Bioinspired layered hybrid coatings with greatly enhanced barrier effect and active corrosion protection performance

Micro/nanosheets filled polymer coating for corrosion protection of metals has garnered considerable attention due to their outstanding barrier properties. Achieving uniformly dispersed nanocomposites coating with multifunctionality remains an important challenge, however. Herein, a nacre-inspired layered hybrid coating based on layered double hydroxide (LDH) nanoplatelets and polyvinyl butyral (PVB) combining excellent barrier effect and active corrosion protection performance for mild steel is reported. The excellent barrier performance is due to the uniform nacre-like layered structures and the good active corrosion protection performance attributed to the stimuli-responsive released corrosion inhibitor (MoO42-) from LDH to forms a compact precipitate layer at the exposed metal substrate, to prevent the aggressive medium from further erosion. This work provides a promising approach to combine excellent barrier effect with active corrosion protection properties to fabricate high-performance anticorrosion coatings.