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材料と環境 Vol. 69 (2020), No. 5

ISIJ International
belloff
オンライン版ISSN: 1881-9664
冊子版ISSN: 0917-0480
発行機関: Japan Society of Corrosion Engineering

Backnumber

  1. Vol. 73 (2024)

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  2. Vol. 72 (2023)

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  6. Vol. 68 (2019)

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  29. Vol. 45 (1996)

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  30. Vol. 44 (1995)

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  33. Vol. 41 (1992)

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21 Nov. (Last 30 Days)

材料と環境 Vol. 69 (2020), No. 5

錯体を作る沈殿インヒビターが陽イオンの配位子場に及ぼす影響とHSAB則

荒牧 國次

pp. 137-139

DOI:

10.3323/jcorr.69.137

抄録

Effect of ligand field on cation forming complexes with precipitation inhibitors for metallic corrosion in aerated neutral solution are discussed based on the hard and soft acids and bases （HSAB） principle. The energy levels of three 3d orbitals, dxy, dxz and dyz in Fe3＋, for example, decrease and two orbitals, dx2－y2 and dz2 increase markedly by approaching an effective ligand, ：CN－, resulting in the formation of d2sp3 hybrid orbital. Contrary, less effective ligand like ：NH3 provides sp3d2 hybrid orbital. Because chelating agents enhance the ligand field effect markedly, the d2sp3 hybrid orbital of Fe3＋ can be provided for the formation of chelate compound, resulting in stable coordinate bonds between hard acid and hard base.

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錯体を作る沈殿インヒビターが陽イオンの配位子場に及ぼす影響とHSAB則

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Ris

大気環境における球状黒鉛鋳鉄の初期腐食挙動

土手 一朗, 桑原 裕樹, 甲斐 信博, 貝沼 重信

pp. 140-147

DOI:

10.3323/jcorr.69.140

抄録

This study focused on the differences in initial corrosion behavior of spheroidal graphite cast iron, carbon steel and weathering steel in atmospheric corrosive environment, the atmospheric exposure test and dry/wet cyclic test were conducted to examine the effect of graphite and Cu of spheroidal graphite cast iron on its initial corrosion behavior. After exposure to the atmosphere for two years, the mean corrosion depth of spheroidal graphite cast iron is smaller than that of carbon steel and similar to that of weathering steel, whereas the initial corrosion of spheroidal graphite cast iron progresses earlier than carbon steel and weathering steel, regardless of the temperature, humidity, and the amount of sea salt. From the initial corrosion test results in the wet-dry cyclic test, that Cu precipitation was observed at the corrosion origin of the spheroidal graphite cast iron, which is same as that in weathering steel. Based on the findings obtained in this study, a schematic diagram of the initial corrosion mechanism of spheroidal graphite cast iron was speculated.

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大気環境における球状黒鉛鋳鉄の初期腐食挙動

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Ris

塩化物を含む硫酸ミスト環境においてNiSO4含有樹脂被覆炭素鋼に形成した腐食生成物の構造

林田 将汰, 高橋 正充, 出口 博史, 土谷 博昭, 花木 宏修, 山下 正人, 藤本 慎司

pp. 148-153

DOI:

10.3323/jcorr.69.148

抄録

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.

mendeley

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塩化物を含む硫酸ミスト環境においてNiSO4含有樹脂被覆炭素鋼に形成した腐食生成物の構造

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