アミノアクリル系樹脂被覆マグネシウム合金の耐食性に及ぼすシランカップリング処理の影響

摘要

マグネシウムは実用金属中で最軽量であり，比強度が高く，放熱性，振動吸収性，耐くぼみ性，寸法安定性およびリサイクル性などに優れた特性を有する材料である。また，サステイナブルマテリアル（持続可能な材料）としても注目されており，自動車および航空機などの輸送機器部品，ノートパソコンおよびデジタルカメラなどの携帯電子機器の筐体などへの利用が進められている。%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.rnThis 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.rnResults 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.