电解液成分在ZAlSi12Cu2Mg1微弧氧化膜形成中的作用  

Effects of Electrolyte Proportion on MAO(Micro-arc Oxidation) Ceramic Coating on ZAlSi12Cu2Mg1 Alloy

作　　者：刘彩文[1] 刘向东[1] 吕凯[1] 乌迪[1] 

机构地区：[1]内蒙古工业大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2008年第9期725-727,共3页Special Casting & Nonferrous Alloys

摘　　要：在电解液组成为Na2SiO3、Na2WO4、NaOH、丙三醇和Na2EDTA下,对ZAlSi12Cu2Mg1微弧氧化陶瓷膜的形成进行研究,通过改变每种成分的含量,研究了其对微弧氧化的临界起弧电压、稳定氧化时间、陶瓷膜层生长速率和陶瓷膜层硬度的影响,并分析其作用原理。结果表明,Na2SiO3和NaOH可极大地促进膜层生长,Na2WO4提高膜层硬度,NaOH能降低临界起弧电压,丙三醇和Na2EDTA均可延长稳定氧化时间并改善微弧氧化的稳定性,通过观察陶瓷膜表面与截面形貌,发现丙三醇和Na2EDTA同时作用可细化膜层陶瓷颗粒,改善膜层与基体的结合,并显著提高陶瓷层的耐磨性。The formation of MAO ceramic coating on ZAlSi12Cu2Mg1 alloy was observed in electrolyte which is composed of NaSiO3,Na2WO4,NaOH,glycerin and Na2EDTA. Effects of different proportions on critical arc starting voltage,stable oxidation time,the forming rate and hardness of coating were analyzed. The results show that NaSiO3 and NaOH can evidently promote the formation of coating,and the Na2WO4 can improve the hardness of coating. Meanwhile,NaOH can decrease the critical arc-starting voltage,and glycerin and Na2EDTA can increase stable oxidation time and improve the stability of MAO. Microstructural observation reveal that the wear resistance of the ceramic coating can be evidently improved in glycerin and Na2EDTA electrolyte as a result of refining ceramic particle in coating and improving the bonding condition of coating and matrix alloy.

关 键 词：电解液成分 ZAISil2Cu2Mgl 微弧氧化 陶瓷膜 

分 类 号：TF812[冶金工程—有色金属冶金]