Surface treating agent for chrome-based aluminum alloy

Abstract

The invention discloses a surface treating agent for a chrome-based aluminum alloy. The surface treating agent comprises the following raw materials in parts by weight: 0.5-1 part of tea saponin, 0.7-2 parts of ethylene distearamide, 1-2 parts of sodium carboxymethylcellulose, 2.5-4 parts of polylactic acid, 1-2 parts of sodium gluconate, 0.1-0.2 part of chromium trioxide, 0.2-0.4 part of potassium chloride, 0.1-0.4 part of 8-hydroxyquinoline, 0.2-0.4 part of dimethylamino propylamine, 5.6-8 parts of isobutanol, 1-2 parts of coalescing agent, 16-20 parts of silane coupling agent KH570, and 100-140 parts of de-ionized water. The surface treating agent has excellent corrosion resistance, chemicals resistance, heat discoloration resistance and weather resistance, is effective for aluminum alloy workpieces without scratches, and can achieve excellent corrosion resisting effect on exposed scratched parts.

Description

technical field [0001] The invention mainly relates to the field of surface treatment, in particular to a chromium-based aluminum alloy surface treatment agent. Background technique [0002] There are many surface treatment methods for aluminum alloys, such as physical methods, chemical methods, physicochemical methods, and comprehensive methods. The commonly used method is anodic oxidation method, which forms a conversion film on the surface of aluminum alloy by electrochemical method. Although this method can improve the corrosion resistance of aluminum alloy, its ability to adapt to the environment is poor, and the conversion film layer is not uniform enough and easy to fall off. , the wear resistance has not been improved, and the traditional phosphate conversion and chromate passivation surface treatment technology can obtain good results, but the waste liquid discharged during the treatment process contains heavy metal ions such as zinc, manganese, nickel, chro...

AI Technical Summary

Problems solved by technology

The commonly used method is anodic oxidation method, which forms a conversion film on the surface of aluminum alloy by electrochemical method. Although this method can improve the corrosion resistance of aluminum alloy, its ability to adapt to the environment is poor, and the conversion film layer is not uniform enough and easy to fall off. , the wear resistance has not been improved, and the traditional phosphate conversion and chromate passivation surface treatment technology can obtain good results, but the waste liquid discharged during the treatment process contains heavy metal ions such as zinc, manganese, nickel, chromium, etc. Carcinogens such as nitrite and nitrite are very serious environmental pollution, and the metal surface silanization treatment technology is considered to be expected to replace phosphate conversion treatment and chromium because it does not involve substances that are harmful to the environment, the production process has low energy consumption, and the technology has a wide range of applications. Salt passivation treatment is the latest development direction of metal surface protection alone