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

Zairyo-to-Kankyo Vol. 61 (2012), No. 7

  • How to Transmission Knowledge of Corrosion and Protection to Next Generation

    pp. 261-262

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    DOI:10.3323/jcorr.61.261

  • Life Cycle Management of Port Structures - VII

    pp. 263-268

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    DOI:10.3323/jcorr.61.263

    In the port of Kamsar, the PW method has been used for assessing the repair methods of the structure. The assessment requires cashflow data, which should normally include costs and incomes. If all the costs and incomes in a cashflow are discounted to their PW values using the chosen discount rate (r) and then summed, the result is the PW value of the cashflow. And there are some variations of the PW equation corresponding to the costs and incomes in a cashflow.
    In accordance with the relationships between discount factors and time for different rates, it is supposed that the future is too uncertain to justify costing beyond 30 years. In practice, the lives of concrete bridges have to be significantly longer. For this problem, a tapering discount rate has been proposed which may be 8% up to 20 years but thereafter it tapers linearly down to 3%.
    In this paper, the variations of the PW equation, the terms on the PW, and the application of a tapering discount rate to the port structure in Kamsar are shown.
  • Dissolution of Dy2O3 and Nd2O3 by Electrolysis of Fused Na2SO4 and the Recovery of Dy and Nd

    pp. 278-282

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    DOI:10.3323/jcorr.61.278

    The dissolution behavior of Dy2O3 and Nd2O3 powders under the control of the O2− activity of fused Na2SO4 by electrochemical polarization of platinum electrode was investigated. The solubility of Dy2O3 and Nd2O3 in fused Na2SO4 increased in the anodic potential region, while their solubility did not increase in the cathodic potential region. The both oxides were subject to acid dissolution. The cathodic current density in the molten salt after the acid dissolution of both the oxides was higher than that in the molten salt without the oxide dissolution. Therefore, it was found that the cathodic reduction reaction of dissolving metal ion occurred. It was observed that Dy and Nd were deposited on electrode surface by potentiostatically cathodic polarization using the molten salt after the oxide dissolution experiment.
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  • Numerical Simulations for Time-dependent Corrosion Surfaces of Unpainted Carbon Steel Plates in Atmospheric Corrosive Environments Using Spatial Statistical Techniques

    pp. 283-290

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    DOI:10.3323/jcorr.61.283

    Many severe corrosion damages have been reported in steel structures constructed in a period of high economic growth. To ensure the safety of such structures, it is important to devise a method how corrosion develops in the service. However, method of predicting such behavior has not yet been established. In this research, semi-variogram analyses were carried out on time-dependent corrosion surfaces of unpainted steel plates exposed to atmospheric environment to clarify the spatial autocorrelation structures and their time-dependence. In addition to this, by using the autocorrelation structures and an ordinary kriging technique, method of spatial statistical simulation for the time-dependent corrosion surfaces in various atmospheric corrosive environments was proposed. Moreover, example of the relationship between mean and maximum corrosion depths was proposed on the basis of simulated results of time-dependent corrosion surfaces of unpainted carbon steel plates.

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