Dissolution of Ti wires in sulphuric acid and hydrochloric acid solutions

Ti wire electrodes were immersed in acidic solutions containing H 2SO 4 and HCl of various concentrations at 353 K to evaluate corrosion rate by measurement of electric resistance change (resistometry). Addition of hydrochloric acid to sulphuric acid solution promoted depassivation of Ti. After depa...

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Veröffentlicht in:Corrosion science 2007-02, Vol.49 (2), p.469-480
Hauptverfasser: Azumi, Kazuhisa, Nakajima, Miho, Okamoto, Kosuke, Seo, Masahiro
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container_title Corrosion science
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creator Azumi, Kazuhisa
Nakajima, Miho
Okamoto, Kosuke
Seo, Masahiro
description Ti wire electrodes were immersed in acidic solutions containing H 2SO 4 and HCl of various concentrations at 353 K to evaluate corrosion rate by measurement of electric resistance change (resistometry). Addition of hydrochloric acid to sulphuric acid solution promoted depassivation of Ti. After depassivation, the immersion potential dropped to the hydrogen evolution potential and a hydride layer was formed on the surface. The hydride layer dissolved continuously in the acidic solution. SEM observation showed that Ti wires dissolved almost uniformly in the early stage and that the dissolution then trace became irregular due to nonuniform growth of the hydride layer. Dissolution rate of a Ti wire was estimated almost accurately by resistometry.
doi_str_mv 10.1016/j.corsci.2006.04.017
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subjects A. Titanium
Applied sciences
B. SEM
C. Hydrogen absorption
C. Passivity
Corrosion
Corrosion environments
Exact sciences and technology
Metals. Metallurgy
title Dissolution of Ti wires in sulphuric acid and hydrochloric acid solutions
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