Comparative study on corrosion behavior of Cu and Sn under UV light illumination in chloride-containing borate buffer solution

•Corrosion behavior of tin under UV illumination was investigated for the first time.•Photo-inhibition of corrosion was observed on tin, while photo-enhanced pitting corrosion was found on copper.•The structure and stability of the oxide film appeared to be crucial in the corrosion of metals under i...

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Bibliographic Details
Published in:Corrosion science 2021-07, Vol.186, p.109471, Article 109471
Main Authors: Wu, Jinxian, Wu, Yuqing, Wang, Julin
Format: Article
Language:English
Subjects:
Buffer solutions
Chlorides
Comparative studies
Copper
Corrosion
Corrosion effects
Corrosion tests
Illumination
Light
Metal oxides
Oxide coatings
Oxide film
Photo-induced corrosion
Pitting (corrosion)
Semiconductor
Tin
Ultraviolet radiation
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Summary:•Corrosion behavior of tin under UV illumination was investigated for the first time.•Photo-inhibition of corrosion was observed on tin, while photo-enhanced pitting corrosion was found on copper.•The structure and stability of the oxide film appeared to be crucial in the corrosion of metals under irradiation.•Photostability of the oxide film was found to decrease in the presence of chloride anions. Corrosion behaviors of copper and tin in chloride-containing borate buffer solutions (pH 8.4) were investigated through electrochemical and spectroscopic techniques in the presence and absence of UV illumination. Concerning effects of UV light on the corrosion processes, in a borate buffer solution containing 0.025 M NaCl, photo-enhanced pitting corrosion was observed on copper while photo-induced passivation was found on tin. The effect of UV illumination on corrosion was dependent on the interaction between the photo-generated carriers and the metal oxides, as well as the photostability of the oxide film. Chloride anions can decrease the photostability of the oxide film.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2021.109471