氨三乙酸对镁合金复合阳极氧化膜的影响
Effects of Nitrilotriacetic acid on properties of composite anodizing films on magnesium alloy
王敬,王勇
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作者单位:1.重庆广播电视大学汽车工程学院,2.重庆大学材料科学与工程学院,3.重庆电子工程职业学院汽车工程系
中文关键字:氨三乙酸、阳极氧化、镁合金、极化曲线
英文关键字:NTA, anodic oxidation, magnesium alloy, polarization curves
中文摘要: 采用阳极氧化的方法在AZ31镁合金表面制备包含Al2O3纳米颗粒的复合阳极氧化膜,研究了氨三乙酸(NTA)对复合阳极氧化膜的影响。分别利用涡流测厚仪、扫描电子显微镜、电化学工作站依次对复合氧化膜进行厚度测量、形貌观察、极化曲线分析。结果显示,氨三乙酸参与了阳极氧化过程,并改变击穿电压,适量氨三乙酸能有效降低氧化膜的孔隙率和增加氧化膜厚度。且氨三乙酸的添加量在0.04 mol/L时,复合阳极氧化膜耐蚀性相对最优,氧化膜的自腐蚀电位高达-0.84 V,自腐蚀电流密度降低了了3个数量级。
英文摘要: Composite anodizing coating containing superfine Al2O3 are prepared on AZ31 magnesium alloy by anodic oxidation device. The effects of Nitrilotriacetic acid on properties of composite anodizing films on magnesium alloy are studied by eddy current thickness tester, scanning electron microscope and electrochemical workstation, the thickness of composite anodizing coatings, micro morphology and polarization curves are discussed, respectively. The results show that NTA can participate in the coating formation and increase the breakdown voltage. Appropriate amount of nitrilotriacetic acid can effectively reduce the porosity of films and increase the thickness of films. The Ecorr of composite anodizing films with 0.04 mol/L NTA is up to -0.84V, the corrosion current density decreases by 3 orders of magnitude, which shows better corrosion resistance.