Chromium-Free Passivation Agent For Aluminum

Q：The products need to clean the surface oil and dirt before passivation
A：Because the product in the process of machining( wire drawing, polishing, etc.)，some oil and dirt adhere on the products surface. Must clean this smudginess before passivation, because of this smudginess in the product surface will be prevents passivation liquid contact reaction, and will be affect the appearance of the passivation effect and product quality.
Q: The products when to need adopt pickling passivation craft?
A: Products in the process of welding and heat treatment（In order to increase the products hardness , such as the heat treatment process of martensitic stainless steel）.Because of the product surface will form black or yellow oxides on the high temperature condition, This oxides will affect the appearance of the product quality, so must remove the surface oxides.

Q: Electrolytic polishing have what advantages relative to the mechanical polishing,
A: Can be mass production, differ from artificial mechanical polishing, just only polishing one after another. Operating time is short，high production efficiency. The cost is low. After electrolysis, surface dirt easy to cleaning, it’s difference from artificial mechanical polishing, there will be a layer of polishing wax on the product surface, it’s not easy to cleaning. Can be achieve mirror luster effect, and form corrosion resistance passivation membrane. Can effectively improve the anti-rust performance of the product