The integrated anti-corrosion and anti-biofouling coating with high mechanical strength: Design, preparation and performance study

Long-term marine engineering equipment and infrastructure service will inevitably encounter corrosion and biofouling issues. However, the design and development of the integrated anti-corrosion and anti-biofouling coatings still face challenges. In this work, two types of coatings are designed based on the principles of liquid perfusion on a porous layered double hydroxides (LDH) film. The paraffin coating on LDH film has a good self-cleaning property against sea water, dyed deionized water, and coffee. Due to the resin perfusion, the adhesion force of epoxy resin coating increases by 50.9 % compared to bare steel. NiCo 2 S 4 -CNTs and NiCo 2 S 4 -CNTs-SPT nanomaterials with good anti-bacterial performance are prepared to significantly increase the coatings' mechanical strength, anti-corrosion, and anti-biofouling properties. NiCo 2 S 4 -CNTs-SPT/EP coating possesses the best performance. The stress strength of NiCo 2 S 4 -CNTs-SPT/EP coating is improved by 88.6 %, and the anti-biofouling efficiencies of NiCo 2 S 4 -CNTs-SPT/EP coating focusing on P. aeruginosa and C. vulgaris have high values of 98.66 % and 95.56 %, respectively. NiCo 2 S 4 -CNTs-SPT/EP coating has high impedance values of more than 10 9  Ω cm 2 after 70th day of testing, and the impedance changes little with time. The long-term anti-corrosion ability of NiCo 2 S 4 -CNTs-SPT/EP coating is confirmed by 600 h salt spray tests and 200 d field exposure tests.