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Corrosive wear characteristics of bronze friction resisting composites

机译:青铜耐摩擦复合材料的腐蚀磨损特性

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摘要

Three groups of bronze based composites with different amounts of slide additive (graphite) and friction additives (SiC and SiO_2) were prepared by powder metallurgy technique. The corrosive wear behaviours of the resulting composites in electrochemical aqueous solutions, namely, acidic rain, neutral rain and wastewater, were comparatively investigated. The corrosive wear mechanisms of the bronze composites were discussed based on examination of the worn surface morphologies of the composite block materials by means of scanning electron microscopy equipped with an energy dispersion spectrometry. The determination of corrosive wear rates was carried out by means of a combination of electrochemical and gravimetric techniques. Increasing both slide and friction additives improved the corrosion resistance of these bronze composites. Samples with 1.5% graphite, 3%SiO_2 and 3%SiC had the highest corrosive wear resistance in neutralised as well as in acid rain due to the high amount of antifriction and slide additives, in addition to low porosity.
机译:采用粉末冶金技术制备了三组不同含量的滑动添加剂(石墨)和摩擦添加剂(SiC和SiO_2)的青铜基复合材料。比较研究了所得复合材料在电化学水溶液中的腐蚀磨损行为,即酸性雨水,中性雨水和废水。基于装备有能量色散谱仪的扫描电子显微镜对复合块材料的磨损表面形态进行了研究,讨论了青铜复合材料的腐蚀磨损机理。腐蚀磨损率的测定是通过电化学和重量分析技术的结合进行的。增加滑动添加剂和摩擦添加剂可改善这些青铜复合材料的耐腐蚀性。含有1.5%石墨,3%SiO_2和3%SiC的样品在中和以及酸雨中具有最高的耐腐蚀性,这是因为除低孔隙率外,还含有大量的减摩和滑动添加剂。

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