Effect of Surface Treatment on Wear and Corrosion Resistance of Zr-Sn-Nb Alloy

Zr-Sn-Nb alloy tubes were treated by shot peening and micro-arc oxidation. Microhardness tester, fretting wear device and static autoclave were used to evaluate the microhardness, wear resistance and corrosion resistance of the samples before and after surface treatment. The results show that, compared with the untreated Zr-Sn-Nb alloy matrix samples, shot peening and micro-arc oxidation treatment increased the surface microhardness of the samples by 15% and 60%, and reduced the wear volume by 6% and 65%, respectively. And after surface treatment, the corrosion resistance of the samples in 360 ℃/18.6 MPa deionized water and 360 ℃/18.6 MPa/0.01 mol/L LiOH aqueous solution was also improved. Micro-arc oxidation was more effective than shot peening in improving the hardness, wear resistance as well as concurrent corrosion resistance of Zr-Sn-Nb alloy.