Corrosion prevention of aluminum heat exchanger in deoxidized pure water

Katsuya Ishii, Ryota Ozaki, Kenji Kaneko, Masataka Masuda

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    1 Citation (Scopus)

    Abstract

    In the development of the adsorption refrigerator, one of the most serious concern is to protect the corrosion from aluminum heat exchanger in deoxidized water. Two kinds of corrosion protection methods were discussed. One was to form an SiO2 Sol/Gel film of which thickness is about 2 μm on the aluminum surface and the other was to add small amount of SiO3 2- in the deoxidized water. When an aluminum sheet of A1N99 coated with the SiO2 Sol/Gel film on the surface was immersed in deoxidized water, corrosion did not occur during 10000 h. In the case of actual aluminum heat exchanger with the same film on the surface, although corrosion did not happen during the first 1800 h, it came out suddenly after 1800 h. From the result of this corrosion performance, the aluminum heat exchanger with the SiO2 Sol/Gel film is not considered to be proper for the application to the refrigerator. The effect of SiO32- in water to protect the corrosion was investigated and it was confirmed that corrosion from the aluminum heat exchanger with the SiO2 Sol/Gel film did not occur for at least 5000 h in the deoxidized water with 5 ppm SiO3 2-.

    Original languageEnglish
    Pages (from-to)299-304
    Number of pages6
    JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
    Volume72
    Issue number4
    DOIs
    Publication statusPublished - Apr 2008

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Mechanics of Materials
    • Metals and Alloys
    • Materials Chemistry

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