Sol-Gel-Derived Ni3Al Coating on Nickel Alloy for Oxidation Resistance in Supercritical Water Environments

Yuelong Pan; Zhidong Zhang; Daoyuan Wang; Hao Guo; Qiwu Shi; Tiecheng Lu

doi:10.3390/ma15196566

Sol-Gel-Derived Ni₃Al Coating on Nickel Alloy for Oxidation Resistance in Supercritical Water Environments

Materials (Basel). 2022 Sep 22;15(19):6566. doi: 10.3390/ma15196566.

Authors

Yuelong Pan¹, Zhidong Zhang¹, Daoyuan Wang², Hao Guo³, Qiwu Shi², Tiecheng Lu³

Affiliations

¹ China Nuclear Power Engineering Co., Ltd., Shenzhen 518124, China.
² College of Materials Science and Engineering, Sichuan University, Chengdu 610064, China.
³ College of Physics, Sichuan University, Chengdu 610064, China.

Abstract

Although nickel-based alloys are widely used in industries due to their oxidation and corrosion resistance, the pursuit of better performance in harsh environments is still a great challenge. In this work, we developed a sol-gel method to synthesize Ni₃Al coating on a nickel alloy, assisted by a post-annealing process, and investigated the oxidation-resistant performance. The coating thickness can be controlled by designing the deposition times, which keep the pure Ni₃Al phase stable. In addition, the surface morphologies indicate that the coating is compact without obvious voids or cracks. Furthermore, the oxidation-resistant property of the coating was investigated by carrying out a supercritical water oxidation experiment. The crystalline structure and surface morphology of the samples before and after 72-h oxidation demonstrated the superior oxidation resistance of the coating. This work provides a convenient method to fabricate an oxidation-resistant coating on a nickel-based alloy, which would be significant for prolonging the service life of vessels under oxidation conditions, especially for supercritical water reactions.

Keywords: Ni3Al coating; nickel alloy; oxidation resistance; sol–gel; supercritical water reaction.

Grants and funding

This work was financially supported by the National Key R&D program of China (No. 2018YFB1900202) and the Fundamental Research Funds for Central Universities.