Updated on 2025/09/30

写真a

 
TADA EIJI
 
Organization
School of Materials and Chemical Technology Professor
Title
Professor
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Degree

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Research Interests

  • 材料電気化学

  • 物理化学

  • 腐食防食工学

  • Corrosion

  • electrochemistry

Research Areas

  • Nanotechnology/Materials / Material processing and microstructure control

Education

  • Tokyo Institute of Technology   Graduate School, Division of Science and Engineering

    - 1998

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  • Tokyo Institute of Technology   Science of Engineering

    - 1998

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    Country： Japan

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  • Tokyo Institute of Technology   School of Engineering

    - 1993

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    Country： Japan

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  • Tokyo Institute of Technology   Faculty of Engineering

    - 1993

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Research History

  • 仏国ブルゴーニュ大学招聘研究員

    2007

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  • - 秋田大学工学資源学部准教授

    2007

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  • 米国オハイオ州立大学博士研究員

    2004 - 2005

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  • Akita University   Faculty of Engineering and Resource Science

    1998 - 2007

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  • Akita University Faculty of Engineering and Resource Science, Department of Materials Science and Engineering   Associate Professor

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Professional Memberships

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Papers

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MISC

Awards

  • （社）腐食防食協会進歩賞

    2007  

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    Country：Japan

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  • 英国腐食学会T.P. Hoar Award

    2005  

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  • （社）腐食防食協会三沢記念賞

    2005  

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    Country：Japan

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  • （財）手島工業教育資金団手島記念博士論文賞

    1999  

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    Country：Japan

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Research Projects

  • Correlation between electronic structure and corrosion resistance of passive film of H-charged stainless steel

    Grant number：23K04434  2023.4 - 2026.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant amount：\4810000 （ Direct Cost: \3700000 、 Indirect Cost：\1110000 ）

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  • 金属異材接合部の腐食劣化数理モデルの構築とデータ同化の実装による高精度化

    Grant number：20K05150  2020.4 - 2023.3

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    多田 英司

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    Grant amount：\4420000 （ Direct Cost: \3400000 、 Indirect Cost：\1020000 ）

    自動車などの内燃機関から排出されるCO2量を削減するには，燃費の向上に加え，車体の軽量化が重要である．自動車車体の場合は，使用量が多い鉄鋼材料に対して衝突安全性の担保と軽量化が実現できる高強度化が急務となっているが，その一方で一部の鋼材を比強度、耐食性、加工性に優れるAl合金や炭素繊維強化プラスチックなどに置き換えるマルチマテリアル化が重要な技術として期待されている．本研究では，マルチマテリアル化において問題となるガルバニック腐食について，精緻な腐食モデルを確立し，接合部分の耐久性評価に寄与する技術開発を目指している．
    ガルバニック腐食モデルの構築と評価手法の確立には，実際の測定によって大量の分極挙動データセットを準備するボトムアップ的な数値計算モデルでは対応できず，より合理的な境界条件セットの収集方法を構築すべきである．そこで，本研究では，腐食シミュレーションのためのキーとなる境界条件の整備を行う．さらに，ガルバニック腐食において現象を支配する環境因子を明確化し，それに対して時間変化する分極挙動を予測する手法を確立する．これらにより高精度な腐食シミュレーションが可能となり，ガルバニック腐食による接合部の劣化寿命予測が現実的なものとなる．
    本年度では，昨年度に引き続き，NaCl中におけるFe/Al接合対のガルバニック腐食機構の解明を目的に，種々の塩化物イオン濃度に対して，ガルバニック腐食データを交流および直流電気化学測定により収集した．また，得られたデータを基に，腐食機構を検討するとともに，観測データを表すための腐食シミュレーションを実施した．その結果，Fe/Al対の腐食機構を明確化するとともに，実測したガルバニック腐食データと腐食シミュレーション結果との差異について検討し，分極曲線の経時変化を再現することの重要性を明らかにした．

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  • Improvement of corrosion resistance of Zn-Mg-Al alloys by texture control

    Grant number：17H03400  2017.4 - 2020.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Tada Eiji

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    Grant amount：\18460000 （ Direct Cost: \14200000 、 Indirect Cost：\4260000 ）

    In this study, Zn and Zn-Mg alloys and Zn-Al-Mg alloys were prepared and their electrochemical and atmospheric corrosion properties were evaluated. As a result, it was shown that although there was no difference in the anodic reaction of each alloy, the corrosion rate was evaluated to be decreased by the combined addition of Al and Mg. In addition, a one-year exposure test was conducted on these alloys in an atmospheric corrosion environments, and it was shown that Zn-Mg alloy and Zn-Al-Mg alloy had better corrosion resistance than pure Zn. However, no clear difference was observed in the corrosion product films formed on the surface.

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  • pH measurement near the electrochemical reaction interface with the pH-sensing electrodes

    Grant number：15K14144  2015.4 - 2019.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    TADA EIJI

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    Grant amount：\3770000 （ Direct Cost: \2900000 、 Indirect Cost：\870000 ）

    This study was designed to establish the technology to measure pH near the electrochemical reaction interface such as aqueous solution corrosion of metal. In particular, the pH measurement of the electrochemical reaction interface was attempted using a metal / metal oxide electrodes having pH response characteristics. As a result, we succeeded in measuring surface pH in a simulated corrosion system for iron using Sb / Sb oxide electrode. In addition, with the aim of measuring the local pH in the vicinity of the electrochemical reaction interface, W film produced using a sputtering method showed sub-Nernstian pH response and could be uniformly deposited on the cantilever for AFM.

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  • Study on hydrogen absorption mechanism into iron by laser speckle microscopy under electrochemical perturbation

    Grant number：26289268  2014.4 - 2017.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    TADA EIJI

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    Grant amount：\16510000 （ Direct Cost: \12700000 、 Indirect Cost：\3810000 ）

    In this study, hydrogen absorption into iron was investigated by the measurements of hydrogen permeation current responses induced by stimulating hydrogen evolution reaction with potential modulation. Hydrogen absorption efficiency of iron was evaluated as a function of electrode potential by using both DC and AC components of the current responses. The hydrogen absorption efficiency of iron increased with decreasing cathodic polarization. The results suggested that hydrogen absorption kinetics can be considered to be faster than diffusion of hydrogen atoms in iron and to be under a quasi-equilibrium condition.
    Measurements of laser speckle patterns of iron surface with hydrogen permeation current was successfully done. The laser speckle patterns changed with the response of hydrogen permeation current, suggesting that surface distribution of hydrogen permeation current can be detected.

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  • Study on cut-edge corrosion mechanism of galvanized corrosion and improvement of corrosion resistance by utilizing multiphysics analysis

    Grant number：23560861  2011 - 2013

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    TADA EIJI

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    Grant amount：\5460000 （ Direct Cost: \4200000 、 Indirect Cost：\1260000 ）

    This study focused on cut-edge corrosion mechanism of galvanized steels. In order to investigate anodic and cathodic reactions on steels with Zn corrosion products formed in 1 M NaCl and 1 M MgCl2, electrochemical microcell technique was employed. The morphology and compositions of Zn corrosion products formed on the steels depended on solution compositions and the distance from zinc coating layer. In addition, cathodic reaction was suppressed to some extent by deposition of the corrosion products. On the other hand, anodic reaction was suppressed on steel significantly by precipitation of the corrosion products containing Mg.

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  • The next-generation lead acid battery using a composite of nano-particles from hydrolysis and a conductive polymer

    Grant number：21560768  2009 - 2011

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    TAGUCHI Masami, TADA Eiji

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    Grant amount：\4680000 （ Direct Cost: \3600000 、 Indirect Cost：\1080000 ）

    A series of PbO_2 nanoparticles prepared by hydrolysis of lead acetate in various mixtures of water and alcohol were characterized, and the properties of the novel lead acid battery using the nanoparticles as the active materials for positive electrode were examined by discharge-charge cycling. All the nanoparticles, which were identified as β-PbO_2 single phase, ranged from about 9 to 13 nm in diameter. In comparison with the PbO_2 powder prepared by the conventional method in lead acid battery industry, namely the electrolytic oxidation of lead powder, the PbO_2 nanoparticles had remarkably high performance in both utilization of the active materials for positive electrode and the current efficiency during discharge-charge cycling

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  • Investigation of corrosion degradation under stressing Using Double Sample Split Cell method

    Grant number：20560666  2008 - 2010

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    TADA Eiji

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    Grant amount：\4810000 （ Direct Cost: \3700000 、 Indirect Cost：\1110000 ）

    In this study, the double-sample split-cell method was developed to investigate corrosion degradation under deformation. This method was applied to study the effect of applied stress on the initiation of localized corrosion of sensitized stainless steels. The results indicated that initiation of localized corrosion was enhanced by applying tensile stress or pre-strain. Furthermore, it was found that the morphology transition from a pit to cracks was observed when plastic strain was applied during growth of localized corrosion.

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  • ELASTO-PLASTIC-CREEP CHARACTERISTICS OF ELECTROPLATED COPPER FOIL AND ITS ESTIMATION BY STEPPED MICRO INDENTATION

    Grant number：19560071  2007 - 2008

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    OHGUCHI Ken-ichi, EIJI Eiji

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    Grant amount：\4550000 （ Direct Cost: \3500000 、 Indirect Cost：\1050000 ）

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  • Study on growth mechanism of thin films during electrodepostion at two-liquid interface by measuring interfacial tension

    Grant number：18360347  2006 - 2007

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    KANEKO Hiroyuki, TADA Eiji

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    Grant amount：\7720000 （ Direct Cost: \7300000 、 Indirect Cost：\420000 ）

    So far the head investor of this study and coworkers observed two dimensional growth of a thin film at the interface between two immiscible liquids. They applied the interface to prepare thin films electrochemically. However, it has not yet clarified why the films grow preferentially in the interfacial direction. We tried to elucidate growth mechanism of the films at the interface between two immiscible liquids. In this study we focused on the change in interfacial tension during electrodeposition of thin films. First, we applied Whilhelmy method to measure the interfacial tension during electrodeposition of zinc films at the interface between n-butyl acetate and ZnSO_4. As a result, we confirmed that the interfacial tension decreased around the growth front of the film, suggesting that this decrease can induce Marangoni convection along the interface, which can generate rapid transportation of Zn^<2+> to a growth front of the film. In order to confirm evolution of Marangoni convection at the interface during electrodeposition, we applied Schlieren method and Mach-Zehnder interferometry to observe the motion of liquids around the interface during the electrodeposition of a thin film. As a result, we visualized vortex of the electrolyte in the vicinity of growth front of the film. We believe that this vortex is caused by Marangoni convection. Finally, we tried to apply ripplon light scattering technique to measure interfacial tension between two immiscible liquids. We made a system for the measurement, and succeeded in measure surface tensions of water and ethyl alcohol. However, we could not get strong intensity of ripplon enough to estimate interfacial tension between the liquids. Therefore, we need to improve the system to get good signals by ripplon.

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  • 水素イオン感応性シリカキセロゲル膜の作製と水素イオン分布顕微鏡の開発

    Grant number：17760576  2005 - 2006

    日本学術振興会  科学研究費助成事業  若手研究(B)

    多田 英司

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    Grant amount：\3500000 （ Direct Cost: \3500000 ）

    本年度は,テトラエチルオルトシリケートの加水分解・重合反応によって作製したシリカキセロゲル膜の構造および膜特性を原子間力顕微鏡(AFM)および接触角測定により判断し,得られたデータから判断した最適製膜条件をもとに,Si製カンチレバー上にシリカキセロゲル膜をディップコーティング法により塗布した.しかし,SEM等による観察の結果,カンチレバー上に塗布したシリカキセロゲル膜が不均一であり,また一部分にはくりが生じた.よって,昨年度の研究においてガラス基板上へ塗布したゾル組成,コーティング条件ではシリカキセロゲル膜を適切に塗布することができないことがわかった.そこで,Si製カンチレバーからSi_3N_4製カンチレバーに変更して,溶液環境のpH変化に対して原子間力顕微鏡によって測定されるフォースカーブがどのように変化するか調査した.そのため,金板を中性水溶液中でカソード分極することによって,金表面で酸素の還元反応を生じさせ,表面のpHを変化させた.フォースカーブの測定から溶液内のpHの変化に応じて,フォースカーブ形状が変化し,カンチレバーにかかる引力が変化することが明らかになった.このことから,試料表面のpH変化をフォースカーブ測定より検出し,pH分布をマッピングすることが今後期待された.
    今後は,機水特性が良いシリカキセロゲルにSi_3N_4を添加した薄膜をカンチレバー上に塗布できるように製膜条件を探索し,水素イオン分布測定に適用したいと考えている.

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  • CTスキャン型イオン分布イメージング装置の開発

    Grant number：16760582  2004

    日本学術振興会  科学研究費助成事業  若手研究(B)

    多田 英司

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    Grant amount：\2700000 （ Direct Cost: \2700000 ）

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  • 二液相界面電析法による金属超薄膜の製造とその成長機構の解明

    Grant number：15656180  2003 - 2004

    日本学術振興会  科学研究費助成事業  萌芽研究

    金児 紘征, 多田 英司

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    Grant amount：\2900000 （ Direct Cost: \2900000 ）

    金属塩水溶液と有機液体からなる二液相界面で電析を行なうと,析出物が界面に沿って薄膜状に優先成長する成長形態が観察される.この特異な成長形態は,界面近傍での濃度減少が引き起こしている物質輸送をともなう溶液流が影響していると考えられる.そこで,本年度は,前年度に試みた溶液流の光学的可視化技術の確立を目指した.すなわち,前年度に行なったシャドウグラフ法に加えて,シェリーレン法およびマッハツェンダー干渉計による光学的可視化ができるようにした.その結果,シャドウグラフ法のみでは不充分であった界面近傍の濃度変化,密度変化をより明確に観察できた.
    つぎに,この技術を応用して,実際に薄膜成長時の溶液流を側面部,上部より観察し,溶液流の3次元挙動を明らかにすることで,薄膜成長との関連性を検討した.実験は,酢酸ブチル/硫酸亜鉛水溶液界面において亜鉛薄膜を一方向成長させ,その成長過程を調べた.シェリーレン法では,側面から観察すると,白金線直下に引き込むような大きな流れが見られ,薄膜が成長すると成長先端部でうず流が確認できた.上部から観察すると,電析開始と同時に成長方向へ押し出すような溶液流が顕著に見られた.薄膜成長にともない,溶液流の発生位置も移動し,薄膜先端部で溶液を押し出す動きと引き戻す動きが見られ.溶液を薄膜先端部に供給するような流れが確認できた.また,薄膜先端部の形態に対応した溶液流の変化も見られた.マッハツェンダー干渉計では,界面近傍の密度勾配を観察でき,これが溶液の対流の原因であることがわかった.これらのことから,薄膜の成長形態と溶液流れに密接な関連性があることが明らかになった.

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  • Preparations and specific properties of electroconductive films by electrodeposition at the interface between two liquid phases

    Grant number：14350379  2002 - 2004

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    KANEKO Hiroyuki, TAGUCHI Mashami, TADA Eiji

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    Grant amount：\14800000 （ Direct Cost: \14800000 ）

    Under specialized experimental conditions, thin electoroconductive films can be obtained by electodeposition at the two-liquid-phase interface. The purpose of this study is to establish the preparing method of electroconductive films by the electrolysis at the interface and to analyze the specific properties of the films.
    In 2002, we found that the interface vibrated when the film grew at the interface and this phenomenon resulted in the generation of growth ripples in the film. A copper film with a flat surface was obtained when an applied voltage was as low as possible.
    In 2003, we surveyed the experimental conditions for preparing one-directionally polypyrrole film along the interface and succeeded in preparing the film. Electric conductivity of the film was not homogeneous : Its conductivity in the growth direction is higher than that in the vertical direction. In addition, the relation between interfacial tension and interfacial growth was investigated : Interfacial tension decreased with the growth, showing that the concentration of the solute component decreases near the growth front.
    In 2004, the experimental conditions for preparing the film of cobalt were surveyed. The morphology of the cobalt film obtained looked like a peacock's feather. Electrodeposition of zinc was tried when an aqueous solution and an organic liquid heavier than aqueous solution were used as two liquid phases. In this case, an electrodeposit grew at the interface but filmy growth was favored when an aqueous solution and an organic liquid lighter than aqueous solution were used.
    From these results, we could establish the method for preparing conductive films and investigate specific properties of the films.

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  • Electrochemical conditions for Separating purified metallic films by electrodeposition at the two-liquid-phase interface.

    Grant number：11450268  1999 - 2001

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    KANEKO Hiroyuki, TADA Eiji, TAGUCHI Masami

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    Grant amount：\14800000 （ Direct Cost: \14800000 ）

    A two-dimensional metal deposit can be obtained by the cathodic reduction of the metal at the interface between an organic liquid and an aqueous solution. One advantage of this technique is that any solid substrate is not needed. Therefore, as one of attractive application of this technique, electrochemical conditions were surveyed for preparing purified metallic films in this study.
    Firstly, experimental techniques were developed to maintain uniform growth of metallic films along the interface, ; The given distance between the counter electrode and the growth front of the metal was held, by moving the counter electrode.
    Secondly, effects of impurities in aqueous solutions were examined on the growth and purity of zinc electrodeposited. The additions of Cu and Fe ions influenced scarcely on the growth of zinc,but the addition of Pb ions resulted in an uniform growth of zinc. Pb and Cu enriched in zinc, but Fe did not enrich.
    Fundamental information to obtain purified metallic films by this technique was obtained.Above results will be very useful for preparing highly purified metallic films.

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  • Corrosion degradation of PEFC bipolar plates

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    Grant type：Competitive

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  • 燃料電池材料の腐食劣化評価

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    Grant type：Competitive

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  • Corrosion-deformation interaction

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    Grant type：Competitive

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  • 表面処理鋼板の腐食防食機構解明

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    Grant type：Competitive

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  • 金属材料の環境強度評価

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    Grant type：Competitive

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  • Corrosion of galvanized steel

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    Grant type：Competitive

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