Abstract
In order to improve the wear and corrosion resistance of micro-arc oxidation (MAO) coating on a Ti-5Al-1V-1Sn-1Zr-0.8Mo alloy, 0–0.20 g/L graphene was added to the electrolyte to prepare micro-arc oxidation coating. The thickness, roughness, micro-morphology, and composition of the MAO coating were characterized, and the wear and corrosion resistance of the coating was tested and analyzed. The results show that with 0.05 g/L of graphene in the electrolyte, the roughness of the coating decreased from 56.76 μm to 31.81 μm. With the increase in the addition of graphene, the microstructure of the coating became more compact, the diameter of micro-holes and micro-cracks decreased, and the corrosion resistance of the coating improved. The wear tests showed that the mass loss of the coating at the early wear stage (0~100 revolutions) was greater than that at the later stage (100~250 revolutions), and the wear resistance of the coating obtained by the addition of 0.10 g/L of graphene was the highest. With 0.10 g/L of graphene, the adhesion force between the coating and the substrate alloy is the largest, reaching 57.1 N, which is 9.98 N higher than that without graphene. After salt spray corrosion for 480 h, the coating with graphene has better corrosion resistance than that of a graphene-free coating.
Highlights
It can be observed that the thickness of the Micro-arc oxidation (MAO) coating increased with the increase in the graphene addition
The MAO coating is formed by the molten substrate alloy during micro-arc discharge and by contacting the electrolyte and cooling
S0, both the and area of the pitcoating surfaces of S1–S4to were thatnumber the corrosion resistance of the coating was improved with graphene in the electrolyte
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The substrate alloy is melted by the micro-arc and solidified by the electrolyte During this process, the conductivity of the electrolyte and composition of the coating is changed, which means that the performance of the coating is changed. Composite coatings are prepared by adding the nano-particles (such as ZrO2 , and graphene) into the electrolytes to improve the density, hardness, corrosion, and wear resistance of the coatings [12,13,14,15,16,17]. According to the filling and sealing effect of graphene on the micro holes of MAO coatings, graphene has been shown to be effective in the micro-arc oxidation of other metals It is rarely used as an additive in the micro-arc oxidation of titanium alloys, especially of the Ti-5Al-1V-1Sn-1Zr-0.8Mo alloy. The influence of graphene on the morphology, wear resistance, and corrosion resistance of the coating was studied
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