著者
佐藤 教男
出版者
Japan Society of Corrosion Engineering
雑誌
Zairyo-to-Kankyo (ISSN:09170480)
巻号頁・発行日
vol.44, no.3, pp.183-191, 1995-03-15 (Released:2009-11-25)
参考文献数
19
被引用文献数
2 2

The electrode potential, which plays an important role in corrosion, may be defined by either the electronic or the ionic energy level in the electrode. The electronic electrode potential corresponds to the real potential of electron, i.e. the real free energy for electron transfer from the point at the outer potential of aqueous solution to the point inside the electrode, which is found to be a linear function of the electrode interfacial potential difference. Under equilibrium condition, the electronic potential represents the Fremi level of equilibrium redox electron in the solution for electron transfer electrodes, and the hypothetical Fermi level associated with ion transfer equilibrium for ion transfer electrodes. With localized corrosion, the corrosion potential at the cathode site is more positive than that at the anode site. This corrosion potential difference does not correspond to any local difference in the Fermi level inside the corroding metal, but to the difference in the electrode interfacial potential difference at the two sites.
著者
押川 渡 篠原 正 元田 慎一
出版者
Japan Society of Corrosion Engineering
雑誌
Zairyo-to-Kankyo (ISSN:09170480)
巻号頁・発行日
vol.52, no.6, pp.293-298, 2003-06-15 (Released:2011-12-15)
参考文献数
18
被引用文献数
18 35

To estimate concentration and thickness of water film formed on metal surface in atmospheric environment, relative humidity (RH) data in equilibrium with various concentrations of strong electrolyte solutions were calculated with available thermodynamic data. The activity coefficient of water (fw(X)) for the solution with molar fraction of water (X) could be given as a function of ionic strength of the solution, which was determined by mean activity coefficient data in literatures for electrolytes in the solution. RH values obtained as RH(%)=100×fw(X)·X were fitted well with measured values of these solutions in each literatures, for example NaCl, MgCl2, Na2SO4, Mg(NO3)2 and so on. RH values for solutions with various contents of Na-MgCl ternary system were also calculated as NaCl-MgCl2 mixed solution. The calculated RH values were also fitted well with measured data. Using the relationship between density and concentration of the solution, the thickness of water film was also calculated. When the sea salt is put on 1g/m2, while the thickness of water film reaches 3-30μm in the range of relative humidity is larger than 75%, it remains 0.3-0.7μm in the range of relative humidity is smaller than 75% where NaCl solid state deposition occurs.
著者
木谷 滋
出版者
Japan Society of Corrosion Engineering
雑誌
Zairyo-to-Kankyo (ISSN:09170480)
巻号頁・発行日
vol.41, no.9, pp.639-641, 1992-09-15 (Released:2009-11-25)
参考文献数
18
被引用文献数
1
著者
遠藤 一彦 松田 浩一 大野 弘機
出版者
Japan Society of Corrosion Engineering
雑誌
Zairyo-to-Kankyo (ISSN:09170480)
巻号頁・発行日
vol.42, no.11, pp.734-741, 1993-11-15 (Released:2009-11-25)
参考文献数
53
被引用文献数
2 4

This paper reviews the corrosion of metallic restorations in the oral environment and its adverse effects on patients. Typical corrosion damages of metallic restorations observed in the oral cavity were shown and the factors affecting the biodegradation of these restorations were discussed. The biological side effects reported in the literature, especially an allergy to metallic ions dissolved from the restoration were described.
著者
久保内 昌敏
出版者
Japan Society of Corrosion Engineering
雑誌
Zairyo-to-Kankyo (ISSN:09170480)
巻号頁・発行日
vol.51, no.12, pp.542-548, 2002-12-15 (Released:2011-12-15)
参考文献数
30
被引用文献数
2 1

Corrosion behavior of polymeric materials was studied. The form of degradation of organic materials were classified and arranged, then the behavior and mechanism of it were explained from unified approach method from relativity of the diffusion and reaction rate and the structure of corrosion product point of view. Furthermore, form an analogy of metallic corrosion theory, the degradation of polymeric materials mainly on thermosetting resins was explained.
著者
田尻 桂介 神畠 尚文
出版者
Japan Society of Corrosion Engineering
雑誌
Zairyo-to-Kankyo (ISSN:09170480)
巻号頁・発行日
vol.49, no.10, pp.579-584, 2000-10-15 (Released:2011-12-15)
参考文献数
18

Corrosion Protection for Aerospace Products is quite important from the point of flight safety and long term service. This document describes the corrosion protective surface treatment technologies such as Anodizing, Alodizing, Cadmium plating, Painting traditinally used in the Aerospace Industry. New trend of environmentally compliant coating technologies for surface treatment is also mentioned about.
著者
森田 昌行
出版者
Japan Society of Corrosion Engineering
雑誌
Zairyo-to-Kankyo (ISSN:09170480)
巻号頁・発行日
vol.48, no.10, pp.621-625, 1999-10-15 (Released:2009-11-25)
参考文献数
14

Organic and inorganic materials that are used in practical lithium ion batteries have been described from a viewpoint of their stability in the battery system. The lithium ion battery consists of a carbonaceous negative electrode, an organic solution dissolving lithium salt, and a lithiated transition-metal oxide positive electrode. The active material of the positive electrode, LiMn2O4, a promising candidate of the relief for LiCoO2, degrades in organic solutions containing LiPF6 as the electrolyte salt. The partial substitution of Mn by other trivalent metal improves the durability of the material. The Cu current collector of the negative electrode is susceptible to environmental cracking under the charging condition. The Al current collector of the positive electrode is generally stable in LiPF6 solutions with organic solvents, but it is susceptible to pitting corrosion under highly polarized conditions. The lithium salts with sulfonyl groups assist the pitting corrosion of Al.
著者
藤崎 辰夫
出版者
Japan Society of Corrosion Engineering
雑誌
防蝕技術 (ISSN:00109355)
巻号頁・発行日
vol.10, no.11, pp.517-518, 1961
著者
岡村 廸夫
出版者
Japan Society of Corrosion Engineering
雑誌
防食技術 (ISSN:00109355)
巻号頁・発行日
vol.34, no.7, pp.406-413, 1985-07-15 (Released:2009-10-30)
参考文献数
7
被引用文献数
1

Computers could be produced in quantities but interfaces are not. For any effective, productive, expandable, flexible and reliable computerized systems, standardized interface is a must. The IEEE-488 interface may look too complicated at first sight, it is understandable also for nonelectrician as its applications concern. Up to 15 interfaces or devices can be connected together into one bus system and it's speed is over 10 times faster than popular RS-232C. The 1-bus length is typically expandable to 20m, even more than 1km with special options.On the darker side, many capabilities of IEEE-488 could cause many mistakes on both usage and design. Larger systems may you build, if succeeded in getting more reliable devices and less noisier layout. For professionals and manufactures, it is strongly recommended to follow “A guidline for IEEE-488”** to get good compatibility, instead of inventing a new version to which nobody can talk.
著者
波戸崎 修 小山 昇
出版者
Japan Society of Corrosion Engineering
雑誌
防食技術 (ISSN:00109355)
巻号頁・発行日
vol.39, no.12, pp.709-716, 1990-12-15 (Released:2009-10-30)
参考文献数
35

A review of the investigations on “Cold Fusion” is given. A brief history of developments of cold fusion researches is described. Representatives of excess heat generation, tritium production and neutron emmission in mainly electrolysis of D2O, i. e., Fleischmann-Pons experiments, are involved. Other experimental results suggesting the occurrence of a fusion reaction and the models proposed to account for the observations are also given.
著者
馬場 文雄 鈴木 紹夫 瀬尾 眞浩
出版者
Japan Society of Corrosion Engineering
雑誌
Zairyo-to-Kankyo (ISSN:09170480)
巻号頁・発行日
vol.44, no.11, pp.606-611, 1995-11-15 (Released:2009-11-25)
参考文献数
18

Effects of ferrous ions on the growth and activity of sulfate-reducing bacteria (SRB) have been investigated using biological and analytical techniques for a better understanding of its metabolism in corrosive media with high contents of metal ions. In-situ gravimetry by the quartz crystal microbalance (QCM) technique was also applied to examine the sulfide-producing process in the medium. The growth of SRB increased with increasing ferrous ion concentration up to 0.01M and retarded above 0.01M. In the low concentration region (0.00036M-0.01M) ferrous ions enhanced the growth of SRB, whereas in the high concetration region (0.03M-0.7M) ferrous ions gave the opposite effect due to high osmotic pressure. The FeS producing ability was closely related to the growth of bacteria, therefore it seems that SRB accelerates the corrosion of metal in the medium including 0.01M ferrous ions. QCM technique was able to detect sensitively the amount of FeS attached on the electrode surface, which was proportional to the total amount of FeS in the medium. Thus it was found that QCM technique is powerful for monitoring the FeS producing process.
著者
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
出版者
Japan Society of Corrosion Engineering
雑誌
材料と環境 : zairyo-to-kankyo (ISSN:09170480)
巻号頁・発行日
vol.60, no.9, pp.402-410, 2011-09-15
被引用文献数
1 4

嫌気性条件(N<sub>2</sub>(80%)+CO<sub>2</sub>(20%))の海水培地において,金属鉄を電子供与体として,CO<sub>2</sub>を電子受容体かつ炭素源として利用可能なMPAは,純鉄試験片を腐食した.主要な腐食生成物はFeCO<sub>3</sub>であった.このMPAが,同様に金属鉄を電子供与体として利用可能なSRBと共存することで,MPA単独の場合よりも腐食が約2.3倍促進されることが明らかになった.MPAとSRBが共存する場合の腐食生成物も,MPA単独による腐食生成物と同様にFeCO<sub>3</sub>であった.<br>また,嫌気性条件(N<sub>2</sub>(80%)+CO<sub>2</sub>(20%))での腐食速度と,引き続く好気性条件(空気下)での腐食速度を比較した結果,MPA単独,あるいは,MPAとSRBが共存する場合の腐食速度は,嫌気性条件(N<sub>2</sub>(80%)+CO<sub>2</sub>(20%))の方が高い値となった.<br>本研究で腐食試験に使用したMPAとSRBは同一の原油タンクのスラッジから単離されたものである.油井など高濃度のCO<sub>2</sub>とCl<sup>−</sup>が存在する実際の嫌気性腐食環境においては,金属鉄を電子供与体として,CO<sub>2</sub>を電子受容体や炭素源として利用可能なMPAと同じく金属鉄を電子供与体として利用可能なSRBが共存している可能性も想定される.したがって,金属鉄を電子供与体として利用可能なMPAとSRBの共存による微生物腐食に対しても留意すべきと考えられる.