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材料と環境 Vol. 68 (2019), No. 7

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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  1. Vol. 73 (2024)

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  6. Vol. 68 (2019)

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  29. Vol. 45 (1996)

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  30. Vol. 44 (1995)

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  32. Vol. 42 (1993)

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  33. Vol. 41 (1992)

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  34. Vol. 40 (1991)

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キーワードランキング

21 Nov. (Last 30 Days)

材料と環境 Vol. 68 (2019), No. 7

機械工学科で環境材料学を担当して

齋藤 博之

pp. 161-161

DOI:

10.3323/jcorr.68.161

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機械工学科で環境材料学を担当して

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Ris

硬いおよび軟らかい酸塩基の法則に基づいて考えた酸性溶液中におけるインヒビターの腐食抑制機構

荒牧 國次

pp. 162-168

DOI:

10.3323/jcorr.68.162

抄録

Inhibition mechanisms of adsorption and precipitation inhibitors for metallic corrosion in acid solutions were discussed based on the hard and soft acids and bases principle. A markedly high inhibition efficiency of decamethyleneimine（CH2）10 NH was explained by the formation of a stable chemisorption bond between Fe surface（soft acid） and N atom of the imine（soft base） caused by strain in the ring. Inhibition of cationic electrostatic adsorption inhibitors, back-donation inhibitors, dibenzylsulfoxide, propargyl alcohol, bismuth ion and benzylthiocyanate were also discussed on the basis of the principle.

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硬いおよび軟らかい酸塩基の法則に基づいて考えた酸性溶液中におけるインヒビターの腐食抑制機構

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Ris

大気腐食環境下における鋼材の腐食挙動および水素侵入挙動の同時モニタリング

原田 宏紀, 面田 真孝, 大塚 真司, 河野 崇史

pp. 171-177

DOI:

10.3323/jcorr.68.171

抄録

To develop high strength steel with high resistance to hydrogen embrittlement, it is necessary to clarify the mechanism of hydrogen entry into steel. Hydrogen entry is caused by corrosion reaction under atmospheric environment. However, the relationship between hydrogen entry and corrosion behavior, and the influence of environmental factors on the hydrogen entry such as temperature, relative humidity（RH） and salt deposition are not fully understood. In this study, simultaneous monitoring of both hydrogen entry and corrosion rate was employed to investigate the influence of environmental factors on hydrogen entry and corrosion behavior. The monitoring was conducted under the atmospheric exposure test.As a result, hydrogen entry and corrosion rate increased with increase of amount of salt deposition. Corrosion rate increased with increase of RH, whereas hydrogen entry had a maximum at medium RH. The mechanism of promotion of the hydrogen entry at medium RH range was assumed to be related to lowering pH due to hydrolysis of Fe3＋ in high ［Cl－］ environment.

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大気腐食環境下における鋼材の腐食挙動および水素侵入挙動の同時モニタリング

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Ris

インフラ劣化検知を目的とした電磁波伝搬型塗布式センサの基礎検討

松永 恵里, 美濃谷 直志, 津田 昌幸

pp. 178-181

DOI:

10.3323/jcorr.68.178

抄録

This paper presents a coating-type sensor for more efficient remote inspection of infrastructures that are large in scale and have complicated shapes. For crack detection, electromagnetic waves at around 0.2～2.0 GHz penetrated the coating sensor film, and we observed the reflected waves. Measurement and simulation results confirmed that the sensor detects cracks occurring in the coated films with lengths of about 15％ on one side of the sensor.

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インフラ劣化検知を目的とした電磁波伝搬型塗布式センサの基礎検討

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Ris

高温高湿－冷凍サイクルによる塗装鋼板の電気化学インピーダンススペクトルの変化

堀江 俊男, 北原 学

pp. 182-186

DOI:

10.3323/jcorr.68.182

抄録

Painted steel panel uses for automotive body. Therefore, assessments of painted steel corrosion protecting life are important. Automotive body is exposed to various atmospheric environments. Atmospheric environmental factors （temperature, humidity, adhering salt type, etc.） are influenced on corrosion protecting life of the painted steel. In order to evaluate the corrosion protection performance in a short time, we study evaluation of coating film degradation using EIS （Electrochemical Impedance Spectroscopy）. As a result, it was found that coating thickness, adhesion salt type and presence/absence of freezing process may contribute to degradation of corrosion protection performance.

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高温高湿－冷凍サイクルによる塗装鋼板の電気化学インピーダンススペクトルの変化

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屋外促進暴露試験を用いたZn-30mass％ Al溶射鋼の腐食特性評価

中野 敦, 押川 渡, 米沢 昇

pp. 187-193

DOI:

10.3323/jcorr.68.187

抄録

A four-year atmospheric exposure test was performed on steel with Zn-30mass％Al thermal-spray coating using the accelerated atmospheric exposure test, and atmospheric corrosion properties was evaluated. X-ray diffraction results showed that the corrosion products which formed on the coating film as a result of the accelerated atmospheric exposure test were the same as those which formed in a typical atmospheric exposure test. The amount of corrosion of the spray-coated film in the accelerated atmospheric exposure test was promoted by approximately 1.5 to 2.0 times compared to the atmospheric exposure test.

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屋外促進暴露試験を用いたZn-30mass％ Al溶射鋼の腐食特性評価

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Ris

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