LY12铝合金微弧氧化黑色陶瓷膜层组构及耐磨性能

发布时间：2018-03-01 04:35

本文关键词： 铝合金微弧氧化陶瓷膜摩擦磨损三氧化铬　出处：《白城师范学院学报》2016年11期 　论文类型：期刊论文

【摘要】：在多聚磷酸钠和三氧化铬组成的电解液体系中,采用微弧氧化方法在LY12铝合金表面制备黑色陶瓷膜.结果表明:随反应时间的延长,膜层颜色由浅至深最后形成均匀的黑色,厚度逐渐增加且趋于缓慢,硬度增大;膜层由致密层和疏松层构成,表面残留大量未完全封闭的放电通道;膜层由大量的α-Al_2O_3及少量的γ-Al_2O_3组成,而在单一的多聚磷酸钠电解液中,膜层由γ-Al_2O_3组成,三氧化铬能促进γ-Al_2O_3向α-Al_2O_3转化和黑色膜层的形成.随三氧化铬浓度的增加,膜层磨损率上升后略有下降,摩擦系数下降后略有上升;随载荷和转数的增加,膜层磨损率升高,摩擦系数减少.
[Abstract]:Black ceramic film was prepared on the surface of LY12 aluminum alloy by micro-arc oxidation in electrolyte system composed of sodium polyphosphate and chromium trioxide. The results showed that the color of the film changed from shallow to deep to form uniform black with the increase of reaction time. The thickness increases gradually and tends to slow, the hardness increases; the film is composed of dense layer and loose layer, and a large number of incomplete discharge channels remain on the surface; the film layer consists of a large number of 伪 -Al _ 2O _ 3 and a small amount of 纬 -Al _ 2O _ 3, while in a single electrolyte of sodium polyphosphate, the film is composed of a large number of 伪 -Al _ 2O _ 3 and a small amount of 纬 -Al _ 2O _ 3. The film consists of 纬 -Al2O3. Chromium trioxide can promote the conversion of 纬 -Al2O3 to 伪 -Al2O3 and the formation of black film. With the increase of Cr _ 2O _ 3 concentration, the wear rate of the film increases slightly, and the friction coefficient decreases slightly, and with the increase of load and rotation, The wear rate of the film increases and the friction coefficient decreases.
【作者单位】：白城师范学院化学学院;哈尔滨工业大学化学化工学院;
【基金】：吉林省科技厅项目(20100546) 吉林省2015年大学生创新创业项目“镁合金陶瓷涂层的制备工艺及耐腐蚀性”
【分类号】：TG174.4

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