作　　者： ; ; ; ; ;

机构地区： 广东石油化工学院

出　　处： 《人民黄河》 2013年第5期124-127,130,共5页

摘　　要： 通过测定不锈钢及其焊缝在不同pH值、不同氯离子浓度的模拟混凝土孔隙液中的腐蚀速度和阳极极化曲线,分析了其腐蚀行为。结果表明:在不含氯离子的模拟混凝土孔隙液中,随着pH值的减小,不锈钢母材及其焊缝能保持优良的钝性,钝化膜的自愈修复能力很强,混凝土碳化对不锈钢的耐蚀性影响不大;在相同pH值的模拟混凝土孔隙液中,随着氯离子浓度的提高,不锈钢及其焊缝点蚀电位降低,钝化膜的自我修复能力变弱,腐蚀率略有增大;在相同介质条件下,不锈钢母材耐蚀性能比焊缝区域好,腐蚀后表面形貌分析表明,焊缝附近主要发生晶间腐蚀,母材区域主要发生点腐蚀。 Through determining the corrosion rate and the anodic polarization curve of the stainless steel and its welding seam in simulation concrete pore fluid in different pH values and chloride ion contents, the variation regulations of corrosion parameters were analyzed. The results show that the pH values have little effect on corrosion behavior of stainless steel and its welding seam in simulation concrete pore fluid without chloride ion. It means that lower pH values appear accompanying with carbonization of concrete the passivated films of the stainless steel and its welding seam were still compact. In the same pH value of simulated concrete pore fluid, the pit corrosion resistance of stainless steel and welding seam degraded as the chloride ion concentration increase. Corrosion resistance of the stainless steel region is better than welding seam region under the same ambient con- dition. The corroded surface morphologies are mainly pit corrosion in stainless steel region and inter-crystalline erosion in welding seam region.

关 键 词： 不锈钢 焊缝 腐蚀行为 模拟混凝土孔隙液 氯离子浓度 值

领　　域： [水利工程]