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.
引文
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