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材料と環境 Vol. 68 (2019), No. 2

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)

    1. No.9
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    3. No.7
    4. No.6
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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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  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

21 Nov. (Last 30 Days)

材料と環境 Vol. 68 (2019), No. 2

防食技術者として

田代 賢吉

pp. 35-35

DOI:

10.3323/jcorr.68.35

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Bibtex

Ris

各種塩分濃度の水溶液中におけるACMセンサの出力と腐食速度の検討

小野 孝也, 鈴木 智康

pp. 42-45

DOI:

10.3323/jcorr.68.42

抄録

For analyzing corrosion rates in a wet environment, Fe/Ag galvanic couple atmospheric corrosion monitoring （ACM）-type corrosion sensors were immersed in aqueous solutions with different NaCl concentrations to measure their output currents and Fe-Ag potential differences. In addition, resistmetry corrosion monitoring （RCM） sensors were used to determine the actual corrosion depths for comparison with the data collected from ACM sensors. The comparison revealed correlations between actual corrosion depths and output of ACM sensors, and potential differences between Fe and Ag showed higher correlations when compared with output currents of ACM sensors. Accordingly, it is considered that corrosion rates can be accurately estimated from conventional output current values under rainless environment, and from Fe-Ag potential differences under wet environment. Moreover, this method is thought to help to extend the life of ACM sensors.

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各種塩分濃度の水溶液中におけるACMセンサの出力と腐食速度の検討

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Bibtex

Ris

水素チャージ下における高張力鋼板の破壊および拡散性水素に及ぼすひずみ速度の影響

北原 学, 辻 彩, 浅田 崇史, 鈴木 智博, 堀川 敬太郎, 小林 秀敏

pp. 46-52

DOI:

10.3323/jcorr.68.46

抄録

Hydrogen embrittlement susceptibility is known to vary with decreasing strain rate. In this study, influence of strain rate on ductility, fracture characteristics and diffusible hydrogen in high tensile steel sheet under hydrogen charging was investigated using the tensile test by changing strain rate, fractography and thermal desorption spectroscopy （TDS）. The ductility was lowered as strain rate decreased. Conversely, hydrogen embrittlement was not observed for the high strain rate with the magnitude in the order of 10－3/s. The specimen with lowered ductility presented quasi-cleavage fracture and intergranular fracture. In this specimen, the faster the strain rate was, the wider and shallower the brittle fracture was distributed surrounding the test piece. On the other hand, the brittle fracture spreading to the inside was locally observed as the strain rate became slower. TDS revealed that the variation of ductility with change in strain rate depends on the hydrogen trapping sites and the amount of hydrogen trapped in dislocations and grain boundaries.

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水素チャージ下における高張力鋼板の破壊および拡散性水素に及ぼすひずみ速度の影響

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