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首页> 外文期刊>Journal of Materials Engineering and Performance >General and Localized Corrosion of Magnesium Alloys: A Critical Review
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General and Localized Corrosion of Magnesium Alloys: A Critical Review

机译：镁合金的一般腐蚀和局部腐蚀：评论综述

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摘要

Magnesium (Mg) alloys as well as experimental alloys are emerging as light structural materials for current, new, and innovative applications. This paper describes the influence of the allying elements and the different casting processes on the microstructure and performance of these alloys and corrosion. It gives a comprehensible approach for the resistance of these alloys to general, localized and metallurgically influenced corrosion, which are the main challenges for their use. Exposure to humid air with approx 65 percent relative humidity during 4 days gives 100-150 nm thickness. The film is amorphous and has an oxidation rate less than 0.01 mum/y. The pH values between 8.5 and 11.5 correspond to a relatively protective oxide or hydroxide film; however above 11.5 a passive stable layer is observed. The poor corrosion resistance of many Mg alloys can be due to the internal galvanic corrosion caused by second phases or impurities. Agitation or any other means of destroying or preventing the formation of a protective film leads to increasing corrosion kinetics. The pH changes during pitting corrosion can come from two different reduction reactions: reduction of dissolved oxygen (0) and that of hydrogen (H) ions. Filiform corrosion was observed in the uncoated AZ31, while general corrosion mainly occurred in some deposition coated alloys. Crevice corrosion can probably be initiated due to the hydrolysis reaction. Exfoliation can be considered as a type of intergranular attack, and this is observed in unalloyed Mg above a critical chloride concentration.
机译：镁（Mg）合金和实验合金正在作为轻型结构材料出现，用于当前，新的和创新的应用。本文介绍了合金元素和不同铸造工艺对这些合金的组织，性能和腐蚀的影响。它为这些合金的一般，局部和冶金学上的腐蚀提供了一种易于理解的方法，这是使用它们的主要挑战。在4天内暴露于相对湿度约为65％的潮湿空气中，其厚度为100-150 nm。该膜是无定形的，并且氧化速率小于0.01μm/ y。 pH值在8.5和11.5之间对应于相对保护性的氧化物或氢氧化物膜。但是，在11.5以上，观察到一个被动稳定层。许多镁合金的耐蚀性差可能是由于第二相或杂质引起的内部电偶腐蚀。搅动或破坏或防止形成保护膜的任何其他方式导致腐蚀动力学增加。点蚀过程中的pH变化可能来自两个不同的还原反应：溶解氧（0）和氢（H）离子的还原。在未涂层的AZ31中观察到丝状腐蚀，而一般腐蚀主要发生在某些沉积涂层的合金中。缝隙腐蚀可能是由于水解反应引起的。剥落可被认为是一种晶间腐蚀，这是在临界氯化物浓度以上的非合金镁中观察到的。

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