Impact of inhibitor loaded with pigments content on properties of inorganic zinc rich coatings

In order to overcome the poor dispersion of traditional inorganic zinc -rich coating, addressing the sedimentation and the agglomeration caused by high zinc powder content and improve the anticorrosion performance of coatings. In this paper, the molybdate intercalated hydrotalcite flake zinc layer double hydroxide (ZnAl-NO3-/LDH) was synthesized by hydrothermal synthesis method at first, and the KH560 modified the Mo/LDH flake zinc powder was further obtained by ion exchange method. The results show that the samples have a layered structure of hydrotalcite with good crystal structure through X-ray diffraction (XRD) and Fourier transform infrared (FTIR), and the molybdate corrosion inhibiting ions inserted successfully into the interlayer structure of hydrotalcite. Meanwhile, different contents of pigments and fillers were added into the inorganic zinc -rich coatings. It was found that the Nyquist radius of curvature and modulus value of the coating were the largest with a pigment and filler content of 40 %, the maximum corrosion potential was -0.017V, and the minimum corrosion current density was 3.377 x 10-7 A -cm- 2. The result indicates that the coating has the best corrosion resistance with 40 % pigment content, which has good application prospects in the fields of cross -sea bridges, natural gas and oil pipelines et al.