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应用腐蚀失重、弱极化和动态极化曲线等方法,重点研究了黄铜H68A在不同浓缩倍数海水中的腐蚀行为及其缓蚀剂。腐蚀研究结果表明,黄铜H68A的腐蚀速率随时间的延长逐渐降低,温度升高腐蚀速率在50℃达到最大,随浓缩倍数的增大腐蚀速率降低,原海水中腐蚀最重;缓蚀剂研究表明,有机缓蚀剂和无机缓蚀剂复合使用,协同效应明显。采用高复合预膜缓蚀剂含量处理,再在相对低复合缓蚀剂含量正常运行,浓缩倍数N≤2.0时,黄铜H68A、HSn70和HSn62的腐蚀率≤0.01 mm/a,腐蚀得到有效控制。
Corrosion behavior of brass H68A in different concentration times seawater and its corrosion inhibitor were studied emphatically by means of corrosion weight loss, weak polarization and dynamic polarization curves. The results of corrosion study showed that the corrosion rate of brass H68A gradually decreased with the increase of time, and the corrosion rate of brass H68A reached the maximum at 50 ℃. The corrosion rate decreased with the increase of concentration ratio, and the corrosion rate was the highest in seawater. It shows that the combination of organic corrosion inhibitor and inorganic corrosion inhibitor has obvious synergistic effect. The corrosion rate of brass H68A, HSn70 and HSn62 is less than or equal to 0.01 mm / a, and the corrosion is effectively controlled by using the high composite pre-membrane corrosion inhibitor content treatment. When the relative low composite corrosion inhibitor content is normal operation, .