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首页> 外文会议>International Symposium on Pits and Pores II: Formation, Properties, and Significance for Advanced Materials, Oct 22-27, 2000, Phoenix, AZ >SOLUTION CHEMISTRY EFFECTS ON STABLE AND METASTABLE PITTING CORROSION OF Fe-Cr ALLOYS
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SOLUTION CHEMISTRY EFFECTS ON STABLE AND METASTABLE PITTING CORROSION OF Fe-Cr ALLOYS

机译：Fe-Cr合金稳定和亚稳态点蚀的溶液化学作用

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摘要

The present work investigates the interactions between aggressive and inhibiting anions in the electrolyte with the passive metal surface as well as with MnS inclusions, in order to elucidate critical processes in pitting corrosion of Fe-Cr alloys in more detail. For this, electrochemical investigations are being carried out on model alloys, with varying Cr, Mo and impurity (S) contents, in absence and presence of inhibiting anions (up to now, as inhibiting species MoO_4~(2-) anions by addition of Na_2MoO_4 into the electrolyte were studied). Potentiodynamic polarization curves clearly illustrate that Mo present in the alloy or in the electrolyte can significantly increase the resistance against stable pitting (i.e., increase the values of the pitting potentials). However, the inhibition efficiency strongly depends on the alloy composition: the inhibition efficiency increases with increasing Cr- and Mo-content in the alloy and very significantly decreases with increasing S-content. Potentiostatic experiments and analysis of current transients observed (metastable pitting) reveal that Mo in the alloy and MoO_4~(2-) added into the electrolyte show a different dominant action on the processes involved in pitting corrosion. Mo in the alloy does not decrease the number of metastable pitting events; instead the major impact is to hinder the propagation of pits (transition into stable pitting). On the other hand, MoO_4~(2-) added in the solution drastically decreases the number of initiation events.
机译：本工作研究了钝态金属表面以及MnS夹杂物中电解质中的侵蚀性阴离子离子和抑制性阴离子离子之间的相互作用，以便更详细地阐明Fe-Cr合金点蚀的关键过程。为此，正在研究在不存在和存在抑制阴离子的情况下，对具有不同Cr，Mo和杂质（S）含量的模型合金进行电化学研究（到目前为止，通过添加Mg_4〜（2-）作为抑制物质）研究了Na_2MoO_4进入电解液的过程。电位动力学极化曲线清楚地表明，合金或电解质中存在的Mo可以显着增加抗稳定点蚀的能力（即，增加点蚀电位的值）。但是，抑制效率在很大程度上取决于合金成分：抑制效率随着合金中Cr和Mo含量的增加而增加，而随着S含量的增加而显着下降。恒电位实验和对电流瞬变的分析（可蚀变点蚀）表明，合金中的Mo和添加到电解液中的MoO_4〜（2-）对点蚀所涉及的过程具有不同的主导作用。合金中的Mo不会减少亚稳点蚀事件的数量；相反，主要的影响是阻碍了凹坑的传播（过渡到稳定的凹坑）。另一方面，溶液中添加的MoO_4〜（2-）大大减少了引发事件的数量。

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