Electroless Codeposition of Ni-P Composite Coatings: Effects of Graphene and TiO 2 on the Morphology, Corrosion, and Tri
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INTRODUCTION
BECAUSE of their excellent wear and corrosion resistance, high hardness, and thickness uniformity, Ni-P electroless codepositions are well-known protective coatings and have been widely applied in many areas, such as the automobile, petroleum/chemical, marine, and computer industries.[1–3] Furthermore, electroless Ni-P deposition is an important method for improving the chemical and physical properties of materials due to an autocatalytic reduction process. To improve the corrosion and wear properties of Ni-P coatings, many studies have focused on Ni-P composites, such as Ni-P-ceramic particles and Ni-P-carbonaceous materials.[4–7] For example, Karthikeyan et al.[8] reported that a Ni-P-Al2O3 composite deposition showed better mechanical properties than those of the unreinforced Ni-P deposition. The tribological properties of MEHMET UYSAL is with the Department of Metallurgy and Materials Engineering, Faculty of Engineering, Sakarya University, 54187 Sakarya, Turkey and also with the Development and Application Center (SARGEM), Sakarya University Research, Esentepe Campus, 54187 Sakarya, Turkey. Contact e-mail: [email protected] Manuscript submitted September 17, 2018.
METALLURGICAL AND MATERIALS TRANSACTIONS A
Ni-P-CNT composite coatings were investigated by Chen et al.[9] They found that the introduction of CNTs in the electroless Ni-P coatings resulted in a significant increase in the wear resistance. Tamilarasan et al.[10] studied a Ni-P-GO composite coating synthesized by electroless deposition and found that the addition of graphene into a Ni-P matrix can enhance the wear properties of Ni-P alloys due to the lubrication effect of graphene. Ni-P-graphene oxide (GO) composite coatings prepared by Huihui et al.[11] showed excellent mechanical properties and microhardness because of the use of graphene oxide as reinforcement material. Rong et al. reported[12] that Ni-P-Al2O3 composite coating prepared by electroless deposition obtained better corrosion and tribology properties compared with the Ni-P alloy coating. Soleimani et al. suggested[13] that the addition of SiC into the Ni-P matrix provides wear and corrosion properties for the Ni-P coatings. Mostafa et al. reported[14] the Ni-P-CNT composite coating prepared by the electroless deposition method. They found that the incorporation of CNTs provided tribological properties for the Ni-P-CNT composite coatings. Shilong[15] also found that the Ni-P-Si3N4 composite coating had better mechanical and corrosion properties than those of coatings with the unreinforced Ni deposition. However, there are very few reports about the effects of two-dimensional materials and ceramic particles in the Ni matrix.
Excellent properties, such as the high thermal conductivity, chemical inertness, chemical stability, good tribological behavior, and high surface area of graphene, which are two-dimensional carbon sheets consisting of sp2-bonded carbon atoms with different oxygenated functional groups, have recently attracted tremendous scientific attention and technol
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