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材料と環境 Vol. 69 (2020), No. 7

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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  27. Vol. 47 (1998)

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  29. Vol. 45 (1996)

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  30. Vol. 44 (1995)

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キーワードランキング

21 Nov. (Last 30 Days)

材料と環境 Vol. 69 (2020), No. 7

HSAB則に基づいて考えた大気開放中性水溶液中における沈殿インヒビターの腐食抑制機構

荒牧 國次

pp. 186-193

DOI:

10.3323/jcorr.69.186

抄録

It has been confirmed that corrosion inhibition mechanisms of various inhibitors are closely related to the hard and soft acids and bases principle （HSAB principle）. The inhibition mechanisms of cationic and anionic precipitation inhibitors in aerated neutral solutions are discussed based on the HSAB principle in this review. Cooperative inhibition of cationic and anionic inhibitors is also described. The effect of ligand field on the corrosion inhibition is discussed on the basis of the principle.

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HSAB則に基づいて考えた大気開放中性水溶液中における沈殿インヒビターの腐食抑制機構

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Ris

High-Temperature Annealing of Ferritic Stainless Steel: Modification of Sulfide Inclusion Properties and Inhibition of Inclusion Dissolution

Masashi Nishimoto, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

pp. 194-198

DOI:

10.3323/jcorr.69.194

抄録

The effects of the annealing temperature on the electrochemical properties, anodic dissolution, and pitting corrosion resistance of MnS inclusions in 18mass％Cr ferritic stainless steel are investigated by scanning electron microscopy, macroscale polarization, and microscale polarization. The MnS inclusions in the specimens annealed at higher temperatures have higher Cr concentrations and lower Mn concentrations. The onset potential of the inclusion dissolution and the pitting corrosion resistance of the MnS inclusions increase with an increasing annealing temperature.

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オクチルチオプロピオン酸ナトリウムと種々の金属イオンの鉄腐食に対する相乗抑制効果

志村 正, 荒牧 國次

pp. 199-203

DOI:

10.3323/jcorr.69.199

抄録

Synergistic inhibition effects of sodium octylthiopropion-ate NaC8H17S（CH2）2CO2（NaOTP） and various metallic cations were investigated on iron corrosion in aerated 0.5 M Na2SO4 by polarization measurement and X-ray photoelectron spectroscopy （XPS）. Lower inhibition efficiencies than the efficiency of 3×10－4 M NaOTP alone were obtained by the addition of 1×10－4 M cations, Al3＋, Ga3＋, Y3＋, La3＋ and Ce3＋ to the solution where precipitates formed. Although clear solutions appeared by reducing the concentration of the cations, no synergistic inhibition effect of NaOTP and the cations on iron corrosion was observed. Addition of 1×10－4 M Zn2＋ to the 3× 10－4 NaOTP solution, in which no precipitate formed, resulted in synergistic inhibition. XPS showed on the iron surface covered with a chelate precipitate composed of OTP－ and Zn2＋.

mendeley

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オクチルチオプロピオン酸ナトリウムと種々の金属イオンの鉄腐食に対する相乗抑制効果

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21 Nov. (Last 30 Days)

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