ギ酸水溶液中のAlの孔食発生に及ぼすリン酸の影響

須田 伸吾; 世利 修美

doi:10.3323/jcorr.64.228

Zairyo-to-Kankyo

Online ISSN : 1881-9664
Print ISSN : 0917-0480
ISSN-L : 0917-0480

-A Rapid Communication Note of the 61th Japan Conference on Materials Environments-

Effect of Phosphoric Acid on Pitting Attack of Aluminum in Formic Acid Solution

Shingo Suda, Osami Seri

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Keywords: pitting attack, aluminum, formic acid solution, phosphoric ions

JOURNAL FREE ACCESS

2015 Volume 64 Issue 6 Pages 228-230

DOI https://doi.org/10.3323/jcorr.64.228

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Abstract

An effect of phosphoric acid on pitting attacks of aluminum A1050 in a formic acid solution has been investigated. Surface observation after corrosion test revealed that the pitting attacks with 10~20 μm diameter occurred when H₃PO₄ concentration was higher than 100 ppm and temperature was 333 K or more. The anodic and cathodic reactions for the corrosion reaction were thermodynamically determined from E-pH diagrams.

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