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A Treatise on Corrosion Science, Engineering and TechnologyCorrosion Behaviour of Magnesium Alloys and Chemical Conversion Coatings for their Improved Corrosion Resistance

A Treatise on Corrosion Science, Engineering and Technology: Corrosion Behaviour of Magnesium... [Magnesium alloys are lightweight engineering materials with a high strength to weight ratio which are used in aerospace, automotive and biomedical industries. However, the severe corrosion of chemically active magnesium is an area of concern. Significant understanding of the corrosion behaviour of magnesium alloys evolved in the last few decades facilitated the development of many corrosion-resistant alloys. Micro-galvanic corrosion is the most common corrosion identified in Mg alloys. Secondary phases and impurities present in the alloys deteriorate the corrosion properties due to the micro-galvanic effect. The chemistry of surface oxide formation during corrosion also greatly influences the corrosion behaviour. The incorporation of RE (rare earths) or Al in the corrosion layers enhances the corrosion resistance. Though the development of new alloys shows better corrosion characteristics, substantial improvement is still needed for most practical applications. To achieve this, a number of sophisticated coating techniques have been developed. However, due to the simple coating procedure and low cost of production, chemical conversion coatings are still one of the most relevant and practical coating method for Mg alloys. This chapter presents the corrosion behaviour of a few commercially important Mg alloys and various chemical conversions coating developed for Mg alloys.] http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

A Treatise on Corrosion Science, Engineering and TechnologyCorrosion Behaviour of Magnesium Alloys and Chemical Conversion Coatings for their Improved Corrosion Resistance

Part of the Indian Institute of Metals Series Book Series
Editors: Kamachi Mudali, U.; Subba Rao, Toleti; Ningshen, S.; G. Pillai, Radhakrishna; P. George, Rani; Sridhar, T. M.
Arun Kumar, S.; Jayaraj, Jithu; Srinivasan, A.
A Treatise on Corrosion Science, Engineering and Technology — May 5, 2022
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Publisher
Springer Nature Singapore
Copyright
© The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2022
ISBN
978-981-16-9301-4
Pages
315 –330
DOI
10.1007/978-981-16-9302-1_18
Publisher site
See Chapter on Publisher Site

Abstract

[Magnesium alloys are lightweight engineering materials with a high strength to weight ratio which are used in aerospace, automotive and biomedical industries. However, the severe corrosion of chemically active magnesium is an area of concern. Significant understanding of the corrosion behaviour of magnesium alloys evolved in the last few decades facilitated the development of many corrosion-resistant alloys. Micro-galvanic corrosion is the most common corrosion identified in Mg alloys. Secondary phases and impurities present in the alloys deteriorate the corrosion properties due to the micro-galvanic effect. The chemistry of surface oxide formation during corrosion also greatly influences the corrosion behaviour. The incorporation of RE (rare earths) or Al in the corrosion layers enhances the corrosion resistance. Though the development of new alloys shows better corrosion characteristics, substantial improvement is still needed for most practical applications. To achieve this, a number of sophisticated coating techniques have been developed. However, due to the simple coating procedure and low cost of production, chemical conversion coatings are still one of the most relevant and practical coating method for Mg alloys. This chapter presents the corrosion behaviour of a few commercially important Mg alloys and various chemical conversions coating developed for Mg alloys.]

Published: May 5, 2022

Keywords: Magnesium alloys; Corrosion; Micro-galvanic effect; Phosphate conversion coating

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