Abstract
In this study, a grit-blasting pretreatment was used to improve the adhesion, corrosion resistance and microhardness of Ni-W/SiC nanocomposite coatings fabricated using the conventional electrodeposition technique. Prior to deposition, grit blasting and polishing (more commonly used) pretreatments were used to prepare the surface of the substrate and the 3D morphology of the pretreated substrates was characterized using laser scanning confocal microscopy. The coating surface and the cross-section morphology were analyzed using scanning electron microscopy (SEM). The chemical composition, crystalline structure, microhardness, adhesion and corrosion behavior of the deposited coatings were characterized using energy-dispersive spectroscopy (EDS), X-ray diffraction (XRD), a microhardness tester, a scratch tester and an electrochemical workstation, respectively. The results indicated that the grit blasting and SiC addition improved the microhardness, adhesion and corrosion resistance. The Ni-W/SiC nanocomposites pretreated by grit blasting exhibited the best adhesion strength, up to 36.5 ± 0.75 N. Its hardness was the highest and increased up to 673 ± 5.47 Hv and its corrosion resistance was the highest compared to the one pretreated by polishing.
Highlights
The 45 steel is characterized by a good combination of mechanical properties as well as having low price in the market
The results show that the grit-blasting pretreatment could impart a rough appearance on the 45 steel surface
While the mean square root roughness values were 0.0057 ± 0.0007 μm, and 1.4237 ± 0.410 μm, respectively, suggesting the enhanced effect of the grit blasting treatment on the surface roughness. Considering these different results, it appears that the surface roughness could be significantly increased Crystals 2021, 11, x FOR PEER REVIEWby the use of a grit-blasting pretreatment
Summary
The 45 steel is characterized by a good combination of mechanical properties as well as having low price in the market. In addition to the metal or alloy matrix, nanoparticles can be added to the coating so as to improve its mechanical and corrosion properties [13,14,15,16,17] For this reason, many researchers have worked on Ni-W nanocomposite coatings and some studies have presented the performance of the incorporation of different nanoparticles in this binary alloy. Many researchers have worked on Ni-W nanocomposite coatings and some studies have presented the performance of the incorporation of different nanoparticles in this binary alloy One of these nanoparticles, SiC, due to its high purity, small particle size and stable chemical properties, was used as second-phase reinforcing particles in a composite to improve the corrosion resistance, wear resistance and microhardness of the deposited coatings [18]. To the best of the authors’ knowledge, this research has not been undertaken before
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