J. Mater. Sci. Technol. ›› 2021, Vol. 71: 177-185.DOI: 10.1016/j.jmst.2020.07.022

• Research Article • Previous Articles     Next Articles

Synergistic effect of chloride ion and Shewanella algae accelerates the corrosion of Ti-6Al-4V alloy

Zhong Lia,c, Jie Wanga,c, Yizhe Donga,c, Dake Xua,c,*(), Xianhui Zhangb,d, Jianhua Wub,d,**(), Tingyue Gue, Fuhui Wanga,c   

  1. a Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China
    b Fujian Province Key Laboratory of Naval Architecture and Marine Engineering, Xiamen 361021, China
    c Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
    d School of Marine Engineering, Jimei University, Xiamen 361021, China
    e Department of Chemical and Biomolecular Engineering, Institute for Corrosion and Multiphase Technology, Ohio University, Athens, OH 45701, USA
  • Received:2020-04-26 Revised:2020-06-25 Accepted:2020-07-03 Published:2021-04-30 Online:2021-04-30
  • Contact: Dake Xu,Jianhua Wu
  • About author:** Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China. E-mail addresses: wujh@jmu.edu.cn (J. Wu).
    * Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China. E-mail addresses: xudake@mail.neu.edu.cn (D. Xu)

Abstract:

The increasing utilization of titanium alloys in marine environments makes their microbiologically influenced corrosion study a timely matter. This work demonstrated that the corrosion of Ti-6Al-4 V alloy was accelerated by a marine bacterium Shewanella algae in 2216E medium with different Cl- level. Various electrochemical, pitting morphology and passive film analyses demonstrated that S. algae weakened the passive film, which made Cl- more aggressive. The synergy of those two factors caused considerable corrosion acceleration of the titanium alloy, leading to a maximum pit depth of 3.2 μm and corrosion current density of 26.5 nA cm-2 in 2216E medium with 3.50 % (w/w) Cl-.

Key words: Titanium alloy, Microbiologically influenced corrosion, Chloride ions, Biofilm, Passive film