Electroless nickel–phosphorus plating on WC–Co powders using HVOF feedstock

Abstract

In this study, electroless nickel-phosphorus plating was optimised for WC-Co powder using different bath loads and then subjected to a high-velocity oxygen fuel process. The produced Ni-P-coated WC-12Co powders were subsequently used as HVOF feedstock materials. Based on the SEM results, an increase in the bath load resulted in a decrease in the thickness of the Ni-P coating formed on the WC-12Co powders. Moreover, applying the HVOF process led to a lower porosity and roughness and a higher thickness of nickel coating, whereas applying a suitable thickness of this coating can prevent the destructive W 2 C phase. Finally, a bath load of 16 g L -1 was determined as the optimum value to achieve a proper thickness of the Ni-P, extremely low porosity (0.3%), good surface roughness (5 μm), and high microhardness (1112 Hv) in the produced coating.

Effect of alkali cleaning for Ni-P-based metallic glass coating on bearing surface

“…Flis and Duquette reported beneficial as well as detrimental effect of coating depending upon the amount of 'P' content in it. It is reported that a microcrystalline phase and amorphous phase or a co-existence of these two phases can be obtained depending on the 'P' content [21,[23][24][25][26][27]. Amorphous Ni-P alloy film has a better corrosion resistance than their crystalline counterpart [28,29].…”

Electroless Ni-P-MoS2-Al2O3 Composite Coating with Hard and Self-Lubricating Properties

“…Of all the available alloys, Al-7075 occupies a vital place in the designing and manufacturing of aerospace components [ 4 , 5 , 6 ]. However, they are prone to high-stress corrosion cracking that fails in high-stress concentration regions, such as riveted zones in airplanes [ 7 , 8 ]. Therefore, improving the performance of the Al-7075 surface in terms of mechanical, corrosion, and tribological properties is essential.…”

“…As per a study by Gutierrez et al, the corrosion resistance of the Ni-P EL-coated component depends upon the P content, the extent of internal stress, and the amorphous state [ 22 ]. The performance evaluation of Ni-P coated surfaces has been conducted in the context of the factors mentioned above in several studies [ 8 , 9 , 10 ]. Vlaic et al demonstrated that amorphous coatings possess high corrosion resistance and low hardness due to surface flaws and the absence of grain boundaries [ 23 ].…”

Effect of chromium–titanium on corrosion and erosion of HVOF coating

“…However, the high-velocity oxyfuel thermal spray coating process exhibits dense, thick, hard, and smooth coating, better corrosion resistance, strong adhesion to substrate materials, etc. High-density coating, good mechanical properties, and excellent corrosion resistance were obtained owing to HVOF coating by various researchers in the literature [1][2][3][4][5][6].…”