Abstract
By contrast with the traditional method of adding hard particles into micro arc oxidation (MAO) coating to improve its wear performance, this study introduced copper into the MAO coating on TC4 alloy by adding copper pyrophosphate to enhance the wear property in a marine environment and the antibacterial property. The results demonstrated that the MAO coating with copper pyrophosphate addition showed a porous structure, and Cu was mainly concentrated around micropores. CuO and Cu2O were formed in this MAO coating. This MAO coating with Cu had a high bonding strength to the substrate. Although the hardness of the coating with Cu had been reduced, it could reduce the friction coefficient and enhance the wear property in simulated seawater due to the lubrication of Cu. Furthermore, this MAO coating with Cu addition had obvious antibacterial and bactericidal effects due to the antibacterial effect of Cu.
Highlights
TC4 titanium alloy has been used in many fields due to its excellent comprehensive properties [1,2,3,4]
We have revealed the effect of copper pyrophosphate concentration on friction performance of micro arc oxidation (MAO) coating of TC4 alloy, and found that the designed coatings have excellent anti-wear property in simulated seawater
(10 g/L), and compared with the TC4 substrate and the MAO coating without Cu, the microstructure, adhesion, mechanical property, wear resistance in the simulated seawater and antibacterial property of the MAO coating with Cu doping were systematically studied
Summary
TC4 titanium alloy has been used in many fields due to its excellent comprehensive properties [1,2,3,4]. As the MAO-coated titanium components work in the seawater, they were subjected to erosion due to the porous structure of the coating surface [17] Some hard granules such as Si3 N4 [18], ZrO2 [19], AlN [20], or Al2 O3 [21] are added to reduce the friction coefficient and improve wear performance of the MAO coatings. In the marine environment, titanium components need to withstand corrosion and wear, and need to have an antibacterial property At present, it is difficult for the prepared MAO coatings on titanium alloys to meet the collaborative improvement of protection and antifouling performance. We have revealed the effect of copper pyrophosphate concentration on friction performance of MAO coating of TC4 alloy, and found that the designed coatings have excellent anti-wear property in simulated seawater. In this paper, based on the above research results, the concentration of copper pyrophosphate was further increased (10 g/L), and compared with the TC4 substrate and the MAO coating without Cu, the microstructure, adhesion, mechanical property, wear resistance in the simulated seawater and antibacterial property of the MAO coating with Cu doping were systematically studied
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