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材料と環境 Vol. 67 (2018), No. 8

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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キーワードランキング

21 Nov. (Last 30 Days)

材料と環境 Vol. 67 (2018), No. 8

設備の医者

龍岡 照久

pp. 309-310

DOI:

10.3323/jcorr.67.309

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Ris

Ⅳ．各種環境での電気化学測定―海水中の炭素鋼に対する電気防食条件の評価法―

望月 紀保

pp. 311-317

DOI:

10.3323/jcorr.67.311

抄録

An example of evaluating such important parameters in cathodic protection （CP） as protection potential, protection current density and time variation in cathodic polarization characteristic, was elucidated for carbon steels in seawater as a typical case of diffusion-control of dissolved oxygen. Following the analyses of cathodic polarization characteristic with time, behavior of the galvanic CP using Al-alloy anode was simulated by using the proper ties of potentiostatic CP.

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Ⅳ．各種環境での電気化学測定―海水中の炭素鋼に対する電気防食条件の評価法―

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Ris

Ⅳ．各種環境での電気化学測定―海水中の微生物影響下でのステンレス鋼の電気化学反応―

天谷 尚

pp. 318-322

DOI:

10.3323/jcorr.67.318

抄録

The examples for the measurement using electrochemical technique in seawater environment are described in this article, especially in the natural seawater which contains the microorganisms. The noticeable feature of the electrochemical behavior of stainless steels in the natural seawater is the ennoblement of open circuit potential （Ecorr）, and this ennoblement can be considered as the fundamentals of Microbiologically Influenced Corrosion （MIC） of stainless steels in natural seawater.

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Ⅳ．各種環境での電気化学測定―海水中の微生物影響下でのステンレス鋼の電気化学反応―

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Ris

外部電源法による電気防食のアノード埋設深さが埋設金属体に及ぼす干渉影響評価

鴻野 太郎, 西田 蓉子, 中里 直人, 一色 一希, 中村 康朗, 梶山 文夫

pp. 324-330

DOI:

10.3323/jcorr.67.324

抄録

In order to clarify the relationship between the anode buried depth and the interference effect in a cathodic protection of impressed current system, evaluation by field tests and the finite element analysis were carried out. Evaluation parameters of the interference effect were the ground surface potential distribution formed by an anode and a cathode, and the internal current in a simulated underground metallic utility. Changes of these parameters were measured and observed by change of the buried depth of the anode. As a result, when protection current was small and the distance between the underground metallic utility and the cathode was 1 m, it showed that interference effect did not depend on anode buried depth.

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外部電源法による電気防食のアノード埋設深さが埋設金属体に及ぼす干渉影響評価

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Ris

高炉スラグ混合セメント系防食塗料の防食特性に関する電気化学的検討

天野 佳絵, 森山 実加子, 池田 幹友, 日比野 誠, 貝沼 重信

pp. 331-335

DOI:

10.3323/jcorr.67.331

抄録

In this study, the influence of chemical factors of anticorrosion paint blended with blast furnace slag mixed cement on rust prevention effect was evaluated electrochemically. The blast furnace slag mixed cement provides an alkali atmosphere in the rust preventive layer and protects steel from invasion of corrosive agents. The rust preventive effect is emphasized when used in combination with nitrite. As a condition for nitrite to exhibit rust prevention effect, strong alkali and nitrite / chloride concentration ratio of ［NO2－］/［Cl－］≧1 are necessary. Sulfate ions required smaller amount of nitrite ions than chloride ions.

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高炉スラグ混合セメント系防食塗料の防食特性に関する電気化学的検討

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ステンレス鋼板の大気腐食現象における結露生成・乾燥挙動の実験室的解析

西田 修司, 石井 知洋, 藤澤 光幸, 杉原 玲子

pp. 336-345

DOI:

10.3323/jcorr.67.336

抄録

The rusting of stainless steel in an atmospheric environment is mainly caused by dew droplets. However, the dew behaviors such as dew forming and drying that lead to rusting have not been fully clarified yet. In this study, the dew behaviors were precisely analyzed by the in-situ microscopic observation under the atmospheric condition simulating real environment.The dew forming process progresses with 2 phenomena: the growth of the single droplet and the coalescence with another one. The mass of the sea salt in a single droplet increases by these phenomena.The dew drying process is divided into three stages: the pinning stage when the contact angle of the droplet decreases, the de-pinning stage when the contact area of the droplet decreases, and the self-pinning stage when the contact angle decreases furthermore. At the self-pinning stage, the salt starts to precipitate and the rust forms under and beside the precipitation.It is considered that those behaviors of dew forming and drying cause the formation of the rusting pattern on the stainless steel; a number of small rusted points are distributed uniformly.

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ステンレス鋼板の大気腐食現象における結露生成・乾燥挙動の実験室的解析

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Bibtex

Ris

酸性水溶液中における沈殿インヒビターの抑制機構についてのHSAB則に基づく考察

荒牧 國次

pp. 346-349

DOI:

10.3323/jcorr.67.346

抄録

Inhibition mechanisms of many corrosion inhibitors in deaerated acid and oxygenated neutral solutions have been discussed on the basis of the hard and soft acids and bases principle （HSAB principle）. However, inhibition effects of precipitation inhibitors such as propargyl alcohol CH≡CCH2OH, bismuth （III） ion, Bi3＋ and benzylthiocyanate, C6H5CH2SCN, which are effective for corrosion of metals in the acid solutions have not been described. In this paper, the inhibition mechanisms of these precipitation inhibitors in aqueous acid solutions are discussed based on the HSAB principle.

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酸性水溶液中における沈殿インヒビターの抑制機構についてのHSAB則に基づく考察

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