一种300M钢材料镀锌镍工艺研究与应用

通过在一种超高强度钢上镀锌镍工艺的研究,探索出一种超高强度钢材料镀锌镍的工艺流程、工艺方法、工艺参数和电流精准控制装置。通过性能测试,耐蚀性能不低于360h;氢脆性在进行75%缺口极限抗拉强度载荷下200小时不发生断裂;镀层和基体的结合力应良好,进行弯曲结合力测试,不会产生镀层和基体剥离、起泡现象;疲劳强度优于同材料电镀的低氢脆镀镉工艺和无氰镀镉钛工艺;此外,这种镀锌镍工艺和目前镀镉、镀镉钛等工艺相比,不含重金属镉和铬,不会对环境和人体造成伤害。

锌-镍合金镀液中锌、镍、氢氧化钠的分析方法

锌的测定方法,用抗坏血酸还原三价铁离子,再加入氰化物掩蔽Fe2+、Zn2+、N i2+、Cu2+等,而锌氰配位化合物不稳定,加甲醛即被解蔽,以铬黑T为指示剂用EDTA滴定。N aOH的测定,用中和滴定法完成。镍是用比色分析法,在碱性溶液中,当有氧化剂存在时,利用镍与丁二酮肟不产生沉淀而形成酒红色化合物的特性,以吸光光度法测定镍的含量。

铝及其合金电镀光亮锡-铅合金工艺研究

研究了采用浸锌-锡合金与预镀镍相结合的方法,在铝及其合金表面形成一层中间层再电镀光亮锡-铅合金工艺。介绍了铝及其合金制件的脱脂、碱蚀、出光及预镀等预处理工艺和配方,探讨了浸锌-镍合金溶液的配制、温度及时间对镀层性能的影响。结果表明,该工艺所获得的镀层结晶细致、光亮、焊接性能高、结合力强。

Analysis of Differences in Inductance of Ni-Cu-Zn Ferrite Chip Inductors during the Plating Process

Although plating is a necessary process for SMT components, it alters the magnetic characteristics and inductance level of Ni-Cu-Zn ferrite components. The results of this work show that the following three factors in plating affect these components, and the effects are different for Ni- and Sn-plating： （1） Plating layers exert stresses and react with the residual stress of components to change the inductance level, and the effect of the tin layer is greater than that of the nickel one; （2） The plating current induces a magnetic field inside the components directly and indirectly, and this remains as remanence inside the components and reduces the inductance level, and the effect level of Ni-plating is greater than that of Sn-plating; （3） The plating solution corrodes the interface of the termination and ferrite core of the components to release the residual stress, and causes an increase in inductance, and the effect of Sn-plating is greater than that of Ni-plating. In addition, the inductance level is the result of the net effect of these three factors, and if the sintering temperature is increased to change in the type of residual stress, the net effect will be changed.

雷达液压缸活塞杆的防腐蚀技术研究

针对某型机动雷达在使用过程中暴露出的液压缸活塞杆抗腐蚀性能不足的问题,分析了乳白-耐磨双层镀铬、QPQ处理、锌镍合金-硬铬复合镀3种防腐蚀技术及其性能,提出了将电镀锌镍合金作为底镀层的锌镍合金-硬铬复合镀技术,并对试样进行了240 h盐雾试验、高温贮存试验、低温贮存试验、交变湿热试验和附着强度试验。试验结果表明,采用锌镍合金-硬铬复合镀的液压缸活塞杆抗腐蚀性能远优于采用乳白-耐磨双层镀铬、QPQ处理的活塞杆,能够显著提高机动雷达抗恶劣环境的能力。