Enhancement of Photoelectrochemical Cathodic Protection of Copper in Marine Condition by Cu-Doped TiO2

Catalysts

Pailin Ngaotrakanwiwat¹  Piyapol Heawphet¹  Pramoch Rangsunvigit² 

[1] Department of Chemical Engineering, Burapha University, Chonburi 20131, Thailand;The Petroleum and Petrochemical College, Chulalongkorn University, Bangkok 10330, Thailand;

关键词: tio₂;    cu;    anti-corrosion;    photoelectrochemical cathodic protection;   

DOI  :  10.3390/catal10020146

来源: DOAJ

【 摘 要 】

Photochemical cathodic protection (PEC) efficiency was enhanced by doping TiO₂ with Cu (Cu/TiO₂) through impregnation and reduction under hydrogen. The Cu loading was vaired from 0.1 to 1.0 mol% (0.1 Cu/TiO₂, 0.5 Cu/TiO₂, 1 Cu/TiO₂). Then, up to 50 wt% Cu/TiO₂ was mixed with TiO₂ to form nanocomposite films. The film photocurrent and photopotential were measured under 1 mW/cm² UV irradiation. The Cu/TiO₂ film with 10 wt% of 0.5 Cu/TiO₂ exhibited the highest photocurrent of 29.0 mA/g, which was three times higher than the TiO₂ film. The underlying reason for the high photocurrent was the lower photopotential of film than the corrosion potential of copper for PEC. This film was also applied on copper terminal lug for anti-corrosion measurement by Tafel polarization in 3.5 wt% NaCl solution. The results showed that the photopotential of terminal lug coated with the film was −0.252 V vs. Ag/AgCl, which was lower than the corrosion potential of copper (−0.222 V vs. Ag/AgCl). Furthermore, the film can protect the corrosion of copper in the dark with 86.7% lower corrosion current (i_corr) than that of bare copper.

【 授权许可】

Unknown