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Zairyo-to-Kankyo Vol. 73 (2024), No. 8

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

Backnumber

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Zairyo-to-Kankyo Vol. 73 (2024), No. 8

Effects of Si in Water on Corrosion Behavior of Hot-dip Galvanizing

Koji Iwata, Shinichi Satoh

pp. 188-193

DOI:

10.3323/jcorr.73.188

Abstract

Effects of temperature and concentration of silicate anion in water on corrosion behavior of hot-dip galvanizing were investigated by immersion test, surface analysis, and cross-sectional observation. Immersion test using ion-exchanging water indicated that the corrosion rate decreased due to deterioration of water quality. X-ray fluorescence analysis revealed that much more Si exist on surface of hot-dip galvanizing sample after immersion test using deteriorated water compared to clean water. Now we prepared corroding liquid by adjusting the concentration of silicate anion using distilled water and sodium silicate in order to confirm the effect of concentration of silicate anion on corrosion rate by immersion test. In this test, higher concentration of silicate anion led to lower corrosion rate as well as in the immersion test using ion-exchanging water. Moreover, the influence on the corrosion inhibition by silicate anion was larger in corroding liquid at 60℃ than at 25℃. Glow discharge optical emission spectrometry revealed that more Si existed in the corrosion products on surface of hot-dip galvanizing immersed in 60℃ than in 25℃ water, and the thickness of corrosion products containing Si was about 20-30 nm by cross-sectional SEM image.

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Effects of Si in Water on Corrosion Behavior of Hot-dip Galvanizing

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Visualization of Microscopic Hydrogen Diffusion in Polycrystalline Pure Ni Using an Ir Complex

Saya Ajito, Hiroshi Kakinuma, Motomichi Koyama, Eiji Akiyama

pp. 194-199

DOI:

10.3323/jcorr.73.194

Abstract

Microscopic hydrogen visualization has long been required to clarify the hydrogen embrittlement mechanism of metallic materials. In this study, hydrogen diffusion depending on microstructure in polycrystalline pure nickel film was successfully visualized using an Ir complex, whose color changes with hydrogen. The hydrogen flux in nickel was found to be large at random grain boundaries and small inside grains and at coincidence site lattice grain boundaries.

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Visualization of Microscopic Hydrogen Diffusion in Polycrystalline Pure Ni Using an Ir Complex

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Effect of Diffusion Rate of Oxygen on Soil Corrosion and Evaluation of that in Soil

Kenta Fujihashi, Ryosuke Nakagami, Wataru Oshikawa

pp. 200-209

DOI:

10.3323/jcorr.73.200

Abstract

Soil corrosion rate for architecture and civil engineering is regarded as 0.02 mm/year regardless of the soil. However, it is considered that corrosion rates of each soil are different because soil properties such as particle size, water content, chemical composition and pH are different. In this study, we measured dissolved oxygen diffusion coefficient of each soil and each water content and evaluated the charge transfer resistance of each dissolved oxygen concentration by AC impedance method, to investigate the effect of dissolved oxygen diffusion on soil corrosion.

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Effect of Diffusion Rate of Oxygen on Soil Corrosion and Evaluation of that in Soil

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