低温超音速喷涂原态沉积高铝青铜涂层的耐腐蚀性能

发布时间：2019-06-05 06:27

【摘要】：为提高HSn62-1铜合金表面抗点蚀能力,解决高铝青铜涂层制备过程中相变和氧化造成涂层耐腐蚀性能降低的问题,采用低温超音速喷涂技术,在HSn62-1铜合金表面制备不含γ2相的高铝青铜涂层。利用场发射扫描电镜(SEM)、电子能谱仪(EDS)、X射线衍射仪等分析粉末和涂层的组织结构、表/截面形貌等特征;利用电化学工作站、盐雾腐蚀试验箱等测定分析Na Cl溶液环境中涂层及基体的耐腐蚀性能及失效机制。结果表明:制备的高铝青铜涂层结构致密,结合良好,无γ2相和氧化夹杂生成,涂层腐蚀敏感性均一;涂层自腐蚀电流密度为6.938μA/cm2,较HSn62-1铜合金基体降低了1个数量级,涂层自身具有较好的耐腐蚀性能,可有效阻挡腐蚀介质向涂层更深处渗入;盐雾环境中,高铝青铜涂层表面腐蚀产物薄膜反复地剥落和生成使其腐蚀失效机制宏观上表现为均匀腐蚀。
[Abstract]:In order to improve the pitting corrosion resistance of HSn62-1 copper alloy surface and solve the problem of decreasing corrosion resistance caused by phase transformation and oxidation in the preparation process of high aluminum bronze coating, low temperature supersonic spraying technology was adopted. High aluminum bronze coating without 纬 2 phase was prepared on the surface of HSn62-1 copper alloy. The microstructure and surface / cross section morphology of the powder and coating were analyzed by field emission scanning electron microscope (SEM),) electron spectrometer (EDS), X-ray diffractometer. The corrosion resistance and failure mechanism of coating and substrate in Na Cl solution environment were measured and analyzed by electrochemical workstation and salt spray corrosion test chamber. The results show that the high aluminum bronze coating has dense structure, good bonding, no 纬 2 phase and oxidation inclusion, and the corrosion sensitivity of the coating is uniform. The self-corrosion current density of the coating is 6.938 渭 A / cm2, which is one order of magnitude lower than that of HSn62-1 copper alloy substrate. The coating has better corrosion resistance and can effectively prevent the corrosion medium from infiltrating deeper into the coating. In salt spray environment, the corrosion product film on the surface of high aluminum bronze coating is repeatedly peeled off and formed, which makes the corrosion failure mechanism of high aluminum bronze coating appear uniform corrosion macroscopically.
【作者单位】：装甲兵工程学院再制造技术重点实验室;
【基金】：国家国际科技合作专项(2015DFG51920) 国家自然科学基金(51375493) 中国博士后科学基金(2012M512125,2014T71020)~~
【分类号】：TG174.442

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