新型复配阻锈剂的电化学性能研究

Study on electrochemical properties of new composite inhibitor in simulated concrete solution

添加阻锈剂可以有效防止或减轻钢筋锈蚀,但目前使用的阻锈剂大多含有亚硝酸盐,不仅污染环境而且会使后期稳定性变差,开发高性能、低成本、环保无污染的新型阻锈剂可为钢筋防腐研究的发展提供新的途径。文章通过复配得到一种新型阻锈剂,利用电化学方法研究了加入氯化钠的混凝土模拟液中钢筋的阻锈性能,运用极化曲线和电化学阻抗谱等手段分析了阻锈剂的作用原理,并与钼酸盐和醇类阻锈剂进行对比。结果表明:当新型复配阻锈剂掺量为4wt%时,其对钢筋的阻锈效果最佳;新型复配阻锈剂能同时抑制钢筋表面的阴极和阳极反应,阻锈效果更加稳定;复配得到的新型阻锈剂具有良好的效果。

Adding corrosion inhibitors can effectively prevent or reduce the corrosion of steel bars, but most of the corrosion inhibitors currently used contain nitrite, which will cause environmental pollution. The development of new corrosion inhibitors with high performance, low cost and environmental protection can provide a new way for the development of anti-corrosion research of steel bars. In this paper, a new corrosion inhibitor was obtained by combination. The effect of corrosion inhibitor on reinforcing steel bar was studied by electrochemical test and analysis method after adding NaCl concrete simulation solution. The mechanism of inhibitor was analyzed by polarization curve and electrochemical impedance spectroscopy, and compared with molybdate and alcohols. The results show that the new compound rust inhibitor has a good effect;when the mass fraction of the new compound rust inhibitor is 4%, the effect of the new compound rust inhibitor is the best;the new compound rust inhibitor can inhibit the cathode and anode reaction on the surface of the steel bar at the same time, and the effect of the new compound rust inhibitor is more stable. The experimental results indicate that the corrosion inhibitor can form a dense molecular film on the surface of reinforcing steel bar. Compared with molybdate and alcohol corrosion inhibitors, it has longer action time, more stable rust inhibition effect, and is an environmentally friendly rust inhibitor.