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材料と環境 Vol. 65 (2016), No. 11

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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  32. Vol. 42 (1993)

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材料と環境 Vol. 65 (2016), No. 11

水素用アルミニウム合金の使用環境と国際標準化に向けた試験方法

伊藤 吾朗

pp. 432-437

DOI:

10.3323/jcorr.65.432

抄録

Status quo has been described on the national project for global standardization to define usable aluminum alloys for the use related hydrogen, focusing on the testing method. In the project, test of stress corrosion cracking under humid gas (HG-SCC, Humid Gas Stress Corrosion Cracking) has been proposed as the most suitable testing method. In 6000-series alloys with excess Si, those with and without Cu have been found to have and not to have resistance to HG-SCC, respectively. Since the knowledge on the stress corrosion cracking in 6000-series alloys is lacking compared to 7000-series alloys, further fundamental study is needed.

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水素用アルミニウム合金の使用環境と国際標準化に向けた試験方法

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電着被膜を用いた防食工法の環境依存性について

岩本 達志, 鈴木 靖庸, 弥富 政亨, 中島 朋広, 赤嶺 健一

pp. 450-453

DOI:

10.3323/jcorr.65.450

抄録

As one of anti-corrosion system for marine steel structures, there is a method using calcareous deposits from mineral ions in seawater. In this process, chemical compositions and temperature of seawater around the structures have influence on the process, quality of deposits coating in principle. So we had some experiments under actual environment in Singapore, then we investigated relationship between the applicability, anti-corrosive performance and environmental factors by comparing the results with ones in Japan. Consequently, in Singapore, chemical composition of calcareous deposits coating was different from one in Japan. But the growth rate and anti-corrosive performance of calcareous deposits coating were the same as ones in Japan, although the concentration of mineral ions and pH of seawater around test site were lower than ones in Japan. Moreover with cathodic protection, the anti-corrosive performance was maintained during experiments. These results mean that anti-corrosion system using calcareous deposits coating is effective in low tidal current speed even if water quality around structure is changed in some extent.

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電着被膜を用いた防食工法の環境依存性について

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都市ごみ焼却炉ボイラ付着灰等の高温熱物性値

篠 靖夫, 鈴木 敏夫, 久保 顕一, 基 昭夫

pp. 454-457

DOI:

10.3323/jcorr.65.454

抄録

Boiler steam conditions of MSW incinerators have recently been shifting to higher temperature and pressure to attain more efficient energy recovery from the waste. Consequently, boiler tubes are now exposed to more harmful environment than before. Flyash comprising particulate matters in the hot gas stream, part of which finally accumulates on the surface of boiler tubes, plays a crucial role in erosion and corrosion mechanism of boiler materials. However, the thermophysical properties of these substances at actual gas temperatures are not well reported. Test samples were collected from several MSW incinerators in order to clarify high temperature thermal conductivities of flyash adhered to boiler tubes, outer surface scale formed on riser tubes, and incinerated ash. Results from the measurement showed flyash adhered to riser tubes and that to superheater have respective high- temperature thermal conductivities and the thermal conductivity of outer surface scale on riser tubes has a decreasing tendency with increasing temperature. Besides, two thermal conductivity values obtained from laser flash and hot wire measurements of the identical powdered test sample presented a fairly good agreement if the difference in bulk density was taken into consideration.

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都市ごみ焼却炉ボイラ付着灰等の高温熱物性値

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酸性塩害試験における腐食挙動に及ぼす溶液濃縮過程の影響

宮原 良太, 藤林 亘江, 小森 務, 宇城 工

pp. 458-461

DOI:

10.3323/jcorr.65.458

抄録

Recently, cyclic corrosion test containing acetic acid or nitric acid has been carried out to investigate the corrosion by acid rain and the corrosion behavior of Al alloys. The effects of solution condensation on the corrosion behavior of an Al alloy and a stainless steel in these tests were investigated. The change of pH and ion concentration of Cl‒, NO3‒, CH3COO‒ with solution condensation were investigated. The polarization measurements were carried out in condensed solutions and the correspondence between the result of the CCT and that of polarization measurements was analyzed.

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酸性塩害試験における腐食挙動に及ぼす溶液濃縮過程の影響

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ギ酸銅（Ⅱ），酢酸銅（Ⅱ）水溶液中におけるリン脱酸銅管の腐食挙動

境 昌宏, 渡邊 純也

pp. 462-466

DOI:

10.3323/jcorr.65.462

抄録

Ant nest corrosion of copper occurs in organic carboxylic acid such as formic and acetic acid. Hence, it is predicted that organic carboxylic acid anions coexist with dissolved copper ions inside the pit of ant nest corrosion. In this paper, we present the results of immersion tests of phosphorous deoxidized copper tubes in copper（Ⅱ） formate and copper（Ⅱ） acetate aqueous solutions to investigate the corrosion behavior of copper in the solution containing both copper and carboxylate ions. Ant nest corrosion with irregularly branched tunnels developed for copper tubes immersed in copper formate solution, while a semispherical pit developed for copper tubes immersed in copper acetate solution. Especially, rapid progress of the corrosion in copper formate solution led to perforation of the copper tube with 0.28mm thickness in 26 days. The propagation of this corrosion corresponds to the corrosion rate of 3.9mm/y. Moreover, anodic polarization curves of the copper tube in copper formate and copper acetate solutions were measured. The anodic current density in copper formate solution increased monotonically with applied potential, while the anodic polarization curves in aerated copper acetate solution showed a drop-off in current density originating from the formation of an oxide film.

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ギ酸銅（Ⅱ），酢酸銅（Ⅱ）水溶液中におけるリン脱酸銅管の腐食挙動

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水素侵入に及ぼす表面皮膜の影響

大村 朋彦, 秋岡 幸司, 小林 憲司

pp. 467-475

DOI:

10.3323/jcorr.65.467

抄録

Effects of several types of surface films on hydrogen entry in low alloy steels were investigated using a hydrogen permeation technique. Effects of Zn plating under cathodic hydrogen charge, additions of alloying elements such as Ni, Cu and Mo in an acidic solution, and sulfide film formed in wet H2S environments were evaluated, and classified into the following two types.Zn plating drastically suppressed hydrogen entry into low alloy steel. The mechanism was considered to be a resistance against hydrogen permeation, due to small hydrogen diffusivity in Zn or small hydrogen evolution rate on Zn surface. Formation of sulfide film in a wet H2S environment was also effective for suppressing hydrogen entry according to the similar mechanism. Zn plating and sulfide film were classified into the “surface resistance type”Additions of Ni, Cu and Mo were also effective for suppressing hydrogen entry in the acidic solution. The mechanism was considered to be a change in hydrogen overpotential, not a resistance to hydrogen permeation. The decrease in hydrogen overpotential would lead to a decrease in hydrogen surface coverage. These alloying elements were considered to work as the “small hydrogen overpotential type”.In the case of the “resistance” type surface films such as Zn or sulfide, thickness of the steel plate affects the hydrogen concentration just beneath the surface film because it was determined by the balance of the diffusion of hydrogen through the surface film and the base steel.

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水素侵入に及ぼす表面皮膜の影響

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