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

Zairyo-to-Kankyo Vol. 70 (2021), No. 4

  • Greeting from New President

    pp. 101-102

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    DOI:10.3323/jcorr.70.101

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    1. Kinetics on Formation, Growth and Removal of Alumina Inclusions in Molten Steel Tetsu-to-Hagané Vol.107(2021), No.10
  • Research on Test Methods of Promote Local Corrosion (Pitting Corrosion)

    pp. 117-121

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    DOI:10.3323/jcorr.70.117

    An accelerated corrosion test method was investigated in order to estimate the service life of coated steel. This test focused on the reduction of the thickness of steel material by reproducing the local corrosion represented by pitting. We investigated the conditions that would quickly cause heavy pitting corrosion by changing the temperature, the concentration of NaCl and the wetting and drying of the steel surface. It was found that pitting corrosion can be reproduced quickly by repeating a wet/dry cycle and locally concentrating an appropriate quantity of NaCl during the test.
  • Corrosion Behavior of Carbon Steel in the Sulfate Solutions with Mg2+

    pp. 122-125

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    DOI:10.3323/jcorr.70.122

    The corrosion behavior of carbon steel in the sulfate solutions with Mg2+ was investigated using cyclic corrosion tests and cyclic voltammetry. In the cyclic corrosion tests, the addition of Mg2+ tended to suppress corrosion of carbon steel and formed sulfur-concentrated layers between steel and rust. The results of cyclic voltammetry showed that cathode peak appeared as the number of cycles increased in the sulfate solution with Mg2+. These results suggest that the addition of Mg2+ in the sulfate solution accelerates reduction of rust and formation of sulfur-concentrated layers, and these layers suppress corrosion reactions.
  • Pot-shaped Pitting Corrosion of SUS304 Welded Coupon Immersed in Natural Seawater and Microorganism Analysis

    pp. 126-130

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    DOI:10.3323/jcorr.70.126

    Pot-shaped pitting corrosion occurred in SUS304 coupon with intact weld part immersed in natural seawater for 10 months. Removal of scale and roughness on weld part prevented severe corrosion for 10 months. Hypothetical corrosion progress mechanism by cooperative effect of iron oxidizing bacteria, Leptothrix sp., which might oxidize Fe2+ to Fe3+ and iron reducing bacteria, Shewanella sp., which might reduce Fe3+ to Fe2+ using electron directly obtained from metal by extracellular electron transfer (EET) was proposed.
  • Consideration of Repassivation Process Based on the Measurement pH in Crevice and Metal Dissolution Rate of SUS304 Stainless Steel in Artificial Seawater

    pp. 131-139

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    DOI:10.3323/jcorr.70.131

    The crevice corrosion test by two-step potentiostatic polarization and the pH in crevice (pHc) with a semiconductor chemical sensor were simultaneously measured, and the repassivation mechanism for SUS304 stainless steel were investigated.The total metal dissolution current density (imetal) of crevice corrosion is shown as the sum of the current density detected externally (iout) and inner crevice corrosion caused by hydrogen generation reaction(iin). When crevice corrosion has progressed sufficiently, there is nice correlation between iout and pHc. If there is a lot of iin, the consumption of H+ will increase and it will be easier to repassivate. The repassivation pH was 2.5 to 3.0 in both ASW and 1/10ASW. Current density threshold (10-5 A・cm-2) and relationship between pHc and potential the immobilization potential (ER) obtained from was was 80 mV(SHE) in ASW and 120 mV(SHE) in 1/10ASW, the lower Cl concentration in the external environment, ER became noble. This is because the ratio of iin in imetal is high, the consumption of H+ increases, and the effect of diffusion and dilution of anolyte makes it easy to repassivation.

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