Journal
CORROSION SCIENCE
Volume 192, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2021.109840
Keywords
Magnesium; Corrosion reaction; Layered double hydroxides; Anti-corrosion; Self-healing
Funding
- National Natural Science Foundation of China [31771044, 51901239]
- Shanghai Committee of Science and Technology, China [19JC1415500, 20S31901200]
- High-end Entrepreneurial and Innovative Teams of Ningbo High-level Talents Project [2018A-09-C]
- S&T Innovation 2025 Major Special Programme of Ningbo [2020Z095]
- S&T Industrial Programme of Cixi [2019gy01]
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A novel smart chemical strategy using amorphous MnOOH is proposed to regulate the corrosion reaction and reinforce the plasma electrolytic oxidation (PEO) coating on magnesium, providing both physical shielding and chemical active healing abilities. The MnOOH film reacts with corrosion products to enhance long-term anti-corrosion performance, while also displaying self-healing ability for scratches and defects on coated films.
Herein, a novel smart chemical strategy for regulating the corrosion reaction to reinforce the plasma electrolytic oxidation (PEO) coating on magnesium by amorphous MnOOH is proposed. The MnOOH film could provide PEO coating with both physical shielding and chemical active healing abilities. During corrosion process, MnOOH spontaneously reacts with the corrosion-produced Mg2+ and OH- to form layered double hydroxides, resulting in high improvement of the long-term anti-corrosion of PEO coating. Moreover, the PEO/MnOOH coating presented a certain self-healing ability for scratches, and could be used for repairing corrosion defects on further coated films.
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