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Surface characteristics of chemical conversion coating for Mg-Al alloy

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中国有色金属学会会刊：英文版 2009年第4期19卷 892-897页

作者： Masazumi OKIDO ryoichi ichino Seong-Jong KIM Seok-Ki JANG Nagoya University Division of Marine Engineering Mokpo Maritime University

The chemical conversion coating was formed on Mg alloy for low cost and harmlessness in environment by using the colloidal silica as the main *** film formed at 298 K was thick,which was thought to be the combination of Si and *** salt spray test,the ratio of black rust on the specimen that did not conducted chemical conversion treatment was five times or more than those of the chemical conversion treated *** film of chemical conversion coating produced by alkali treatment process was thinner than the specimen produced in basic chemical conversion treatment solution.

关键词：化学转化膜镁铝合金表面特性环境无害化盐雾试验涂膜厚度低成本硅溶胶

Electrochemical characteristics and surface morphology in non-chromate chemical conversion coating for Zn-electroplated steel sheets

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中国有色金属学会会刊：英文版 2009年第B09期19卷 45-49页

作者： Masazumi OKIDO ryoichi ichino Seok-Ki JANG Seong-Jong KIM Graduate School of Engineering Nagoya University Division of Marine Engineering Mokpo Maritime University

The corrosion protection property and morphology of colloidal silica conversion films as an alternative to chemical conversion coating(CCC) films were examined. The corrosion behavior was investigated in 3% NaCl solution using electrochemical techniques. Corrosion was implied by the appearance of red rust on the specimen surface. The results show that in 3% NaCl solution, red rust appears at 15-20, 55-70, and 75-85 d on Zn-electroplated steel, colloidal silica conversion-coated specimens, and chemical conversion-coated, specimens, respectively. In the salt spray test, the colloidal silica film provides better corrosion protection than CCC film, i.e., red rust appears at 96 h on the Zn-electroplated steel sheet, at 432 h on the CCC films, and at 888 h on silica conversion coating.

关键词：化学转化膜电镀钢板表面形貌电化学特性 3%NaCl溶液胶体二氧化硅二氧化硅薄膜 CCC认证

Effect of Additives on Bi electrodeposition

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Effect of Additives on Bi electrodeposition

Osteoconductivity of Superhydrophilic Anodized TiO<sub>2</sub>Coatings on Ti Treated with Hydrothermal Processes

2006年上海电子电镀学术报告会

作者： Hitoshi Wada ryoichi ichino Masazumi Okido Department of Materials Science and Engineering Graduate School of Engineering Nagoya University Furo-cho Chikusa-ku Nagoya 464-8603 Japan Department of Materials Science and Engineering Graduate School of Engineering Nagoya University Furo-cho Chikusa-ku Nagoya 464-8603 Japan Department of Materials Science and Engineering Graduate School of Engineering Nagoya University Furo-cho Chikusa-ku Nagoya 464-8603 Japan

＜正＞Lead has been uscd in many industrial ficlds by its good characteristics such as malleability, corrosion resistance and the low melting point. However, the use of lead is strongly limited because it is harmful to the living bodies and the environment. Bismuth has a low melting point near that of lead and the other characteristics is also similar to these of lead. Bismuth is, however, little influence on the human body and the environment. In this paper, we have

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Journal of Biomaterials and Nanobiotechnology 2013年第1期4卷 45-52页

作者： Dai Yamamoto Kazushi Arii Kensuke Kuroda ryoichi ichino Masazumi Okido Azusa Seki Department of Materials Science & Engineering Graduate School of Engineering Nagoya University Nagoya Japan EcoTopia Science Institute Nagoya University Nagoya Japan Hamri Co. Ltd. Tokyo Japan

Surface hydrophilicity is considered to have a strong influence on the biological reactions of bone-substituting materials. However, the influence of a hydrophilic surface on osteoconductivity is not completely clear, especially for superhydrophilic surfaces. In this study, we conferred superhydrophilic properties on anodized TiO2 coatings using a hydrothermal treatment, and developed a method to maintain this surface until implantation. The osteoconductivity of these coatings was evaluated with in vivo tests. A hydrothermal treatment made the surface of as-anodized samples more hydrophilic, up to a water contact angle of 13 (deg.). Storage in both air and distilled water increased the water contact angle after several days because of the adsorption of hydrocarbon. However, storage in phosphate buffered solution led to a reduction in the water contact angle, because of the adsorption of the inorganic ions in the solution, and the sample retained its high hydrophilicity for a long time. As the water contact angle decreased, the hard tissue formation ratio increased continuously up to 58%, which was about four times higher than the hard tissue formation ratio on as-polished Ti.

关键词： Titanium Anodizing Superhydrophilic Hydrothermal Treatment Phosphate Buffered Saline Osteoconductivity

Preparation of Cu nanoparticles with NaBH_4 by aqueous reduction method

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Transactions of Nonferrous Metals Society of China 2012年第1期22卷 117-123页

作者： LIU Qing-ming ZHOU De-bi Yuya YAMAMOTO ryoichi ichino Masazumi OKIDO School of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China Department of Materials Science Graduate School of EngineeringNagoya UniversityNagoya 4648603Japan

Cu nanoparticles were prepared by reducing Cu2＋ ions with NaBH4 in alkaline solution. The effects of NaBH4 concentration and dripping rate on the formation of Cu nanoparticles were studied. The optimum conditions are found to be 0.2 mol/L Cu2＋, solution with pH=12, temperature of 313 K and 1% gelatin as dispersant, to which 0.4 mol/L NaBH4 is added at a dripping rate of 50 mL/min. NH3-H2O is found to be the optimal complexant to form the Cu precursor. A series experiments were conducted to study the reaction process at different time points.

关键词： Cu nanoparticles aqueous reduction method precursor reaction process

Influence of Alloy Elements on the Osteoconductivity of Anodized Ti-29Nb-13Ta-4.6Zr Alloy

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Journal of Biomaterials and Nanobiotechnology 2013年第3期4卷 229-236页

作者： Dai Yamamoto Atsushi Waki Kensuke Kuroda ryoichi ichino Masazumi Okido Masato Ueda Masahiko Ikeda Mitsuo Niinomi Azusa Seki Department of Materials Science & Engineering Graduate School of Engineering Nagoya University Nagoya Japan EcoTopia Science Institute Nagoya University Nagoya Japan Faculty of Chemistry Materials and Bioengineering Kansai University Suita Japan Hamri Co. Ltd. Tokyo Japan Institute for Materials Research Tohoku University Sendai Japan

Anodizing is expected to be an effective method to improve the osteoconductivity of the Ti-29Nb-13Ta-4.6Zr (TNTZ) alloy because the bioactivity of anodized Ti is good. However, it is not known how the alloy elements influence the surface roughness, composition, hydrophilicity, and osteoconductivity of the anodized film on the Ti alloy. In this study, we investigated the effects of anodizing on the surface properties and the osteoconductivity of the anodized TNTZ alloy, focusing on the functions of the individual alloy elements. The anodized oxides of the Nb, Ta, and Zr metals were hydrophobic at all the voltages applied, in contrast to the anodized oxide of Ti. As well as pure Ti, a TiO2-based oxide film formed on TNTZ after anodizing. However, the oxide film also contained large amounts of Nb species and the molar Nb/Ti ratio in the TNTZ alloy was high, which makes the surface more hydrophobic than the anodized oxide on Ti. In vivo tests showed that the osteoconductivity of the TNTZ alloy was sensitive to both its surface roughness and hydrophilicity. When the TNTZ alloy was anodized, the process increased either the surface hydrophobicity or the surface roughness at the voltage used in this study. These changes in the surface properties did not improve its osteoconductivity.

关键词： Ti-29Nb-13Ta-4.6Zr Anodizing Titanium Dioxide Alloy Element Hydrophilicity Osteoconductivity

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电化学沉积生物陶瓷新方法

稀有金属与硬质合金 2002年第1期30卷 6-8页

作者：赵中伟李洪桂孙培梅李运姣霍广生兴户正纯市野良一中南大学冶金科学与工程系湖南长沙410083 名古屋大学工学部

在钛基板上电沉积了致密的、结合良好的磷酸钙生物陶瓷膜。在 5 5℃下使用含钙离子 0 0 1mol/dm3 ,磷酸根离子 0 0 0 6mol/dm3 ,NaCl浓度为 0 14 5mol/dm3 的溶液 ,考察了添加H2 O2 的影响。无论使用H2 O2 与否 ,所得的沉积物均为羟... 详细信息

在钛基板上电沉积了致密的、结合良好的磷酸钙生物陶瓷膜。在 5 5℃下使用含钙离子 0 0 1mol/dm3 ,磷酸根离子 0 0 0 6mol/dm3 ,NaCl浓度为 0 14 5mol/dm3 的溶液 ,考察了添加H2 O2 的影响。无论使用H2 O2 与否 ,所得的沉积物均为羟基磷灰石 (hydroxyapatite,HAp) ,但是在使用H2 O2 时 ,阴极电位约为 - 0 2V(vsSCE)即开始有阴极电流 ,而且没有氢气析出。与此形成对照的是在不使用H2 O2 时 ,需要极化到 - 1.4V(vsSCE)才有阴极电流 ,并且伴随着大量氢气析出。H2 O2

关键词：电化学沉积生物陶瓷羟基磷灰石包覆双氧水薄膜