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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Influence of current density on microstructure and properties of electrodeposited nickel-alumina composite coatings
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Influence of current density on microstructure and properties of electrodeposited nickel-alumina composite coatings

机译：电流密度对电沉积镍铝复合涂层组织和性能的影响

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Electrodeposition process is a very promising method for producing metal matrix composites reinforced with ceramic particles. In this method insoluble particles suspended in an electrolytic bath are embedded in a growing metal layer. This paper is focused on the investigations of the nickel matrix nanocomposite coatings with hard α-Al_2O_3 nano-particles, electrochemically deposited from modified Watts-type baths on steel substrates. The influence of various current densities on the microstructure, residual stresses, texture, hardness and corrosion resistance of the deposited nickel/alumina coatings was investigated. The surface morphology, cross sections of the coatings and distribution of the ceramic particles in the metal matrix were examined by scanning electron microscopy. The phase composition, residual stresses and preferred grain orientation of the coatings were characterized using X-ray diffraction techniques. The coating morphology revealed that α-Al_2O_3 particles show a distinct tendency to form agglomerates, approximately uniformly distributed into the nickel matrix.
机译：电沉积工艺是生产用陶瓷颗粒增强的金属基复合材料的非常有前途的方法。在这种方法中，悬浮在电解浴中的不溶性颗粒被嵌入正在生长的金属层中。本文着重研究具有硬质α-Al_2O_3纳米颗粒的镍基纳米复合涂层，这些涂层是从改性Watts型镀液中电化学沉积在钢基材上的。研究了各种电流密度对沉积的镍/氧化铝涂层的微观结构，残余应力，织构，硬度和耐蚀性的影响。通过扫描电子显微镜检查表面形态，涂层的横截面以及陶瓷颗粒在金属基质中的分布。使用X射线衍射技术表征了涂层的相组成，残余应力和优选的晶粒取向。涂层的形貌表明，α-Al_2O_3颗粒表现出明显的附聚趋势，大致均匀地分布在镍基体中。

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