Zairyo-to-Kankyo
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ONLINE ISSN: 1881-9664
PRINT ISSN: 0917-0480

Zairyo-to-Kankyo Vol. 70 (2021), No. 7

  • Aluminum Alloy Products Sustaining the Global Environment

    pp. 213-214

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    DOI:10.3323/jcorr.70.213

  • Stress Relaxation of the Shot-Peened Austenitic Stainless Steels at Temperatures Lower than 350℃

    pp. 217-227

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    DOI:10.3323/jcorr.70.217

    This study aims to estimate the stress relaxation of the shot-peened austenitic stainless steel storage container (called as the canister) for the used nuclear fuel, at temperatures lower than 200℃ during the long term service period (approximately 80 years). We first show the relaxation data of residual compressive stresses of the peened Type-304 and -316 steels which are aged at 340 C in air for 18,080 hours, and then the relaxation of residual stresses at temperatures lower than 500 C. We estimate that the activation energy for the stress relaxation is 84~89 kJ/mol by the Arrhenius plot of the times for the initial residual stresses to come down to 80% that of the initial stress values (called as the 80% time). We, next, compute the Larson-Müller Parameter (LMP) using the constant of 10, and determine two boundary LMP lines which separate the three relaxation levels, i.e., higher than 60% of the initial stresses, lower than 60% but higher than 30%, and lower than 30%, on the temperature vs. time diagram. We estimate that the compressive residual stresses of the shot-peened austenitic stainless steel canister will be relaxed to the stress levels higher than 30% of the initial stresses.Though the relaxation of residual stresses is closely related to the change of structure and mechanical properties of the aged stainless steels, these will be discussed in the next technical report.
  • Study on Corrosion Behavior of Stainless Steel in Atmospheric Environment by Exposure Test

    pp. 228-236

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    DOI:10.3323/jcorr.70.228

    Stainless steel is often used in atmospheric environment without anticorrosive treatment, and there have been many researches on atmospheric corrosion of stainless steel. However, the correlation between corrosion behavior of stainless steel in the atmospheric environment and environmental factors has not been sufficiently clarified. Therefore, in this study, the exposure test of 11 kinds of stainless steel was carried out at 7 exposure test sites in Japan, Vietnam, and Indonesia, and the correlation between corrosion behavior and environmental factors was investigated. As a result, it was clarified that there exists a critical pitting index in which pitting corrosion does not initiate in each environment. The effect of deposited SO2 on the critical pitting index was small, and the effect of airborne sea salt was dominant. The critical pitting index C.P.I. in the atmospheric environment could be approximated by C.P.I.=9.4 log (S)+26.7 (where S is amount of airborne sea salt, mdd). This result suggests that the increase in pitting index requires the formation of more droplets on the surface of stainless steel for pitting initiation.
  • Paint Blistering Mechanism of Steel Painted with Paint System Containing Inorganic Zinc Rich Paint

    pp. 237-245

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    DOI:10.3323/jcorr.70.237

    The paint blistering mechanism of steel painted with paint system containing inorganic zinc rich paint (ZRP) was investigated. As a result of observing the appearance and cross section of the corroded painted steel with or without ZRP, the paint blistering form changed from blister to pushing up of the paint due to generation and growth of Fe corrosion products with the progress of corrosion. ZRP corrodes prior to the paint blistering to form Zn corrosion products, reducing the cathode reaction (oxygen reduction) under paint and suppressing blister. In addition, ZRP reduces the Fe corrosion reaction at the tip of the paint blistering and makes fine Fe3O4 particles. These effects suppress the formation and growth of Fe corrosion products and suppress the paint blistering.

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