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Zairyo-to-Kankyo Vol. 73 (2024), No. 6

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

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Zairyo-to-Kankyo Vol. 73 (2024), No. 6

Corrosion of Oil Refining Plants and the Existence of Japan Society of Corrosion Engineering

Kazuhiro Toba

pp. 141-142

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Article Title

Corrosion of Oil Refining Plants and the Existence of Japan Society of Corrosion Engineering

Effect of Nitrogen Pressure During Heating and Ti Content on Corrosion Resistance and Electrical Conductivity of High Nitrogen Stainless Steels Prepared by the Solution Nitriding

Ippei Shinozaki, Ryutaro Tajima, Kunio Nakatsuyama

pp. 143-148

Abstract

This study focuses on the production of high-nitrogen stainless steel by solution nitriding as a low-cost and mass-production of bipolar plates for PEFCs. We investigate the effect of nitrogen pressure during heating on the corrosion resistance and contact resistance of high-nitrogen stainless steels. In the solution nitriding of 22Cr ferritic stainless steel, higher nitrogen pressure promoted austenitization of the matrix phase and improved corrosion resistance. However, much higher nitrogen pressure promoted the coarsening of nitrides on the surface and reduced corrosion resistance.

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Effect of Nitrogen Pressure During Heating and Ti Content on Corrosion Resistance and Electrical Conductivity of High Nitrogen Stainless Steels Prepared by the Solution Nitriding

Structure of Rust Layer of Pre-rusted Carbon Steel Coated with Cellulose Nanofiber Dispersion Coatings Containing Nickel Sulfate

Taro Nohara, Kazutaka Mukoyama, Tetsusei Kurashiki, Koushu Hanaki, Masato Yamashita, Hiroaki Tsuchiya, Shinji Fujimoto

pp. 149-152

Abstract

Rust structure on carbon steel coated with cellulose nanofiber dispersion resin containing nickel sulfate was investigated after corrosion under repeated dry and wet conditions. X-ray diffraction and electrochemical measurements were performed to evaluate the rust composition and anticorrosion properties of the rust layer. It was found that the proportion of stable α-FeOOH increased, especially with the addition of nickel sulfate. The decrease in corrosion rate might be due to the increase in mass fraction of α-FeOOH.

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Structure of Rust Layer of Pre-rusted Carbon Steel Coated with Cellulose Nanofiber Dispersion Coatings Containing Nickel Sulfate

Influence of Temperature on Stress Corrosion Cracking Susceptibility of Carbon Steel in Sodium Hydrogen Carbonate Aqueous Solution Assuming Upper Limit of Carbonate Concentration in Geological Disposal Environment

Rieko Takahashi, Naoki Taniguchi

pp. 153-163

Abstract

Slow strain rate test (SSRT) was performed for a rolled carbon steel in NaHCO3 aqueous solutions at various temperatures in the range of 303-393 K. Selected concentrations of NaHCO3 between 0.1 and 0.5 mol・dm-3 are assumed to be the upper limit of carbonate concentration in groundwater in a geological disposal environment. As the results, no obvious influence of temperature on mechanical properties such as fracture strain ratio were observed, but SCC susceptibility based on ratio of SCC fracture area increased at relatively low temperatures of 303 K and 323 K. It was suggested that the reason for the higher SCC sensitivity of the steel at lower temperatures was due to slower repassivation at lower temperatures. Regarding the type of SCC, intergranular SCC was dominant at low temperatures and tended to transition to transgranular SCC at higher temperatures.

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Article Title

Influence of Temperature on Stress Corrosion Cracking Susceptibility of Carbon Steel in Sodium Hydrogen Carbonate Aqueous Solution Assuming Upper Limit of Carbonate Concentration in Geological Disposal Environment

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