Abstract
Ni-Co alloy and ZrO2 micron particles were codeposited on 45 carbon steel by electrodeposition. The composition and microstructure of the composite coating were characterized. The high temperature tribological properties were carried out by a pin-on-disk tribo-tester. Additionally, the oxidation resistance was evaluated via high temperature circulating oxidation test. The results indicated that the deposited composite coating showed dispersed ZrO2 particles and continuous Ni-Co matrix, and there were no obvious pores, cracks and other defects at the interface between the composite coating and the substrate. The embedded ZrO2 particles changed the friction mechanism from adhesive wear to abrasive wear, the wear loss rate and friction coefficient of Ni-Co-ZrO2 composite coating were lower in comparison with that of Ni-Co alloy coating and carbon steel substrate. In addition, the embedded ZrO2 particles exerted a reactive-phase effect on the growth of nickel oxide and cobalt oxide, and effectively reduced the oxidation rate of the substrate at high temperature. Therefore, the Ni-Co-ZrO2 composite coating presents better oxidation resistance, when compared with Ni-Co coating.
Highlights
Carbon steels are widely used as a structural material for a variety of engineering applications
Carbon steels are easy to suffer an attack in aggressive solutions and atmospheres because of its high corrosion and oxidation rate 1
ZrO2 is commonly used as the second ceramic phase due to its high hardness, low thermal conductivity and high temperature oxidation resistance
Summary
Carbon steels are widely used as a structural material for a variety of engineering applications. The prolonged life and reduced cost of die is achieved by the use of the anti-wear materials in high temperature environments 2. In order to improve the wear, corrosion and high temperature oxidation resistance of carbon steels, surface strengthening techniques are still needed to increase the service life and reliability and to improve the performance and quality of mechanical equipment. ZrO2 is commonly used as the second ceramic phase due to its high hardness, low thermal conductivity and high temperature oxidation resistance. Ni-Co alloys are important as they possess high temperature wear and corrosion resistance because it is hardened by the addition of cobalt (Co) into nickel (Ni) in a form of solid solution which does not
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