硝酸-ふつ化水素酸酸洗液中のふつ化鉄イオンの挙動

概要

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The conditions of formation of FeF^<2+>, FeF_2^+ and FeF_3 in the pickling solution of HNO_3 and HF for stain less steels have been studied. The types of ferricfluoride ions depend on the ratio of concentrations (g/l) of total fluoric ion to that of ion in the pickling solution. When this ratio exceeds 1.5, FeF_2^+ ion is formed and FeF^<2+> ion is formed when the ratio is less than 1.5. Precipitates in the pickling solution are FeF_3・3H_2O and scales formed during annealing of stainless steels. The amounts of precipitates FeF_3・3H_2O increases with the concentrations of total fluoric ions and ferric ion. When the concentration of ferric ion is less than 15 g/l, precipitate of FeF_3・3H_2O is not formed. For the determination of uncomplexed HF in the pickling solution, volumetric titration method with standard H_3BO_3 solution is employed.
社団法人日本鉄鋼協会の論文
1984-09-01