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Developing levodopa-modified sol-gel coating with enhanced anticorrosion performance on Mg alloy AZ31.

Authors :
Li, Jiao
Li, Tianshu
Yuwono, Jodie A.
Meng, Guozhe
Feng, Zhiyuan
Source :
Anti-Corrosion Methods & Materials. 2023, Vol. 70 Issue 3, p129-138. 10p.
Publication Year :
2023

Abstract

Purpose: This study aims to develop a sol-gel-based coating to provide a long-lasting corrosion protection on AZ31 Mg alloy. Silane-based sol-gel coatings have been successfully applied to Mg alloys for corrosion protection. However, the micro or nano defects formed during condensation and solidification will cause the coating failure during a long-lasting immersion in a saline solution. More durable corrosion-protective sol-gel coatings are needed. Design/methodology/approach: A sol-gel-based coating was modified on AZ31 Mg alloy by levodopa (DOPA). The long-lasting corrosion protection mechanism was studied by multiple electrochemical testing methods and surface characterization techniques. Findings: Long-term testing by electrochemical impedance spectroscopy in aqueous 0.1 M NaCl indicated that the modified DOPA@sol-gel coating exhibited significant corrosion protection performance (>14 days). In comparison, the DOPA-free sol-gel coating failed only after three days of testing. The improved corrosion protection is attributed to the self-polymerized DOPA filling to the micro or nano defects in the glassy cross-linked networks of the sol-gel coating, which greatly improves the compactness of the coating. Originality/value: The method of this study is simple and easy to process, the raw materials are green and the protective effect is excellent, which is of significance for the study of magnesium alloy corrosion protection. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00035599
Volume :
70
Issue :
3
Database :
Academic Search Index
Journal :
Anti-Corrosion Methods & Materials
Publication Type :
Academic Journal
Accession number :
163000850
Full Text :
https://doi.org/10.1108/ACMM-03-2023-2765