@article{oai:rekihaku.repo.nii.ac.jp:00000558,
 author = {金子, 克美 and Kaneko, Katsumi},
 journal = {国立歴史民俗博物館研究報告, Bulletin of the National Museum of Japanese History},
 month = {Mar},
 note = {application/pdf, 古墳出土鉄器の腐食生成物には主としてα-FeOOHとγ-FeOOHとが含まれる。古墳出土鉄器の保存にはFeOOH微結晶の構造と表面化学性が重要な働きをするとみられる。鉄器の腐食に関連する，SO₂，H₂OおよびSO₄²⁻，Cl⁻とFeOOH結晶との相互作用，更にFeOOH結晶の不活性化について論ずる。, The corrosion products of iron swords from burial mounds contain α-FeOOH, γ-FeOOH, Fe₃O₄, and amorphous iron hydroxides. The determination and infrared spectroscopy after separation of ground samples into magnetic and nonmagnetic parts by a handy magnet and successive dissolution of specific components by several acids is introduced. The magnetic corrosion products contain mainly Fe₃O₄, while nonmagnetic samples are predominantly composed of α-FeOOH. The content of α-FeOOH in the corrosion products from the iron swords is much greater than that of atmospheric corrosion products.
The surface chemistry of FeOOH microcrystals should play an essentially important role in the conservation of the cultural properties from burial mounds. The crystal and surface structures and surface activities for H₂O and SO₂ of each FeOOH polymorph are explained. Surface hydroxyls on the predominant crystal faces of FeOOH are especially important, causing high adsorption activities for H₂O and SO₂.
The FeOOH microcrystals exhibit n-type semiconductivity. The electrical conductivity increases with the rise of temperature and is sensitive to impurities and to the surrounding atmosphere. The dc electrical conductivity at room temperature in dry air is 2-3×10⁻⁹ ohm⁻¹ cm⁻¹. The electrical conductivity increases markedly with adsorption of H₂O and SO₂. High electrical conductivity of the oxide layer due to adsoprtion of H₂O and SO₂ accelerates the corrosion reaction on the iron surface. Also FT-IR examinations show that chemisorption of SO₂ on FeOOH surfaces creates So₃²⁻ and SO₄²⁻, which should induce further corrosion. High surface activity of FeOOH crystals is a serious barrier for the preservation of the corroded cultural properties.
Simple surface modification of FeOOH crystals with titanates can change from hydrophilic to hydrophobic surfaces. The titanation leads to marked decrease in the electrical conductivity and in the amount of H₂O adsorption. The titanation of corroded cultural properties should prohibit further corrosion. The preservation method with the titanate coating for the iron-based corroded cultural properties is proposed.},
 pages = {273--285},
 title = {古代鉄試料錆の状態分析},
 volume = {38},
 year = {1992},
 yomi = {カネコ, カツミ}
}