新型钒基新能源汽车电池负极合金的制备与性能研究

采用自蔓延高温合成法制备了添加不同含量合金元素Al或Cr的新型钒基新能源汽车电池负极合金V65Ti20Ni15,并进行了显微组织、电化学循环稳定性和耐腐蚀性能的测试与分析。结果表明,合金元素Al或Cr,有助于改善合金内部组织,提高合金的电化学循环稳定性和耐腐蚀性能;复合添加合金元素Cr和Al的V59Ti20Ni15Al3Cr3合金的电化学循环稳定性和耐腐蚀性能最佳。与不添加合金元素的V65Ti20Ni15合金相比,复合添加合金元素Cr和Al的V59Ti20Ni15Al3Cr3合金的充放电循环50次后放电容量衰减率从85%减小到23%、腐蚀电位正移692 mV,合金的电化学循环稳定性和耐腐蚀性能得到显著提高。     

铜铋对铅钙锡合金组织与电化学性能的影响

研究添加少量的铜、铋对铅钙锡合金性能的影响,对不同铜、铋含量的铅钙锡合金的电化学性能进行了测试,并对合金的组织结构进行观察.实验结果表明:铋的加入降低了阳极氧气的析出过电位,同时可以提高合金的耐腐蚀性能;而铜加速了铅钙锡合金的腐蚀.     

SiO2浓度对Zr-4合金包壳管力学和腐蚀性能的影响

Zr-4合金包壳管在核工业中应用广泛,为探究一回路水质环境中SiO2的浓度对Zr-4合金组织性能的影响,利用高温高压反应釜模拟锆管在反应堆一回路的工作环境来开展实验.以显微硬度值和腐蚀失重值为指标,研究了锆管在不同SiO2浓度下的力学性能和腐蚀性能.结果表明,随着SiO2浓度的增加,Zr-4合金的显微硬度值逐渐提高,但在腐蚀介质环境中的耐腐蚀性能明显降低.     

NiTi合金腐蚀性能研究

研究了稀氯化物溶液(模拟人体生理环境)中NiTi合金的腐蚀行为。NiTi合金的镍离子析出量小于316L不锈钢。NiTi—B合金的耐腐蚀性能优于NiTi—A合金。砂纸抛光 氧化处理的NiTi合金的耐腐蚀性能优于砂纸抛光处理的NiTi合金。NiTi合金的耐腐蚀性能随热处理温度的升高及热处理时间的延长而提高；在500℃／90min时，NiTi合金耐腐蚀性能最佳。NiTi合金的耐腐蚀性能与其表面形成的氧化膜有关。     

武钢含铜钢历年研制简况

毛主席说:一切产品,不但求数量多,而且求质量好,耐穿耐用。低合金高强度钢是一种含有少量合金元素,屈服强度比炭素钢钢三提高50%以上,具有良好的焊接性能和耐腐蚀性能的钢。它的生产工艺并不比炭素钢复杂,只稍许加入某些合金元素或进行一定的热处理,生产成本增加的不多便能生产,所以这是一种符合     

锡黄铜管应力腐蚀破裂机理的探讨

黄铜是由铜和锌两种金属所组成的合金,具有耐蚀、强度高和工艺性能好等优点,然而在使用过程中易于脱锌,降低了其耐蚀性能。而在其中加入少量的合金元素锡及砷,就能极大地抑制其脱锌,从而提高其耐蚀性能。我厂现在生产的Hsn76—1A锡黄铜即属此例。其化学成份见表1。这种锡黄铜在淡水、海水中均耐蚀,广泛用于热电厂和船舶的冷凝管。合金化的结果不仅提高了其耐蚀性能,而且也提高了其屈服强度,由于Hsn70—1A是α单相合金,其层错能较低,易于滑移,所以其延伸性能也较好。表2为T_2紫铜,H62黄铜以及Hsn70—1A     

高强耐磨黄铜的研究现状

黄铜作为铜合金产品中重要合金之一,具有优良的力学性能、耐腐蚀性能及冷热加工性能等.通过在该合金中添加少量的合金元素如锰、铝、铁等,可以明显提高合金的强度和耐磨性能,广泛应用于工业生产中对强度和耐磨性能要求很高的精密制造行业.文章综述了高强耐磨黄铜的国内外研究现状及主要的性能特点,并从合金的组织结构、第二相的分布、热处理工艺等方面对影响其性能的主要因素进行了较为深入的探讨,最后对其发展前景提出了几点展望.     

添加元素对贮氢电极材料 MlNi3.8(CoMn)1.2电化学及高温性能的影响

研究了微量元素Ti,Zr,Al对MlNi3 .8(CoMn) 1.2 合金电化学性能及高温性能的影响。添加少量铝虽然使合金在室温的放电容量和高倍率放电容量降低 ,但可显著提高高温下的容量 ,并有效抑制自放电 ,提高循环稳定性 ;添加少量钛或锆均降低合金的放电容量 ,但可改善高倍率放电性能。锆还可提高合金的循环稳定性 ,延长电极寿命。     

化学镀Ni-Mo-P合金耐腐蚀性能的研究

对化学镀Ni-Mo-P合金耐腐蚀性能的进行研究,主要探究在适当浓度下镀态和不同温度下热处理对合金腐蚀性的影响,通过极化曲线测定结果表明,热处理温度达200℃以上时,最有利于镀层耐腐蚀性能的提高.     

含镍合金在海水中的腐蚀性能

1 前言 海洋环境的侵蚀性要求在海水作业中采用耐腐蚀材料。目前最常用的合金是含镍合金,如铜-镍合金、镍基合金和不锈钢。这些合金的性能非常适合于许多海洋用途,包括冷凝器管。     

The effect of varying ruthenium content on the corrosion behaviour of two cathodically modified superferritic stainless steels

The corrosion behaviour of two superferritic stainless steels, both containing varying amounts of ruthenium, was evaluated and compared in a 10% sulphuric acid solution. It was found that small additions of ruthenium increased the corrosion resistance in both types of alloys dramatically. Apart from raising the corrosion potential of the base alloys, the cathodic Tafel slopes were also decreased with an increasing amount of ruthenium in each alloy type. The amount of ruthenium for an optimum increase in the corrosion resistance was found to be 0.16% for both types of alloy.     

Stress corrosion cracking of zirconium cladding tubes: IV. Effect of hydrogen saturation

The effect of hydrogen saturation on the stress corrosion cracking (SCC) resistance of zirconium cladding tubes in an iodine-containing medium is studied. Comparative SCC tests are performed for tubes produced from E110 and E635 alloys with various hydrogen contents (up to 400 ppm). Hydrogen is shown to decrease the SCC resistance of the tubes predominantly because of the activation of pitting formation processes.     

Microstructural control in an aluminum core alloy for brazing sheet applications

The use of aluminum alloys for automotive heat exchangers has increased considerably in the last 15 to 20 years, and in parallel, new alloys have been developed to meet the increased demand for higher strengths and improved corrosion resistance. An Al-Mn alloy, X800, has been developed by Alcan to significantly increase the corrosion resistance of radiator tubes when subjected to typical service environments. Conventional alloy tubes, 3xxx or 6xxx, fail by intergranular attack, whereas X800 utilizes the diffusion of Si during brazing to form a sacrificial layer between core and cladding and thus prevent penetration through the core. The Si penetrates up to a depth of 70 μm into the core alloy and combines with both the Mn in solid solution and the coarse constituent particles to form theα-AlMnSi phase. In contrast to the core, the interface layer exhibits a high dispersoid density, a modified coarse particle chemistry, and a lower Mn level in solid solution after brazing. Three layers remain after brazing; anα-Al residual cladding, the interface layer with a band of dense precipitates (BDP), and the X800 core. Free corrosion potential measurements confirmed the lowering of the potential within the BDP by about 30 mV compared to —710 mV for the brazed X800 core.     

Stress corrosion cracking of zirconium cladding tubes: III. Effect of the alloy strength

The stress corrosion cracking resistance of zirconium T110, E635, and Zirkaloi-4 alloys of different strengths provided by different mechanisms of hardening (solid solution, precipitation, and strain hardening) is studied. It was shown that the stress corrosion resistance of the tubes decreases when the alloy strength increases, in particular, at strain hardening.     

The effect of heat treatment on the fatigue and corrosion fatigue behavior of a CuNiCr alloy

Fatigue experiments were conducted on a CuNiCr alloy (IN838) in air and in 0.5 N NaCl solutions under conditions of free corrosion and of applied anodic currents. The alloy was heat treated to produce a solutionized structure and also to produce a precipitation hardened structure. The fatigue behavior of the solutionized alloy was unaffected by free corrosion although increased corrosion rates resulted in a decrease in fatigue resistance for small applied anodic currents. The age hardened alloy showed a decrease in fatigue resistance under free corrosion conditions and a further decrease in resistance with small applied anodic currents. In both heat treatments fatigue in air resulted in mixed transgranular-intergranular crack initiation and propagation while corrosion increased the relative amount of intergranular cracking. These results can be explained by a consideration of previously developed fatigue and corrosion fatigue models of pure copper and copper aluminum alloys. H. N. Hahn, formerly with Rensselaer Polytechnic Institute     

HSn70-1AB管在使用过程中的腐蚀行为研究

采用扫描金相-微区成分分析，拉伸力学性能测试和X射线衍射生物相分析方法对HSn70-1AB管服役前后和不同服役条件下管内壁的腐蚀特性进行了观察和分析。结果表明：HSn70-1AB管服役前后的组织性能符合国家标准GB／T8890—1998的要求；新管镀膜后使用18个月之后内壁出现相对较厚的不均匀疏松沉积层，且沉积层中发现含量较高的CuS和CuCl2，说明循环冷却水中硫元素和氯元素参与了腐蚀过程。去除沉积层后，管内壁产生了腐蚀现象。     

Phase structure and electrochemical properties of laser sintered La2MgNi9 hydrogen storage electrode alloys

Phase structure and electrochemical properties of laser sintered La2MgNi9 alloys were studied. The sintered alloys contained a main phase, LaNi5, and a ternary La-Mg-Ni phase, with a PuNi3 structure and a small amount of LaMgNi4. The ternary La-Mg-Ni phase with a PuNi3 structure had the composition of La1.8Mg1.2Ni9 and La2MgNi9, for alloys laser sintered at 1000 and 1400 W, respectively. Owing to further reactions between LaNi5 and LaMgNi4, the amount of the PuNi3 phase increased for alloys sintered at 1400 W. Both alloys had good activation property (three charge/discharge cycles). The discharge capacities of the sintered alloys were 321.8 and 344.8 mAh/g, respectively. Compared with the alloy laser sintered at 1000 W, the poor cyclic stability of the alloy sintered at 1400 W was mainly attributed to the lower corrosion resistance of the La2MgNi9 phase.     

含Er镁合金的研究进展

综述了稀土元素Er在镁合金中的作用及对镁合金显微组织、力学性能和耐蚀性能影响的研究进展.Er可以净化镁合金熔体并对熔体具有良好的阻燃作用;稀土Er可以细化合金的晶粒组织,影响析出相的形态、数量、大小和分布,提高了镁合金的力学性能和耐腐蚀性能.     

Stress corrosion cracking of zirconium cladding tubes: II. Mechanisms and kinetics

The mechanisms and kinetics of corrosion fracture of thin-wall cladding tubes of zirconium alloys in a methanol-iodine medium are determined by a direct comparison of the acoustic emission parameters with the characteristics of accumulated corrosion defects in a material during stress corrosion cracking tests. The main types of corrosion defects (nucleation, development, interaction) are revealed and quantitatively described. A general sequence of nucleation and development of corrosion defects is established for all types of tubes.     

含Cu镁锂合金组织与性能调控研究进展

镁锂合金具有超低密度、极高的比强度与比刚度、优异的电磁屏蔽性能及阻尼性能,目前广泛应用于追求轻量化的航空航天、新能源汽车、电子产品、生物医疗等领域。由于合金元素镁和锂均为活泼金属,在服役过程中镁锂合金会存在多种形式的腐蚀过程,同时二元镁锂合金强度较低,以上两点严重制约了其广泛应用。耐蚀涂层可以有效提高镁锂合金的腐蚀抗力,含铜镀层被证实能够提升镁锂合金耐蚀性。改善镁锂合金强度的工艺主要有合金化、热处理、加工变形等,其中合金化是最基本的强化手段。Cu合金化可以对镁锂合金中的组织与性能进行调控,改善镁锂合金的强度。本文对含Cu镁锂合金的研究进展及其应用情况进行综述,总结了目前含Cu镁锂合金耐蚀与力学性能的相关研究成果,重点梳理了铜元素在镁锂合金中的作用,为含Cu镁锂合金的实际应用提供一定的理论指导。