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Zairyo-to-Kankyo Vol. 63 (2014), No. 4

ISIJ International
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ONLINE ISSN: 1881-9664
PRINT ISSN: 0917-0480
Publisher: Japan Society of Corrosion Engineering

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Zairyo-to-Kankyo Vol. 63 (2014), No. 4

Corrosion of Carbon Steel in Aqueous Solution

Toshio Shibata

pp. 109-115

Abstract

Corrosion process of carbon steel in aqueous solution under the atmospheric environment and the oxygen depleted environment has been reviewed by focusing the corrosion film formed on carbon steel in neutral pH. In the neutral solution under the atmospheric condition which contains oxygen, the critical pH to form the corrosion film and the precipitation ratio of dissolved iron ions depending on pH and the parabolic growth rate law were discussed. Under oxygen depleted environment, H2O works as oxidizing agent to oxidize Fe to produce Fe3O4 film with production of H2 gas. At high temperatures, the dissolution process of the Fe3O4 film controls the corrosion rate, whereas, at lower temperatures, the film growth process controls the corrosion rate and a steady dissolution rate of Fe3O4 film determines the corrosion rate after long exposure time.

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Article Title

Corrosion of Carbon Steel in Aqueous Solution

Present State and Visions of Evaluation Methods for Atmospheric Corrosion

Tadashi Shinohara

pp. 116-120

Abstract

Atmospheric corrosion commonly initiates and develops under thin water films formed by dew or rain drops. A composition of water film depends on the air pollutant deposition rate, and changes with the humidity and temperature conditions of the atmosphere. Many sensors and the measurement techniques have been developed to evaluated corrosivities in atmospheric environments and corrosion behaviors in those environments. In this paper, the present state and visions of atmospheric corrosion researches are discussed based on the roles of water and deposits and environmental factors which are evaluated by those sensors and measurement techniques.

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Present State and Visions of Evaluation Methods for Atmospheric Corrosion

The State of the Art on Passivation and Passive Films

Toshiaki Ohtsuka

pp. 121-126

Abstract

The recent investigation on passivation and passive oxide film of metals was reviewed. The development of analytical techniques and apparatuses are introduced. In the recent two decades, Raman spectroscopy, SPM, and radiation X-ray spectroscopy are widely applied. For the passive oxide films on iron, the composition of γ-Fe2O3- Fe3O4 has been detected. The following themes were discussed; mechanism of the oxide film growth and dehydration of the passive oxide film. Future prospects on the investigation on passivation and passive oxide film were described in which development of the in-situ techniques in sub nm levels with a quite high response was stressed.

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Article Title

The State of the Art on Passivation and Passive Films

Recent Scientific Progress of High Temperature Corrosion in Japan

Toshio Narita

pp. 127-131

Abstract

Recent research progress of high temperature corrosion and protection in Japan was summarized in groups of Al2O3 scale, synchrotron radiation method, water vapor effect, metal dusting, hot corrosion, halogen vapor effect, simulation method and analyses, breakaway phenomena, interaction between stress and oxidation behavior, refractory metals, TiAl, and coatings (Pt addition, DBC system, coating on TiAl, Electrolytic deposition from fused salts.

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Recent Scientific Progress of High Temperature Corrosion in Japan

Recent Progress and Future Directions in Studies on Localized Corrosion

Nobuyoshi Hara

pp. 132-137

Abstract

Recent studies on localized corrosion of corrosion-resistant metals and alloys are reviewed from the viewpoint of the development of new techniques that enable in situ and real-time observation of changes in morphology and solution chemistry during the initiation process of localized corrosion. Some examples of application of the new techniques are shown, focusing on the initiation of pitting, crevice corrosion and stress corrosion cracking on stainless steels.

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Recent Progress and Future Directions in Studies on Localized Corrosion

RBM towards Risk Based Corrosion Engineering

Jun'ichi Sakai

pp. 138-144

Abstract

Based on the current tendency in early 21th century regarding the plenty of the occurrence of failures in the field of social and industrial infrastructures, the importance of RBM and its expected future are mentioned. From the view points of the necessarily of environmental conservation and natural resources preservation, change of the maintenance technology, concept of RBM, current situation of risk based corrosion technology and its systemization, activities of JSPS #180 committee (Risk based asset management committee) and the technologies which should be improved in the near future for better maintenance are introduced.

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RBM towards Risk Based Corrosion Engineering

銅管の腐食防食に関するここ数十年の研究と将来展望

山田 豊, 水谷 佳一, 井上 行雄

pp. 158-162

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Article Title

銅管の腐食防食に関するここ数十年の研究と将来展望

長繊維強化セラミックス基複合材料の腐食防食技術の変遷と将来展望

北岡 諭

pp. 165-169

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Article Title

長繊維強化セラミックス基複合材料の腐食防食技術の変遷と将来展望

環境サイドから見た腐食防食技術の課題と展望:原子力エネルギーの利用

山本 正弘, 佐藤 智徳

pp. 193-198

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Article Title

環境サイドから見た腐食防食技術の課題と展望:原子力エネルギーの利用

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