摘要
研究了4种镍基合金不锈钢试样（1Cr18Ni9Ti、316L、0Cr18Ni12Ti和00Cr17Ni14Mo）在超临界水氧化过程中（390～620℃、24～32 MPa）处理含硫废水时的腐蚀试验.经过30天的试验,用扫描电子显微镜观测试样腐蚀的形貌.结果表明：4种合金在含硫水溶液中,经超临界水氧化反应均存在腐蚀现象.实验对腐蚀速率进行了测试,其中1Cr18Ni9Ti腐蚀速率较大,316L存在点蚀现象,0Cr18Ni12Ti存在晶间腐蚀现象,而00Cr17Ni14Mo镍基合金不锈钢腐蚀速率为0.25 mm·a^-1,可以制造超临界水氧化反应器.此外,分析了各种材质的腐蚀机理.
Generally stainless steels may be corroded by sulphate solution in the process of supercritical water oxidation. The Ni- based alloy stainless steel samples, including 1Cr18Ni9Ti, 316L, 0Cr18Nil2Ti and 00Cr17Ni14Mo, were tested by supercritical water oxidation at 390 -620 ℃ and 24 32 MPa in the sulphate bearing wastewater for 30 days. Results showed that all the alloys exhibited corrosion through Scanning Electron Microscope （SEM）. The corrosive rate of 1Cr18Ni9Ti stainless steels is the biggest; 316L suffer pit corrosion. Intergranular corrosion is found on 0Cr18Ni12Ti. The corrosion rate of 00Cr17Ni14Mo is 0.25 mm ·a^-1 , and can be used to make reactor of SCWO. The mechanism of corrosion was also examined.
出处
《黑龙江大学自然科学学报》
CAS
北大核心
2008年第5期584-588,共5页
Journal of Natural Science of Heilongjiang University
基金
Shanghai Leading Academic Discipline Project(B604)
关键词
超临界水氧化
腐蚀
含硫化物废水
镍基合金
晶间腐蚀
supercritical water oxidation
corrosion
sulphate wastewater
nickel based alloy
intergranular corrosion
