Surface treating agent for trace rare earth aluminum alloy

Abstract

The invention discloses a surface treating agent for trace rare earth aluminum alloy. The surface treating agent comprises the following raw materials in parts by weight: 1-2 parts of phosphorous acid, 0.01-0.04 part of lanthanum citrate, 0.02-0.03 part of cerium citrate, 1-2 parts of hydrolytic polymaleic anhydride, 2-3.1 parts of pentaerythritol, 2-3 parts of amino trimethylene phosphonic acid, 0.1-0.4 part of melamine, 0.2-0.3 part of aluminum nitride powder, 0.6-1 part of ethylene bis-stearamide, 2-3.5 parts of ethylene glycol, 0.2-0.3 part of tributyl tin chloride, 2-3 parts of a coalescing agent, 10-13 parts of 3-amino propyl trimethoxy silane, 5-8 parts of bis(gamma-triethoxysilyl propyl) tetrasulfide, and 110-140 parts of de-ionized water. The lanthanum citrate and the cerium citrate added in the surface treating agent have good water solubility, so that the compatibility among all the materials is improved, the surface resistance and the weather resistance of a coating film are improved, and the coating film is uniform, smooth and stable.

Description

[0001] technical field [0002] The invention mainly relates to the field of surface treatment, in particular to a surface treatment agent for a trace amount of rare earth aluminum alloy. Background technique [0003] 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 performance of trace rare earth 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 ...

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 performance of trace rare earth 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 although the traditional phosphate conversion and chromate passivation surface treatment technology can obtain good results, the waste liquid discharged during the treatment process contains heavy metal ions such as zinc, manganese, nickel, chromium, etc. Carcinogens such as rare earths and sub-trace rare earths are very serious to the environment, 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