TY  - JOUR
AU  - Ma, Jirui
AU  - Lu, Xiaopeng
AU  - Zhou, Yuxin
AU  - Ai, Zhengrong
AU  - Hao, Yuquan
AU  - Wang, Qiang
AU  - Gnedenkov, Andrey S.
AU  - Wang, Fuhui
PY  - 2025
TI  - Self-healing coatings on Mg-Li alloy using pH-responsive sepiolite microcontainer loaded with corrosion inhibitors
JO  - Journal of Magnesium and Alloys
SN  - 2213-9567
SP  - 5511
EP  - 5524
VL  - 13
IS  - 11
AB  - To enhance the corrosion resistance of Mg-Li alloy, a composite coating system integrating plasma electrolytic oxidation (PEO) with solgel sealing treatment is developed. Two functionalized sepiolite microcontainers (sepiolite-Ce and sepiolite-BA) are constructed by loading cerium ions (Ce3+) via ion exchange and encapsulating barbituric acid (BA) through low-pressure impregnation. The microcontainers are subsequently incorporated into the coating surface through controlled sol-gel deposition process. UV-Vis and ICP-OES analyses reveal that both functionalized sepiolite microcontainers exhibited pH-responsive release characteristics under alkaline conditions. Electrochemical impedance spectroscopy (EIS) tests demonstrate that the inhibitor-containing composite coating has excellent long-term corrosion resistance and self-healing performance. After 240 h of immersion in a 0.5 wt.% NaCl solution, the low-frequency impedance modulus of the composite coating is four orders of magnitude higher than that of the pristine coating.
UR  - https://doi.org/10.1016/j.jma.2025.09.011
DO  - 10.1016/j.jma.2025.09.011