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本文应用挂片失重法测定了多元醇磷酸酯及K_2Cr_2O_7,缓蚀剂在腐蚀性水介质中对碳钢、铝(LD10)、不锈钢(1 Cr18Ni 9 Ti)的缓蚀率。试验结果表明,多元醇磷酸酯与K_2Cr_2O_7均具有极好的缓蚀效果,缓蚀率分别可达98％和99％以上。 用电化学方法—极化曲线法,对比测定了多元醇磷酸酯与K_2Cr_2O_7对碳钢、铝和不锈钢在腐蚀性水介质中缓蚀作用的电化学行为。研究结果可以看出,多元醇磷酸酯对三种材质在水介质中电极的阴极和阳极电化学过程均有强烈的抑制作用。重铬酸钾体系对阳极过程有更好的阻滞作用,而多元醇磷酸酯体系对阴极过程比重铬酸钾体系有更强烈的抑制作用。
In this paper, the corrosion inhibition rates of polyols, K 2 Cr 2 O 7 and corrosion inhibitors on carbon steel, aluminum (LD10) and stainless steel (1 Cr18Ni 9 Ti) in corrosive aqueous medium were determined by coupon weightlessness method. The experimental results show that both polyols and K_2Cr_2O_7 have excellent corrosion inhibition effect, and the corrosion inhibition rates are up to 98% and 99% respectively. The electrochemical behavior of the corrosion inhibition of carbon steel, aluminum and stainless steel in corrosive aqueous media was determined by electrochemical method - polarization curve method. The results show that polyhydric alcohol phosphate ester has a strong inhibitory effect on the electrochemical processes of the cathodes and anodes of the three materials in aqueous media. The potassium dichromate system has a better retardation effect on the anodic process, while the polyol phosphoric acid ester system has a stronger inhibitory effect on the cathode process than the potassium dichromate system.