Development of a thiophene derivative modified LDH coating for Mg alloy corrosion protection.

Li, Lin-Xin; Xie, Zhi-Hui; Fernandez, Carlos; Wu, Liang; Cheng, Daojian; Jiang, Xiao-Hui; Zhong, Chuan-Jian

Abstract

A new thiophene derivative corrosion inhibitor (CI) was developed to functionalize the layered double hydroxide (LDH) primer on Mg alloy to enhance corrosion protection. Compared with bare LDH coating, the composite coatings consisting of a MgAl-LDH primer and an outer CI layer showed highly compact surface structures without large pores and gaps, thereby indicating the enhanced capability to resist the penetration of corrosive species. Electrochemical tests revealed that the MgAl-LDH film modified with the newly synthesized CI exhibited higher charge transfer resistance and lower corrosion current density than films modified with commercial CIs. The highest enhancement in corrosion resistance was linked to the film's ability to repair physical damage by forming precipitates through chemical complexation and adsorption of the CIs. These findings open up new opportunities for the design and synthesis of a thiophene-contained inhibitor to modify LDH films and to obtain a composite coating with superior corrosion protection.

Citation

LI, L.-X., XIE, Z.-H., FERNANDEZ, C., WU, L., CHENG, D., JIANG, X.-H. and ZHONG, C.-J. 2020. Development of a thiophene derivative modified LDH coating for Mg alloy corrosion protection. Electrochimica acta [online], 330, article ID 135186. Available from: https://doi.org/10.1016/j.electacta.2019.135186

• Journal Article Type: Article
• Acceptance Date: Oct 31, 2019
• Online Publication Date: Nov 3, 2019
• Publication Date: Jan 10, 2020
• Deposit Date: Nov 8, 2019
• Publicly Available Date: Nov 4, 2020
• Journal: Electrochimica Acta
• Print ISSN: 0013-4686
• Electronic ISSN: 1873-3859
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 330
• Article Number: 135186
• DOI: https://doi.org/10.1016/j.electacta.2019.135186
• Keywords: Mg alloy; Corrosion; Coating; Layered double hydroxide
• Public URL: https://rgu-repository.worktribe.com/output/744220