Native Air-Formed Oxide Film and its Effect on Magnesium Alloys Corrosion

The Open Corrosion Journal Pub Date : 2010-10-13 DOI:10.2174/1876503301003010080

S. Feliu, Juan Carlos Galván, Á. Pardo, M. Merino, R. Arrabal

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引用次数: 29

Abstract

The present work uses X-ray photoelectron spectroscopy (XPS) analysis to compare the chemical composition of native oxide films formed spontaneously on commercial pure magnesium and AZ31, AZ80 and AZ91D magnesium alloys. The study considers both the outer surface and inner regions of the films with the assistance of argon ion bombardment. Possible relationships are established between the alloy Al content and the native oxide film characteristics. The Al content is very similar in the oxide films on all three studied alloys. XPS identifies a much greater film thickness on AZ80 and AZ91D specimens than on AZ31 and pure Mg specimens, which seems to be related with the presence ofphase (Mg17Al12) on the AZ91D alloy surface and of the eutectic � -Mg/� on the AZ80 alloy surface. Considerable Ca segregation is observed (directly related with the calcium impurities content in the bulk material) towards the outer surface of the metal, where it appears in the form of calcium oxide. Direct correspondence is found between the thickness of the native oxide film formed spontaneously on the surface of magnesium and its alloys and their subsequent corrosion resistance in exposure to a 3.5 wt% NaCl solution.

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天然气相氧化膜及其对镁合金腐蚀的影响

本文采用x射线光电子能谱(XPS)分析方法，比较了工业纯镁与AZ31、AZ80和AZ91D镁合金上自发形成的天然氧化膜的化学成分。在氩离子轰击的辅助下，研究了薄膜的外表面和内部区域。建立了合金Al含量与天然氧化膜特性之间的可能关系。三种合金的氧化膜中Al的含量非常相似。XPS发现AZ80和AZ91D试样的膜厚远大于AZ31和纯Mg试样，这可能与AZ91D合金表面存在相(Mg17Al12)和AZ80合金表面存在共晶α -Mg/ α有关。观察到相当大的钙偏析(与大块材料中的钙杂质含量直接相关)向金属的外表面，在那里它以氧化钙的形式出现。在3.5 wt% NaCl溶液中，发现在镁及其合金表面自发形成的天然氧化膜的厚度与其随后的耐腐蚀性之间存在直接对应关系。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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The Open Corrosion Journal

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