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无氰电镀黄铜工艺研究 被引量:2
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作者 冯绍彬 李振兴 +2 位作者 胡芳红 栗斌 徐明达 《金属制品》 2009年第2期21-23,共3页
针对三步法钢丝电镀黄铜工艺复杂、冗长,维护和管理难度高,以及热扩散工序耗能高等问题,研究出一步法焦磷酸盐无氰直接电镀黄铜工艺。介绍电镀工艺配方以及测试方法,给出镀层中Cu与Zn的质量分数计算公式。通过试验得出:电流密度在0.5~1... 针对三步法钢丝电镀黄铜工艺复杂、冗长,维护和管理难度高,以及热扩散工序耗能高等问题,研究出一步法焦磷酸盐无氰直接电镀黄铜工艺。介绍电镀工艺配方以及测试方法,给出镀层中Cu与Zn的质量分数计算公式。通过试验得出:电流密度在0.5~1.2A/dm2时,随着电流密度的增加,镀层中铜含量下降,锌含量不断提高,电流密度超过1.2A/dm2时,镀层中铜含量随电流密度的提高而增加,锌含量不断减少;辅助络合剂质量浓度为60g/L时,镀层中Cu,Zn质量比基本达到60∶40,满足产品结合力的要求;当起始电流密度大于临界电流密度(0.28A/dm2)时镀层结合力良好,小于0.28A/dm2时镀层的结合力较差。试验表明,用一步法工艺配方电镀黄铜钢丝,镀层结合力好,合金成分稳定,沉积速度快,生产线容易改造,且能达到清洁生产,节能降耗的目的。 展开更多
关键词 无氰电镀黄铜 轮胎钢帘线 电流密度 辅助络合剂
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Innovative Application of Scrap-Tire Steel Cords in Concrete Mixes
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作者 Ahmed N. Bdour 《Journal of Environmental Science and Engineering(B)》 2012年第4期441-446,共6页
Many researchers have investigated the use of recycled tire products in several traditional civil engineering materials. This research is exploring the use of steel cords, a by-product of the tire recycling process, i... Many researchers have investigated the use of recycled tire products in several traditional civil engineering materials. This research is exploring the use of steel cords, a by-product of the tire recycling process, in concrete mixes. Different concrete specimens were fabricated and tested in uniaxial compression and splitting tensile strength. The steel cords were substituted into the concrete mix in volumetric percentages of various ratios. Results show that mechanical properties of concrete made with steel cords are improved compared with concrete mix made with the traditional scrap-tires recycled material. Also, results show that even though the compressive strength is reduced when using steel cords, this reduction is minimal. When 2% of steel cords are used there is 18% increase in ductility. Moreover, splitting tensile tests show that concrete mixtures with any steel cords content have much greater toughness than control mixture. This mechanical property mix indicates an excellent potential application of modified concrete mix in structures that absorb large amount of energy. 展开更多
关键词 Steel cords scrap-tires splitting tension strength toughness.
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