Hybrid interface effect of g-C3N4/ZnO nanocomposites on the photoelectrochemical cathodic protection of 304 stainless steel in chloride solution

Htet Yadanar  SOE; Thanate  NA WICHEAN; Jularpar  SUNTTIPRAPAR; Parichart  CHAUM; Gasidit  PANOMSUWAN; Oratai  JONGPRATEEP; Ratchatee  TECHAPIESANCHAROENKIJ

doi:10.55713/jmmm.v36i3.2642

ผู้แต่ง

Htet Yadanar SOE Special Research Unit for Biomass Conversion Technology for Energy and Environment, Department of Materials Engineering, Faculty of Engineering, Kasetsart University, 50 Ngam Wong Wan Rd, Latyao, Chatuchak, 10900, Bangkok
Thanate NA WICHEAN Materials Innovation Center, Faculty of Engineering, Kasetsart University, 50 Ngam Wong Wan Rd, Latyao, Chatuchak, 10900, Bangkok
Jularpar SUNTTIPRAPAR Materials Innovation Center, Faculty of Engineering, Kasetsart University, 50 Ngam Wong Wan Rd, Latyao, Chatuchak, 10900, Bangkok
Parichart CHAUM Materials Innovation Center, Faculty of Engineering, Kasetsart University, 50 Ngam Wong Wan Rd, Latyao, Chatuchak, 10900, Bangkok
Gasidit PANOMSUWAN Special Research Unit for Biomass Conversion Technology for Energy and Environment, Department of Materials Engineering, Faculty of Engineering, Kasetsart University, 50 Ngam Wong Wan Rd, Latyao, Chatuchak, 10900, Bangkok
Oratai JONGPRATEEP Special Research Unit for Biomass Conversion Technology for Energy and Environment, Department of Materials Engineering, Faculty of Engineering, Kasetsart University, 50 Ngam Wong Wan Rd, Latyao, Chatuchak, 10900, Bangkok
Ratchatee TECHAPIESANCHAROENKIJ Special Research Unit for Biomass Conversion Technology for Energy and Environment, Department of Materials Engineering, Faculty of Engineering, Kasetsart University, 50 Ngam Wong Wan Rd, Latyao, Chatuchak, 10900, Bangkok

DOI:

https://doi.org/10.55713/jmmm.v36i3.2642

คำสำคัญ:

Metal corrosion, Photoelectrochemical cathodic protection, g-C3N4, ZnO, Composite materials

บทคัดย่อ

The development of efficient and environmentally friendly corrosion protection systems for metals in aggressive environments has become a critical area of research, particularly for stainless steel used in marine and industrial applications. In this study, a series of graphitic carbon nitride (g-C₃N₄) and zinc oxide (ZnO) composites with varying g-C₃N₄ weight ratios (10 wt% and 30 wt%), are integrated to form heterojunction structures with enhanced charge separation and interfacial activity. The g-C₃N₄/ ZnO (ZCN) composite thin films were prepared using a facile thermal mixing method and were characterized using XRD, SEM, BET, FTIR, UV-Vis, and PL to confirm their structural, morphological, and optical properties. Electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization measurements of the ZCN thin films and 304 stainless steel samples under 3.5 wt% NaCl solution showed higher photocurrent density, more negative photopotential displacement, and lower charge-transfer resistance, confirming accelerated electron migration from the ZCN thin film to the stainless-steel substrate. The open circuit potential (OCP) of the steel shifted negatively under illumination, confirming the generation of photogenerated cathodic protection. These results highlight the critical role of the hybrid interface and optimized g-C₃N₄content in improving light-driven corrosion protection systems. The 10 wt% g-C₃N₄/ZnO nanocomposite offers a promising approach for the development of efficient photo-electrochemical coatings aimed at protecting stainless steel in harsh electrolyte environments.

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