Enhancement of barrier and corrosion protection performance of epoxy coatings through adding eco‐friendly lamellar biochar

Abstract Biomass, as a green and renewable energy source, can be procured from a broad range of sources and is low in cost. The full exploitation of biomass could reduce the dependence on and consumption of fossil fuels, and is conducive to the protection of the environment. The prevention of corrosion of metals is an issue considered problematic in many fields, including in industrial production among others. Many anticorrosion materials are expensive and are noxious to the environment. This is an important issue that anticorrosion workers cannot ignore. This study proposes the use of biochar epoxy to boost the barrier properties of the coating, which is both economical and eco‐friendly. The incorporation of biochar can reduce the porosity of the coating and complicate the path of the corrosive media towards the steel substrate. Additionally, it can also reinforce the anticorrosion performance of the coatings. First, this article introduces the effect of biochars with different ultrasonic durations on the anticorrosion performance of anticorrosion coatings. After finding the biochar with the optimal ultrasonic duration, the effects of biochar on the anticorrosion performance of the coatings at different temperatures are assessed and the changes in its anticorrosion performance following soaking are discussed. The discussion concludes that applying biochar to anticorrosion coatings provides a feasible type of coating for anticorrosion work.