著者

鳥越 泰 市野 隆英 中野 昌信

出版者

社団法人 腐食防食協会

雑誌

防食技術 (ISSN:00109355)

巻号頁・発行日

vol.28, no.6, pp.343-347, 1979

被引用文献数

2

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In view of increasing trend of applying water cooling to electric machines, investigation has been made on corrosion of the copper pipe that is comprised in the internally water cooled power cable. Practical tests on corrosion of the copper pipe by flowing pure water were carried out using actual power cable under practical use conditions with regard to conductivity, temperature, and oxygen content of water, and flow velocity. The ranges of flow velocity were chosen to be much wider than could be encountered in the actual cooling system. Corrosion quantity of the copper pipe was determined from analyzed data on ion exchange resin and filter. The result of two times corrosion tests made about one year, in state where water temperature are below 80°C and flow velocity are below 3m/s, are as fellows. (1) Corrosion rate of the copper pipe reached 2μ/year, but the traces of pitting corrosion was not detected. (2) By electrolytic reduction, predominant component of black corrosion products on the copper pipe surface was identified with CuO. (3) Corrosion products were found to have considerable effect on stifling corrosion rate.