論文
Fe(II)水溶液からの人工α-およびβ-FeOOHさび粒子の生成におよぼすタンニン酸の影響
2018 年 55 巻 5 号 p. 269-274
詳細
2018 年 55 巻 5 号 p. 269-274
In order to simulate the atmospheric corrosion of tannic acid-coated steels in industrial and coastal districts, artificial steel rust particles of α- and β-FeOOH were synthesized by aerial oxidation of aqueous Fe2+ solutions containing various amounts of tannic acid. Increasing addition amount of tannic acid accelerates the formation of amorphous iron-gallic acid complexes to suppress the generation of FeOOH rust. The crystallization and growth of α-FeOOH particles were inhibited by adding tannic acid, while those of β-FeOOH particles are markedly dependent of addition amount of tannic acid. Accordingly, it can be regarded that the tannic acid eluted from tannic acid-coated steels by atmospheric corrosion strongly affects on the formation of α- and β-FeOOH rust and the effect in coastal area is greater than urban district.
