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Zairyo-to-Kankyo Vol. 72 (2023), No. 4

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

Backnumber

  1. Vol. 73 (2024)

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  6. Vol. 68 (2019)

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  29. Vol. 45 (1996)

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  33. Vol. 41 (1992)

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  34. Vol. 40 (1991)

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Zairyo-to-Kankyo Vol. 72 (2023), No. 4

Corrosion Behavior of Silver with a Special Reference to Electronics Application

Yuichi Ishikawa

pp. 105-114

DOI:

10.3323/jcorr.72.105

Abstract

Metallic materials used in electronic components and devices corrode in the same ways as automobiles and bridges, but their small dimensions make them orders of magnitude more susceptible to corrosion failure. The corrosion involves interactions with environment. These interactions can be put to use under control. This article presents the tarnishing film formation characteristics of silver as the first part of a series of articles describing corrosion behavior of silver in electronics application. The mechanisms and processes of tarnishing are discussed and indoor tarnishing film formation rates are presented.

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Corrosion Behavior of Silver with a Special Reference to Electronics Application

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Corrosion Characteristics of Steel Bars in Concrete Located in Tidal Zone

Masayuki Hara, Nagate Hashimoto, Toru Yamaji, Hiroyuki Kobayashi, Yukihiro Sone, Hidenori Hamada

pp. 115-120

DOI:

10.3323/jcorr.72.115

Abstract

A test specimen simulating a pier, which is a harbor structure with a series of reinforced concrete members from the atmospheric to the tidal zone, was fabricated and tested for exposure to seawater. The potential and current density of the reinforcing bars in each environmental category were observed to investigate the effect of tidal fluctuations on the corrosion of the reinforcing bars in the concrete. As a result, changes in the rebar potential and current density were observed in synchronization with tidal fluctuations. The formation of different macrocells was observed depending on the tidal level, and the macrocell characteristics changed with the lengthening of the exposure period.

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Corrosion Characteristics of Steel Bars in Concrete Located in Tidal Zone

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Non-destructive Measurement of Fiber Embedding Depth in Degradation Detection Sensor of FRP Hydrochloric Acid Storage Tank

Yuto Tanimura, Masatoshi Kubouchi, Winarto Kurniawan

pp. 121-125

DOI:

10.3323/jcorr.72.121

Abstract

A non-destructive method for measuring the fiber embedment depth of an optical fiber sensor used to detect degradation of an FRP hydrochloric acid storage tank was investigated. Ultrasonic and optical coherence tomography （OCT） measurements were performed on sensors with various fiber depths, and their accuracies were compared. As a result, it was determined that the OCT measurement was more accurate and relatively effective. The validity of the hydrochloric acid penetration rate calculated from the fiber depth measured by OCT and the discoloration start time of the sensor module when immersed on one side was also examined.

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Non-destructive Measurement of Fiber Embedding Depth in Degradation Detection Sensor of FRP Hydrochloric Acid Storage Tank

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Effects of the Low-oxygen Gas-phase Radiolysis on the Corrosive Environment in the Liquid Phase

Kuniki Hata, Atsushi Kimura, Mitsumasa Taguchi, Tomonori Sato, Chiaki Kato, Yutaka Watanabe

pp. 126-130

DOI:

10.3323/jcorr.72.126

Abstract

Gamma-radiolysis experiments with gas-liquid coexistent samples were carried out to investigate effects of gas-phase radiolysis on corrosive environment for materials in solutions under irradiation. After gamma-ray irradiation, hydrogen peroxide, nitrate ion, nitrite ion were detected in the liquid phase. The production yields of nitrate ion and nitrite ion increased with increasing gas-phase volume and oxygen concentration. This result indicated that chemical reactions including oxygen and nitrogen in the gas phase were required for the production of nitrate ion and nitrite ion. To magnify the effects of gas-phase radiolysis in the gas-liquid coexistent samples, absorption dose rate in the liquid phase was reduced by one-hundredth using lead shield. The concentration of hydrogen peroxide and the pH in the shielded liquid phase were similar to those in the irradiated pure water, which did not contact with gas phase. This result indicated that the effects of nitrate ion and nitrite ion dissolved in the liquid phase on water radiolysis were not important in the current experimental system, in which the effects of gas-phase radiolysis were increased by 100-times.

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Effects of the Low-oxygen Gas-phase Radiolysis on the Corrosive Environment in the Liquid Phase

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Predictive Model of Thermodynamic Properties and CO2 Corrosion of Carbon Steels in CCS Environments

Masakatsu Ueda, Toshiyuki Sunaba

pp. 131-141

DOI:

10.3323/jcorr.72.131

Abstract

A thermodynamic model （U-Cal model） has been developed that predicts fugacities and water content in the CO2 phase （gas or supercritical fluid）, and CO2 solubility and pH in aqueous solution in CCS environment, which is a CO2 environment in a supercritical state. The values predicted by the U-Cal model agreed well with the measured values. The water content in the CO2 phase increases to 1-10 g/L due to the mutual dissolution of CO2 and H2O. The increase in the solubility of CO2 in aqueous solution and the decrease in pH with increasing pressure are small. The CO2 corrosion behavior of carbon steel was discussed by using the U-Cal model. In iron dissolution dominant CO2 corrosion in aqueous solution of carbon steel, the corrosion rate could be understood as a function of pH. In FeCO3 formation dominant CO2 corrosion, it was considered that the corrosion progressed as FeCO3 dissolves to supersaturation and then FeCO3 precipitated on the surface of the material. The FeCO3 precipitation behavior was predicted from the crystal growth rate equation. Corrosion of carbon steel in the CO2 phase involves similar mechanisms to corrosion in aqueous solution, but the corrosion rate is lower.

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Predictive Model of Thermodynamic Properties and CO2 Corrosion of Carbon Steels in CCS Environments

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