采用稳态阳极极化曲线、电化学阻抗谱(EIS)方法和恒电位-恒电流(P-G)瞬态响应测试技术研究了有机缓蚀剂哌啶(PD)对Cr25铁素体不锈钢在NaCl介质中钝化膜破坏的抑制作用,以及缓蚀剂浓度和Cl~-浓度对钝化膜稳定性的影响。研究结果表明PD可有效地提高Cr25不锈钢在NaCl介质中的稳定性。得到研究体系的“临界浓度比”PD:Cl~-=1:100～170(摩尔比)。按照竞争吸咐机制,讨论了PD对Cr25的缓蚀作用,并对照PD对304不锈钢的保护作用,分析了PD对这两种不锈钢保护作用的异同。
The effect of piperidine (PD) on inhibition from the damage of passive film of Cr25 stainless steel in NaCl solutions of various concentrations was investigated by potentiodynamic anodic polarization, P-G transient response measurements and electrochemical impedance spectroscopy (EIS). The results showed that the stability of passive film on Cr25 steel was remarkably improved by PD. In NaCl solution, the "Critical Ratio" of PD concentration to Cl- concentration was determined: PD: Cl- = l:100-170 (mol.). When the ratio of PD to Cl- concentration was greater than the "Critical Ratio", film breakdown potential was almost not influenced by PD and Cl- concentrations. On the contrary, when the ratio was less than the criterion, the notable dependence of film breakdown potential on PD and Cl- concentration was observed. The inhibition mechanism of PD was discussed in terms of the competitive adsorption theory. The similarities and dissimilarities between Cr 25 and 304 stainless steels in inhibition of PD were compared. In addition, a physical model was suggested fof the explanation of the above-mentioned results on the basis of photo-electrochemistry and Mott-Schottky plots measurements.
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