Novel treatment fluid for chromium-free passivation of aluminum alloy

Abstract

The invention relates to treatment fluid for surface passivation of an aluminum alloy, and particularly discloses novel treatment fluid for chromium-free passivation of the aluminum alloy. The novel treatment fluid consists of the following substances in percentage by mass: 20 to 30 percent of a mixture of potassium titanate, sodium titanate and magnesium titanate salts, 5 to 15 percent of a mixture of potassium zirconate, sodium zirconate and magnesium zirconate salts, 5 to 15 percent of modified organic silicon resin, and 40 to 50 percent of urethane resin. The novel treatment fluid for the chromium-free passivation of the aluminum alloy is specifically used for surface treatment of aluminum and alloys thereof, and magnesium and alloys thereof, and not only can improve the corrosion resistance per se of a material, but also can enhance the adhesive force of the material and a coating layer thereof. The treatment fluid has the advantages of simple using process, low cost, no pollution and the like.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a treatment liquid for passivating the surface of aluminum alloys. Background technique [0002] Aluminum surface treatment is a professional technology involving many fields, including automobiles, motorcycles, aerospace, household appliances, electronics, building materials, and general metal processing. Among them, chemical conversion coating is the most commonly used technical means in aluminum surface treatment. The chemical conversion coating has a certain corrosion resistance and good physical adsorption capacity, which can greatly improve the bonding force between the aluminum substrate and the coating, and enhance the corrosion resistance of aluminum products. Its processing speed is fast, it does not consume electric energy, and the required equipment is simple. , Low processing cost. At present, there are three common methods of chemical conversion fi...

AI Technical Summary

Problems solved by technology

The conversion coating on the surface of aluminum or aluminum alloy treated in this way does not contain chromium and will not cause harm to the human body and the environment, but the corrosion resistance of the film is poor

[0006] The traditional aluminum alloy passivation process generally includes 8 steps including cleaning, water cleaning, chromization, water cleaning, deionized water cleaning, water treatment, heavy metal sediment cleaning and heavy metal slag transportation. The traditional process is complex and the process The chromium-containing compounds used in the process will not only cause harm to the human body and the environment, but also remain in the treatment tank and cannot be discharged directly. It requires a professional company to clean and transport, and the cost is high