Lignin/graphene oxide composite coating loaded with zinc ions and its photothermal conversion and self-healing anticorrosion properties

• DOI: 10.20517/microstructures.2024.186
• Publication Date: 2025-04-11T09:22:04Z
• Authors: Chang-An Xu; Wenzi Liang; Peiping Hong; Yang Hu; Zhuohong Yang; Hao Pang
• Keywords: Conversion coating

At present, using biomass materials to modify graphene oxide (GO) enhance the anticorrosion performance of coatings meets requirements future sustainable development. In order endow lignin/GO with self-healing function reduce maintenance costs and avoid accidents caused by material corrosion failure, this work utilized electrostatic interactions load zinc ions onto (Zn@LGO). Experimental results indicated that cured coating exhibited both photothermal conversion properties. When content Zn@LGO was 0.4 wt%, surface temperature rose 139.2 °C after 180 s near-infrared radiation. The left for 100 days in salt water, Z0.01Hz value VER-3 up 1.3 × 109 Ω cm2, which two orders magnitude higher than pure resin coating, fewer products were observed on metal surface. scratch test showed damaged soaked 3.5 wt% sodium chloride 72 h; charge transfer impedance 2.61 104 one coating. This mainly because during corrosion, hydroxide generated combination at cathode covered area hindering penetration corrosive medium. All all, research promoted application lignin, also provided a reference design composite