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Effect of the chemistry and structure of the native oxide surface film on the corrosion properties of commercial AZ31 and AZ61 alloys

机译：天然氧化物表面膜的化学和结构对商用AZ31和AZ61合金腐蚀性能的影响

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摘要

The purpose of this study has been to advance in knowledge of the chemical composition, structure and thickness of the thin native oxide film formed spontaneously in contact with the laboratory atmosphere on the surface of freshly polished commercial AZ31 and AZ61 alloys with a view to furthering the understanding of protection mechanisms. For comparative purposes, and to more fully describe the behaviour of the native oxide film, the external oxide films formed as a result of the manufacturing process (as-received condition) have been characterised. The technique applied in this research to study the thin oxide films (thickness of just a few nanometres) present on the surface of the alloys has basically been XPS (X-ray photoelectron spectroscopy) in combination with ion sputtering. Corrosion properties of the alloys were studied in 0.6 M NaCl by measuring charge transfer resistance values, which are deduced from E1S (electrochemical impedance spectroscopy) measurements after 1 h of exposure. Alloy AZ61 generally showed better corrosion resistance than AZ31, and the freshly polished alloys showed better corrosion resistance than the alloys in as-received condition. This is attributed to a combination of (1) higher thickness of the native oxide film on the AZ61 alloy and (2) greater uniformity of the oxide film in the polished condition. The formation of an additional oxide layer composed by a mixture of spinel (MgAl_2O4) and MgO seems to diminish the protective properties of the passive layer on the surface of the alloys in as-received condition.
机译：这项研究的目的是增进对新鲜抛光的商用AZ31和AZ61合金表面上与实验室气氛接触而自发形成的天然氧化薄膜的化学组成，结构和厚度的了解，以进一步促进这种化学反应。了解保护机制。为了比较的目的，并且为了更充分地描述天然氧化膜的行为，已经表征了由于制造过程（接收条件）而形成的外部氧化膜。这项研究中用于研究合金表面存在的薄氧化膜（厚度仅为几纳米）的技术基本上是结合离子溅射的XPS（X射线光电子能谱）。通过测量电荷转移电阻值，在0.6 M NaCl中研究了合金的腐蚀性能，该值是从暴露1 h后的E1S（电化学阻抗谱）测量得出的。 AZ61合金通常显示出比AZ31更好的耐蚀性，而刚抛光的合金在收到时比其合金具有更好的耐蚀性。这归因于以下两种情况的结合：（1）AZ61合金上的天然氧化膜的厚度较高，以及（2）抛光条件下氧化膜的均匀性较高。由尖晶石（MgAl_2O4）和MgO的混合物组成的附加氧化物层的形成似乎降低了按原样状态在合金表面上钝化层的保护性能。

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  • 来源
    《Applied Surface Science》 |2011年第20期|p.8558-8568|共11页
  • 作者

    Sebastian Feliu Jr.; C. Maffiotte; A. Samaniego; Juan Carlos Galvan; Violeta Barranco;

  • 作者单位

    Centro National de Investigaciones Metalurgicas CSIC, Avda. Gregorio del Amo 8,28040 Madrid, Spain;

    CIEMAT-DT (edificio 30), Avda. Complutense, 22,28040 Madrid, Spain;

    Centro National de Investigaciones Metalurgicas CSIC, Avda. Gregorio del Amo 8,28040 Madrid, Spain;

    Centro National de Investigaciones Metalurgicas CSIC, Avda. Gregorio del Amo 8,28040 Madrid, Spain;

    Centro National de Investigaciones Metalurgicas CSIC, Avda. Gregorio del Amo 8,28040 Madrid, Spain,Institute de Ciencias de Materiales de Madrid, ICMM, Consejo Superior de Investigaciones Cientificas, CSIC, Sor Juana Ines de la Cruz, 3, Cantoblanco, 28049, Madrid, Spain;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    magnesium alloys; native oxide film; chemistry and structure; corrosion properties; XPS;

    机译：镁合金天然氧化膜化学和结构;腐蚀性能XPS;

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