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材料と環境 Vol. 57 (2008), No. 8

ISIJ International
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オンライン版ISSN: 1881-9664
冊子版ISSN: 0917-0480
発行機関: Japan Society of Corrosion Engineering

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材料と環境 Vol. 57 (2008), No. 8

海洋鋼構造物の電気防食用アルミニウム合金陽極の設計手法

眞弓 勝彌

pp. 340-346

抄録

The anode design technique used widely by the cathodic protection with the galvanic anode system such as the marine steel structures was explained. Firstly, it introduced the design technique with a present galvanic anode system, and the problem was arranged. Next, the ideal way of the design technique for based on the electrochemistry further the enumeration of an overseas design method, the difference, and the example was considered. Finally, it proposed the design technique that conformed to the realities and was able to be applied on the site by adding some corrections to a present design technique.

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海洋鋼構造物の電気防食用アルミニウム合金陽極の設計手法

Characterization of Reaction of Green Rust with Foreign Ions using X-ray Absorption Fine Structure

Shigeru Suzuki, Kozo Shinoda, Masugu Sato, Shinji Fujimoto, Masato Yamashita, Hiroyuki Konishi, Takashi Doi, Takayuki Kamimura, Tamotsu Hashimoto, Katsuya Inoue

pp. 353-357

抄録

Measurements of X-ray absorption fine structure (XAFS), that is X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS), were performed for characterizing the reactions of hydrosulphate green rust (GR) with copper or nickel sulphate ions. Fe K edge XANES spectra showed that a part of Fe(II) in GR2 was oxidized by the addition of copper sulphate ions, while Fe(II) in GR was not oxidized by the addition of nickel sulphate ions. Cu K edge and Ni K edge XANES spectra showed that copper sulphate ions were reduced to zero charge copper in the GR suspension, whereas nickel sulphate ions were not reduced. Radial structural functions for iron obtained from Fe K edge EXAFS spectra indicated that the structure of GR consisted of corner sharing of structural units formed by FeO6 octahedra. Radial structural functions for copper and nickel also indicated that copper sulphate ions were transformed to metallic copper with the face-centered cubic structure in the GR suspension, whereas the local structure of nickel sulphate ions were unchanged. XANES and EXAFS data of GR oxidized by a H2O2 solution were also investigated for comparison.

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ゴムからのアウトガスによる銀の微小腐食挙動解析(第1報)

面田 真孝, 大鹿 泰造, 酒井 潤一, 石川 雄一

pp. 358-365

抄録

Corrosion factors which influence the corrosion of silver by outgassed sulfur species from vulcanized rubber have been investigated by means of quartz crystal microbalance technique (QCM) and cathodic reduction technique. Silver sulfide was the only corrosion product identified during all the tests. Corrosion progressed linearly with time and the corrosion rate did not depend on humidity, but depended markedly on the temperature and the volume of rubber contained. In addition, it is clarified that the corrosion rate varies according to the types of rubber and even among various chroloprene products. Thus it is considered that the corrosion behavior of silver with vulcanized rubber is determined by the concentration of the sulfur gas species outgassed from the rubber. The free sulfur in the rubber is assumed to be the source. It may be suggested that the outgassing of sulfur gas is determined by diffusion of sulfur molecule Sx (x=2−8) in the rubber and this diffusion process determined the corrosion rate of silver.

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ゴムからのアウトガスによる銀の微小腐食挙動解析(第1報)

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