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首页> 外文期刊>Corrosion Engineering, Science and Technology >Using of transpassive dissolution for detection of structural changes in 9Cr-1Mo creep resistant steel
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Using of transpassive dissolution for detection of structural changes in 9Cr-1Mo creep resistant steel

机译：利用非能动溶解检测9Cr-1Mo抗蠕变钢的组织变化

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摘要

The development of structural changes during long term service is a serious problem of heat resistant steels due to formation of deleterious Cr- and Mo-rich phases in the structure. Since chromium and molybdenum are easily soluble by transpassive mechanisms, electrochemical polarisation in appropriate electrolyte could be used as method for detection of such phases. Transpassive behaviour of creep resistant steel 9Cr-1Mo (P91) in different states of heat treatment/long term aging was studied in this work. Materials were studied by means of electrochemical methods, OES analysis and SEM observation. Potentiodynamic curves of tempered and aged (650 degrees C/10 000 h) samples in NaOH solution show a significant local peak in transpassivity/secondary passivity region. No peak was observed on polarisation curve of quenched sample. Formation of the local peak on polarisation curve is assumed to be caused by dissolution of Cr- and Mo-rich phases by a transpassive mechanism. This assumption was confirmed using potentiostatic etching, chemical analysis of electrolytes and microstructure observation.
机译：由于在结构中形成有害的富含Cr和Mo的相，因此在长期使用过程中结构变化的发展是耐热钢的一个严重问题。由于铬和钼易于通过透射机制溶解，因此可以在适当的电解质中将电化学极化用作检测此类相的方法。这项工作研究了抗蠕变钢9Cr-1Mo（P91）在不同热处理/长期时效状态下的穿越性行为。通过电化学方法，OES分析和SEM观察对材料进行了研究。在NaOH溶液中回火和老化的样品（650℃/ 10 000 h）的电位动力学曲线显示出在透射率/次级钝化率区域中存在明显的局部峰。在淬火样品的极化曲线上未观察到峰。极化曲线上局部峰的形成被认为是由于富铬和富钼相通过一种穿越钝化机制而引起的。使用恒电位蚀刻，电解质的化学分析和微观结构观察证实了这一假设。

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