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ONLINE ISSN: 1881-9664
PRINT ISSN: 0917-0480

Zairyo-to-Kankyo Vol. 69 (2020), No. 10

  • Novel Coronavirus, “Annus Mirabilis”, and beyond Innovation

    pp. 257-258

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    DOI:10.3323/jcorr.69.257

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    Readers Who Read This Article Also Read

    1. Corrosion of Carbon steel in Tap Water (Ⅰ)New Corrosion Index Based on Water Quality Zairyo-to-Kankyo Vol.69(2020), No.10
  • Evaluation of the Decamethyleneimine Softness as a Base

    pp. 259-261

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    DOI:10.3323/jcorr.69.259

    The softness of decamethyleneimine (CH210 NH as a base was evaluated using the relationship between the inhibition efficiency, I and the softness as a base, En. The value thus obtained was En=2.43, remarkably high, depending on π-characterized unshared pair of electrons at the N atom caused by strain in the ring.
  • Effects of Metal Constituents Adhering to Steel Plate for Improving the Corrosion Resistance of Coating defective.

    pp. 262-270

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    DOI:10.3323/jcorr.69.262

    Coated steel structures are periodically re-coated due to deterioration of the coated film. To obtain a good resistance to corrosion after re-coating requires a fully sufficient removal of rust and residual film from the steel plate surface, through preparation of that surface. Clarification of the post-coating corrosion resistance of steel plate with an adherence of metal constituents deriving from the plated film and wire material will presumably provide knowledge useful for establishing the optimal method for surface preparation. This study consequently examined the effect exerted on post-coating corrosion resistance by metal constituents adhering to the steel plate surface. It found that coated steel plate whose surface had been prepared with a zinc-plated wire brush yielded a good resistance to corrosion as compared to other coated steel plate. To determine the cause, an examination was made from the perspectives of electrochemical properties, composition analysis, and surface free energy. The results indicated the possibility that corrosion products in the slight traces of zinc adhering to the steel plate may have curtailed the progress of corrosion by acting as a barrier to the diffusion of oxygen.
  • Corrosion of Carbon steel in Tap Water (Ⅰ)New Corrosion Index Based on Water Quality

    pp. 271-276

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    DOI:10.3323/jcorr.69.271

    A new method to evaluate the corrosivity of tap water to carbon steel has been proposed. Corrosion tests for the tap waters sampled at 49 locations throughout Japan were conducted. Average corrosion rate vw and maximum one vmax were measured. Relatively close relationship of vw and vmax to concentration of SiO2 and SO42- were found. On the other hand, the corrosion rates showed slight dependence on concentrations of Cl and HCO3. These facts are contradictory to the conventional knowledge. Furthermore, the authors surmised that [SO42-]/[SiO2], named SS ratio, was an effective Corrosion Index. SS ratio showed closer relationship to vw and vmax than Langelier Index, Ryznar Stability Index and Larson-Skold Index. The authors succeeded in expressing vw and vmax as a function of only SS ratio.
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    1. Novel Coronavirus, “Annus Mirabilis”, and beyond Innovation Zairyo-to-Kankyo Vol.69(2020), No.10

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