2010 Volume 61 Issue 12 Pages 835
Magnesium is a light metal with high specific strength and electromagnetic shielding properties. however, magnesium is inferior to corrosion resistance. For that reason, it is important to improve its corrosion resistance through surface treatments. Typical surface treatments of magnesium include conversion coating, anodizing and coating. Chromate coating is well known as one method that is limited to use for surface treatments because of its carcinogenicity. Coating processing is an effective method of improving magnesium corrosion resistance.
This paper describes the effects of silane coupling treatment on the corrosion resistance of magnesium alloys by aminoacrylate system coating. To improve magnesium's corrosion resistance, we evaluated corrosion resistance of Mg(OH)2 coating, silane coupling treatment, and inorganic-organic composite coating with graded structures from substrates by conducting salt-spray testing (SST), along with perspiration-resistance, cross-cut, and boilproof tests.
Results show that the high-corrosion resistance treatment with silane coupling + inorganic-organic composite coating (aminoacrylate system coating) on magnesium alloy was about 1000 hr by SST. In addition, corrosion resistance of silane coupling + inorganic-organic composite coating affected the coating thickness.
