Effect of Colloidal Particle on Formation of Micro-arc Oxidation Coating on 6061 Alumin m Alloy

• 作 者: Cai-wen Liu Meng-ling Yao Hui-fang Yang Wen Ma Yu Bai
• 机 构: College of Materials Science and Engineering Inner Mongolia University of Technology, Hohhot, Inner
• 出 处: 第十一届全国表面工程大会暨第八届全国青年表面工程学术会议
• 发表日期: 2016年4期
• 关键词: 6061 alumin m alloy micro-arc oxidation colloidal particle corrosion resistanc

　　In this work, to investigate the effect of colloidal particle on formation and properties of micro-arc oxidation coating on 6061 alumin m alloy, we adopted Na2SiO3+NaOH+Na2EDTA (refer to A) and Na2SiO3+ NaOH+Na2EDTA+C3H8O3 (refer to B) as electrolytes. The results indicates that the colloid particles are refined and maintained stable between 4.30nm-16.68nm by adding moderate C3H8O3. The growth rate of coating is decreased significantly after 10 min, and is decreased to 0.82μm/min at 15 min. Especially, at the time of 20 min, 25 min and 30 min, the oxide particles are refined and maintained to 100μm-200μm. At the time of 20 min, corrosion current density of coating formed in B electrolyte is reached to a min mum value of 1.92×10-5 A/cm2 and corrosion potential is reached to a maximum value of -0.395V. But corrosion current density and corrosion potential of coating formed in A electrolyte were 1.37×10-2 A/cm2 and -1.145V. The refining of colloid particle size is made the corrosion current density decreasing three orders of magnitude, tremendously improving the corrosion resistance of coating.