Chromium-free passivation is a special surface treatment technology used to increase the corrosion resistance of metal surfaces while reducing pollution to the environment. It is an environmentally friendly technology that replaces the traditional chromic acid passivation process.
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The traditional chromic acid passivation process forms a chromium oxide film on the metal surface, which can provide certain anti-corrosion properties, but the chromic acid and other chemicals used in this process have a certain harm to the environment and human health. Therefore, chromium-free passivation technology is widely developed and applied to replace the traditional chromic acid passivation process.
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Chromium-free passivation technology mainly involves the use of chromium-free chemicals or a variety of synthetic additives to form a protective layer on the metal surface. Common chromium-free passivation methods include zinc calcium series, titanium series, vanadium series and so on. These chromium-free passivators can form an inorganic compound film with good corrosion resistance on the surface of the metal, which can protect the metal from corrosion and oxidation.
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Chromium-free passivation technology has the following advantages: first, it is environmentally friendly, does not contain harmful substances such as chromic acid, and reduces the pollution to the environment; Second, it can provide comparable corrosion resistance with traditional chromic acid passivation, and can meet the needs of metal surface; Third, the process is simple and easy, does not require complex equipment and operating steps, and can reduce production costs.
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Therefore, chromium-free passivation technology is widely used in the field of surface treatment of metal products, especially in the automotive, electronics, machinery, aerospace and other industries, and plays an important role in the anti-corrosion and protection of metal products.
Chromium-free passivation is a method of treating aluminum and alloy aluminum and galvanized products with corrosion and oxidation resistance.
Free of chromium and chromium ions, it can convert trivalent chromium ions into hexavalent chromium ions. Chromium-free passivator is a chromium-free product, which is specially used to treat aluminum and alloy aluminum and galvanized products with corrosion and oxidation resistance. It can handle aluminum, aluminum alloy, galvanized sheet and other materials at the same time, and the relevant coating properties have met customer requirements after testing.