what is Passivation For Galvanized Steel
what is Passivation For Galvanized Steel
Galvanized steel passivator is an important material used to improve the corrosion resistance and aesthetics of galvanized steel. It achieves this by forming a dense protective film on the surface of the galvanized layer. Here are some key information about passivators for galvanized steel:
1. ** Passivation mechanism ** : Galvanized passivation involves the REDOX reaction between the metal zinc coating and the chromic acid in the passivation solution to generate trivalent and hexavalent chromium compounds, which constitute the passivation film and provide protection.
2. ** Self-repair function ** : The color passivation film has the function of self-repair, when the passivation film is damaged, the hexavalent chromium compound is dissolved in water to generate chromic acid, which can form a passivation film with the zinc layer again, so as to repair itself.
3. ** Color and influencing factors ** : The color of the passivation film is affected by the proportion of trivalent chromium and hexavalent chromium content, as well as the length of passivation time and oxidation time in the air, affecting the thickness and color of the film layer.
4. ** Environmental protection issues ** : Traditional passivation treatment uses hexavalent chromate, but due to its toxicity, with the strengthening of environmental awareness, hexavalent chromium passivation is gradually being replaced by chromium-free or low chromium passivation agents.
5. ** Passivation process ** : The passivation process includes cleaning metal parts, soaking in an acid bath to remove surface foreign matter, and forming an oxide layer or film, thereby reducing the possibility of chemical reaction between metal and air.
6. ** Passivation method ** : Passivation can be applied by different methods, such as immersion tank, circulation, spray application and gel application, to adapt to different processing needs.
7. ** Application field ** : Galvanized passivation technology is widely used in automotive, construction, home appliances and other industries to improve the corrosion resistance and service life of metal parts.
8. ** Future development ** : The future development of galvanized passivation technology will focus on improving anti-corrosion performance, reducing costs and promoting environmental protection and energy saving to meet the requirements of green development.
9. ** Supplier Information ** : Disai New Materials is a company that focuses on environmentally friendly new materials and new technologies in the field of metal surface treatment, providing chromium-free passivation agents, hot-dip galvanizing passivation agents and other products.
Through this information, we can see that galvanized steel passivators play an important role in improving metal corrosion resistance, extending service life and meeting environmental requirements. With the development of technology, future passivators will pay more attention to environmental protection and performance improvement.
