采用等离子喷涂工艺在高锰铝青铜基体上制备了 Al2O3-13%TiO2和 Cr2O3•5SiO2•3TiO2两种耐冲< 蚀复合涂层，利用扫描电子显微镜(SEM)、激光扫描显微镜 (LSM)等手段观察分析了两种涂层的组织形貌，测试了两种涂层的显微硬度和结合强度，用电化学测量和失重测量分别研究了两种涂层在3.5%NaCl溶液中的电化学行为以及耐海水冲刷腐蚀性能。结果表明，Cr2O3•5SiO2•3TiO2 涂层组织致密，无明显层状结构；陶瓷涂层在3.5%NaCl溶液中的电化学腐蚀行为主要取决于涂层的孔隙率；Cr2O3• 5SiO2•3TiO2涂层试样在动态海水中的冲刷腐蚀失重约为基体试样的1/9，表现出较Al2O3-13%TiO2涂层更优异的耐海水冲刷腐蚀性能。
Al2O3-13%TiO2 and Cr2O3•5SiO2•3TiO2 erosion-resistant ceramic coatings were deposited on Al-bronze alloy using plasma spraying process. The morphologies of the two coatings were investigated by means of scanning electron microscope (SEM) and laser scanning microscope (LSM). Microhardness and adhesion strength have been evaluated, respectively. The corrosion behavior of two coatings in 3.5% NaCl solution were characterized by potentiodynamic polarization and electrochemical impedance spectroscopy. SEM analysis of corroded surface and weight loss technique were used to study the erosion-corrosion of coated samples and uncoated sample in flowing seawater. The results indicated that Cr2O3•5SiO2•3TiO2 coating has a much dense microstructure and the laminar microstructure was not obviously observed. The corrosion behavior of ceramic coatings was mainly related to the porosity of the coatings. Due to higher microhardness and adhesion strength, the weight loss of Cr2O3•5SiO2•3TiO2 coated sample was nearly 1/9 of that of uncoated one, indicating better resistance to erosion-corrosion in flowing seawater than Al2O3-13%TiO2 coating.
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