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Roles of growth mechanisms of Ni deposits on corrosion behaviors of Ni-xAl-yTi composite coatings

机译：Ni沉积物的生长机理对Ni-xAl-yTi复合涂层腐蚀行为的影响

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摘要

To evaluate the influences of the conducive and nonconductive particles on the microstructures and properties of the Ni based composite coatings, various weight ratios of Al and Ti particles (Al/Ti ratios) were co-electrodeposited into Ni deposits to synthesize Ni-xAl-yTi composite coatings (x, y in weight percent). The microstructure and corrosion behaviors of the Ni-xAl-yTi coatings were investigated comprehensively. Results showed that an amorphous alumina layer was formed on the surface of the Al particle and led to the nonconducive behavior of the Al particle. The nonconductive Al particle and conducive Ti particle contributed to the different growth mechanisms of Ni deposits (surrounding growth mechanism and direct growth mechanism), consequently causing the decrease of crystallite size and [200] crystallographic orientation of the Ni deposits with decreasing Al/Ti ratio. In corrosion experiments, the XPS analysis showed that Al2O3, TiO2 and Ni(OH)(2) together appeared in the coatings, causing a changing trend of decrease, increase and decrease of corrosion resistance of the Ni-xAl-yTi coatings with decreasing Al/Ti ratio. The best corrosion resistance of the coating was obtained at Al/Ti ratio of 1/2. The different growth mechanisms could account for the corrosion behavior evolutions of the Ni-xAl-yTi coatings with various Al/Ti ratios.
机译：为了评估导电性和非导电性颗粒对Ni基复合涂层的微观结构和性能的影响，将各种重量比的Al和Ti颗粒（Al / Ti比）共电沉积到Ni沉积物中以合成Ni-xAl-yTi复合涂料（x，y的重量百分比）。全面研究了Ni-xAl-yTi涂层的组织和腐蚀行为。结果表明，在Al颗粒的表面上形成了非晶态氧化铝层，并导致了Al颗粒的非导电行为。非导电性的Al颗粒和有益的Ti颗粒有助于Ni沉积物的不同生长机制（周围生长机制和直接生长机制），因此随着Al / Ti比的降低，导致Ni沉积物的晶粒尺寸减小和[200]晶体学取向的降低。在腐蚀实验中，XPS分析表明，Al2O3，TiO2和Ni（OH）（2）一起出现在涂层中，随着Al的减少，导致Ni-xAl-yTi涂层的耐蚀性下降，增加和降低的变化趋势。 / Ti比。在Al / Ti比为1/2时，可获得最佳的涂层耐腐蚀性。不同的生长机理可以解释具有各种Al / Ti比的Ni-xAl-yTi涂层的腐蚀行为演变。

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