Nano-Al₂O₃ Dispersion Research In Ni-P-Al₂O₃ Composite Plating Bath

The electroless composite plating has already got extensive application with advantage of low costs, simple craft. the symmetrical thickness of coating and even can plate largely etc. Because of the added solid particles most are micron rank, its performance can not satisfy the request of the high speed of developing of science and technology, the range of application to be limited. In recent years, along with the development of manometer material and technology, it is raising the upsurge of researching the craft of electroless composite plating with manometer particles in domestic and foreign. As we know, the performances of composite coating with manometer particles are better than the composite coating with micron particles, but the manometer material because its big relative surface proportion, the increase of superfcial atomicity, insuffcient of atomic coordinate, and the high surface energy, make these superficial atoms to have the higher activeness, they are extremely unstable and very easy to reunite with each other and become the big reunion body with some connection interphases. Therefore, in order to make the manometer particles suspend evenly in the bath to obtain the composite coating of symmetrical distribution of manometer particles, the question of disperse of manometer particles appears important especially. So we studied systemically to the dispersing of manometer particles with surfactant and ultrasonic; study systemically to the mixed of surfactant, study the influence of the different disperser methods to the organization structure of coating with the scanning electron microscope. In this paper, to the bath by adding different surfactants Ways to nano-alumina particles dispersed in the coating by scanning electron microscopy of the dispersion of nano-alumina; systematic study of small molecule surfactants, polymer surfactants agents, combination of living on the surface of nano-alumina dispersion; using ultrasonic dispersion method of nano-alumina powder dispersion studies; measured using the method of coating hardness of nano-alumina content and the relationship between coating hardness; Ni-P-Al₂O₃ composite electroless plating of nano-alumina to study the mechanism of the deposition, Ni-P-Al₂O₃ composite electroless plating of alumina is dependent on electric force realize strong adsorption, Ni-P-Al₂O₃ composite electroless plating China; in the bath by adding varying amount of nano-alumina content of alumina coating changes the relationship between the two parabolic type; with a basal surface of composite electroless plating process, because it is relying on the model of surface deposition deposition of metals, making matrix metalloproteinase can capture large particles. experimental results show that, composite electroless plating of alumina is dependent on electric field strength to achieve strong adsorption, Ni-P-Al₂O₃ in composite electroless plating; in the bath by adding varying amount of alumina in the alumina content of coating-induced changes in the relationship between the two parabolic type; with a basal surface of composite electroless plating process, as a result of relying on surface deposition model of sedimentary metals, makes matrix metalloproteinase can capture large particles.