Structure of Corrosion Product Formed on Carbon Steel Covered with NiSO4-added Resin Coating under Sulfuric Acid Mist Environment Containing Chloride

塩化物を含む硫酸ミスト環境において，NiSO4含有樹脂を被覆した炭素鋼の耐食性を評価した．形成した腐食生成物の構造を解明するため，放射光を用いたXRDおよびXAFS解析を実施した．NiSO4により，ゲーサイトおよびアカガネアイトの形成が促進された．このアカガネアイトは正方晶系のβ-FeOOHではなく，Niを含有した単斜晶系のアカガネアイトであると考えられる．
Corrosion resistance of carbon steel covered with resin coating containing nickel sulfate has been evaluated under chloride and sulfuric acid mist environment. The structure of corrosion products formed on steel surface was investigated by XRD and XAFS analyses using synchrotron radiation. Nickel sulfate promoted the formation of goethite and akaganeite. It was considered that this akaganeite was not tetragonal β-FeOOH but monoclinic akaganeite containing nickel.