A study on corrosion behavior of micro-arc oxidation coatings doped with 2-aminobenzimidazole loaded halloysite nanotubes on AZ31 magnesium alloys

• Published in: Surface & coatings technology Vol. 416; p. 127116
• Main Authors: Wu, W.X., Wang, W.P., Lin, H.C.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 25-06-2021; Elsevier BV
• Subjects: 2-aminobenzimidazole; Aminobenzimidazole; Corrosion; Corrosion effects; Corrosion inhibitor; Corrosion inhibitors; Corrosion potential; Corrosion resistance; Corrosion resistant alloys; Corrosion tests; Halloysite nanotube; Magnesium base alloys; Micro-arc oxidation; Nanotubes; Oxidation; Protective coatings; Salt spray tests; Self healing materials; 2-aminobenzimidazole; Halloysite nanotube; Micro-arc oxidation; Corrosion inhibitor
• ISSN: 0257-8972; 1879-3347
• DOI: 10.1016/j.surfcoat.2021.127116

Micro-Arc oxidation (MAO) coatings with actively protective functionality by incorporating 2-aminobenzimidazole (2-ABi) loaded halloysite nanotubes (HNTs) was presented. The coatings were characterized by SEM, EDX and XRD. Corrosion behavior was evaluated by EIS, PDP and salt spray test. With the SEM and EDX analysis, the existence of HNT or 2ABi-loaded HNT was confirmed. The OCP evolution, EIS complex spectra and the result of salt spray test showed the enhanced corrosion resistance of 2-ABi-HNT MAO coating owing to the self-healing effect, suggesting 2-ABi has good potential as corrosion inhibitor for Mg alloys.
•Several characteristics on three different kinds of MAO coatings on Mg alloys were simultaneously presented and compared.•2-ABi molecules were successfully loaded into the HNTand the 2-ABi-HNT-MAO films showed higher corrosion resistance.•Confirm that 2-ABi has a good self-healing function and has a long-term protective effect on MAO coatings.