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采用扫描电子显微镜研究了被镀基体表面的粗糙状况和表面活性剂浓度对Ni P PTFE化学复合镀镀层微结构的影响。前者的影响是 :基体表面的道痕不能被复合镀层所填满 ,在通常情况下镀层的表面形貌会基本上保持基体的表面状况。但当基体表面过度粗糙 ,尤其是当道痕又细又密时 ,会使整个镀层比较疏松并出现较多的空洞。后者的影响是 :在表面活性剂浓度过低时所沉积的镀层中只含很少量的PTFE粒子 ,在其浓度过高时所沉积的镀层中会夹杂许多气泡 ,只有在其浓度合适时才能得到平整的、由致密排布的微胞组成的复合镀层。
The microstructure of the electroless NiP PTFE electroless composite coating was studied by scanning electron microscopy (SEM). The roughness of the substrate and the surfactant concentration were studied. The former has the effect that the track marks on the surface of the substrate can not be filled by the composite coating, and the surface topography of the coating generally maintains the surface condition of the substrate. However, when the substrate surface is too rough, especially when the traces are thin and dense, the entire coating will be loose and more hollow. The latter has the effect that only very small amounts of PTFE particles are deposited in the case of too low a surfactant concentration and that there are many bubbles entrapped in the deposited layer when the concentration is too high and only when the concentration is appropriate In order to get a smooth, dense arrangement of micro-composite coating.