X射线光电子能谱(X-ray photoelectron spectroscopy,XPS)技术也被称作用于化学分析的电子能谱(electron spectroscopy for chemical analysis,ESCA).XPS属表面分析法,它可以给出固体样品表面所含的元素种类、化学组成以及有关的电子结...X射线光电子能谱(X-ray photoelectron spectroscopy,XPS)技术也被称作用于化学分析的电子能谱(electron spectroscopy for chemical analysis,ESCA).XPS属表面分析法,它可以给出固体样品表面所含的元素种类、化学组成以及有关的电子结构重要信息,在各种固体材料的基础研究和实际应用中起着重要的作用.文章简要介绍了XPS仪器的工作原理和分析方法,并给出了XPS在科学研究工作中的应用实例.展开更多
近年来,基于扫描电镜的矿物自动分析仪如QEMSCAN(Quantitative Evaluation of Minerals by Scanning Electronic Microscopy)、MLA(Mineral Liberation Analyser)和AMICS(Advanced Mineral Identification and Characterization System...近年来,基于扫描电镜的矿物自动分析仪如QEMSCAN(Quantitative Evaluation of Minerals by Scanning Electronic Microscopy)、MLA(Mineral Liberation Analyser)和AMICS(Advanced Mineral Identification and Characterization System)已经广泛应用于矿物的自动识别与测量;激光剥蚀等离子质谱仪(LA-ICP-MS)由于其在痕量上的检测优势,使元素赋存状态的研究更加准确与深入;飞行时间二次离子质谱仪(TOF-SIMS)的应用为研究矿物表面特性及其变化提供了便利和可靠的方法。部分大型矿山企业在地质勘查阶段就对不同区段的样品进行工艺矿物学研究,关注矿石性质的空间变化给选矿工艺及指标带来的影响,为及时优化改进工艺流程提供依据和指导。就目前研究成果而言,矿物自动测量与分析技术的不断完善,建立数学模型预测选矿指标以及矿物三维数据表征技术在工艺矿物学研究中的应用是其持续发展的新趋势和方向。展开更多
The corrosion behavior of typical high-strength aluminum alloy LY12 was studied by accelerated corrosion tests of cyclic wet-dry-immersion containing media of NaHSO3 and NaCl to simulate the corrosion process in diffe...The corrosion behavior of typical high-strength aluminum alloy LY12 was studied by accelerated corrosion tests of cyclic wet-dry-immersion containing media of NaHSO3 and NaCl to simulate the corrosion process in different atmosphere environment, and the corrosion mechanism was also discussed. The main experimental techniques include mass loss, morphological check, analysis of corrosion products and electrochemical measurement. The result shows that the mass loss of LY12, with or without cladding, has linear relationship with test time in the three kinds of chemical media, 0.02 mol/L NaHSO3, 0.006 mol/L NaCl and 0.02 mol/L NaHSO3+0.006 mol/L NaCl, respectively. A layer of cladding on high-strength aluminum alloy can raise evidently the resistance of atmospheric corrosion. Cl- can promote pitting generation on the oxide film of LY12 when HOS 3-exists, LY12 can react much intensely with HOS3- derived from anions.展开更多
文摘X射线光电子能谱(X-ray photoelectron spectroscopy,XPS)技术也被称作用于化学分析的电子能谱(electron spectroscopy for chemical analysis,ESCA).XPS属表面分析法,它可以给出固体样品表面所含的元素种类、化学组成以及有关的电子结构重要信息,在各种固体材料的基础研究和实际应用中起着重要的作用.文章简要介绍了XPS仪器的工作原理和分析方法,并给出了XPS在科学研究工作中的应用实例.
文摘近年来,基于扫描电镜的矿物自动分析仪如QEMSCAN(Quantitative Evaluation of Minerals by Scanning Electronic Microscopy)、MLA(Mineral Liberation Analyser)和AMICS(Advanced Mineral Identification and Characterization System)已经广泛应用于矿物的自动识别与测量;激光剥蚀等离子质谱仪(LA-ICP-MS)由于其在痕量上的检测优势,使元素赋存状态的研究更加准确与深入;飞行时间二次离子质谱仪(TOF-SIMS)的应用为研究矿物表面特性及其变化提供了便利和可靠的方法。部分大型矿山企业在地质勘查阶段就对不同区段的样品进行工艺矿物学研究,关注矿石性质的空间变化给选矿工艺及指标带来的影响,为及时优化改进工艺流程提供依据和指导。就目前研究成果而言,矿物自动测量与分析技术的不断完善,建立数学模型预测选矿指标以及矿物三维数据表征技术在工艺矿物学研究中的应用是其持续发展的新趋势和方向。
基金Project(50499331) supported by the National Natural Science Foundation of China
文摘The corrosion behavior of typical high-strength aluminum alloy LY12 was studied by accelerated corrosion tests of cyclic wet-dry-immersion containing media of NaHSO3 and NaCl to simulate the corrosion process in different atmosphere environment, and the corrosion mechanism was also discussed. The main experimental techniques include mass loss, morphological check, analysis of corrosion products and electrochemical measurement. The result shows that the mass loss of LY12, with or without cladding, has linear relationship with test time in the three kinds of chemical media, 0.02 mol/L NaHSO3, 0.006 mol/L NaCl and 0.02 mol/L NaHSO3+0.006 mol/L NaCl, respectively. A layer of cladding on high-strength aluminum alloy can raise evidently the resistance of atmospheric corrosion. Cl- can promote pitting generation on the oxide film of LY12 when HOS 3-exists, LY12 can react much intensely with HOS3- derived from anions.