Dual self-healing inorganic-organic hybrid coating on biomedical Mg. (15th May 2022)

• Record Type: Journal Article
• Authors: Dong, Qiangsheng; Dai, Jianwei; Qian, Kun; Liu, Huan; Zhou, Xingxing; Yao, Qingqiang; Lu, Mengmeng; Chu, Chenglin; Xue, Feng; Bai, Jing
• Is Part Of: Corrosion science. Volume 200(2022)
• Publication Date: 2022-05-15
• Subjects: Magnesium -- Corrosion -- Hybrid coating -- Dual self-healing; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2022.110230
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: Local corrosion of coated Mg alloys appears as aggressive solutions penetrate the coating-substrate interface, which might accelerate the premature failure of coated Mg alloys. In this work, Mg corrosion by-products, including pH increase and Mg 2+ enrichment, were attempted to act as dual stimuli for coating self-healing. We prepared DCPD/H x Phy (dicalcium phosphate dihydrate/phytic acid) hybrid coating as anti-corrosive self-healing coatings for regulating Mg degradation. pH increase stimulated Ca 2+ and PO4 3- ion release from DCPD and apatite formation for local corrosion elimination. Besides, H x Phy-containing compounds were regulated by Mg 2+ ion enrichment and transformed into Mg-H x Phy chelate compounds for enhanced self-healing behavior. Graphical Abstract: ga1 Highlights: Mg corrosion by-products (pH increase and Mg 2+ enrichment) were acted as dual stimuli. DCPD/H x Phy coatings were prepared on Mg as anti-corrosive self-healing coatings. pH increase stimulated DCPD dissolution and promoted apatite formations. Mg 2+ ion enrichment promoted Mg-H x Phy chelate for enhanced self-healing.