Wear and Galvanic Corrosion Protection of Mg alloy via Plasma Electrolytic Oxidation Process for Mg Engine Application

2009-01-0790

04/20/2009

Event
SAE World Congress & Exhibition
Authors Abstract
Content
Sliding wear of magnesium (Mg) engine cylinder bore surfaces and corrosion of Mg engine coolant channels are the two unsolved critical issues that automakers have to deal with in development of magnesium-intensive engines. In this paper, Plasma Electrolytic Oxidation (PEO) process was used to produce oxide coatings on AJ62 Mg alloy to provide wear and corrosion protection. In order to optimize the PEO process, orthogonal experiments were conducted to investigate the effect of PEO process parameters on the wear properties of PEO coatings. The PEO coatings showed a much better wear resistance, as well as a smaller friction coefficient, than the AJ62 substrate. The galvanic corrosion property of AJ62 Mg coupled with stainless steel and aluminum (Al) was investigated via immersion corrosion test in an engine coolant. Applying PEO coating on Mg can effectively prevent the galvanic corrosion attack to Mg. Due to the small thickness of the PEO coating, the thermal conductivity of Mg would not be appreciably affected. The test results showed a great promising in wear and corrosion protection of Mg for Mg engine application.
Meta TagsDetails
DOI
https://doi.org/10.4271/2009-01-0790
Pages
9
Citation
Zhang, P., Nie, X., and Hu, H., "Wear and Galvanic Corrosion Protection of Mg alloy via Plasma Electrolytic Oxidation Process for Mg Engine Application," SAE Technical Paper 2009-01-0790, 2009, https://doi.org/10.4271/2009-01-0790.
Additional Details
Publisher
Published
Apr 20, 2009
Product Code
2009-01-0790
Content Type
Technical Paper
Language
English