Chemistry of corrosion products of Zn and MgZn pure phases under atmospheric conditions

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• 作者：E. Diler ; S. Rioual ; B. Lescop ; D. Thierry ; B. Rouvellou
• 关键词：C. Atmospheric corrosion ; A. Zinc ; A. Magnesium ; B. XPS ; B. XRD ; B. IR spectroscopy
• 刊名：Corrosion Science
• 出版年：2012
• 出版时间：December, 2012
• 年：2012
• 卷：65
• 期：Complete
• 页码：178-186
• 全文大小：1249 K

文摘

We present a corrosion behaviour study of pure phases of zinc and zinc-magnesium contaminated with NaCl and exposed to humid air for 30 days: Zn, Mg₂Zn₁₁ and MgZn₂. The composition of corrosion products is analysed using infrared spectroscopy (FTIR), X-ray diffraction (XRD), ion chromatography (IC), and X-ray photoelectron spectroscopy (XPS). The improved corrosion stability of MgZn₂ is found to be connected to changes in the surface pH and to the nature of the formed corrosion products. The presence of magnesium modifies the proportion of the OH and CO₃ bonds in the corroded products. This explains the improvement in corrosion resistance.