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研究AM60B镁合金表面复合涂层的应用,该涂层由铈-钒转化膜和混合溶胶-凝胶层组成。扫描电镜和X射线能谱分析显示铈-钒转化膜存在开裂结节结构,该转化膜由氧、铈、钒和镁原子组成。转化膜中的裂纹被致密无缺陷的混合溶胶-凝胶薄膜密封。在Harrison溶液中进行电位极化和电化学阻抗测试,结果表明铈-钒转化膜对镁合金提供了很小的防腐保护,然而复合涂层显著增大了镁合金的抗腐蚀性。通过密封铈-钒转化膜的裂缝,溶胶-凝胶膜对合金防护和阻碍腐蚀起到了很大的作用。极化测试后采用扫描电子显微镜验证了电化学测试结果。
Study AM60B magnesium alloy surface composite coating application, the coating by the cerium - vanadium conversion film and mixed sol - gel layer composition. Scanning electron microscopy and X-ray energy dispersive spectroscopy showed that there was a cracked nodular structure in the cerium-vanadium conversion film, which consisted of oxygen, cerium, vanadium and magnesium atoms. Cracks in the conversion coating are sealed by a dense and defect-free mixed sol-gel film. Potential polarization and electrochemical impedance measurements in Harrison’s solution showed that the cerium-vanadium conversion coating provided little corrosion protection to the magnesium alloy, whereas the composite coating significantly increased the corrosion resistance of the magnesium alloy. By sealing the cracks in the cerium-vanadium conversion film, the sol-gel film plays a significant role in the protection of the alloy and in the inhibition of corrosion. Electrochemical test results were confirmed by scanning electron microscopy after the polarization test.