剝離PE防腐層破損點下鋼質(zhì)管線的陰極保護
發(fā)布時間:2018-08-19 18:42
【摘要】:基于長輸管線三層聚乙烯(3PE)防腐層失粘剝離現(xiàn)場開挖調(diào)查的情況,構(gòu)建剝離防腐層下管道表面微區(qū)環(huán)境腐蝕模擬研究實驗裝置,研究華南酸性土壤環(huán)境條件剝離防腐層下管體表面的陰極保護和微區(qū)環(huán)境特征,采用微電極技術(shù)監(jiān)測剝離區(qū)管線鋼表面的局部電位和環(huán)境p H值的變化。結(jié)果表明,剝離區(qū)管線的有效保護距離隨陰極保護電位負移而增加;在高電阻率酸性土壤環(huán)境中,剝離防腐層下的陰極保護僅限于破損點附近,剝離區(qū)深處管體處于自腐蝕狀態(tài);剝離防腐層下陰極保護有效性及其屏蔽程度可由剝離防腐層下微區(qū)溶液p H值判定。
[Abstract]:Based on the investigation of field excavation of three-layer polyethylene (3PE) anticorrosive coating for long distance transportation pipeline, a simulated experimental device for environmental corrosion simulation of pipeline surface micro-area under peeling anticorrosion coating was constructed. The cathodic protection and microenvironmental characteristics of the lower pipe surface of the stripping anticorrosive coating were studied under the environmental conditions of acidic soil in South China. The local potential and environmental pH value of pipeline steel in stripping zone were monitored by microelectrode technique. The results show that the effective protection distance increases with the negative shift of cathodic protection potential, and in high resistivity acidic soil, the cathodic protection under stripping anticorrosion layer is only near the damage point. The effectiveness and shielding degree of cathodic protection under stripping corrosion coating can be determined by pH value of microzone solution under stripping corrosion coating.
【作者單位】: 中國科學(xué)院金屬研究所國家腐蝕控制工程技術(shù)研究中心材料環(huán)境腐蝕研究中心;中國石油管道公司大連輸油氣分公司鞍山輸油站;中國石油天然氣股份有限公司西南管道分公司;
【分類號】:TG174.41
本文編號:2192493
[Abstract]:Based on the investigation of field excavation of three-layer polyethylene (3PE) anticorrosive coating for long distance transportation pipeline, a simulated experimental device for environmental corrosion simulation of pipeline surface micro-area under peeling anticorrosion coating was constructed. The cathodic protection and microenvironmental characteristics of the lower pipe surface of the stripping anticorrosive coating were studied under the environmental conditions of acidic soil in South China. The local potential and environmental pH value of pipeline steel in stripping zone were monitored by microelectrode technique. The results show that the effective protection distance increases with the negative shift of cathodic protection potential, and in high resistivity acidic soil, the cathodic protection under stripping anticorrosion layer is only near the damage point. The effectiveness and shielding degree of cathodic protection under stripping corrosion coating can be determined by pH value of microzone solution under stripping corrosion coating.
【作者單位】: 中國科學(xué)院金屬研究所國家腐蝕控制工程技術(shù)研究中心材料環(huán)境腐蝕研究中心;中國石油管道公司大連輸油氣分公司鞍山輸油站;中國石油天然氣股份有限公司西南管道分公司;
【分類號】:TG174.41
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