In the electrolyte solution by electrochemical deposition of metal and metal particles co-deposition process to obtain the composite material layer called composite plating, the resulting composite material layer is called composite coating or dispersed coating, sometimes called cermet.
Composite coating by application can be divided into: wear-resistant composite coating, self-lubricating composite coating, dispersion strengthened alloy composite coating, electric contact with composite coating, corrosion resistant composite coating, decorative composite coating six categories.
In composite plating, the performance of the composite coating depends mainly on the matrix metal and solid particles, should be based on the use of coatings and performance requirements.
The composite electroplating solution also has an important effect on the composite layer. For the same matrix metal and solid particles, the selection of different plating solutions also produces very significant differences. For example, copper and aluminum oxide particles can scarcely be found in acidic copper sulfate solutions Co-deposition, but in cyanide copper plating solution is very easy to co-deposition.
In addition, the solid particles suspended in the bath evenly, but also a necessary condition for composite coating, mixing is the most commonly used method, which includes mechanical agitation method, bath circulation method, gas-liquid method, the plate pump method and high recoil Law and so on.
In addition to the above effects on the composite coating, the loading of solid particles in the bath, additives, current density temperature, PH value and so on the co-deposition of particles and metals have an impact, other factors such as current waveform, ultrasonic, magnetic field Etc. The co-deposition of particles and metals also has a certain impact.
Article from NdFeB Industry Network