著者

細井 祐三

出版者

公益社団法人 腐食防食学会

雑誌

Zairyo-to-Kankyo (ISSN:09170480)

巻号頁・発行日

vol.56, no.10, pp.439-446, 2007-10-15 (Released:2008-03-25)

参考文献数

40

被引用文献数

4 7

著者

春名 匠 庄司 裕樹 鹿島 和幸 上村 隆之 幸 英昭

出版者

公益社団法人 腐食防食学会

雑誌

Zairyo-to-Kankyo (ISSN:09170480)

巻号頁・発行日

vol.61, no.3, pp.113-119, 2012 (Released:2012-10-31)

参考文献数

28

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湿潤・乾燥環境中におけるさび付き炭素鋼の吸湿・放湿挙動を定量的に測定することができる装置を開発した.さび付き炭素鋼を試料にして湿度を制御した空気を導入した容器内に設置し,吸湿・放湿に伴う試料の質量変化を精密電子天秤で連続的に測定した.それと同時に容器内の湿度をデジタル湿度計で測定した.湿度が90%以上の空気中では,試料の質量はさびの吸湿によって急激に放物線的に増加し,やがて試料表面への水分の付着によって徐々に直線的に増加した.試験を続けると質量の振動が認められた.突然の質量減少は一部のさび片を含んだ水滴の落下に対応し,その後の直線的な質量の増加は水分の再付着に対応した.90%以下の湿度における質量変化は90%以上の湿度のときと同様であったが,試料からの水滴の落下は認められなかった.湿度88%の空気中で長時間試験を行うと,試料に吸収・付着した水分の質量は試験時間に依存せず,新しく生成したさびの質量は時間の経過とともに直線的に増加することがわかった.また,さびの質量増加速度すなわち腐食速度は厚い水膜中に存在する溶存酸素の拡散が律速したカソード反応速度に対応することが示唆された.

著者

松橋 亮 伊藤 叡 佐藤 栄次

出版者

Japan Society of Corrosion Engineering

雑誌

Zairyo-to-Kankyo (ISSN:09170480)

巻号頁・発行日

vol.40, no.11, pp.747-753, 1991-11-15 (Released:2009-11-25)

参考文献数

6

被引用文献数

7 8

---

To clarify the physical meaning of general corrosion resistance index (GI) obtained through the alloy contents on general corrosion rate of stainless steels in sulfuric acid solution, the study of the effect of alloy contents, immersion time and temperature on the general corrosion rate was carried out in 10.2mol·kg-1 sulfuric acid solution. It was assured that dependence of alloy contents on corrosion rate of stainless steels was ascribed to the apparent activation energy obtained by Arrhenius plot, and from the thermodynamical consideration of GI value, GI was expressed as a function of alloy contents through the change of apparent activation energy due to corrosion reaction.

著者

松永 是

出版者

Japan Society of Corrosion Engineering

雑誌

Zairyo-to-Kankyo (ISSN:09170480)

巻号頁・発行日

vol.40, no.10, pp.687-693, 1991-10-15 (Released:2009-11-25)

参考文献数

19

---

Magnetic bacteria synthesize magnetic particles which are aligned in chains and enveloped by a membrane. Magnetic particles isolated from magnetic bacteria could be useful because they are small in size, covered with lipid bilayers and do not aggregate. We have studied the mass culture of magnetic bacteria and their characterization and the application of bacterial magnetic particles. This review describes some of the recent advances towards bio-technological and medical applications of bacterial magnetic particles. Enzymes and antibodies may be immobilized on bacterial magnetic particles. These enzyme-magnetic particle and antibodymagnetic particle conjugates may then be used to produce biosensors for glucose and immunoglobulins, respectively. Bacterial magnetic particles have also been introduced into red blood cells by cell fusion, and into leucocytes by phagocytosis. Moreover, gene cloning system of magnetic bacteria was also developed.

著者

稲田 文夫 米田 公俊 森田 良 藤原 和俊 古谷 正裕

出版者

公益社団法人 腐食防食学会

雑誌

Zairyo-to-Kankyo (ISSN:09170480)

巻号頁・発行日

vol.57, no.5, pp.218-223, 2008 (Released:2008-11-08)

参考文献数

12

被引用文献数

2 6

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配管減肉に対する流体現象の寄与について説明した.流れ加速型腐食(FAC)とエロージョンでは,壁面への流体作用力が全く異なることを示した.FACの主要因子である乱流物質移動は熱伝達とアナロジがあり,壁面近傍の粘性底層内の分子輸送が支配的とするモデルが実用的である.さらに物質移動は数値流体解析コードで求められる.最後にこれらの手法によりオリフィス,エルボにおける物質移動現象を予測した結果を説明した.

著者

中森 正治 京 将司 石橋 修 吉岡 隆幸 成田 敏夫

出版者

公益社団法人 腐食防食学会

雑誌

Zairyo-to-Kankyo (ISSN:09170480)

巻号頁・発行日

vol.60, no.3, pp.123-125, 2011-03-15 (Released:2011-09-01)

参考文献数

3

著者

兒島 洋一 岸元 努 辻川 茂男

出版者

Japan Society of Corrosion Engineering

雑誌

Zairyo-to-Kankyo (ISSN:09170480)

巻号頁・発行日

vol.45, no.5, pp.305-314, 1996-05-15 (Released:2009-11-25)

参考文献数

25

被引用文献数

1

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The rate of uniform corrosion, the likelihood of pitting and crevice corrosion for aluminum, Al, in white wine were investigated in this paper. In commercial wines, the K2S2O5 is commonly added to induce free-SO2 which reduces the dissolved oxygen and acts as a fungicide in the wine. The spontaneous electrode potential of Al, ESP, in a deaerated wine containing less than 1ppm of free-SO2, at 25°C was measured to be about -600mV vs. SCE. Since the K2S2O5 is an oxidizing agent for the Al, the ESP was ennobled with the addition of K2S2O5 reaching -520mV with a concentration of 1000ppm K2S2O5. The uniform corrosion rate was measured to be 13μm/y at 25°C and this rate was found to depend on the temperature with an activation energy of 42kJ/mol. However, this rate was found to have no dependency on the electrode potential within the ESP range. The critical pitting potential, VC, PIT, measured in the wine containing 25ppm of Cl- was -370mV which was more noble than the ESP, and the pitting corrosion can not occur. The repassivation potential for the growing crevice corrosion, ER, CREV, was measured to be -530mV. It was also found that this potential does not depend on either the temperature or the concentration of K2S2O5. It was observed that the ESP became more noble than the ER, CREV with the addition of 800ppm K2S2O5 at 25°C. At a lower temperature, however, the ESP became more noble than the ER, CREV when a lesser amount of K2S2O5 were added. An effective method to decrease the rate of uniform corrosion is to reduce the holding temperature; however, to effectively prevent the crevice corrosion at these lower temperatures, the K2S2O5 concentration must be kept below 100ppm.

著者

土田 敬之

出版者

Japan Society of Corrosion Engineering

雑誌

Zairyo-to-Kankyo (ISSN:09170480)

巻号頁・発行日

vol.53, no.1, pp.44-49, 2004-01-15 (Released:2011-12-15)

参考文献数

9

被引用文献数

3 3

---

無水のアルコールはアルミニウムとアルコキシド反応を起こすことが知られている. しかし, 複数のアルコールが混在した場合の挙動は報告されていない. また, 微量の水の存在でアルコキシド反応を防止することが知られている. そこで筆者は (1) 共沸点近傍の混合アルコール溶液とアルミニウムの反応, (2) 混合アルコール溶液とアルミニウムとの反応を抑制する最低含水濃度の関係を調べることを目的とした. 353K, 373K, 393Kの各温度における72時間処理という条件で, 炭素数2~4のアルコールすなわちエタノール, ノルマルプロパノール, イソプロパノール, ノルマルブタノール, イソブタノールの5種類のアルコールを用い, 混合アルコール溶液50mlと純アルミニウム (JIS-A1085) 板片をSUS304製容器の中で反応させた. 試験の結果, 単体成分のアルコールに比べ混合アルコール溶液の場合, 反応温度が低下する傾向が見られた. また, 混合アルコール溶液の方が反応を抑制する最低含水濃度が高くなる傾向があることを発見した. これらの結果をアルコールの溶解現象の立場から考察を加え, 混合アルコール溶液中のアルコールクラスターのサイズ, 構造及び安定性が反応に大きく関与している可能性を示唆した.

著者

宇城 工

出版者

Japan Society of Corrosion Engineering

雑誌

Zairyo-to-Kankyo (ISSN:09170480)

巻号頁・発行日

vol.41, no.5, pp.329-340, 1992-05-15 (Released:2009-11-25)

参考文献数

48

被引用文献数

7 7

---

This paper summarizes recent trends in seawater-resistant stainless steels. These steels can be classified into 4 types; ferritic stainless steels which contain more than 25%Cr-3%Mo, austenitic stainless steels which contain more than 20%Cr-24%Ni-5%Mo, N-bearing austenitic stainless steels which contain more than 20%Cr-17%Ni-4%Mo-0.1%N, and duplex stainless steels which contain more than 25%Cr-6%Ni-3%Mo-0.1%N. The high-alloy ferritic stainless steels exhibit the best corrosion resistance to seawater among these types of steels. The superiority of the ferritic stainless steels is attributable to the difference in the effect of Cr on respective anodic polarization behavior of ferritic and austenitic stainless steels. At present, the ferritic stainless steels are mainly used in the condenser tubes of power plants, and the N-bearing austenitic stainless steels mainly in the pipe work of offshore platforms. Ultra-high nitrogen containing austenitic stainless steels, high-alloy duplex stainless steels manufactured by the powder metallurgical process, and anodic and catholic chromating stainless steels have also been studied as new seawater-resistant stainless steels.

著者

板垣 昌幸 猿渡 麗子 渡辺 邦洋

出版者

Japan Society of Corrosion Engineering

雑誌

Zairyo-to-Kankyo (ISSN:09170480)

巻号頁・発行日

vol.51, no.9, pp.410-417, 2002-09-15 (Released:2011-12-15)

参考文献数

8

被引用文献数

5 9

---

The electrochemical impedance for infinite and finite diffusion processes was described, and the locus of the impedance was discussed through comparison of the experimental results with the theoretical ones. The charge transfer resistance Rct and the polarization resistance Rp were compared with the current i and the slope of the polarization curve for the reduction of K3Fe(CN)6. The physical meanings of Rct and Rp in the diffusion impedance were discussed. It was confirmed that Rct-1 was related to the reaction rate. The theory to apply the diffusion impedance to the analysis of corrosion reaction was revealed.

著者

小野 昇一 熊谷 幹郎 帆足 興次

出版者

Japan Society of Corrosion Engineering

雑誌

Zairyo-to-Kankyo (ISSN:09170480)

巻号頁・発行日

vol.40, no.5, pp.315-322, 1991-05-15 (Released:2009-11-25)

参考文献数

10

被引用文献数

1 1

---

Influence of dissolved oxygen and temperature on corrosion and elution behaviors of Si3N4 ceramics containing 5wt% MgO as sintering aid in high-temperature pure water were studied using the once-through type experimental loop. Exposure tests were carried out under two different dissolved oxygen concentrations of below 20μg/l and 8mg/l. Exposure temperature was elevated gradually from 120°C to 200°C and then to 275°C, where the indicated temperature was kept for 8 days. The results suggested that dissolved oxygen did not promote corrosion of Si3N4 ceramics, although the weight loss of specimen after exposure was influenced largely by temperature and the amount was increased by almost one order of magnunitude with temperature change. These were considered to be caused by the reaction of Si3N4 grain with H2O, of which rate was increased with temperature. The specimen exposed at 275°C was largely leached and its amount of weight loss attained up to 52mg/cm2 under low dissolved oxygen condition. Then a part of corrosion products remained on the surface and formed the porous corrosion film. In these processes Mg tended to be accumulated in the leached layer. On the other hand, Si3N4 grain was scarecely eluted at 120°C, but the grain boundary contaming Mg was selectively eluted to test solution.

著者

南谷 林太郎

出版者

公益社団法人 腐食防食学会

雑誌

Zairyo-to-Kankyo (ISSN:09170480)

巻号頁・発行日

vol.64, no.1, pp.14-19, 2015-01-15 (Released:2015-06-17)

参考文献数

20

被引用文献数

2 4

---

H2S-NO2-SO2-Cl2環境での銀に対して,新しい大気腐食メカニズムを提案した.銀の大気腐食は,環境中の硫化水素H2Sが二酸化窒素NO2により酸化され生じた還元性硫黄S8による化学反応,この反応で余剰したH2S,NO2が溶解した銀表面の水膜中での電気化学反応により進行する.大気腐食メカニズムに基づき,温湿度,汚染ガスとしてH2S,NO2,Cl2をパラメータに,銀の腐食速度式を提案した.この速度式を公開されている銀の腐食データ110件に適用して,腐食ガス試験環境,実暴露試験環境における銀の大気腐食速度は2倍以内の誤差で推定された.

著者

鈴木 茂

出版者

公益社団法人 腐食防食学会

雑誌

Zairyo-to-Kankyo (ISSN:09170480)

巻号頁・発行日

vol.57, no.2, pp.66-69, 2008-02-15 (Released:2008-08-12)

参考文献数

27

被引用文献数

4 4

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鉄さびの形成機構に関する最近の研究について概説した.グリーンラスト(GR)は鉄基合金の中間的な腐食生成物として時々観察されるが,それらは空気酸化によりゲーサイトやレピドクロサイトなどのオキシ水酸化鉄に変態しやすい.これは,GR が二価の鉄イオンを含んでおり,水溶液中で三価の鉄イオンに変化するためである.ここでは,これらの GR の構造や変態の特徴について述べた.

著者

元田 慎一

出版者

公益社団法人 腐食防食学会

雑誌

Zairyo-to-Kankyo (ISSN:09170480)

巻号頁・発行日

vol.67, no.4, pp.150-155, 2018-04-15 (Released:2018-09-27)

参考文献数

28

---

本稿ではACMセンサの出力原理と基本的特性,および再現性に優れる作製プロセスを解説した.これによりACMによる大気腐食モニタリングを理解する一助としたい.

著者

滝 千博 作山 秀夫

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.151-158, 1995-03-15 (Released:2009-11-25)

参考文献数

17

被引用文献数

1

---

When higher corrosion resistance than commercially pure titanium is required, Ti-0.15%Pd alloy is used because of insensitivity to crevice corrosion in NaCl solutions and lower corrosion rate in non-oxidizing acid solutions. Since it has been needed to find out substitute alloys having lower price than Ti-0.15%Pd and comparable corrosion resistance, binary titanium alloys were investigated. Among seventeen elements studied, only Ni and Ru were found to increase corrosion resistance in remarkable manner. Crystallographic analyses showed that most of nickel in a Ti-Ni alloys is precipitated as intermetallic Ti2Ni within α-phase matrix, and the intermetallic compound was found to be effective to bring the corrosion potential into the passive range. However, Ti-Ni alloys are not sufficient in terms of corrosion resistance, if compared with Ti-0.15%Pd alloy. As for Ti-Ru alloys, though they exhibit comparable corrosion resistance to Ti-0.15%Pd alloy, there seemed to have no merit in terms of material cost.

著者

面田 真孝 大鹿 泰造 酒井 潤一 石川 雄一

出版者

公益社団法人 腐食防食学会

雑誌

Zairyo-to-Kankyo (ISSN:09170480)

巻号頁・発行日

vol.57, no.8, pp.358-365, 2008-08-15 (Released:2009-03-17)

参考文献数

24

被引用文献数

1 3

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加硫ゴムから放出される硫黄ガス種による銀の微小硫化腐食に影響を与える腐食要因をQCM法,定電流カソード還元法を用いて調べた.同定できた腐食生成物は,Ag2Sのみであった.また,腐食は時間と共に線形で進行し,腐食速度は温度,ゴムの体積には依存するが,相対湿度には依存しなかった.さらに腐食速度は,ゴムの種類により異なる上,同一のクロロプレンゴム間で比較しても製品により異なることを明らかにした.これらから,加硫ゴムによる銀の腐食挙動は,ゴム中の遊離硫黄を発生源とする硫黄ガスにより決定されるものと考えられる.そして,硫黄ガスのアウトガスはゴム中の遊離硫黄分子Sx(x=2~8)の拡散が支配し,この拡散過程が銀の腐食速度を決定しているものと推察される.

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

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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

大塚 俊明

出版者

公益社団法人 腐食防食学会

雑誌

Zairyo-to-Kankyo (ISSN:09170480)

巻号頁・発行日

vol.63, no.4, pp.121-126, 2014-04-15 (Released:2014-11-14)

参考文献数

48

被引用文献数

1 2

---

最近の金属不働態化ならびに不働態皮膜の研究に関してレビューした.また,最近の分析手法ならびに装置を紹介した.最近20年ではラマン分光法,走査型プローブ顕微鏡(SPM),ならびにX線分光が広く使われるようになってきている.鉄の不動態皮膜に関しては,γ-Fe2O3-Fe3O4の組成が検出されている.以下の点に関して議論された:不動態酸化物皮膜の成長機構ならびに不動態皮膜の脱水和.不動態化ならびに不動態皮膜の研究における将来の課題として,充分に速い応答を持ち,サブnmレベルでのin-situ測定手法の開発が望まれる.

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

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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