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Zairyo-to-Kankyo Vol. 68 (2019), No. 2

ISIJ International
belloff
ONLINE ISSN: 1881-9664
PRINT ISSN: 0917-0480
Publisher: Japan Society of Corrosion Engineering

Backnumber

  1. Vol. 73 (2024)

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  30. Vol. 44 (1995)

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Keyword Ranking

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Zairyo-to-Kankyo Vol. 68 (2019), No. 2

As One Corrosion Prevention Engineer

Kenkichi Tashiro

pp. 35-35

DOI:

10.3323/jcorr.68.35

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As One Corrosion Prevention Engineer

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Analysis of the Outputs and Corrosion Rates of ACM Sensors in Aqueous Solutions with Different Salt Concentrations

Takaya Ono, Tomoyasu Suzuki

pp. 42-45

DOI:

10.3323/jcorr.68.42

Abstract

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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Analysis of the Outputs and Corrosion Rates of ACM Sensors in Aqueous Solutions with Different Salt Concentrations

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Influence of Strain Rate on Fracture Characteristics and Diffusible Hydrogen of High Tensile Steel under Hydrogen Charging

Gaku Kitahara, Aya Tsuji, Takashi Asada, Tomohiro Suzuki, Keitaro Horikawa, Hidetoshi Kobayashi

pp. 46-52

DOI:

10.3323/jcorr.68.46

Abstract

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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Influence of Strain Rate on Fracture Characteristics and Diffusible Hydrogen of High Tensile Steel under Hydrogen Charging

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