防食技術
Online ISSN : 1884-1155
Print ISSN : 0010-9355
HCl中でのチタンの腐食に及ぼすNO-3の影響
渡辺 孝内藤 浩光
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1989 年 38 巻 9 号 p. 480-484

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A study was made of the effect of addition of NO3- ions on the corrosion of titanium in HCl solutions. For titanium, NO3- ions was necessary to add at least 0.008kmol·m-3 (0.05mass%) to achieve corrosion inhibition in HCl solutions. Above this concentration, titanium passivates, and hydrogen pick up by titanium was also prevented. Ti3+ ions near surface seem to be quickly oxidized by NO2 formed with other products in the reduction of NO3- to Ti4+ in the reaction Ti3++NO2→Ti4++NO2-. As a result, titanium passivates and corrosion inhibition of titanium is achieved.

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