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Abstract

The corrosion inhibition competency of titanium oxide/graphitic nitride composites coated with stainless steel substrate (TiO2/g-CN/SS) were investigated in 1.0 M of HCl solution. TiO2 nanoparticles of different loads were applied as supplementary ingredients to improve the corrosion resistance of native graphite carbon nitride (g-C3N4) (g-CN). All blended materials were characterized by different analytical tools to investigate their chemical structure, surface morphology, electrochemical property, stability, and corrosion protection capacity. The presence of TiO2 as an energetic modifier plays an important role in improving the g-CN protection proficiency and mitigating the rate of SS corrosion activity. All prepared composite samples displayed good surface protection with an exceptional corrosion resistance by 30% TiO2/g-CN load. The unique corrosion behavior of a 30% TiO2/g-CN loaded sample has a direct impact on tangible merging and compatible dispersion of TiO2 nanoparticles within g-CN material. The experimental data from Nyquist and Bode plots demonstrate the robustness of the 30% load with the highest charge transfer resistance value approaching 3.7 k$\Omega $. The corrosion rate generated by a 30% load approached 0.003 mpy, which is nearly 5 to 8 orders of magnitude lower than those produced by other loadings, demonstrating a robust and complete protection. In addition, it showed a maximum inhibition efficiency of 98.2% which was supported by surface images. The immersion time prior to the stability test of the novel protective composite showed a durable surface material for excellent resistance and steady-state coating observed by small change in icorr and Ecorr over a period of 7 days. The mechanistic protection process involved the characteristic action of TiO2 via blocking corrosion-prone sites on g-CN materials that successfully hindered the diffusion of acidic environment elements to the surface of the metallic substrate.

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