In situ growth of corrosion resistant Mg-Fe layered double hydroxide film on Q235 steel

The use of LDH as powder additive has been proven to be an effective strategy to prevent metal corrosion. Mg-Fe LDH protective films grown on the steel surface has not only the directly physicalprotecting, but also ion substitution and chemical adsorption. In this study, we used a hydrothermal method to successfully in-situ grow Mg-Fe LDH film on steel substrates based on self-supplied Fe3+ ions. After systematic adjustment and parameter optimization, it was found that Mg-Fe LDH film exhibited the best growth morphology and comprehensive performance with an initial pH value of 10, Mg2+/ urea ratio of 1:4 and reaction time of 12h. The SEM and electrochemical results further demonstrated that Mg-Fe LDH film played a good protection effect on carbon steel surface.