Method for improving performance of silane film on surface of aluminum alloy

Abstract

The invention discloses a method for improving the performance of a silane film on the surface of an aluminum alloy, which comprises the following steps: putting the polished aluminum alloy raw material into a cleaning solution to clean it; After mixing the ionic water and sodium methacrylate sulfonate, stir for 6-10 minutes, the preparation of the film-forming solution is completed, and then the mixed solution is placed in a non-ventilated place for hydrolysis, and the hydrolysis time is 3-5 hours; put the aluminum alloy material into In the prepared film-forming solution, after 2-5 minutes, add diisooctyl phosphate of 0.03-0.05 times the weight of the film-forming solution to the film-forming solution, continue to soak, take out the aluminum alloy material, and place it in a ventilated place for static Set to make a finished product. In the present invention, the silane film prepared on the surface of the aluminum alloy has strong adhesion, good wear resistance, and good corrosion resistance, and the uniformity and density of the film are good, which can effectively prevent aluminum alloy products from being The membrane at the middle surface is mechanically damaged.

Description

technical field [0001] The invention belongs to the field of aluminum alloy processing, and in particular relates to a method for improving the performance of a silane film on the surface of an aluminum alloy. Background technique [0002] Aluminum is one of the most widely used non-ferrous metal materials. However, due to the shortcomings of aluminum's low standard electrode potential, active chemical properties, poor hardness, poor wear resistance, and poor corrosion resistance in corrosive media, the scope of application of aluminum materials is largely limited and its service life is shortened. Therefore, before use, aluminum products must undergo strict surface treatment before they can be put into use. At present, the relatively safe and environmentally friendly aluminum alloy surface treatment process is silanization treatment technology. [0003] The basic principle of silanization treatment is the reaction of silane with metal surface hydroxide and the polycondens...

AI Technical Summary

Problems solved by technology

However, there are still defects in the silane treatment process of aluminum alloys, which are divided into the following points: (1) Due to the thin film thickness of the silane film, further protective measures are required. The protective performance is not good. Although the silane film is well combined with the aluminum alloy substrate, the protective effect is limited because the silane film layer is thin; (2) The hydrolysis time of silane is longer, and the hydrolysis time of ordinary silane coupling agents is at least 10 hours, the stability of the hydrolyzed solution is poor, and the process deviation is relatively large; (3) the silane film does not have self-healing ability. Once the silane film on the metal surface is mechanically damaged, more serious corrosion will appear on the metal part