Mg_2Si COATING TECHNOLOGY ON MAGNESIUM ALLOYS TO IMPROVE CORROSION AND WEAR RESISTANCE

摘要

Magnesium silicide (Mg_2Si) bulky material has a possibility to improve the surface function of light metals such as magnesium or aluminum alloys due to its superior corrosion resistance to the conventional stainless steel and high mechanical properties. In this study, Mg_2Si thin film coated on AZ31 magnesium alloys by using a high frequency sputtering method, was examined. Neutral salt spray test to evaluate the corrosion resistance indicated that AZ31 substrate with Mg_2Si coating was hardly damaged after 240h. On the other hand, non-treated one was corroded in only 1h. Concerning wear resistance under oil lubricant test, a friction coefficient, μ of the AZ31 alloy with Mg_2Si film is remarkably stable in employing S35C steel as a counter specimen. No sticking between both specimen was detected. In the combination of AZ31 alloy disc and S35C pin specimens, seizure and sticking phenomena occurred and μ value suddenly increased. Accordingly, Mg_2Si coating technology is a suitable surface modification processing to improve corrosion and wear resistance of magnesium alloys.