期刊
PROGRESS IN ORGANIC COATINGS
卷 170, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2022.106966
关键词
Mg alloy; Superhydrophobicity; Self-healing; Anticorrosion; Inhibition effect
资金
- National Natural Science Foundation of China [51872245, 52103269]
- Fok Ying-Tong Education Foundation of China [161044]
- Natural Science Foundation of Gansu Province, China [20JR10RA106]
- Scientific and Technical Innovation Project of Northwest Normal University [NWNU-LKQN2019-26]
- Gansu International Scientific and Technological Cooperation Base of Water-Retention Chemical Functional Materials
A superhydrophobic coating with corrosion inhibition and self-healing properties was developed to protect magnesium alloy from corrosion. The coating showed outstanding long-lasting anticorrosion performance, excellent abrasion resistance, and chemical stability.
Magnesium (Mg) and its alloys are susceptible to corrosion, which affects their large-scale applications. The traditional superhydrophobic coatings for corrosion protection of Mg substrates are particularly fragile and easily damaged after prolonged exposure to harsh conditions. Herein, a superhydrophobic ODA/PDA/APT-Ce3+ (OPACe3+) coating with corrosion inhibition and self-healing properties was proposed to prevent corrosion of Mg alloy via combining the cerium nitrate loaded attapulgite (APT), polydopamine (PDA) and octadecylamine (ODA). Once the OPA-Ce3+ coating was corroded, the Ce3+ adsorbed by the APT were released to form insoluble cerium oxide and hydroxides, thereby inhibiting the penetration of the corrosive substance and preventing further occurrence of corrosion. Furthermore, the OPA-Ce3+ coating exhibited favorable self-healing ability against chemical damage, which could recover its superhydrophobicity under solar exposure after O2 plasma etching. The impedance modulus (|Z|0.01 Hz) of OPA-Ce3+ coating was about 3 orders of magnitude higher than that of Mg substrate after being exposed to 3.5 wt% NaCl solution for 15 days, showing outstanding long-lasting anticorrosion performance. Moreover, the abrasion resistance and chemical stability of the as-fabricated coating were also excellent. This work is expected to provide a new perspective for preparing cost-effective and durable anticorrosion coating on metal substrates.
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