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材料と環境 Vol. 60 (2011), No. 9

ISIJ International
belloff
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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21 Nov. (Last 30 Days)

材料と環境 Vol. 60 (2011), No. 9

金属の高温酸化の研究に関する省察

新居 和嘉

pp. 386-390

DOI:

10.3323/jcorr.60.386

抄録

This review surveys high temperature oxidation of materials, from the Wagner’s model to the base of development of heat resisting alloys. This article is written with an intension to give researchers and engineers a perspective of the high temperature oxidation and help to draw a clear picture in their works.

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金属の高温酸化の研究に関する省察

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Ris

水酸化ナトリウム水溶液中におけるZr, Ti, Ta, Nbの腐食挙動

本岡 隆文, 山本 正弘

pp. 394-401

DOI:

10.3323/jcorr.60.394

抄録

Corrosion behaviors of metal applicable as nuclear energy and bio-material were investigated in sodium hydroxide solutions. Tested materials were zirconium, titanium, tantalum and niobium. They were immersed in 0.1 to 6.1 mol/dm3 sodium hydroxide solutions for 48 h, and then weight loss measurement, XRD and XPS analyses were conducted. Potentiodynamic polarization curves were obtained in some solutions. The corrosion rates were greater in the order of Nb>Ta>Ti>Zr. Polarization curves showed that Ti, Ta and Zr passivated, however, Nb corroded. XRD patterns showed that Nb dissolved as niobate compounds. XPS spectra showed that Zr and Ti formed oxide films such as ZrO2 and TiO2 on their surface. SEM photographs indicated that uniform corrosion occurred for tested materials. There existed the differences of the stable species among the thermodynamic, corrosion test and surface analysis data. It is expected for expanding the thermodynamics data of these materials in the alkali region.

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水酸化ナトリウム水溶液中におけるZr, Ti, Ta, Nbの腐食挙動

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金属鉄を電子供与体として利用可能なメタン生成古細菌（MPA）と硫酸塩還元菌（SRB）の共存による鉄腐食促進作用

伊藤 公夫, 若井 暁, 鶴丸 博人, 飯野 隆夫, 森 浩二, 内山 拓, 三木 理, 原山 重明

pp. 402-410

DOI:

10.3323/jcorr.60.402

抄録

Methane Producing Archaea (MPA), which could utilize metallic iron as an electron donor and CO2 as an electron acceptor and a carbon source, corroded an iron coupon severely in seawater medium under anaerobic condition (N2(80%)+CO2(20%)). Main component of corrosion products by MPA was FeCO3. MPA corroded the iron coupon more severely when they coexisted with SRB which could also utilize metallic iron as an electron donor. Corrosion rate of the iron coupon by MPA+SRB was about 2.3 times higher than that by MPA only under anaerobic condition (N2(80%)+CO2(20%)). Main component of corrosion products by MPA+SRB was FeCO3 like that by MPA.
Corrosion rates of the iron coupon by MPA only, or MPA+SRB under anaerobic condition (N2(80%)+CO2(20%)) were higher than those under aerobic condition (Air) after the anaerobic corrosion experiments.
Therefore, corrosive effects on iron by MPA+SRB, which can utilize metallic iron as an electron donor, should be considered as cause of microbiologically influenced corrosion in the anaerobic corrosive environments like oil fields, where CO2 and Cl− are available.

mendeley

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金属鉄を電子供与体として利用可能なメタン生成古細菌（MPA）と硫酸塩還元菌（SRB）の共存による鉄腐食促進作用

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Ris

三宅島における通信設備用つり線の長期暴露試験結果

中村 真理子, 齋藤 博之, 東 康弘, 澤田 孝, 半田 隆夫, 工藤 保, 渡辺 正満, 松本 守彦

pp. 411-416

DOI:

10.3323/jcorr.60.411

抄録

Communication lines are usually composed of steel and other metallic components. For preventing corrosion of steel wire strands, Zn coating had been used. However, it became appear that some steel wire strands located in coastal areas still had been corroded. That was because air bone sea salt particles above the ocean are blown by the wind and adhere to the surface of metals. To protect steel wires against the atmospheric corrosion, Al coating was applied because of its higher corrosion resistance compared with that of Zn coating. This coating above still corroded which were at the coastal areas. Previous studies on this phenomenon showed that corrosion occurred in the interspace between the sealing tape which was used to inhibit the penetration of rain water and the wire strands. Since Japan is an island country and is surrounded by the sea, investigating the appropriate coatings for steel wire strands is important. We conducted the exposure test and compared three types of coated steel wire strands to investigate the effects of sacrificial anode on the corrosion in Miyake Island over 23 years.

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三宅島における通信設備用つり線の長期暴露試験結果

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