Abstract
To obtain nanocomposite coating resistant to CO2 corrosion, new idea is proposed in this paper. First, based on first-principle method, adsorption characteristics of CO2 on different nanocomposite coatings were studied, and coating structure with CO2 corrosion resistance was optimized. Then, relevant experiments were carried out to verify corrosion resistance of coating and evaluate CO2 corrosion resistance. Results indicate that coating structure resistant to CO2 corrosion is Ni-W alloy as matrix metal; Y2O3 and ZrO2 nanoparticles are added with mass ratio of 1:1. In this case, adsorption energy of CO2 reaches the minimum, and corrosion resistance is optimal. Theoretical result was confirmed by scanning electron microscopy observation and electrochemical test of coating. When the coating is placed in CO2 environment with different partial pressures and temperatures, after a period of time, it is still dense, and no corrosion pits appear on the surface. Electrochemical test results show that the resistance of coating after CO2 corrosion is high, and corrosion resistance is still good. Above simulation and experimental results provide new idea for the structural optimization of nanocomposite coatings.
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