2-氨基吡啶缩水杨醛席夫碱对Q235钢在盐酸介质中的缓蚀性能

合成了一种吡啶衍生物：2-氨基吡啶缩水杨醛席夫碱(PMP),并通过静态失重、动电位极化曲线和电化学阻抗谱等方法,研究了其对Q235钢在1 mol/L HCl溶液中的缓蚀性能。结果表明,在(30±1) ℃下1 mol/L HCl溶液中,当PMP浓度达到15.0 mmol/L时,缓蚀效率为87.9%,是以阴极型为主的混合型缓蚀剂。PMP在Q235钢表面吸附符合Langmuir吸附等温式,吸附过程包括物理吸附和化学吸附。     

2-吡啶甲醛缩氨基硫脲席夫碱在HCl溶液中对Q235钢的缓蚀作用

合成了2-吡啶甲醛缩氨基硫脲席夫碱(2-PCT)。采用失重法、动电位极化曲线、电化学阻抗谱和扫描电子显微镜等方法研究了2-PCT在1mol·L-1 HCl溶液中对Q235钢的缓蚀作用。结果表明,2-PCT对Q235钢在HCl溶液中具有优良的缓蚀作用,当缓蚀剂浓度达到1mmol·L-1时,缓蚀率达到95.38%,其在Q235钢表面吸附符合Langmuir吸附等温式。     

一种苯胺类席夫碱对N80钢在盐酸介质中的缓蚀性能

合成了一种席夫碱:4-氯-N-[(吡啶-4基)-亚甲基]苯胺(CNP),并采用失重法、电化学阻抗谱和动电位极化曲线等,研究了CNP对N80钢在1mol/L HCl溶液中的缓蚀性能。结果表明,在1mol/L HCl溶液中,当缓蚀剂摩尔浓度为1.0mmol/L时,缓蚀率达到86.17%。其在N80钢表面吸附满足Langmuir吸附等温式,是一种混合型缓蚀剂。     

新型三唑衍生物缓蚀剂在HCl中的缓蚀性能

用失重法、电化学方法研究新型三唑衍生物在1 mol/L HCl中缓蚀性能以及在Q235-A钢表面的吸附行为.结果表明,新型三唑缓蚀剂是一种混合型缓蚀剂,在1 mol/L HCl溶液中最高缓蚀率达到95%以上,在Q235-A钢表面的吸附行为符合Langmuir吸附等温式,且吸附为吸热反应.     

含咪唑啉磷酸酯的复配缓蚀剂对Q235钢的缓蚀行为研究

将自制咪唑啉磷酸酯盐与KI复配,采用失重法、极化曲线和交流阻抗法研究了该缓蚀剂在1mol/L HCl水溶液中对Q235钢的缓蚀行为,探讨了其在Q235钢表面的吸附行为。结果表明：该缓蚀剂在1mol/L HCl水溶液中对Q235钢为混合偏阴极型缓蚀剂;缓蚀率随缓蚀剂浓度的增大而增加;该缓蚀剂在Q235钢表面的吸附模式遵循Langmuir吸附。     

苯胺四聚体聚乙二醇嵌段共聚物在盐酸介质中对Q235钢的缓蚀性能

目的研究苯胺四聚体PEG两亲性嵌段共聚物(PEG-TA)对Q235钢在1 mol/L HCl介质中的缓蚀性能。方法采用静态失重测试、电化学测试、腐蚀表面形貌分析研究了自制的PEG-TA在1 mol/L HCl介质中对Q235钢的缓蚀性能,并探讨了其在Q235钢表面的吸附行为。结果红外和紫外表征表明,氨基封端苯胺四聚体和聚乙二醇为原料成功合成了两亲性嵌段共聚物PEG-TA。极化曲线研究表明,PEG-TA的加入明显可以抑制Q235钢在1 mol/L HCl介质中的腐蚀,且随着PEG-TA浓度的增加,缓蚀效果越好,在25℃的实验温度范围内,质量浓度为30 mg/L时,PEG-TA的缓蚀效率可以达到93.97%,属于阴极抑制为主的混合型缓蚀剂。电化学阻抗图谱研究表明,随着PEG-TA浓度的增加,Q235钢表面腐蚀反应的电荷转移电阻和膜电阻逐渐增大,钢表面缓蚀剂的含量和覆盖率增加,腐蚀抑制性增强。PEG-TA缓蚀剂分子在Q235钢表面的吸附遵循Langmuir等温模型,并且属于物理和化学混合吸附。SEM研究证明,在1 mol/L HCl中,PEG-TA可有效地抑制碳钢的腐蚀。结论 PEG-TA在1 mol/L HCl中有效提高了Q235钢的耐蚀性,是一种高效环保的缓蚀剂。     

咪唑啉季铵盐对Q235钢在盐酸溶液中的缓蚀性能

合成了苯乙酸咪唑啉季铵盐(PAIPI)和萘乙酸咪唑啉季铵盐(NAIPI),通过失重法、电化学方法研究了两者在1 mol/L HCl中对Q235钢的缓蚀性能,并探讨了其在Q235钢表面的吸附行为.结果表明,两者在1 mol/LHCl中对Q235钢均为阳极型缓蚀剂,其中NAIPI对Q235钢的缓蚀性能优于PAIPI;两者在Q235钢表面均是单层吸附,属于物理吸附.     

含席夫碱结构碳点缓蚀剂的简易可扩展制备及性能研究

目的 克服目前制备碳点(Carbon dots, CDs)缓蚀剂存在的耗时、耗能等缺点，在室温下一步制备含席夫碱结构的CDs缓蚀剂，并研究其对Q235碳钢的缓蚀性能。方法 设计了一种简易、可扩展的制备方法，以邻苯二胺和对苯醌为前驱体，无需高温加热便可在室温下反应2 h，从而获得含席夫碱结构的CDs。利用TEM等方法对其结构进行表征，并采用UV和PL光谱评估其在HCl溶液中的长期分散稳定性。通过失重法、电化学测试方法研究了不同浓度CDs对Q235碳钢在1 mol/L HCl溶中的缓蚀性能。通过SEM和三维轮廓测量仪分析腐蚀后碳钢表面形貌及化学组成，提出CDs的缓蚀机理。结果 CDs含C=N键，具有多种含氧、含氮基团，有利于其在钢表面的吸附。CDs在HCl溶液中具有长期分散稳定性。当添加浓度为200 mg/L时，其对碳钢在1 mol/L HCl溶液中的缓蚀效率可达到95.05%。CDs为混合型缓蚀剂，能够同时抑制阴极和阳极反应。CDs在碳钢表面的吸附方式遵循Langmuir等温吸附模型，其缓蚀机理为通过物理和化学吸附方式在碳钢表面形成一层保护膜，从而抑制碳钢的腐蚀。结论 成功为CDs缓蚀剂的合成提供了一种简易、可扩展、高效、省时的方法，而且证明了具有席夫碱结构的CDs对碳钢在1 mol/L HCl溶液中的腐蚀具有显著的抑制能力。     

季铵盐双子表面活性剂的缓蚀性能研究

采用自制的季铵盐双子表面活性剂1,6-二(癸烷基吗啉)己烷(HDMB)作为缓蚀剂,用失重及极化曲线研究了该表面活性剂在1 mol/L盐酸溶液中对Q235钢的缓蚀效果.失重结果表明:在1 mol/L盐酸溶液中HDMB对Q235钢具有良好的缓蚀作用,缓蚀率随缓蚀剂浓度的增加而增大,当浓度达到0.1 mmol/L时,缓蚀率趋于稳定.通过吸附理论、动力学和热力学公式得到相应的参数,并讨论了缓蚀作用机理;极化曲线法表明:HDMB为混合抑制型缓蚀剂.     

O,O'-二(2-苯乙基)二硫代磷酸二乙铵在HCl溶液中对Q235钢的缓蚀性研究

合成了一种新型缓蚀剂O,O'-二(2-苯乙基)二硫代磷酸二乙铵(EPP),并用元素分析和红外光谱对其进行了表征。采用静态失重法、极化曲线法和电化学阻抗法研究了EPP在HCl溶液中对Q235钢的缓蚀性能,探讨了其在Q235钢表面的吸附行为,考察了HCl浓度、腐蚀体系温度等因素对其缓蚀率的影响。结果表明:EPP是一种高效的混合型缓蚀剂,其缓蚀率随缓蚀剂浓度增加而增大,随腐蚀系统温度升高而缓慢减小。在30℃,1.0 mol·L-1的HCl溶液中,EPP浓度为60 mg·L-1时,其缓蚀率高达98.48%。EPP在Q235钢表面的吸附符合Langmuir吸附等温式,属于自发进行的化学吸附。量子化学计算结果表明,EPP通过配位键和反馈键与金属Fe形成了多中心、稳定的化学吸附。     

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.     

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。     

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.