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将人为损伤的自修复涂层钢筋置于海水中浸泡,通过测量钢筋的自腐蚀电位、涂层下的钢筋腐蚀面积、涂层和钢筋界面间的粘附性,并观察涂层破损处的锈蚀状况,研究自修复涂层中的亚硝酸离子对破损涂层处钢筋腐蚀的抑制效果,及碱性环境对亚硝酸离子抑制效应的影响.结果表明,自修复涂层中的水泥和其碱性环境对抑制腐蚀有促进作用;涂层中添加的亚硝酸盐对钢筋腐蚀有显著的抑制效果;亚硝酸盐和水泥的复合抑制效果优于它们独立的抑制效果,且亚硝酸盐含量越高,腐蚀抑制效果越明显.并对自修复涂层的阻锈机理进行了探讨.
The artificial damaged self-healing coated steel bars were soaked in seawater. The self-corrosion potentials of reinforced bars, the corrosion area of rebar under the coatings, the adhesion between the coating and the steel bar interface were measured and the corrosion of the damaged coatings was observed The effect of nitrite ions in self-repairing coating on the corrosion of steel bars on the damaged coating and the effect of alkaline environment on the inhibitory effect of nitrite ion were studied.The results showed that cement and its alkaline The environment can promote corrosion inhibition; the addition of nitrite in the coating has a significant inhibitory effect on the corrosion of steel; the compound inhibition effect of nitrite and cement is superior to their independent inhibitory effect, and the higher the content of nitrite, The more obvious the corrosion inhibition effect is, the anti-rust mechanism of self-healing coating is also discussed.