热镀用大锭锌合金生产实践

本文介绍了热镀用锌合金的生产方法，并通过配制二元合金、控制炉温、增加搅拌等方式提高了锌合金的质量，在生产实践中产品合格率由90％提高到98％，并取得了很好的经济效益。     

国际信息

泰国巴丹公司计划增加锌合金产量由于泰国压铸行业和汽车行业对锌合金需求增加,泰国锌生产者巴丹公司计划于今年年底之前将锌合金产量提高25%,公司已经投入2亿泰铢提高锌合金的生产能力。     

锌合金用搅拌机的改进

文章针对锌合金生产用搅拌机存在一些问题进行了分析,并提出了改进意见,改进后的搅拌机有效地减少了维修时间,提高了生产效率,节约了生产成本。     

锌合金质量控制中应注意的几个问题

为了提高锌合金产品质量,本文从产品实现过程的策划、生产准则的确定及工艺参数的监控三个方面阐述了加强质量控制的途径,并重点从锌合金配料、熔炼及浇注三道生产工序入手,分析了影响产品质量的各种因素,提出应在产品实现过程策划中考虑周详,制定的作业文件操作性强,工艺参数的监控合理、全面、严格,以提高质量控制的效果。     

稀土对Zn-Al-Cu合金机械性能的影响

研究了不同铝铜含量锌合金的强度,并加入适量的Ti,B,RE,Mg等元素,得出模具用锌合金的最佳铝铜含量（%,质量分数）分别为Al14%,Cu10%。重点研究了不同稀土含量（0,0.05%,0.1%,0.2%,0.4%,0.6%）对锌合金的影响,每种合金分别采用空冷和水冷两种冷却方式,结果表明,稀土含量为0.4%的合金为模具用锌合金的最佳稀土含量,其中以水冷方式为最佳的冷却方式。     

锌合金加工用感应电炉及其应用

介绍了用于锌合金加工的感应电炉的设计要点及其特点,采用感应电炉加工生产锌合金,生产效率高、操作灵活,产品质量及其稳定性大大提高.     

稀土铈和热处理对高铝锌合金减振性能的影响

采用共振法对稀土铈和热处理对高铝锌合金减振性能的影响进行了试验研究。试验结果表明,加铈变质可以细化高铝锌合金ZA-27的铸态组织,使其减振性能提高近一倍。热处理(360℃×2h,水淬)可提高高铝锌合金ZA-27和ZA-22的减振性能20～60%。高铝锌合金的减振属于动态滞后机理。     

制备工艺对锌合金牺牲阳极性能影响的研究

介绍了锌合金牺牲阳极带的铸造、挤压生产过程,对影响其质量的各种因素进行了详细分析,同时探讨了提高产品质量应采取的措施.     

锌合金加工用感应电炉及其应用

介绍了用于锌合金加工的感应电炉的设计要点及其特点,采用感应电炉加工生产锌合金,生产效率高,操作灵活,产品质量及其稳定性大大提高。     

真空蒸馏分离铝锌合金的研究

研究了真空蒸馏法进行铝锌合金分离的可行性和规律性,实验结果表明,采用真空蒸馏法进行铝锌合金的分离是可行的,并确定了实验的最佳参数;蒸馏时间为40min,蒸馏温度为1053K.在此条件下可将铝锌合金中的锌含量降低到0.1%,得到的实验结果与理论相一致.     

真空蒸馏处理锌合金的研究

研究了用真空蒸馏的方法处理工业生产过程中产出的锌合金，诸如热镀锌渣、硬锌等，以回收金属锌和其他有价金属，获得了较好的结果。     

锌电积用惰性阳极材料的研究现状

锌电积长期采用Ph—Ag合金为阳极。该阳极存在析氧过电位高、易腐蚀且污染阴极锌等问题,因此人们研究了各类新型阳极。阐述了国内外铅及铅合金阳极、复合电催化铅基阳极、钛基DSA阳极及其他基体阳极材料的研究现状,着重指出了铝基阳极材料具有较好的发展前景,并对未来锌电积用惰性阳极材料的发展趋势进行了展望。     

Corrosion of Co-Cr-W alloy in liquid zinc

The corrosion of Co-Cr-W alloy in the presence of both static and dynamic liquid zinc has been investigated at 465 °C. It was shown that the Co-Cr-W alloy is severely attacked by liquid zinc especially under dynamic condition. The corrosion rate of this alloy in the moving liquid zinc was about 1.5 times higher than in static liquid. Corrosion of the Co-Cr-W cast alloy in liquid zinc can be characterized as alloying (of Co-Zn and Fe-Zn) and dissolution (of Cr and W atoms from Co-base γ phase into liquid zinc). The static corrosion of Co-Cr-W alloy is characterized as preferential corrosion in eutectic groups and uniform corrosion of Co-base γ phase. The dynamic corrosion of this alloy is characterized as frequent break of the corroded surface layer and preferential corrosion in grain boundaries besides uniform corrosion. The Fe content of this alloy is another important factor affecting its corrosion rate in liquid zinc. Based on these results, it is suggested that the amount of eutectic groups and the elemental Fe content in the Co-Cr-W alloy should be limited in order to improve its corrosion resistance in liquid zinc. Moreover, the refinement of its grain structure will also be useful for the improvement of its corrosion resistance.     

慢扫速示波计时电位法同时测定合金中的铅与锌

采用慢扫速示波计时电位法同时测定铝合金中的铅与锌。该方法具有简便、快速,干扰小,选择性高等优点,特别适合于在其它离子共存条件下,测定合金样品中某种金属元素的含量。通过对铝合金样品中铅、锌测定,平均回收率和RSD分别为99.18%,99.00%和11%,16%。     

双波长分光光度法测定铝合金中锌

应用锌试剂(2-羧基2’-羟基- 5’-磺苯甲(月替)作显色剂,以双波长分光光度法测定铝合金中的微量锌.在pH9.28的条件下,选择试剂和配合物的最大吸收峰波长(490nm、620nm)分别为参比波长和测定波长,读取吸光度差对锌浓度作图,0～2μg/ml范围内呈良好线性关系.由直线斜率计算摩尔吸光系数为4.4×10~4,是单波长光度法的2倍.样品分析结果与标准值一致,相对标准偏差<5%.     

特大型低银铅钙合金锌电解阳极工业化试验

对自主研发的特大型低银(含银0.2%)铅钙合金锌电解阳极(基地阳极)和某锌电解厂铅银(含银0.8%)铸造阳极进行锌电解对比试验,分别比较了锌电解阳极的重量损耗、电流效率、直流电单耗及析出锌质量。结果表明,不同阳极析出锌质量相当,基地阳极损耗低于铸造阳极,且具有更高的电流效率,基地阳极完全有望取代传统的铅银阳极。     

Influence of metals on IL-6 release in vitro

Certain dental alloys have been claimed to cause gingival and periodontal inflammation. However, little information is available on the molecules mediating the mechanism of such an effect. Recently, a three-dimensional cell culture system consisting of human fibroblasts and keratinocytes has been introduced for evaluating the irritancy of cosmetic products, including the analysis of inflammatory mediators. In the present study the influence of pure metals and a high noble dental cast alloy upon cell viability and the synthesis of the proinflammatory mediator interleukin-6 was recorded in this in vitro skin equivalent model. The cultures were exposed to test specimens fabricated from copper, nickel, cobalt, zinc, palladium, tin, indium, a high noble cast alloy and a dental ceramic. Cell vitality was reduced after a 24 h exposure to copper (14-25% of untreated controls), cobalt (60%), zinc (63%), indium (85%), nickel (87%), and the heat treated and not heat treated high noble cast alloy (87%/90%). Dental ceramic, palladium and tin did not influence cell viability. Increased IL-6 levels were observed in cultures exposed to copper (5-19-fold compared to untreated controls), zinc (16-fold), cobalt (12-fold), nickel (10-fold) and palladium (4-fold). Other materials tested produced IL-6 levels comparable to those of untreated controls. Our findings suggest that metal ions are involved in proinflammatory activity at low toxicity and non-toxic levels as assessed by different biological endpoints.     

合金锌粉在锌湿法冶炼锑盐净化工序中的应用

文章以锌湿法冶炼锑盐净化工序为基础,对合金锌粉与普通锌粉在该工序中净化除杂效果进行了对比试验.试验结果表明,合金锌粉的采用可以大大提高除钴镍的效果,尤其是除钴效率;同时,与普通锌粉相比,合金锌粉在保证净化效果的前提下可以大幅度节约净化锌粉的用量,经济效益明显;合金锌粉的最佳合金浓度一般为0.2%.     

热镀锌镀层合金最新研究进展和发展趋势

文章介绍了国内外有关热浸锌合金技术研究及工业应用情况,简述了各种合金镀层的性能及耐蚀原理,指出热镀锌合金发展热点和趋势,对热镀锌合金的研究工作具有指导意义.