Protection Performance of Plasma Sprayed Al2O3-13 wt%TiO2 Coating Sealed with an Organic-inorganic Hybrid Agent

An organic-inorganic hybrid sealing agent was fabricated and used in the plasma sprayed Al2O3-13 wt%TiO2 coating, and conventional silicone agent was also used for comparison. Protection performance of the coatings was comprehensively evaluated based on both anti-corrosion and anti-biofouling properties. The results reveal that the sealing treatment is remarkably useful to decrease the porosity of the coating, and the porosity of the coating sealed with the hybrid agent is only 0.035%. Immersion corrosion test and Tafel polarization test reveal that the sealed coating with the hybrid agent exhibits a better corrosion resistance by compared with the coating sealed with silicone agent. The corrosion current density i(corr) of the hybrid agent sealed coating is only 0.7 x 10(-6) A center dot cm(-2). Moreover, anti-biofouling tests both in the outdoor analogue hydraulic environment and in the natural marine environment prove that the mentioned novel coating presents a better combination of corrosion resistance and anti-biofouling property by compared with the other coatings, and it could be used as a protection of metal components in the marine environment.

Automated summary

An organic-inorganic hybrid sealing agent was developed and used for coating protection. The hybrid agent significantly reduces coating porosity and enhances corrosion resistance and anti-biofouling properties.