著者
柴田 芳昭 今濱 敏信 和気 敏治 関根 功 川瀬 哲也 城元 孝之 湯浅 真
出版者
Japan Society of Corrosion Engineering
雑誌
Zairyo-to-Kankyo (ISSN:09170480)
巻号頁・発行日
vol.41, no.8, pp.525-534, 1992-08-15 (Released:2009-11-25)
参考文献数
36

The effect of tannic acid on the corrosion of mild steel in boiler systems was investigated by physicochemical methods using an autoclave and a test boiler. Tannic acid was found to be a good oxygen scavenger at pH 11 as well as hydrazine and sodium sulphite. Tannic acid inhibited corrosion of steel (i) at room temperature and atmospheric pressure and (ii) at high temperature and pressure. The maximum inhibition efficiency was about 97%. The inhibiting behavior of tannic acid at pH 7 was different from that at pH 11. At pH 7, tannic acid acted as an adsorption-type inhibitor and suppressed catholic reaction of corrosion of steel. At pH 11, tannic acid inhibited corrosion of steel not only as an effective oxygen scavenger but also an effective Schikorr reaction promoter (formation of Fe3O4). Tannic acid is believed to be an effective inhibitor in boiler systems.
著者
高須 芳雄 松田 好晴
出版者
Japan Society of Corrosion Engineering
雑誌
防食技術 (ISSN:00109355)
巻号頁・発行日
vol.31, no.3, pp.148-155, 1982-03-15 (Released:2009-10-30)
参考文献数
26
被引用文献数
1 1

Oxidation behaviors of Fe, Co, Ni, Cu, and four Ni-Cu alloys (81, 64, 42, and 21% Ni) have been studied in 10 Torr (exceptionally, 1×10-3 Torr) of NO at the elevated temperatures from 580-780°C. The oxidation behaviors of such metals and alloys have been examined also in O2 at the same pressures and temperatures for comparison. Various methods such as microgravimetry, X-ray diffractometry, X-ray photoelectron spectroscopy, Auger electron spectroscopy, and Ion micro analysis were adopted for this investigation. The results obtained are summarized as follows: (1) The oxidation of Fe and Co in NO obeyed the cubic and the parabolic rate laws, respectively; while those of Ni and Cu obeyed the linear rate law. The oxidation characteristics (rate, rate law, or activation energy) of these metals in NO were much different from those in O2. (2) Nickel was rapidly oxidized in NO accompanied with the expansion of samples which was caused by the preferential oxidation of grain boundary. (3) The oxidation of Cu in NO was rate-determined by the dissociation of NO on the oxide surface. (4) The oxide formed on Fe, Co, Ni, and Cu in NO were Fe3O4, CoO, NiO, and Cu2O, respectively; while in O2 were Fe3O4 and Fe2O3, CoO, NiO, and Cu2O, respectively. (5) In the oxidation of Ni-Cu alloy system in NO, an accelerating oxidation was observed for Ni-rich alloys. The total amount of oxygen uptake of the Ni-rich alloy was greater than those of the Cu-rich alloys after the accelerating oxidation in NO occurred. (6) The selective oxidation characteristics for Ni-Cu alloy system during the oxidation in NO was also different from those in O2. In the former case, preferential oxidation of Ni occurred, resulting in the formation of NiO-rich oxide layer on the alloy. For the Ni-rich alloy and copper was scarcely oxidized forming only a small amount of Cu2O in the outer layer. As has generally been reported, the oxide film on Ni-Cu alloy formed in O2 consisted of two distinct layers; i. e. the component of the outer layer was copper oxide (mainly CuO) and the inner was NiO.
著者
杉本 克久
出版者
Japan Society of Corrosion Engineering
雑誌
Zairyo-to-Kankyo (ISSN:09170480)
巻号頁・発行日
vol.48, no.11, pp.673-680, 1999-11-15 (Released:2009-11-25)
参考文献数
30
被引用文献数
8 7

Electrochemical Impedance Spectroscopy (EIS) has been known as a powerful tool for analyzing electrode reaction mechanism. In this review the history of EIS, the definition of electrochemical impedance, the general concept of transfer function, and the measurement method of electrochemical impedance using a transfer function analyzer are first introduced. Then, analytical methods of impedance spectra using electrical equivalent circuits and the kinetic theory of electrochemical reactions are stated. Finally, the future scope of EIS is briefly given.
著者
細矢 雄司 篠原 正 押川 渡 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.54, no.8, pp.391-395, 2005-08-15 (Released:2011-12-15)
参考文献数
13
被引用文献数
6 6

炭素鋼の大気腐食における環境の腐食性について, 付着海塩が吸水することによって表面に形成される水膜の厚さの影響を中心に検討した.付着海塩への吸着水量を種々の条件下で実測し, 形成された液膜の濃度を計算値と比較して熱力学計算が実験結果をよく再現する条件を得た. また種々の条件下で炭素鋼の腐食試験を行い, 熱力学計算で導出される水膜の厚さdと腐食速度CRとの関係について調べた. d=50μm近傍においてCRは最大値約0.07mgm-2s-1を取ることを見い出した.
著者
丸山 俊夫
出版者
Japan Society of Corrosion Engineering
雑誌
Zairyo-to-Kankyo (ISSN:09170480)
巻号頁・発行日
vol.45, no.8, pp.495-498, 1996-08-15 (Released:2009-11-25)
参考文献数
4
被引用文献数
1 1
著者
石川 達雄
出版者
Japan Society of Corrosion Engineering
雑誌
Zairyo-to-Kankyo (ISSN:09170480)
巻号頁・発行日
vol.46, no.7, pp.411-417, 1997-07-15 (Released:2009-11-25)
参考文献数
30
被引用文献数
1 1

The formation mechanism of ferric oxide hydroxides, α-, β- and γ-FeOOH, is described in view of evolution of colloidal particles in aqueous solutions. The surface characterization of FeOOH particles by IR spectroscopy is cited. Finally, the adsorption interaction of H2O, SO2 and NO with the particles is explained based on their surface structures.
著者
岩田 誠一
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.336-342, 1991-05-15 (Released:2009-11-25)
参考文献数
19

Various problems concerning corrosion in ULSI (Ultra-large-scale Integration)'s are discussed. After a brief discussion on Al-line corrosion in plastic packages, two problems connected with ULSI manufacturing are explained and discussed. One is the selection of heat treatment atmosphere which does not oxidize tungsten gate electrodes, but can oxidize silicon at the same time. The other is the high-temperature stability of thin SiO2 films in refractory metal/SiO2/Si structures. Namely, the degradation of SiO2 occurs by H2 atmosphere and by the reaction between SiO2 and Si.
著者
田中 良平
出版者
Japan Society of Corrosion Engineering
雑誌
防食技術 (ISSN:00109355)
巻号頁・発行日
vol.25, no.4, pp.233-250, 1976-04-15 (Released:2009-10-30)
参考文献数
89
被引用文献数
3
著者
川原 雄三
出版者
Japan Society of Corrosion Engineering
雑誌
Zairyo-to-Kankyo (ISSN:09170480)
巻号頁・発行日
vol.54, no.5, pp.183-194, 2005
被引用文献数
11

廃棄物発電プラントでは高効率, 低公害, メンテナンスフリーなどの性能向上を図る上で構成材料の高温腐食防止技術が鍵となっている. ごみの高カロリー化, 環境規制強化などの社会情勢変化に応じて腐食環境が過酷化し, 燃焼改善, 最適設計などによる腐食性の軽減がなされてきた. さらに, ボイラ蒸発管を主体に金属溶射, 溶接肉盛などの耐食コーティングを用いた寿命向上技術が開発, 適用され, また, 過熱器においても310系ステンレス鋼, 高Cr高Mo・Niベース合金管の利用と腐食メカニズムの解明により, 現在では673K/3.9MPaを超える蒸気条件が可能となっている. 本解説ではおよそ30年にわたる廃棄物発電プラントの腐食防止および耐食材料に関連した主な実用技術の開発と今後の課題について説明する.
著者
Jianshun Huang Tadashi Shinohara Shigeo Tsujikawa
出版者
Japan Society of Corrosion Engineering
雑誌
Zairyo-to-Kankyo (ISSN:09170480)
巻号頁・発行日
vol.48, no.9, pp.575-582, 1999-09-15 (Released:2009-11-25)
参考文献数
13
被引用文献数
8 15

Protection of carbon steel (C-steel) from atmospheric corrosion by TiO2 coating was demonstrated. TiO2 coating, as a non-sacrificial anode, absorbed solar energy and transformed it to electricity so as to provide cathodic protection to the substrate steel. A TiO2-Fe galvanic couple was developed as an ACM (atmospheric corrosion monitor) sensor to evaluate the photoeffect and corrosion behavior of TiO2/C-steel in atmosphere. For the TiO2-Fe couple, type 1 sensor, an anodic output related to the anodic dissolution of the coupled Fe electrode was detected in the dark (night time), whereas in the bright (day time) the output changed from anodic to cathodic. Moreover, the cathodic output remained for a long time after stopping illumination for the multi-layer coating, TiO2 (amorphous)/TiO2 (anatase)/Ti-Fe oxide/α-Fe2O3/C-steel, type 2 sensor. Enviromental conditions in terms of relative humidity, RH, and amount of deposited sea salt, Ws, where 1mm wide Fe coupled to 5mm wide TiO2 could be protected were determined based on the following examinations:a) visual observation for degree of rust developed on the Fe electrodes, for the type 2 sensorb) comparison of corrosion potential of carbon steel with photo potential of TiO2 electrode measured by Kelvin probe, c) polarity of output current for the type 1 sensor.It is concluded that the carbon steel could be protected from atmospheric corrosion by TiO2 coating under conditions of lower amount of deposited sea salt and lower relative humidities.
著者
間宮 富士雄
出版者
Japan Society of Corrosion Engineering
雑誌
Zairyo-to-Kankyo (ISSN:09170480)
巻号頁・発行日
vol.40, no.2, pp.122-133, 1991-02-15 (Released:2009-11-25)
参考文献数
5
被引用文献数
4 4

As you know well, the kinds of organic solvent cleaning are various available and petroleum solvent cleaning, non-petroleum solvent cleaning, finger print removing and vapour degreasing are very popular methods. But, recently environmental contamination is very severe for restriction due to destroy of ozone by fron, etc. Therefore, this is mentioned for details of kinds for organic solvent cleaning and prevention of environmental contaminations.
著者
Haruo Tomari
出版者
Japan Society of Corrosion Engineering
雑誌
Zairyo-to-Kankyo (ISSN:09170480)
巻号頁・発行日
vol.46, no.4, pp.202-209, 1997-04-15 (Released:2009-11-25)
参考文献数
38

This review describes current trend in research and development of a slight degree of corrosion of stainless steel for semiconductor processing. Although organic materials such as polyvinyl chloride have been used for ultra-pure water piping in semiconductor processing, it has been pointed out that there are several problems of impurities release from the piping surface, insufficiency of heatproofing in heat-sterilizing etc. It has been reported that the amount of metal dissolution from electro-polished stainless steel in ultra-pure water was very small, and that controlled oxidation treatment after electropolishing gave more excellent corrosion resistance. On the other hand, the electropolished stainless steel pipe are used mainly for gas piping in semiconductor processing. However, it is reported that it is subject to a slight degree of corrosion in corrosive chlorine gas and other halogen gases. Moreover, it is proved that the corrosion resistance in halogen gases is improved by controlling the heat treatment condition of oxygen partial pressure and other factors, and the pre-heating suface polishing methods.
著者
松橋 亮 安保 秀雄 阿部 征三郎 紀平 寛
出版者
Japan Society of Corrosion Engineering
雑誌
防食技術 (ISSN:00109355)
巻号頁・発行日
vol.36, no.9, pp.578-585, 1987-09-15 (Released:2009-10-30)
参考文献数
7
被引用文献数
5 7

The mechanism of corrosion of stainless steels in highly concentrated sulfuric acid was studied by the electrochemical method and surface analysis as EPMA and Laser-Raman Spectroscopy. Cyclic potential changes occured in this system about between -0.2V (SCE) (active state) and 0.2V (SCE) (passive state). The anodic reaction was determined as the metal dissolution in both the active and the passive state. The cathodic reaction in the active state near -0.2V (SCE) was mainly dominated by the reduction of hydrogen ion which was clearly indicated by the evolution of hydrogen gas. On the other hand, catholic reaction at the passive state about 0.2V (SCE) was determined as the reduction of molecular sulfuric acid resulting in the formation of sulfur and water. By the analysis of EPMA, precipitated sulfur was found on the specimen surface polarized at 0.2V (SCE) potentiostatically. The in-situ observation of corroding surface by Laser-Raman spectroscopy indicated the formation of precipitated sulfur on the metal surface at the corrosion potential. Cyclic changes in corrosion potentials were considered due to the following mechanisms; dissolved metal ion at the active state formed metal sulfate films on the metal surface, leading the corrosion potential to the passive state. Inversely at the passive state, water as the product of the cathodic reaction accelerated the dissolution of the metal sulfate film to move the corrosion potential to the active state.
著者
三沢 俊平
出版者
Japan Society of Corrosion Engineering
雑誌
防食技術 (ISSN:00109355)
巻号頁・発行日
vol.32, no.11, pp.657-667, 1983-11-15 (Released:2009-10-30)
参考文献数
80
被引用文献数
13 16
著者
高橋 樟彦
出版者
Japan Society of Corrosion Engineering
雑誌
防食技術 (ISSN:00109355)
巻号頁・発行日
vol.23, no.11, pp.557-572, 1974-11-15 (Released:2009-10-30)
参考文献数
83
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

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 2

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 6

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 6

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.