等离子体电解氧化
腐蚀
材料科学
电解质
镁合金
阳极氧化
扫描电子显微镜
极化(电化学)
涂层
表面粗糙度
镁
合金
冶金
化学工程
盐雾试验
电流密度
复合材料
化学
铝
物理
电极
物理化学
量子力学
工程类
作者
Pan S,Xiaohua Tu,Jianxing Yu,Yang Zhang,Chengping Miao,Yaling Xu,Rui Fu,Jiayou Li
出处
期刊:Coatings
[Multidisciplinary Digital Publishing Institute]
日期:2022-04-24
卷期号:12 (5): 578-578
被引量:7
标识
DOI:10.3390/coatings12050578
摘要
The optimization of NaOH-Na2SiO3-Na2B4O7 electrolyte for the plasma electrolytic oxidation of AZ31B magnesium alloy was investigated through orthogonal tests. The properties of the anodized films were evaluated by film thickness, roughness measurements, salt spray tests, scanning electron microscopy (SEM), X-ray diffraction (XRD) and potentiodynamic polarization tests, respectively. The orthogonal tests revealed that the optimal formulation of the electrolyte comprised NaOH 45 g/L, Na2SiO3 50 g/L, and Na2B4O7 90 g/L. NaOH exhibited the most significant effect on film thickness, while Na2SiO3 had the greatest effect on corrosion resistance. Moreover, the optimal electrical parameters were also obtained with the values of current density 1 A /dm2, oxidation time 15 min, pulse frequency 200 Hz and duty cycle of 10%. The surface morphology of the anodized coating formed under optimal conditions was uniform and compact. Furthermore, the phase compositions of all samples were mainly composed of MgO and Mg2SiO4. The corrosion potential, corrosion current density and polarization resistance of the prepared coating by plasma electrolytic oxidation improved remarkably compared with that of the substrate.
科研通智能强力驱动
Strongly Powered by AbleSci AI