Abstract
Type 45 steel substrate surfaces were coated with Ni–Co–P alloy coatings using jet electrodeposition in varying reciprocating sweep speed and jet gap to improve the wear and seawater polarization resistance of the substrate surface. The properties of the deposited coatings were analyzed and characterized. The results showed that the morphologies of the cross-section, thickness, and chemical composition of coatings were affected by reciprocating sweep speed and jet gap variation. At a reciprocating sweep speed of 175 mm·s−1 coupled with a jet gap of 2.0 mm, the content of Co element in the deposit attained the highest value of 47.66 wt.%. Reciprocating sweep speed and jet gap variation exhibited no significant influence on either the phase structure or the peak intensities of deposited Ni–Co–P coatings, but an obvious preferred orientation was evident in the (111) plane. Further increase in reciprocating sweep speed and jet gap caused an initial increase in the microhardness of Ni–Co–P alloy coatings followed by a decrease, where the highest value attained was 635 HV0.1. At a jet gap of 2.0 mm and a reciprocating sweep speed of 175 mm·s−1, Ni–Co–P alloy coatings reached a minimum wear scar width value of 460 µm. Electrochemical tests showed that the seawater corrosion resistance of coatings exhibited an observable change with increased reciprocating sweep speed and jet gap. The Ni–Co–P alloy coatings exhibited the highest polarization resistance (Rp) of 28.32 kΩ·cm−2 when the reciprocating sweep speed was 175 mm·s−1 and the jet gap was 2.0 mm, which indicated that the coatings had better seawater corrosion resistance.
Highlights
Materials form a key pillar in industrial engineering technology
45 steel substrates were coated with Ni–Co–P alloy coatings using jet electrodeposition with varying reciprocating sweep speeds and jet gaps so as to enhance the seawater polarization resistance and wear resistance of metals
It is evident that the average thickness of the coating increased with the increase in reciprocating sweep speed reaching a value of 37.5 μm at 275 mm·s−1
Summary
Materials form a key pillar in industrial engineering technology. There is a constant threat of wear and corrosion phenomena that seriously degrade the properties of equipment leading to reduced production capacity and increased maintenance costs. It is critical to develop mitigation measures against these phenomena. Coatings 2020, 10, 924 enhancement techniques have been employed to mitigate the negative effects of wear and corrosion on the surfaces of metallic coatings. Such techniques include: powder metallurgy, thermospraying, and electrodeposition. These techniques have allowed the synthesis of entirely new engineering materials that exhibit superior properties
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