investigated.The results show that after uniform corrosion testing for 360 h,obvious localized corrosion on the surface of the iron-nickel-base alloy 925 was observed;the calculated uniform corrosion rate was 0.37 mm·a-1;the corrosion product was composed of Fe,Ni and S;the addition of S was the main reason of the alloy localized corrosion.After stress corrosion testing for 1 080 h,no stress corrosion cracking was observed on the alloy;the corrosion product had a large number of element O,indicating that much H2O or OH-participated in the corrosion reaction.
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