非晶态Fe—W镀层铬酸盐钝化膜耐蚀机理探讨

Ｆｅ－Ｗ非晶镀层经铬酸盐钝化处理，可获得有装饰的含Ｃｒ钝化膜，经测定，孔蚀电位较钝化前正移１．６８Ｖ，明显改善了抗Ｃｌ＾－腐蚀的能力，ＡＥＳ与ＸＰＳ的分析结果表明，钝化膜由内外两层构成，外层为Ｆｅ（ＣｒＯ４）３．Ｃｒ２（ＣｒＯ４）３／Ｃｒ２（Ｃｒ２Ｏ７）３．Ｆｅ（ＯＨ）３／ＦｅＯＯＨ．ＷＯ３．ｎＨ２Ｏ等化合物，内层由Ｃｒ２Ｏ３，ＣｒＯ３，ＣｒＯＯＨ，ＦｅＯ，Ｆｅ２Ｏ３及ＷＯ３组成。钝化膜厚度约为６     

非晶态Fe－W镀层铬酸盐钝化膜耐蚀机理探讨

Ｆｅ－Ｗ非晶镀层经铬酸盐钝化处理，可获得具有装饰效果的含Ｃｒ钝化膜。经测定，孔蚀电位较钝化前正移１．６８Ｖ，明显改善了抗ＣＩ－腐蚀的能力。ＡＥＳ与ＸＰＳ的分析结果表明：钝化膜由内外两层构成，外层为Ｆｅ（ＣｒＯ４）３·Ｃｒ２（ＣｒＯ４）３／Ｃｒ２（Ｃｒ２Ｏ７）３·Ｆｅ（ＯＨ）３／ＦｅＯＯＨ·ＷＯ３·ｎＨ２Ｏ等化合物，内层由Ｃｒ２Ｏ３，ＣｒＯ３，ＣｒＯＯＨ，ＦｅＯ，Ｆｅ２Ｏ３及ＷＯ３组成。钝化膜厚度约为６０ｎｍ。该双层饨化膜有效地阻止了Ｃｌ－对基体金属的腐蚀。     

MICROSTRUCTURE AND DECOMPOSITION OF RS Al-Fe-Cr-Zr ALLOY

ＭＩＣＲＯＳＴＲＵＣＴＵＲＥＡＮＤＤＥＣＯＭＰＯＳＩＴＩＯＮＯＦＲＳＡｌ－Ｆｅ－Ｃｒ－ＺｒＡＬＬＯＹ￥ＸｉａｏＹｕｄｅ；ＬｉＳｈｏｎｇｒｕｉ；ＸｉｅＹｏｎｇａｎ；ＸｕＹｉｈｅｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅａｎｄＥｎｇｉ...     

电镀防护性锌基合金镀层钝化膜的耐蚀性

防护性锌基合金镀层钝化膜的耐蚀性比锌镀层钝化膜提高２－４倍。ＸＰＳ及ＡＥＳ分析表明,合金镀层钝化膜与锌镀层钝化膜均由ＣｒＯ３、Ｃｒ２Ｏ３、Ｚｎ（ＯＨ）２、ＺｎＯ及Ｈ２Ｏ等组成,并且ＣｒＯ３／Ｃｒ２Ｏ３的相对含量和Ｚｎ（ＯＨ）２／ＺｎＯ相对含量也基本相同,它们的区别在于,合金镀层钝化膜中总铬量较高,膜层完整、致密,镀层／钝化膜界面存在铁系金属的富集层,这是锌基合金镀层钝化膜具有高耐蚀性的主要原因。     

304不锈钢氧离子溅射的同步辐射光电子能谱原位研究：Ⅰ …

利用同步辐射光电子能谱（ＳＲ－ＸＰＳ）原位研究了经３ｋｅＶＯ２＾＋溅射的ＳＵＳ３０４不锈钢中Ｆｅ、Ｎｉ、Ｃｒ合金元素与氧离子的化学反应活性差异及三种金属元素间的相互作用规律,经低能氧离子溅射后,不锈钢表面形成了一薄层氧化物膜,元素Ｃｒ和Ｎ分别以Ｃｒ２Ｏ３和ＮｉＯ形式存在;铁元素的氧化产物随氧离子溅射量的增加分别以ＦｅＯ、ＦｅＯ和Ｆｅ２Ｏ３共存、全部生成Ｆｅ２Ｏ３的形式存在,在ＳＵＳ３０４不锈钢钢中     

NON-POLLUTION PROCESS FOR COMPLEX REFRACTORY SILVER-GOLD ORES

ＮＯＮ－ＰＯＬＬＵＴＩＯＮＰＲＯＣＥＳＳＦＯＲＣＯＭＰＬＥＸＲＥＦＲＡＣＴＯＲＹＳＩＬＶＥＲ－ＧＯＬＤＯＲＥＳＸｕＳｈｅｎｇｍｉｎｇ；ＺｈａｎｇＣｈｕａｎｆｕ；ＬｉＺｕｏｇａｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＮｏｎｆｅｒｒｏｕｓＭｅｔａｌｌｕｒｇｙ，Ｃｅ...     

20碳钢在三元复合驱溶液中的腐蚀行为

采用电化学测试技术与ＸＰＳ技术,研究了２０碳钢在三元复合驱溶液中的的电化学行为及钝化膜的组成与结构,结果表明,２０碳钢在三元复合驱溶液中发生钝化,形成的钝化膜组成为：Ｆｅ３Ｏ４,ＦｅＯＯＨ,Ｆｅ２Ｏ３和Ｆｅ（ＯＨ）２,其厚度约为７ｎｍ铁元素价态沿钝化膜深度变化,由表面＋３价到近基体表面＋３价与＋２价并存。     

ELECTROLYTIC SEPARATION FOR Ce－CARBIDE AND Fe－Ce－CARBIDE IN STEEL

ＥＬＥＣＴＲＯＬＹＴＩＣＳＥＰＡＲＡＴＩＯＮＦＯＲＣｅ－ＣＡＲＢＩＤＥＡＮＤＦｅ－Ｃｅ－ＣＡＲＢＩＤＥＩＮＳＴＥＥＬＸｉａｏ；ＱｉａｎｇＨａｎ；Ｑｉｙｏｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＰｈｙｓｉｃａｌＣｈｅｍｉｓｔｒｙ，ＵｎｉｖｅｒｓｉｔｙｏｆＳｃｉｅ...     

304不锈钢氧离子溅射的同步辐射光电子能谱原位研究Ⅰ.钢中金属元素的氧化行为

利用同步辐射光电子能谱（ＳＲ－ＸＰＳ）原位研究了经 ３ ｋｅＶ Ｏ２＋溅射的 ＳＵＳ ３０４不锈钢中 Ｆｅ、Ｎｉ、Ｃｒ合金元素与氧离子的化学反应活性差异及三种金属元素间的相互作用规律．经低能氧离子溅射后,不锈钢表面形成了一薄层氧化物膜,元素Ｃｒ和Ｎｉ分别以Ｃｒ２Ｏ３和ＮｉＯ形式存在;铁元素的氧化产物随氧离子溅射量的增加分别以ＦｅＯ、ＦｅＯ和Ｆｅ２Ｏ３。共存、全部生成Ｆｅ２Ｏ３的形式存在．在ＳＵＳ ３０４不锈钢中,铬元素与氧离子的化合能力最强,铁元素次之,镍元素的化合能力较弱．同纯金属与氧离子的化合行为比较发现：三种金属元素合金化后,铁、铬元素与氧离子的化合能力提高,而镍元素的氧化速度降低．氧化过程中铁元素与银元素间存在相互作用,只有当铁元素与氧离子反应生成Ｆｅ２Ｏ３后,镍元素才开始氧化．     

TiC－PHASE DIFFUSION LAYER FORMATION IN TITANIUM CLAD STEEL COMPOSITE HAVING AN INTERMEDIATE LAYER OF α－Fe

ＴｉＣ－ＰＨＡＳＥＤＩＦＦＵＳＩＯＮＬＡＹＥＲＦＯＲＭＡＴＩＯＮＩＮＴＩＴＡＮＩＵＭＣＬＡＤＳＴＥＥＬＣＯＭＰＯＳＩＴＥＨＡＶＩＮＧＡＮＩＮＴＥＲＭＥＤＩＡＴＥＬＡＹＥＲＯＦα－ＦｅＸｉａＣｈａｎｇｑｉｎｇ；ＪｉｎＺｈａｎｐｅｎｇ（Ｄｅｐａｒｔｍｅｎ...     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

The First Phase of the SRIF Industrialized Base in ＂West Area＂ Has Been Put into Operation

After nearly two years＇ tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry （SRIF）, located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.     

THERMODYNAMICS STUDY ON THE DECOMPOSITION OF CHROMITE WITH KOH

Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process.     

INFLUENCE OF HEAT TREATMENT ON DAMPING BEHAVIOUR OF THE MAGNESIUM WROUGHT ALLOY AZ61

The effect of isochronal heat treatments for 1h on variation of damping, hardness and microstructural change of the magnesium wrought alloy AZ61 was investigated. Damping and hardness behaviour could be attributed to the evolution of precipitation process. The influence of precipitation on damping behaviour was explained in the framework of the dislocation string model of Granato and Lücke.     

Theoretical Analysis for the Motion and Temperature of Melt Droplets in Spray Degassing Process

The motion of melt droplets in spray degassing process was analyzed theoretically. The height of the treatment tank in spray degassing process could be determined by the results of theoretical calculation of motion of melt droplets. To know whether the melt droplets would solidify during spraying process, the balance temperature of melt droplets was also theoretically analyzed. Then proof experiments for theoretical results about temperature of melt droplets were carried. In comparison, the experimental results were nearly similar to the calculation results.     

Growth Kinetics of Single Inclusion Particle in Molten Melts

On the basis of the single-particle framework, a new theory on inclusion growth in metallurgical melts is developed to study the kinetics of inclusion growth on account of reaction and collision. The studies show that the early growth of inclusion depends on reaction growth and Brawnian motion collision, and where the former is decisive, the late growth depends on turbulence collision and Stokes＇ collision, and where the former is dominant; collision growth is very quick during the smelting process, lessened in the refining process, but nearly negligible in the continuous casting process.     

An Easy Way to Quantify the Adhesion Energy of Nanostructured Cu/X(X=Cr,Ta,Mo,Nb,Zr) Multilayer Films Adherent to Polyimide Substrates

An approach based on film buckling under simple uniaxial tensile testing was utilized in this paper to quantitatively estimate the interfacial energy of the nanostructured multilayer films(NMFs) adherent to flexible substrates. The interfacial energies of polyimide-supported NMFs are determined to be *5.0 J/m2 for Cu/Cr, *4.1 J/m2 for Cu/Ta,*2.8 J/m2 for Cu/Mo, *1.1 J/m2 for Cu/Nb, and *1.2 J/m2 for Cu/Zr NMFs. Furthermore, a linear relationship between the adhesion energy and the interfacial shear strength is clearly demonstrated for the Cu-based NMFs, which is highly indicative of the applicability and reliability of the modified models.     

High-Speed Friction Stir Welding of SiC_p/Al–Mg–Si–Cu Composite

A 17 vol% SiCp/Al–Mg–Si–Cu composite plate with a thickness of 3 mm was successfully friction stir welded(FSWed) at a very high welding speed of 2000 mm/min for the first time. Microstructural observation indicated that the coarsening of the precipitates was greatly inhibited in the heat-affected zone of the FSW joint at high welding speed, due to the significantly reduced peak temperature and duration at high temperature. Therefore, prominent enhancement of the hardness was achieved at the lowest hardness zone of the FSW joint at this high welding speed, which was similar to that of the nugget zone. Furthermore, the ultimate tensile strength of the joint was as high as 369 MPa, which was much higher than that obtained at low welding speed of 100 mm/min(298 MPa). This study provides an effective method to weld aluminum matrix composite with superior quality and high welding efficiency.     

A STUDY OF TEMPERATURE-DEPENDENT VALENCE BOND STRUCTURE OF TITANIUM

On the basis of energy and shape method for the determination of the valence bond (VB) structures of crystal, the valence bond structure of titanium is redetermined at room temperature and calculated in the whole temperature range of 0-1943K. The outer shell electronic distribution of Ti is e_c~(2.9907) · (s_c~(0.4980) d_c~(2.4927)) ef1.0093 in crystal. The temperature dependences of the VB structures of hcp and bcc phases are the same. The VB structures of hcp and bcc phases monotonically increase or decrease with the increase in temperature, but show discontinuous changes at the phase-transformation temperature 1155K.     

新型的治疗阿尔茨海默氏症药物(1-二甲基磷酰基-2,2,2-三氯)-乙基-1-醇烟酸醋对体外神经细胞的作用

目的: 观察本实验室合成的一种治疗阿尔茨海默氏症(AD)的药物(1-二甲基磷酰基-2, 2, 2 -三氯)-乙基^-1-醇烟酸醋(NMF),对体外培养的皮层神经细胞活性的影响以及对海人藻酸(KA)所致的神经损伤的保护作用。方法: 采用体外培养皮层神经元的方法,解剖分离 15 d胚胎小鼠皮层神经细胞, 接种于 96孔板,48 h 后加药并培养 72 h,以 MIT 法 观察 NMF 对小鼠皮层神经细胞活性的影响;同时将接种于 24 孔板的细胞预先给予 NMF,d 3 时加或不加KA处理后,以台盼蓝染色鉴别并计数死、活细胞,可得出细胞的存活率。结果: NMF 明显促进胎鼠皮层神经元活性,其中 NMF1、0. 1、10nmol·L^-1促进神经元活性增殖率分别高达 34.7%、37.4%、36. 7%, NMF 明显促进正常胎鼠皮层神经元存活卒,与对照组比较,10nmol·L^-1 NMF 对皮层神经元的存活率分别提高 39.3%、73.5%。 NMF能显著 对抗 KA 所致的神经元损伤,与 KA 损伤组相比, NMF0.1、10、10nmol·L^-1对损伤皮层神经元的保护率分别为 77.30%、80.10%、84.15%。结论: NMF 明 显促进胎鼠皮层神经元的洁性、提高正常皮层神经元,的存活卒,并能有效地保护KA所致的神经元损伤,提示 NMF 是一种很有潜力的治疗 AD 的药物。