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Modification of NiCoCrAlY with Pt: Part Ⅱ. Application in TBC with pure metastable tetragonal(t’) phase YSZ and thermal cycling behavior
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作者 Chuntang Yu He Liu +3 位作者 Chengyang Jiang Zebin Bao Shenglong Zhu Fuhui Wang 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2019年第3期350-359,共10页
A thermal barrier coating system comprising Pt-modified NiCoCrAlY bond coating and nanostructured 4mol.% yttria stabilized zirconia(4YSZ, hereafter) top coat was fabricated on a second generation Ni-base superalloy. T... A thermal barrier coating system comprising Pt-modified NiCoCrAlY bond coating and nanostructured 4mol.% yttria stabilized zirconia(4YSZ, hereafter) top coat was fabricated on a second generation Ni-base superalloy. Thermal cycling behavior of NiCoCrAlY-4 YSZ thermal barrier coatings(TBCs) with and without Pt modification was evaluated in ambient air at 1100?C up to 1000 cycles, aiming to investigate the effect of Pt on formation of thermally grown oxide(TGO) and oxidation resistance. Results indicated that a dual layered TGO, which consisted of top(Ni,Co)(Cr,Al)2O4 spinel and underlying α-Al2O3, was formed at the NiCoCrAlY/4 YSZ interface with thickness of 8.4μm, accompanying with visible cracks at the interface. In contrast, a single-layer and adherent α-Al2O3 scale with thickness of 5.6μm was formed at the interface of Pt-modified NiCoCrAlY and 4 YSZ top coating. The modification of Pt on NiCoCrAlY favored the exclusive formation of α-Al2O3 and the reduction of TGO growth rate, and thus could effectively improve overall oxidation performance and extend service life of TBCs. Oxidation and degradation mechanisms of the TBCs with/without Pt-modification were discussed. 展开更多
关键词 Pt-modification NICOCRALY THERMAL barrier coating(TBC) THERMAL cycling Thermally grown oxide(TGO)
Modeling the corrosion behavior of Ni-Cr-Mo-V high strength steel in the simulated deep sea environments using design of experiment and artificial neural network
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作者 Qiangfei Hu Yuchen Liu +2 位作者 Tao Zhang Shujiang Geng Fuhui Wang 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2019年第1期168-175,共8页
Corrosion in complex coupling environments is an important issue in corrosion field, because it is difficult to take into account a large number of environment factors and their interactions. Design of Experiment(DOE)... Corrosion in complex coupling environments is an important issue in corrosion field, because it is difficult to take into account a large number of environment factors and their interactions. Design of Experiment(DOE) can present a methodology to deal with this difficulty, although DOE is not commonly spread in corrosion field. Thus, modeling corrosion of Ni-Cr-Mo-V steel in deep sea environment was performed in order to provide example demonstrating the advantage of DOE. In addition, an artificial neural network mapping using back-propagation method was developed for Ni-Cr-Mo-V steel such that the ANN model can be used to predict polarization curves under different complex sea environments without experimentation. Furthermore, roles of environment factors on corrosion of Ni-Cr-Mo-V steel in deep sea environment were discussed. 展开更多
关键词 Ni-Cr-Mo-V steel Deep sea corrosion Design of experiment Artificial neural network
Modification of NiCoCrAlY with Pt: Part Ⅰ. Effect of Pt depositing location and cyclic oxidation performance
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作者 Yingfei Yang Hongrui Yao +2 位作者 Zebin Bao Pan Ren Wei Li 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2019年第3期341-349,共9页
Pt layers of 5 μm in thickness were electroplated before or after depositing NiCoCrAlY coating by arc ion plating(AIP) aiming for identifying the effect of Pt enriching position on microstructure and cyclic oxidation... Pt layers of 5 μm in thickness were electroplated before or after depositing NiCoCrAlY coating by arc ion plating(AIP) aiming for identifying the effect of Pt enriching position on microstructure and cyclic oxidation behavior of Pt modified NiCoCrAlY coatings. Al-rich zones formed at the same position of Ptrich zones for both modified coatings due to uphill diffusion of Al driven by Pt. Cyclic oxidation tests at 1000 and 1100?C indicated that oxidation resistance of NiCoCrAlY was improved by Pt modification via different mechanisms: at surface, Pt-rich zone promoted selective oxidation of Al to form α-Al2O3,whilst at coating/substrate interface Pt-rich zone acted as effective diffusion barrier for titanium. Roles of Pt played in enhancing the oxidation performance of various Pt-modified NiCoCrAlY coating were investigated. 展开更多
关键词 CYCLIC oxidation Pt-modification NICOCRALY Electron PROBE micro-analysis(EPMA)
Microbiologically influenced corrosion of titanium caused by aerobic marine bacterium Pseudomonas aeruginosa
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作者 M.Saleem Khan Zhong Li +6 位作者 Ke Yang Dake Xu Chunguang Yang Dan Liu Yassir Lekbach Enze Zhou Phuri Kalnaowakul 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2019年第1期216-222,共7页
Microbiologically influenced corrosion(MIC) is a big threat to the strength and safety of many metallic materials used in different environments throughout the world. The metabolites and bioactivity of the microorgani... Microbiologically influenced corrosion(MIC) is a big threat to the strength and safety of many metallic materials used in different environments throughout the world. The metabolites and bioactivity of the microorganisms cause severe deterioration on the metals. In this study, MIC of pure titanium(Ti) was studied in the presence of a highly corrosive aerobic marine bacterium Pseudomonas aeruginosa. The results obtained from electrochemical test showed that Ti was corrosion resistant in the abiotic culture medium after 14 d, while the increased corrosion current density(icorr) obtained from polarization curves and the decreased charge transfer resistance(Rct) from electrochemical impedance spectroscopy(EIS)indicated the accelerated corrosion of Ti caused by P. aeruginosa biofilm. For further confirmation of the above results, the surface of Ti was investigated using scanning electron microscopy(SEM), confocal laser scanning microscopy(CLSM) and X-ray photoelectron spectroscopy(XPS). According to the XPS results, TiO2 was formed in both abiotic and biotic conditions, while unstable oxide Ti2O3 was detected in the presence of P. aeruginosa, leading to the defects in the passive film and localized corrosion. Pitting corrosion was investigated with the help of CLSM, and the largest pit depth found on Ti surface immersed in P. aeruginosa was 1.2 μm. Ti was not immune to MIC caused by P. aeruginosa. 展开更多
关键词 Ti Microbiologically influenced CORROSION PSEUDOMONAS AERUGINOSA
Anaerobic microbiologically influenced corrosion mechanisms interpreted using bioenergetics and bioelectrochemistry: A review
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作者 Yingchao Li Dake Xu +6 位作者 Changfeng Chen Xiaogang Li Ru Jia Dawei Zhang Wolfgang Sand Fuhui Wang Tingyue Cu 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2018年第10期1713-1718,共6页
微生物学地影响的腐蚀(MIC ) 是腐蚀损坏,设备失败,和金融损失的一个主要原因,使 MIC 成为一个重要研究话题。由于复杂 microbiological 活动和在 biofilms 和金属表面之间的相互作用的深理解的缺乏, MIC 出现和机制是困难的预言并... 微生物学地影响的腐蚀(MIC ) 是腐蚀损坏,设备失败,和金融损失的一个主要原因,使 MIC 成为一个重要研究话题。由于复杂 microbiological 活动和在 biofilms 和金属表面之间的相互作用的深理解的缺乏, MIC 出现和机制是困难的预言并且解释。许多理论和机制被建议了解释 MIC。在这评论, MIC 的机制用 bioenergetics,微生物引起的呼吸类型,和 biofilm 被讨论细胞外的电子转移(EET ) 。二种主要 MIC 类型,也就是 EET-MIC 和代谢物 MIC (M-MIC ) ,被讨论。这简短评论提供现状卓见进 MIC 机制,它在油和煤气的工业在厌氧的条件下面帮助 MIC 的出现的诊断和预言。 展开更多
关键词 腐蚀机制 微生物学 评论 地影 厌氧 MIC 呼吸类型 腐蚀损坏
ZnO Branched Nanowires Photoanode for Water Splitting: Effect of Nitrogen Doping by DC Glow Discharge Plasma 预览
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作者 Shrok Allami Ying Li +1 位作者 Li Liu Tianshu Li 《物理科学与应用:英文版》 2016年第1期221-228,共8页
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Influence of Nitrogen Flow Ratio on the Microstructure, Composition, and Mechanical Properties of DC Magnetron Sputtered Zr-B-O-N Films
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作者 Tie-Gang Wang Yanmei Liu +2 位作者 Tengfei Zhang Doo-In Kim KwanKHo Kim 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2012年第11期981-991,共11页
Nanocrystalline ZrB 2 film and nanocomposite Zr-B-O-N films were prepared by non-reactive as well as reactive magnetron sputtering techniques, respectively. By means of X-ray diffraction analysis, electron probe micro... Nanocrystalline ZrB 2 film and nanocomposite Zr-B-O-N films were prepared by non-reactive as well as reactive magnetron sputtering techniques, respectively. By means of X-ray diffraction analysis, electron probe microanalysis, X-ray photoelectron spectroscopy, and scanning electron microscopy, the influence of nitrogen flow ratio on the film microstructure and characteristics were investigated systematically, including the deposition rate, chemical compositions, phase constituents, grain size, chemical bonding, as well as cross-sectional morphologies. Meanwhile, the hardness and adhesion of above films were also evaluated by micro-indentation method and a scratch tester. With increasing the nitrogen flow ratio, the deposition rate of above films decreased approximately linearly, whereas the contents of N and O in the films increased gradually and tended to saturation. Moreover, the film microstructure was also altered gradually from a fine columnar microstructure to a featureless glass-structure. As the nitrogen flow ratio was 11.7%, the Zr-B-O-N film possessed an typical nanocomposite structure and presented good mechanical properties. During the process of reactive sputtering of metal borides, the introduction of nitrogen can show a pronounced suppression of columnar grain growth and strong nanocomposite structure forming ability. 展开更多
关键词 微观结构特征 流量比 直流磁控溅射 相组成 氮气 力学性能 X-射线衍射分析 纳米复合材料
Effect of Acetic Acid on Localized Corrosion of Carbon Steel in Inhibited 3% NaCl Solution under CO2 Environment 预览
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作者 Hiroshi Honda Yasuyoshi Tomoe 《材料科学与工程:中英文版》 2010年第10期 34-39,共6页
关键词 3%NaCl溶液 局部腐蚀 碳钢 乙酸 CO2 环境 作者 电化学阻抗谱
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The corrosive behaviors of GI and IF steel sheets in salt water drops 预览
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作者 ZHANG Hong QI Huibiil LI Xiaoggang 《宝钢技术研究:英文版》 CAS 2009年第2期 7-12,共6页
The corrosive behaviors of hot-dip galvanized steel (GI) sheets and the corresponding interstitial free (IF) steel base sheets for use in automobiles were investigated by the classical salt water drop (SWD) test at ro... The corrosive behaviors of hot-dip galvanized steel (GI) sheets and the corresponding interstitial free (IF) steel base sheets for use in automobiles were investigated by the classical salt water drop (SWD) test at room temperature.The corrosive processes and products were observed and analyzed through morphological observation,a scanning electronic microscope (SEM) and an energy dispersive spectrum (EDS).The results show that the anodic and cathode sites can be distinguished clearly during and after the test.The propagation of rusting,and the color,distribution and composition of the final corrosive products of the two kinds of materials are quite different.The SWD corrosive mechanisms of steel with and without galvanized coating are both discussed in this paper. 展开更多
关键词 IF钢板 地理标志 腐蚀行为 水滴 扫描电子显微镜 热浸镀锌钢板 形态学观察
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