摘要
为了提高环保型阳极氧化膜的耐蚀性,以氨基乙酸为添加剂,制取镁合金阳极氧化膜。用扫描电子显微镜(SEM)和金相显微镜(OM)观察阳极氧化膜的表面及截面形貌,采用极化曲线(Tafel)和电化学交流阻抗谱(EIS)等电化学方法,检测和评价了镁合金阳极氧化膜的耐蚀性。结果表明:随着氨基乙酸浓度的升高,阳极氧化膜表面趋于平整,孔洞变小,膜表面微观形貌更加连续致密;与不添加氨基乙酸所形成的氧化膜相比,添加了氨基乙酸形成的阳极氧化膜的自腐蚀电位正移,自腐蚀电流变小;当氨基乙酸加入量为7.5g/L时氧化膜的耐蚀性最优,自腐蚀电流密度为1.18×10-7A/cm2。
Anodizing coating was prepared on magnesi-um alloy by electrodeposition with aminoacetic acid as an addi-tive.The surface and cross-section morphologies of the anodizing coating were observed by using a scanning electron microscope and an optical microscope.The corrosion resistance of the anodicoxide coating was evaluated by measurement of polarization curves (Tafel) and electrochemical impedance spectra.Results show that the anodizing coating prepared on Mg alloy in the presence ofaminoacetic acid is uniform,smooth and compact.Compared to the anodizing coating obtained in the absence of aminoacetic acid,that obtained in the presence of aminoacetic acid had positivelyshifted corrosion potential and smaller corrosion current.In parti-cular,the anodizing coating prepared in the presence of 7.5 g/L aminoacetic acid,with a corrosion current of 1.18×10-7A/cm2,showed the best corrosion resistance.
出处
《材料保护》
CAS
CSCD
北大核心
2010年第2期50-52,60,共4页
Materials Protection
关键词
镁合金
阳极氧化膜
氨基乙酸
形貌
性能
magnesium alloy
anodizing coating
aminoaceticacid
morphologies
properties
