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Effect of surface conditions and strain hardening on the passivity breakdown of 304 stainless steel

机译:表面条件和应变硬化对304不锈钢钝化击穿的影响

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摘要

Electrical and electrochemical properties of the passive layer formed on 304L austenitic stainless steel are investigated by means of both conductive atomic force microscopy in air and electrochemical atomic force microscopy in chloride-containing media. The maps of local electrical conductivity of the oxide overlayer exhibit different patterns depending on the surface conditions after mechanical or electrochemical polishing. In particular, the passive film covering strain-hardened regions reveals a higher electrical conductivity. The local enhancement of the electrical conduction is explained by local changes of the stoichiometry of the passive film. Moreover, the highly conductive regions lead to a local breakdown of the native oxide in chloride-containing media and favor the initiation of localized pits.
机译:通过在空气中的导电原子力显微镜和在含氯介质中的电化学原子力显微镜,研究了在304L奥氏体不锈钢上形成的钝化层的电和电化学性能。根据机械或电化学抛光后的表面条件,氧化物覆盖层的局部电导率图显示出不同的图案。特别地,覆盖应变硬化区域的无源膜表现出更高的电导率。通过无源膜的化学计量的局部变化来解释电的局部增强。此外,高导电区域导致天然氧化物在含氯介质中的局部分解,并有利于局部凹坑的产生。

著录项

  • 来源
    《Journal of Materials Research》 |2012年第12期|1580-1588|共9页
  • 作者

    Tewfik Souier; Matteo Chiesa;

  • 作者单位

    Laboratory for Energy and Nano Science, Masdar Institute, Abu Dhabi 54224, United Arab Emirates and Service de Physique et Chimie des Surfaces et Interfaces, CEA Saclay, Gif-sur-yvettes 91191, France;

    Laboratory for Energy and Nano Science, Masdar Institute, Abu Dhabi 54224, United Arab Emirates and Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
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