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

Zairyo-to-Kankyo Vol. 66 (2017), No. 12

  • Now and Before of Japan Society of Corrosion Engineering

    pp. 373-374

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    DOI:10.3323/jcorr.66.373

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    1. Oxide Stability Diagram of Liquid Steels – Construction and Utilization ISIJ International Vol.58(2018), No.8
  • I. Fundamental Electrochemistry of Corrosion-Electrochemical Equipments-

    pp. 375-380

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    DOI:10.3323/jcorr.66.375

    This article is a introductory guide for equipments used in electrochemical experiments. Fundamental concept of electrochemical cell, principle and basic electronic circuits of electrometer, potentiostat and galvanostat, function of lock-in amplifier used for weak signal measurement are explained.
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    1. Effect of Sulfate Ion on Corrosion Behavior of SUS316L in High Active Liquid Waste Zairyo-to-Kankyo Vol.66(2017), No.5
    2. What should be the future of our journal, "Zairyo-to-Kankyo" Zairyo-to-Kankyo Vol.66(2017), No.5
  • Surface State of Metals in Biological Environment and its Control

    pp. 381-387

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    DOI:10.3323/jcorr.66.381

    Metals are widely used for medical devices such as implants and about 80% of implants consist of metals, due to their excellent fracture toughness and durability. Metals are used for treatments in orthopedics and dentistry as well as cardiovascular treatments. Crevice and pitting corrosion is sometimes observed on stainless steel in the human body, while there are little examples of macroscopic corrosion in Ti and Co-Cr alloys. On the other hand, Ti element is detected from surrounding tissues and the mechanism of dissolution of Ti is discussed. Corrosion resistance of a metal is an essential property to acquire the biocompatibility and biofunction of the metal. Surface oxide film and surface hydroxyl groups on the film play an important role to determine the biological property. In addition, calcium phosphate formation on Ti is a key phenomenon to appear its good tissue compatibility. Surface treatment techniques to add biocompatibility and biofunction to metals, especially electrochemical treatments such as cathodic polarization, micro-arc oxidation, and electrodeposition of biofinctional molecule, are reviewed. Finally, importance of evaluation of corrosion resistance are demonstrated.
  • Analysis for Test Pieces of Weathering Steel Exposed in Mountainous Area for 27 Years

    pp. 395-400

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    DOI:10.3323/jcorr.66.395

    This study analyzed weathering steel test pieces that were exposed around the bridge in mountainous area for 27 years. In account of Ion transfer resistance method, corrosion level of the test pieces without supplementary rust controlling treatment coating is I-5 or I-4. In spite of the long exposure duration, their rust consists mostly of amorphous substance and a little α-FeOOH, which is considered to be main composition of protective rust of weathering steels. Weathering steel test pieces with supplementary rust controlling treatment coating retains coating with fading color among rust spots. In only case of top surface of the test piece horizontally exposed between girders of the bridge shows transformation of the treatment coating to rust. The test pieces with and without coating show little depletion of the thickness during 27 years, suggesting that environment of this area is mild in terms of corrosion and is suitable for weathering steel bridges, nevertheless inadequate formation of α-FeOOH.
  • Changes of Oxygen Diffusion Behavior in NaCl Thin Films Formed on Zn Sheets with Temperature

    pp. 401-404

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    DOI:10.3323/jcorr.66.401

    The oxygen reduction current in thin NaCl solution layer formed on zinc electrode was measured under an open-to-air to clarify the effect of solution layer thickness, and temperatures of environments and specimens on the oxygen transport behavior. The solution layer thickness was controlled by masking by organic tape with different thickness. Independent of temperature and solution layer thickness, a clear oxygen limiting current was observed. It was increased with reciprocal of solution layer thickness as the solution layer thickness became thinner than about 0.6 mm. It was clearly shown that combination of temperature of environment and specimen was important for oxygen transport behavior through thin solution layer.
  • CT Scanner Observation of Ant’s nest Corrosion Produced in Copper Tube

    pp. 405-408

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    DOI:10.3323/jcorr.66.405

    In air conditioning and refrigerant fields, ant's nest corrosion is known as the problem which caused by low carboxylic acid in the environments. In this study, CT scanner technology was recommended to observe the corrosion such as especially ant's nest corrosion in the view point of developed material estimation with accuracy. It is indicated that the issue of conventional cross sectional observation technologies and estimating its results.

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