Self-healing and corrosion-sensing multifunctional coatings containing pH-sensitive TiO2-based composites

Yangyang Cao; Zheng Wang; Jieru Wan; Yuzhu He; Yunqiang Li; Sheng Wang; Yanli Wang; Dalei Song; Tao Zhang

doi:10.1016/j.jcis.2024.05.041

Self-healing and corrosion-sensing multifunctional coatings containing pH-sensitive TiO₂-based composites

J Colloid Interface Sci. 2024 Sep:669:912-926. doi: 10.1016/j.jcis.2024.05.041. Epub 2024 May 8.

Authors

Yangyang Cao¹, Zheng Wang¹, Jieru Wan¹, Yuzhu He¹, Yunqiang Li¹, Sheng Wang¹, Yanli Wang², Dalei Song¹, Tao Zhang¹

Affiliations

¹ Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China.
² Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China. Electronic address: yanliwang@hrbeu.edu.cn.

PMID: 38754144
DOI: 10.1016/j.jcis.2024.05.041

Abstract

Polyelectrolyte-encapsulated nanocontainers can effectively respond to changes of pH and thus control the on-demand release of corrosion inhibitors. A pH-responsive release system (Phen-Tpp@MTNs-PDDA) was developed based on the cationic polyelectrolyte poly dimethyl diallyl ammonium chloride (PDDA) encapsulated mesoporous TiO₂ nanocontainers (MTNs) loaded with 1,10-phenanthroline (Phen) and tripolyphosphate ions (Tpp) corrosion inhibitors. The epoxy coating (EP) embedded with Phen-Tpp@MTNs-PDDA (Phen-Tpp@MTNs-PDDA/EP) demonstrates superior self-healing properties and confers long-term protection on the metal substrate through the cooperative effect of Phen and Tpp. Simultaneously, this hybrid coating is endowed with corrosion sensing capability based on the color development originating from the interaction of Phen and carbon steel. This self-healing and corrosion-sensing multifunctional coating provides an effective strategy for the corrosion protection of metals.

Keywords: Coating; Corrosion protection; Corrosion sensing; Mesoporous TiO(2); Self-healing.