超临界水氧化过程中pH对镍基合金C-276的腐蚀研究
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摘要
分别以盐酸、硝酸、硫酸与甲醇配制成不同pH值溶液作为腐蚀性介质,研究在超临界水氧化条件下对材料C-276的腐蚀情况。结果表明,3种酸均随着酸性的增强对材料腐蚀的越严重,在pH 5～3,腐蚀速率显著增加,而在pH=6与pH=5、pH=3与pH=2之间,腐蚀速率增幅较小,几乎维持不变。材料经过100 h的腐蚀后,存在较为严重的孔蚀、氧化膜的脱落,其中盐酸环境中还存在严重的晶间腐蚀,腐蚀速率达到最大,为0.231 mm/a。表面的氧化膜主要成分为NiO、Cr_2O_3、MoO_2。
Hydrochloric acid,nitric acid,sulfuric acid and methanol were used as corrosive media to study the corrosion of material C-276 under the condition of supercritical water oxidation.The results showed that both three acid as acid enhancement of material corrosion,between pH 5～3 corrosion rate increased significantly,while pH=6 and pH=5,pH=3 and corrosion rate between pH=2 small,almost remain unchanged.After 100 h of corrosion,the material has a serious hole corrosion and the oxide film falls off.Among them,there is a serious intercrystalline corrosion in the hydrochloric acid environment,with the corrosion rate reaching to the maximum of 0.231 mm/a.The main components of the oxide film on the surface are NiO,Cr_2O_3 and MoO_2.
Hydrochloric acid,nitric acid,sulfuric acid and methanol were used as corrosive media to study the corrosion of material C-276 under the condition of supercritical water oxidation.The results showed that both three acid as acid enhancement of material corrosion,between pH 5～3 corrosion rate increased significantly,while pH=6 and pH=5,pH=3 and corrosion rate between pH=2 small,almost remain unchanged.After 100 h of corrosion,the material has a serious hole corrosion and the oxide film falls off.Among them,there is a serious intercrystalline corrosion in the hydrochloric acid environment,with the corrosion rate reaching to the maximum of 0.231 mm/a.The main components of the oxide film on the surface are NiO,Cr_2O_3 and MoO_2.
引文
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[2] Son Sang-Ha,Lee Jae-Hyuk,Lee Chang-Ha.Corrosion phenomena of alloys by subcritical and supercritical water oxidation of 2-chlorophenol[J].The Journal of Supercritical Fluids,2008,44:370-378.
[3] 闫康平,陈匡民.过程装备腐蚀与防护[M].北京:化学工业出版社,2009.
[4] 卢建树,李肖华,张九渊,等.316L不锈钢和825镍基合金在超临界水氧化分解毒死蜱介质中的腐蚀[J].腐蚀科学与防护技术,2002,14(4):187-190.
[5] Zhang Q,Tang R,Yin K,et al.Corrosion behavior of hastelloy C-276 in supercritical water[J].Corrosion Science,2009,1(9):2092-2097.
[6] 黄寿强,申哲民,朱南,等.几种高温合金在超临界NaCl水溶液中的腐蚀行为对比[J].机械工程材料,2014,38(2):48-53.
[7] 王保峰,卢建树,张九渊,等.不锈钢及镍基合金在高温水中的腐蚀研究[J].腐蚀与防护,2001,22(5):187-190.
[8] Machet A,Galtayries A,Marcus P,et al.XPS study of oxides formed on nickel-base alloys in high temperature and high-pressure water[J].Surface and Interface Analysis,20022,34(1):197-200.
[9] Kocijan A,Donik C,Jenko M.Electrochemical and XPS studies of the passive film formed on stainless steels in borate buffer and chloride solution[J].Supercritical Fluids,2008,47(2):309-317.
[10] Tang Xingying,Wang Shuzhong,Xu Donghai,et al.Corrosion behavior of Ni-based alloys in supercritical water containing high concentrations of salt and oxygen[J].Industrial & Engineering Chemistry Research,2013,52:18241-18250.
[11] 李海丰,范洪远,张强,等.水量C-276镍基合金在600 ℃超临界水中的腐蚀产物及形成的机理研究[J].核动力工程,2011,32(3):38-42.
[12] 王增品,姜安玺.腐蚀与防护工程[M].北京:高等教育出版社,1991.