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Photoelectrochemical cathodic protection of amorphous zinc oxide coating on hot rolled steel SS400 in a 3 wt% NaCl solution and a Na2S-NaOH solution |
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| รหัสดีโอไอ | |
| Creator | Phatchara WIPATAPHAN |
| Title | Photoelectrochemical cathodic protection of amorphous zinc oxide coating on hot rolled steel SS400 in a 3 wt% NaCl solution and a Na2S-NaOH solution |
| Contributor | Worapot SRIPIANEM, Naw BLESSING OO, Thanate NA WICHEAN, Boossayamas DACHBUMROONG, Oratai JONGPRATEEP, Gasidit PANOMSUWAN, Naray PEWNIM, Ratchatee TECHAPIESANCHAROENKIJ |
| Publisher | Metallurgy and Materials Science Research Institute Chulalongkorn University |
| Publication Year | 2564 |
| Journal Title | Journal of Metals, Materials and Minerals |
| Journal Vol. | 31 |
| Journal No. | 4 |
| Page no. | 129-142 |
| Keyword | Photocathodic protection, Corrosion, Hole scavenger, Thin film, Zinc oxide |
| ISSN | 0857-6149 |
| Abstract | The photoelectrochemical cathodic protection of amorphous ZnO thin-film coating on hot rolled steel SS400, in the 3 wt% NaCl environment, was investigated. The ZnO thin film was coated on a SS400 substrate at 200? using the spray pyrolysis technique. The x-ray diffractometry analysis confirmed the amorphous ZnO coatings. Two different types of the electrochemical cells were used: a single-cell and a double-cell system. Two different types of the photoelectrolytic solutions were compared: (i) 0.1 M Na2S + 0.2 M NaOH and (ii) 3 wt% NaCl solution. The ZnO-coated SS400 samples were subjected to potentiostatic polarization testing under dark and UV conditions, with the immersion of either Na2S-NaOH or NaCl solution. The photoelectrochemical analysis showed that the photocathodic protection on SS400 by the ZnO coating could be demonstrated with the photoelectrolytic solution of Na2S-NaOH. The voltage was negatively shifted and the current density was increased with the UV irradiation on the ZnO coating, immersing in the Na2S-present solution. The ZnO coating was also stable in the Na2S-NaOH solution. The microstructural analyses with Optical Microscope and Scanning Electron Microscope were conducted to support the photoelecrochemical analyses. |
