Wear and corrosion resistance of Co–P coatings: the effects of current modes

Abstract

The P content in the Co–P coatings increased in the sequence of DC, PC and PRC methods. The PRC Co–P coating has better wear and corrosion resistance than DC and PC Co–P coatings.

Electrodeposition of Co-P Coatings Reinforced by MoS2 + Y2O3 Hybrid Ceramic Nanoparticles for Corrosion-Resistant Applications: Influences of Operational Parameters

“…Moreover, the formed small pyramidal grains in the microstructure of this deposit can give rise to surface roughness. Apart from the effects of embedded reinforcements on the R a of Co-P deposits, Li et al [40] indicated that the employed current mode can significantly alter the R a of Co-P coatings. While the pulse reverse current (PRC) provides the highest R a , the surface roughness of coatings obtained by a direct current (DC) is the lowest.…”

“…Therefore, if the aim was to assess the corrosion performance of a deposit, the influences of other factors should also be taken into account; (3) surface roughness; higher surface roughness degrades the corrosion behavior of a coating. Published papers in this field have showed better corrosion behavior of Co-P coatings with a smooth surface than of those with higher roughness because of the greater heterogeneity of the rougher surface facilitating the corrosion attacks [17,40] ; (4) matrix characteristics; this factor becomes more pronounced when using alloy matrix composite coatings such as Ni-P and Co-P. In these coating systems, the amount of phosphorous can markedly change the corrosion properties.…”

“…[28][29][30][31][32][33][34][35][36][37][38][39] To date, several research works have been carried out to improve the final characteristics of Co-P alloy coatings by controlling the operational parameters, including current modes, electrolyte pH, current density, etc., as well as the application of post-heat treatments. [6,7,24,[40][41][42][43][44] Notably, most of the aforementioned works have addressed the tribomechanical properties of the Co-P deposits, while the corrosion behavior of the deposits has been less often discussed. To date, a few studies have focused on the assessment of the effects of reinforcing agents on the performance of Co-P deposits.…”

Biocompatible Co–P Metallic Glasses with Superior Degradation Tolerance in Physiological Environments

“…Electrodeposition is a facile process for obtaining MG coatings that is attractive because of its simplicity, rapid deposition rate, cost-effectiveness, low-temperature operation, and tuning of composition with enhanced surface properties. − Here, biocompatible Co–P metallic glass coatings were synthesized by a facile electrodeposition approach, and their tribological behavior was evaluated in a simulated physiological environment. There are several studies on the microstructure and wear behavior of Co–P alloys with varying phosphorus content. − However, there are no reports related to their biocompatibility and performance in a physiological environment. Here, we systematically investigated the tribological response, mechanical properties, and biocompatibility of Co 100– x P x ( x = 10 and 20 at.…”

Effects of heat treatment on the properties of Co–P–TiO2 nanocomposite coatings

“…The electrodeposition technique has been accepted as an effective and efficient method to prepare Co-P coating and to regulate the coating performance. The physicochemical properties of electrodeposited Co-P coatings therefore have been studied by many researchers [5][6][7]. For instance, Kosta et al comparatively investigated the electrodeposited Co-P coating and EHC coating, obtaining a homogenous coating with the encouraging corrosion resistance of Co-P coatings [4].…”