Composite plating technology as a mean of strengthening the surface of the material, due to its coating with high hardness, wear resistance, self-lubricating, corrosion resistance, special decorative appearance and electrical contact, electrocatalysis and other functions and much attention. At present, the preparation method of nano-particle composite coating is mainly composed of composite electroplating, composite electroless plating, composite brush plating and spraying. Depending on the nature of the matrix metal and microparticles, other functional coatings with high hardness, high wear resistance, self-lubricating, heat and corrosion resistance can be obtained.
1. Composite plating nano-SiC concentrated slurry for the high purity dispersion of nano-SiC, deionized water and a small amount of dispersant, non-toxic environmental hazards.
2. Composite nano-Ni-P-TiON concentrated slurry for the high purity dispersion of nano-TiON, deionized water and a small amount of dispersant, non-toxic environmental hazards.
The addition of nano SiC in the coating can significantly improve the microhardness of the coating. The results of Ni-based SiC nanocomposite coatings prepared on A3 steel plate show that the SiC particles are evenly distributed in the coating. The hardness of SiC nanocrystalline coating is three times that of pure nickel coating. The results show that the coating has the hardness of 897HV, which is four times that of pure nickel coating. The corrosion resistance is more than three times that of pure nickel coating. Small particles, smooth surface, smooth, and the organization is uniform, dense, nano-SiC particles are well dispersed in the composite coating.
High wear resistance
Coating by adding nano-SiC, etc. can improve the wear resistance of the coating. Nano-SiC composite coating in the friction contact, the protruding SiC as the main sliding surface, first involved in wear and tear, wear off, the matrix began to participate in wear and tear, micropores can also oil, from the lubrication effect. Compared with the addition of liquid or paste lubricant on the friction interface, the composite coating with self-lubricating function has unique advantages under harsh conditions such as high temperature, low temperature, vacuum and strong radiation. It is widely used in dry friction bearings, Ring, bearing cage and so on. The wear resistance of Ni-P nano-SiC coating was found to be less than that of Ni-P alloy coating, and the wear of coating decreased with the increase of nano-powder content. After the heat treatment, the nano-SiC content of 4.0g / L, the wear resistance than the Ni-P alloy coating increased by 4 times.
The corrosion resistance of the Ni-P-TiON concentrates is better than that of the Ni-P alloy coating because the nanoparticles are dispersed in the coating, the nanoparticles are small in size, have grain refinement, and can fill the coating The surface atoms of the nanoparticles are very active and can diffuse with the metal atoms in the coating to form the coordination or chemical bonds to make the bonding force with the coating better, improve the density of the coating, 35um thick Ni-TiON coating neutral salt spray test up to 1000h; thus improving the corrosion resistance of the coating.
How to use:
The slurry will remain soft for a long period of time, but the precipitate does not affect the performance of the slurry. Before use, the slurry is stirred evenly (stirring until no precipitation), followed by ultrasonic dispersion for 20 minutes or sanding for sand for 30 minutes. When the temperature rise to 50-60 ℃, add nano-paste, per liter of chemical plating plus 20 ml of nano-slurry, plating bath per liter plus 30-80 ml (the specific amount of the user to be determined according to the experiment), adjust the PH value To 4.6-5.4 (according to the appropriate adjustment of different plating), stirring evenly, the bath temperature to the working temperature (about 70-80 ℃), 100-200r / min stirring under the plating.
Note: Plating before plating the best sandpaper polished, ethanol bubble for 10 minutes, washed, weak acid soak 1 minute or so, and then pure water, the effect is better.