Application Progress of Layered Double Hydroxides-Based Self-Healing Coatings in Marine Environment

Abstract

The harsh marine environment makes anti-corrosion a technical problem in marine engineering.In order to improve the service life of marine anticorrosive coatings， the development of intelligent anticorrosive coatings with "active healing" self-repairing function has become a research hotspot.Layered double hydroxides (LDHs) are ideal corrosion inhibitor nanocontainers and chloride ion hardeners due to their unique structure and anion exchange properties.With excellent environmentally responsive self-healing corrosion resistance and mature construction technology， LDHs have been widely used in marine anti-corrosion engineering.In this paper， the structural properties and synthesis methods of LDHs materials and the preparation of LDHs based coatings were reviewed.The applications of LDHs as additive in organic coatings and pre-treatment conversion films in marine environment for metal protection (magnesium alloy， aluminum alloy and steel) and concrete protection in recent years were summarized.In view of the complex problems encountered in the actual service of the coating，the shortcomings and challenges in the research of LDHs materials were put forward， and the future research trend of LDHs materials in the marine environment was forecasted.

Keywords

• layered double hydroxides-based coatings； marine corrosion； self-repairing； application