A lactoglobulin-composite self-healing coating for Mg alloys.

Feng, Jiawen; Pan, Yukun; Yang, Meng; Fernandez, Carlos; Chen, Xiaobo; Peng, Qiuming

Abstract

Corrosion issue is one of the most crucial bottlenecks for extensive employment of Mg alloys, in particular under harsh engineering conditions. Differing from traditional approaches, a self-healing protective coating composed of lactoglobulin is proposed herein to offer sustainable protection to the underlying Mg parts. Corrosion resistance, evaluated by electrochemical measurements and hydrogen evolution tests, indicates that the lactoglobulin composite film exhibits nobler corrosion potential (−1.28 VSCE), smaller corrosion current density (8.4 × 10−6 A/cm2), and lower average corrosion rate (~0.03 mm/y) than those of its bare counterparts. Moreover, the pre-made cracks in the film were evidently self-healed within 24h of exposure to corrosive media. The proposed self-healing lactoglobulin composite film provides opportunities to tackle the corrosion challenges of Mg alloys.

Citation

FENG, J., PAN, Y., YANG, M., FERNANDEZ, C., CHEN, X. and PENG, Q. 2021. A lactoglobulin-composite self-healing coating for Mg alloys. ACS applied bio materials [online], 4(9), pages 6843-6852. Available from: https://doi.org/10.1021/acsabm.1c00560

• Journal Article Type: Article
• Acceptance Date: Aug 20, 2021
• Online Publication Date: Aug 31, 2021
• Publication Date: Sep 20, 2021
• Deposit Date: Oct 4, 2021
• Publicly Available Date: Sep 1, 2022
• Journal: ACS Applied Bio Materials
• Print ISSN: 2576-6422
• Electronic ISSN: 2576-6422
• Publisher: American Chemical Society
• Peer Reviewed: Not Peer Reviewed
• Volume: 4
• Issue: 9
• Pages: 6843-6852
• DOI: https://doi.org/10.1021/acsabm.1c00560
• Keywords: Magnesium alloy; β-lactoglobulin; Coating; Corrosion properties; Self-healing
• Public URL: https://rgu-repository.worktribe.com/output/1457291