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材料と環境 Vol. 60 (2011), No. 6

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

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  1. Vol. 73 (2024)

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  2. Vol. 72 (2023)

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  3. Vol. 71 (2022)

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  4. Vol. 70 (2021)

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  5. Vol. 69 (2020)

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  6. Vol. 68 (2019)

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  7. Vol. 67 (2018)

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  8. Vol. 66 (2017)

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  9. Vol. 65 (2016)

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  10. Vol. 64 (2015)

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  11. Vol. 63 (2014)

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  12. Vol. 62 (2013)

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  14. Vol. 60 (2011)

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  17. Vol. 57 (2008)

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  18. Vol. 56 (2007)

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  19. Vol. 55 (2006)

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  24. Vol. 50 (2001)

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  25. Vol. 49 (2000)

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  26. Vol. 48 (1999)

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  27. Vol. 47 (1998)

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  28. Vol. 46 (1997)

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  29. Vol. 45 (1996)

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  30. Vol. 44 (1995)

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  31. Vol. 43 (1994)

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  32. Vol. 42 (1993)

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  33. Vol. 41 (1992)

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  34. Vol. 40 (1991)

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キーワードランキング

10 May. (Last 30 Days)

材料と環境 Vol. 60 (2011), No. 6

超音速粒子の衝突・堆積現象を利用した防食コーティング技術の開発

川喜多 仁

pp. 277-280

DOI:

10.3323/jcorr.60.277

抄録

A coating process is necessary to satisfy various requirements for corrosion protection. Based on clarification of the impact and deposition phenomenon of supersonic particle, the control mechanism of temperature and velocity of the in-flight particle was devised. The coating method (Warm Spray) was realized for active materials such as titanium, metallic glass, titanium oxide and plastic, which are highly corrosion-resistant while they are difficult to be deposited in the air.

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超音速粒子の衝突・堆積現象を利用した防食コーティング技術の開発

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Ris

醤油環境における各種ステンレス鋼の電気化学インピーダンス特性

藤井 英則, 高谷 泰之, 松尾 吉晃, 杉江 他曾宏

pp. 290-295

DOI:

10.3323/jcorr.60.290

抄録

The characterization of passivation on austenitic and duplex stainless steels in soy sauce at 333 K were investigated by using electrochemical impedance spectroscopy (EIS). The soy sauce solution contained 18.4 mass% sodium chloride, 3.00 mass% organic acid, 6.80 mass% protein and 2.50 mass% ethyl alcohol at pH 4.9. These impedance spectra of stainless steels could been simulated the equivalent circuit model with four parameters, oxide capacitance, oxide resistance, charge-transfer reaction resistance and double layer capacitance. The thickness of passive films (reciprocal capacitance of films) were proportional to the resistance of films and charge transfer resistance.

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醤油環境における各種ステンレス鋼の電気化学インピーダンス特性

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種々の材質表面への炭酸カルシウムスケールの付着現象

澤田 清, 管野 元太, 飯野 誠之, 佐藤 敬一

pp. 296-303

DOI:

10.3323/jcorr.60.296

抄録

The phenomena of scale formation of calcium carbonates on the solid plate surfaces (metals, glasses, plastics) in supersaturated solution was investigated at 25.0°C. Except for particular case, the most stable polymorph calcite was adhered and grown on the plate surface. The unstable polymorph vaterite was formed on some metal surfaces under the conditions that the metal plate was inserted in the solution just after the precipitation of CaCO3. The surface density of the number of calcite crystals on the plastic surfaces were very high compared with that on metal surfaces. Roughness of the plastic surface promotes the increase in the surface density of adhered crystals

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種々の材質表面への炭酸カルシウムスケールの付着現象

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空冷式熱交換器伝熱管におけるNH4HSの濃縮機構解明

鳥羽 和宏, 川野 浩二, 田中 耕太郎, 岩脇 大仁, 酒井 潤一

pp. 304-311

DOI:

10.3323/jcorr.60.304

抄録

Highly concentrated NH4HS causes significant corrosion. In high pressure plants such as hydrodesulfurization units operated under NH4HS environments, leakage caused by corrosion could result in catastrophic disaster. Therefore, in the design phase, corrosion prevention techniques should be considered. In this study, based on the severe NH4HS corrosion observed selectively in the vapor phase inside air cooled heat exchanger tubes, the NH4HS concentrating model was developed to discern the difference in NH4HS concentration between the vapor phase and the liquid phase. We elucidated that NH4HS concentration in the condensed area in the vapor phase can be much higher than the liquid phase due to the difference of the heat transfer coefficient. This result quantitatively demonstrated the cause of corrosion observed in the air cooled heat exchanger tubes. In addition, this study indicated that the design of the air cooled heat exchanger tube where NH4HS corrosion shall be concerned should consider a flow regime, air temperature or predicted NH4HS concentration in the condensed area in the vapor phase.

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空冷式熱交換器伝熱管におけるNH4HSの濃縮機構解明

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