Al流電陽極を用いた電気防食法がチタンクラッド鋼の水素吸収に及ぼす影響について

概要

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As a measure against corrosion of a large sized marine steel structure, a method of covering titanium-clad steel on the part of splash and tidal zones is often applied. In this case, titanium-clad steel is placed under the combined use state with cathodic protection, which uses aluminum anodes under sea water. Under this situation, it is known that the titanium part absorbs hydrogen which generates on the surface of titanium due to the nature of cathodic protection. On the other hand, when the amount of hydrogen absorption exceeds about 300 ppm, it is know that hydrogen embrittlement may occur due to titanium hydride formation. In order to elucidate how to treat this matter, we carried out exposure tests of cathodically protect titanium-clad steel to simulate existing structure of this kind. In this paper, we introduce the examination results. Also, we tried the long-term forecast of the amount of hydrogen absorbed in titanium through, the present experimental result. We demonstrated the predicted amount of hydrogen absorbed in titanium using the finite difference method for 100 years.
2008-06-25