Environment-friendly fluorine-free aluminum alloy surface treating agent

Abstract

The invention discloses an environment-friendly fluorine-free aluminum alloy surface treating agent. The surface treating agent is composed of the following raw materials in parts by weight: 2.3 to 3 parts of sodium borate, 1 to 1.7 parts of zinc acetate, 0.1 to 0.2 part of calcined gypsum powder, 0.8 to 1 part of glucolactone, 0.03 to 0.1 part of resorcinol monobenzoate, 0.1 to 0.3 part of N,N-diethylaniline, 1 to 2.4 parts of sodium methylenebisnaphthalenesulphonate, 2 to 3 part of polyethylene glycol 400, 0.8 to 1 part of potassium tungstate, 2 to 2.6 parts of myristyl binary acid, 2 to 3 parts of film-forming auxiliary agent, 14 to 20 parts of silane coupling agent KH570, and 130 to 150 parts of deionized water. The surface treating agent can form a layer of conversion membrane on the aluminum alloy surface, and the conversion film has the advantages of compactness, uniformity, corrosion resistance, acid and alkali resistance, strong salt fog resistant performance, and very good coating adhesivity. Moreover the processing method is simple, the requirement on temperature is low, and the energy consumption is low.

Description

[0001] technical field [0002] The invention mainly relates to the field of surface treatment, in particular to an environment-friendly fluorine-free aluminum alloy surface treatment agent. 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 the anodic oxidation method, which forms a conversion film on the surface of the aluminum alloy by an electrochemical method. Although this method can improve the environmental protection and fluorine-free performance of the aluminum alloy, its ability to adapt to the environment is poor, and the conversion film layer is not uniform enough. 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 zinc...

AI Technical Summary

Problems solved by technology

The commonly used method is the anodic oxidation method, which forms a conversion film on the surface of the aluminum alloy by an electrochemical method. Although this method can improve the environmental protection and fluorine-free performance of the aluminum alloy, its ability to adapt to the environment is poor, and the conversion film layer is not uniform enough. 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 zinc, manganese, nickel, chromium and other heavy metals Ion and sub-environmental protection, fluorine-free and other carcinogens are very serious to the environment. The metal surface silanization treatment technology is considered to be expected to replace the phosphate conversion treatment because it does not involve substances harmful to the environment, the production process has low energy consumption, and the technology has a wide range of applications. And chromate passivation treatment is the latest development direction of metal surface protection alone