共查询到18条相似文献,搜索用时 46 毫秒
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塑料粗化原理与实践 总被引:4,自引:1,他引:4
1 塑料粗化原理粗化是非金属材料电镀中的关键步骤 ,对镀层与塑料间结合力的影响显著。粗化可使非金属材料表面呈现微观粗糙 ,增大镀层与塑料基体的接触面积 ,提供“锚效应” ,并使塑料镀件表面由憎水体变成亲水体。未粗化的塑料表面带正电荷 ,对Sn2 +、Ag+、Pd2 +、Cu2 +都有排斥作用 ,无法进行敏化、活化 ,结合力不好甚至镀不上铜。经过粗化的塑料表面带负电荷 ,很容易吸附Sn2 +、Ag+等 ,使敏化、活化及化学镀铜或化学镀镍能够顺利进行。电镀级ABS塑料与普通ABS塑料的区别在于前者含橡胶相丁二烯B成分较多 ,比率为 18… 相似文献
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ABS塑料电镀的高锰酸钾前处理工艺 总被引:2,自引:1,他引:1
传统的铬酸粗化对环境有污染.采用高锰酸钾代替铬酸粗化ABS塑料,在塑料基体上化学镀镍后电镀铜镍,讨论了粗化时间、温度和高锰酸钾浓度对化学镀镍层质量的影响,并以化学镀镍层的表面状态和结合力为评价标准,确定了高锰酸钾粗化的最佳工艺.结果表明:20 g/L高锰酸钾,粗化温度70℃,粗化时间40 min时的粗化效果最优;所得铜镍镀层光亮、均匀,达到GB/T 12610-90质量要求;高锰酸钾最佳粗化工艺下粗化效果良好,可满足生产要求,且对环境污染小,具有广阔的应用前景. 相似文献
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粗化是实现活化液在ABS表面吸附的前提和获得良好结合力的必要条件.采用含痕量钯离子的铬酐-硫酸粗化液对ABS塑料表面进行化学粗化,用AFM、XPS和胶体钯吸附量等对粗化前后塑料的表面性能、价键状态和活性进行了考察.结果表明:钯离子加入到粗化液中对ABS表面的粗糙度影响不显著,粗化后的表面氧含量升高;随着粗化液中钯离子浓度的增加,胶体钯在ABS表面上的吸附量增加;增加粗化液中的Pd含量可使ABS表面在低浓度胶体钯溶液中达到与高浓度钯相同的吸附量,有效地降低了胶体钯的浓度.粗化液中加入钯离子不影响基体与镀层的结合力. 相似文献
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Spherical void expansion in plastics and rubber-modified plastics is investigated under radial traction conditions. The plastics
are modeled as elastic-plastic pressure-sensitive materials and the rubbers are modeled as nonlinearly elastic materials.
First, the growth of a spherical void in an infinite plastic matrix is investigated under remote radial traction conditions.
The results show that the cavitation stress of the plastic decreases significantly as the pressure sensitivity increases.
Then, the growth of a spherical void located at the center of a spherical rubber particle in an infinite plastic matrix is
investigated under remote radial traction conditions. The results indicate that without any failure criteria for the rubber,
the cavitation stress does not exist when the void is small and the rubber is characterized by high-order strain energy functions.
However, when a failure criterion for the rubber is considered at a finite stretch ratio, the results show that the cavitation
stress for the plastic with the rubber particle becomes close to that for the plastic without the rubber particle.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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