Study of pitting corrosion inhibition effect on aluminum alloy in seawater by biomineralized film

Yuanyuan Shen; Yaohua Dong; Yi Yang; Qinghong Li; Hongling Zhu; Wenting Zhang; Lihua Dong; Yansheng Yin

doi:10.1016/j.bioelechem.2019.107408

Study of pitting corrosion inhibition effect on aluminum alloy in seawater by biomineralized film

Bioelectrochemistry. 2020 Apr:132:107408. doi: 10.1016/j.bioelechem.2019.107408. Epub 2019 Nov 15.

Authors

Yuanyuan Shen¹, Yaohua Dong², Yi Yang¹, Qinghong Li¹, Hongling Zhu¹, Wenting Zhang¹, Lihua Dong¹, Yansheng Yin¹

Affiliations

¹ Institute of Marine Materials Science and Engineering, College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China.
² Institute of Marine Materials Science and Engineering, College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China; School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China. Electronic address: yhdong@shmtu.edu.cn.

PMID: 31816577
DOI: 10.1016/j.bioelechem.2019.107408

Abstract

Metallic materials can be easily corroded in marine environments, in which pitting corrosion is very common. In this study, we investigated the effect of Bacillus subtilis, isolated from the South China Sea on the corrosion behavior of 2A14 aluminum alloy in seawater. Surface analysis of the alloy in the presence of the bacteria was used to observe corrosion morphology and the corrosion products studied. Electrochemical method was used to analyze the corrosion susceptibility of the alloy in seawater in the presence of the bacteria. Surface analysis suggested that a protective film with CaMg(CO₃)₂ was gradually formed on the surface of the alloy in the presence of the bacteria. The electrochemical results showed that the radius of the impedance arc of the alloy immersed in seawater with bacteria increased gradually with time. The bacteria promoted the formation of the CaMg(CO₃)₂ film, which blocked seawater from the alloy and consequently, inhibited pitting corrosion.

Keywords: Aluminum alloy; Biomineralized film; Electrochemical impedance; Pitting corrosion inhibition; Seawater.

MeSH terms

Alloys / chemistry
Alloys / pharmacology*
Aluminum / chemistry
Aluminum / pharmacology*
Bacillus subtilis / drug effects*
Biofilms*
Corrosion*
Microscopy, Electron, Scanning
Seawater*
Spectrometry, X-Ray Emission
X-Ray Diffraction

Substances

Alloys
Aluminum