Study of the Effect of Acetic Acid and Phosphate on Copper Corrosion by Immersion Tests
- 1 Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Gifu, Japan
- 2 Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Gifu, Japan
- 3 Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Gifu, Japan
- 4 Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Gifu, Japan
- 5 Dai-Dan Co., Ltd., Saitama, Japan
- 6 Daiwa Techno Co., Ltd., Gifu, Japan
- 7 Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Gifu, Japan
Abstract
It was reported that hemispheric corrosion occurred in copper tubes in an acetic acid environment. When hemispheric corrosion occurred, corrosion could easily progress if water then flowed into the copper pipe, and countermeasures were needed. Therefore, we studied the copper corrosion caused by acetic acid. The present work investigated the relationship between the corrosion form of copper and acetic acid concentration using phosphorous-deoxidized copper, and reported that hemispherical corrosion was observed at acetic acid concentrations of 0.01 to 1 vol.% (0.002 to 0.2 mol · L -1 ) in the immersion test. In this study, the effects of acetic acid and phosphate on copper corrosion were examined using oxygen-free copper in immersion tests. The results suggested that different concentrations of phosphate in acetic acid solutions and the presence or absence of acetic acid and phosphate affected the corrosion of copper, resulting in different corrosion forms and corrosion progress.
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