Hard and Corrosion-Resistant Ni- x Al- y Ti Nanocomposite Coatings for CNT/Al Composites
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JMEPEG DOI: 10.1007/s11665-017-2707-6
Hard and Corrosion-Resistant Ni-xAl-yTi Nanocomposite Coatings for CNT/Al Composites Yuantao Zhao, Chengxi Wang, Lianbo Wang, Zhou Xu, and Chuanhai Jiang (Submitted January 10, 2017; in revised form April 15, 2017) The ternary Ni-xAl-yTi (x, y in wt.%) nanocomposite protective coatings were electroplated on carbon nanotubes (CNT)/Al composite by the co-deposition of Al and Ti particles at several current densities. The dependences of microstructure, microhardness, residual stress, and corrosion resistance of the ternary nanocomposite coating on current density were investigated. The results showed that the embedded Al and Ti particles caused the crystallite refinement and the decrease of [200] fiber texture of nanocrystalline Ni matrix when current density decreased. The microstructure evolution endowed the ternary nanocomposite coating with high microhardness and corrosion resistance. The surface residual stress of the ternary nanocomposite coating increased with decreasing current density. Keywords
composites, corrosion, electroplating, microhardness, microstructure, residual stress
1. Introduction The composites of aluminum reinforced with carbon nanotubes (CNTs) in recent decades have sparked extensive scientific, technological, and commercial interests, due to high specific strength and stiffness of CNTs reinforcement (Ref 1-5). The potential CNT/Al composite can be extensively used in fields of high-speed transportation and electronic and military devices. Although CNT/Al composites possess lots of merits, the dissatisfactory surface hardness and low resistance to localized corrosion, which was caused by discontinuous surface oxides and intergranular corrosion, would decrease the possible industrial applications. In recent decades, the attempts to optimize the surface hardness and corrosion resistance of Al matrix composites were explored (Ref 6-8). Satisfactorily, electroplating technique provided a convenient and low cost route for the fabrication of protective coating on the Al matrix composites, which would be effective in optimizing the surface property of CNT/Al composites. The researches proved that the electroplated Niparticle composite coatings were fully capable of improving surface property of substrate parts (Ref 9-13). The electroplated Ni-Al and Ni-Ti composite coatings were produced, which possessed satisfactory hardness and corrosion resistance (Ref 10, 11). Specifically, as potential multiduty materials due to the diversified constitutions, the electroplated ternary Ni matrix composite coatings were also developed quite recently, such as Ni-xCr-yAl and Ni-xW-ySi (x, y in weight percent) (Ref 12, 13), exhibiting the more novel and multiplying physical and
Yuantao Zhao, Chengxi Wang, Lianbo Wang, Zhou Xu, and Chuanhai Jiang, School of Materials Science and Engineering, Shanghai Jiao Tong University, No. 800 Dongchuan Road, Shanghai 200240, Peoples Republic of China. Contact e-mail: [email protected].
Journal of Materials Engineering and Performance
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