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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Hard and corrosion resistant nanocomposite coating for Al alloy
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Hard and corrosion resistant nanocomposite coating for Al alloy

机译：铝合金硬质耐腐蚀纳米复合涂层

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摘要

Ni-TiO_2 nanocomposite coatings were prepared by codeposition of Ni and nanoparticles of TiO_2 powder onto surface of Al alloy. The influences of the TiO_2 nano-particulates concentration and current density on the composition of nanocomposite coatings were investigated. The chemical composition and phase structure of coatings were studied by X-ray diffractometer (XRD) and energy dispersive X-ray system (EDX). The microhardness and erosive wear measurements (in 40 wt.% sand slurry) for pure Ni and Ni-TiO_2 composite coatings were evaluated. The corrosion behavior of Ni and Ni-TiO_2 nanocomposite coatings was studied by the anodic polarization curves in 3.5% NaCl solution at room temperature. Ni-TiO_2 composite coatings exhibited higher corrosion resistances in comparison with pure Ni coating. The morphologies of the coated, eroded and corroded surfaces of pure Ni and Ni-TiO_2 composite coatings were observed using SEM. The results reveal TiO_2 nanparticles were uniformly distributed into Ni matrix and significantly improve the microhardness and erosion wear properties of the Ni coating.
机译：通过将Ni和TiO_2粉末的纳米粒子共沉积到铝合金表面制备Ni-TiO_2纳米复合涂层。研究了TiO_2纳米颗粒浓度和电流密度对纳米复合涂层组成的影响。通过X射线衍射仪（XRD）和能量色散X射线系统（EDX）研究了涂层的化学组成和相结构。评价了纯Ni和Ni-TiO_2复合涂层的显微硬度和侵蚀磨损测量（在40 wt。％的砂浆中）。通过室温下3.5％NaCl溶液中的阳极极化曲线研究了Ni和Ni-TiO_2纳米复合涂层的腐蚀行为。与纯Ni涂层相比，Ni-TiO_2复合涂层具有更高的耐腐蚀性。用SEM观察了纯Ni和Ni-TiO_2复合镀层的涂层，腐蚀和腐蚀表面的形貌。结果表明，TiO_2纳米粒子均匀分布在Ni基体中，显着提高了Ni涂层的显微硬度和冲蚀磨损性能。

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