Abstract
The influence of the photovoltaic effect on metal corrosion is investigated in this paper by preparing TiO2, γ-Fe2O3, and NiO nanoparticles connected with metals. The photo-induced protection and corrosion performance is analyzed by the photoelectrochemical performance and corrosion morphology. The n-type semiconductor TiO2 and p-type semiconductor NiO provide protection for coupled 304 stainless steel and Q235 carbon steel. While γ-Fe2O3 induces corrosion acceleration of Q235 carbon steel and corrosion retardation of 304 stainless steel, respectively. Photo-induced protection and corrosion is determined by the flat band potential of the semiconductor and the corrosion potential of the coupled metal, which induces inner electric field that driving charge transfer. Additionally, the redox potential of electrolyte influences the photo-induced corrosion performance. This paper provides a comprehensive understanding of the photo-induced corrosion and protection.
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