Preparation and corrosion behavior studies of chemically bonded phosphate ceramic coating reinforced with modified multi‐walled carbon nanotubes ( MWCNT s)

Abstract To improve the corrosion resistance of the chemically bonded phosphate ceramic coating, the MWCNT s are selected as the reinforcement after the modification. Through the analysis of TEM , Raman, XRD , and FTIR , it can be shown that MWCNT s are modified with carboxyl groups and the surfactant after treatment, and show good dispersion. In addition, the electrochemical experiments were carried out with 3.5 wt% NaCl solution to investigate the corrosion behavior of the coatings. The results suggest that the corrosion resistance of coatings is improved with the introduction of MWCNT s and the corrosion resistance increases with the increase in MWCNT s. Besides, the corrosion mechanism of MWCNT s reinforced coating corrosion resistance was also investigated based on the corrosion behavior and microstructural characterizations. The gel strength is improved with the addition of MWCNT s because of its strong strength, which can prevent crack occurring and form the bridge when crack happens. Therefore, H ₂ O, O _2, and Cl ⁻ can be prevented from reaching to the substrate, which leads to good corrosion resistance.