Effects of cavitation erosion-induced surface damage on the corrosion behaviour of TA31 Ti alloy

Liang Li; Yanxin Qiao; Lianmin Zhang; Chengtao Li; Zhong Liu; Rongyao Ma; Lanlan Yang; Jingyong Li; Yugui Zheng

doi:10.1016/j.ultsonch.2023.106498

Effects of cavitation erosion-induced surface damage on the corrosion behaviour of TA31 Ti alloy

Ultrason Sonochem. 2023 Aug:98:106498. doi: 10.1016/j.ultsonch.2023.106498. Epub 2023 Jun 21.

Authors

Liang Li¹, Yanxin Qiao², Lianmin Zhang³, Chengtao Li⁴, Zhong Liu⁴, Rongyao Ma⁵, Lanlan Yang⁶, Jingyong Li⁷, Yugui Zheng⁵

Affiliations

¹ School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China; CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.
² School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China. Electronic address: [email protected].
³ CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China. Electronic address: [email protected].
⁴ Suzhou Nuclear Power Research Institute, Suzhou 215004, China.
⁵ CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.
⁶ School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China.
⁷ School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China. Electronic address: [email protected].

Abstract

This study used electrochemical noise technology to analyse the effects of surface damage induced by cavitation erosion (CE) on the pitting and passivation behaviours of TA31 Ti alloy. According to the results, TA31 Ti alloy exhibited high corrosion resistance in NaCl solutions. However, the residual tensile stress layer generated during grinding and polishing reduced its passivation ability. Subsequently, the residual tensile stress layer was eliminated after CE for 1 h, improving the passivation ability of the material. Thereafter, pitting corrosion was initiated on the material surface. Increasing the CE time from 1 h to 2 h gradually decreased the passivation ability of the alloy. A large number of CE holes promoted the transition from pitting initiation to metastable pitting growth. which gradually dominated the surface of TA31 Ti alloy. The damage mechanism of uniform thinning increased the passivation ability and stability of the alloy with the increase in CE time from 2 h to 6 h. Therefore, the surface of TA31 Ti alloy was dominated by the initiation of pitting corrosion.

Keywords: Cavitation erosion; Electrochemical noise; Surface damage; Ti alloy.