Investigation of photocathodic corrosion protection of ZnO/ZnS thin film for AISI 304 stainless steel in 3.5 wt% NaCl solution

Authors

• Soravid Veerapong
• Naw Blessing Oo
• Boossayamas Dachbumroong
• Parichart Chaum
• Thanate Na Wichean
• Oratai Jongprateep
• Naray Pewnim
• Gasidit Panomsuwan
• Ratchatee Techapiesancharoenkij

Publication Date

2025

Abstract

Photocathodic protection is an alternative cathodic protection technique to protect metals by photo-generated electrons from a coupled semiconductor film under solar light. In this report, ZnO nanorods and heterostructure ZnO/ZnS nanorod films  on FTO substrates were studied for their photocathodic protection for 304 stainless steels (304 SS) in a 3.5 wt% NaCl solution.  The ZnO and ZnO/ZnS nanorods were fabricated on FTO substrates by spray pyrolysis and hydrothermal processes. The photocathodic performances of the ZnO and ZnO/ZnS photoanodes coupled with 304 SS samples were examined by Open-Circuit Potential (OCP), polarization curve analysis, and electrochemical impedance spectra (EIS). The ZnO/ZnS photoanodes showed better photocathodic performance than the ZnO photoanodes with larger negative potential shifts and higher photo-generated current density under light illumination. The ZnO/ZnS heterostructure films show promising photocathodic protection for 304 SS under chloride atmosphere. However, both ZnO and ZnO/ZnS failed to provide any protection under dark conditions.

DOI

10.55713/jmmm.v35i1.2105

First Page

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Last Page

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Recommended Citation

Veerapong, Soravid; Blessing Oo, Naw; Dachbumroong, Boossayamas; Chaum, Parichart; Na Wichean, Thanate; Jongprateep, Oratai; Pewnim, Naray; Panomsuwan, Gasidit; and Techapiesancharoenkij, Ratchatee (2025) "Investigation of photocathodic corrosion protection of ZnO/ZnS thin film for AISI 304 stainless steel in 3.5 wt% NaCl solution," Journal of Metals, Materials and Minerals: Vol. 35: No. 1, Article 5.
DOI: 10.55713/jmmm.v35i1.2105
Available at: https://digital.car.chula.ac.th/jmmm/vol35/iss1/5