Generally speaking, some metal workpieces such as zinc alloy, electroplating and other metal workpieces to do painting treatment, generally need to do passivation, passivation of these metal workpieces after the surface corrosion resistance will be better to do painting treatment, but also can effectively improve the adhesion of the paint film.
Author: Anna
Generally speaking, some metal workpieces such as zinc alloy, electroplating and other metal workpieces to do painting treatment, generally need to do passivation, passivation of these metal workpieces after the surface corrosion resistance will be better to do painting treatment, but also can effectively improve the adhesion of the paint film. The current market to do passivation treatment generally use trivalent chromium or chromium-free passivator, what is the difference between the two?
Trivalent chromium
Trivalent chromium is developed on the basis of hexavalent chromium passivation treatment agent, toxicity than hexavalent chromium is smaller, its salt spray time, corrosion resistance is relatively stable and reliable, relatively poor densification of the workpiece passivation effect is also relatively strong, so the current application of a relatively wide range of places, but only for environmental protection is not high.
Chrome-free passivates
Chromium-free passivator is produced under the premise of further environmental protection requirements, but because of chromium-free passivator from the development of the market into the application of the overall time is very short, so his stability, corrosion resistance, salt spray time is not very stable, although the chromium-free passivator is relatively more environmentally friendly, but it is for the densification of relatively poor performance of the workpiece salt spray test can not meet the requirements, so there is a lot of room for development.
Is there a better choice?
High corrosion resistant nanopassivator, which is specially designed for the metal surface layer corrosion resistance, anti-discoloration and the design of the latest products.
It adopts high corrosion resistant nano-passivator with special nano organic-inorganic composite material, which can effectively reduce the porosity, can combine the advantages of both chromium and nano-materials, and make the corrosion resistance and adhesion of metal surface layer more superior through graded passivation.
Compared with trivalent chromium passivate, the corrosion resistance and corrosion resistance performance is better; compared with chromium-free passivate, the performance is more stable.