Corrosion Properties of 20＃ Pipelines Steel in Near-neutral Soils
Corrosion law and mechanism of 20* lowcarbon steel in near-neutral soil along Yangtze River in Nanjing are studied by experiments of buried specimens in laboratory. In three kinds of soils, the corrosion features and products are analyzed by EDS and XRD, and the relation of corrosion rates, opencircuit potential and polarization curve with times are tested. The results indicated that corrosion rates changed incessantly along. On the condition of the same times, specimens and different soil samples, the corrosive degree of 1＃ and 2# specimens are serious, but 3# specimen is serious lightly. The corrosion products are main non-crystalloid, Fe (OH) 3 and Fe2O3. The changing tendency of different times and soils is different, and accordant with that of cor rosion rates. The corrosion mechanism is discussed lastly, in near-neutral soils, oxygen is deoxidized and OH ions are created in cathode area, iron is oxidized and the hydration of Fe2+ ions is created with water from soil in anode area, and Fe2+ are converted into more steady products Fe (OH)3 and Fe2O3.
Buried pipeline near-neutral soil corrosion mechanism electrochemistry
WANG Wen-he YI Jun SHEN Shi-ming
College of Safety Engineering,Chongqing University of Science & Technology,Chongqing,401331,PR,China Chongqing Academy of Safety Science and Technology,Chongqing,401331,PR,China Research Center of Engineering Risk Analysis Technology,SINOPEC,Nanjing,210009,PR,China
国际会议
2010 International Conference on Material and Manufacturing Technology(2010材料与制造技术国际会议 ICMMT2010)
重庆
英文
312-316
2010-09-17（万方平台首次上网日期，不代表论文的发表时间）