Surface treating agent for starter aluminum alloy casing

Abstract

The invention discloses a surface treating agent for a starter aluminum alloy casing. The surface treating agent is composed of an A component and a B component; wherein the A component is composed of the following raw materials in parts by weight: 2 to 4 parts of tetrahydrofurfuryl alcohol, 1 to 2 parts of ammonium tungstate, 0.9 to 2 parts of tetramethyl ammonium hydroxide, 0.6 to 2 parts of nano silicon dioxide, 1 to 2 parts of sodium sorbate, 0.2 to 0.4 part of 8-hydroxyquinoline, 1 to 2 parts of zinc dihydrogen phosphate, 5 to 8 parts of bis(gamma-triethoxysilylpropyl)tetrasulfide, and 52 to 70 parts of deionized water; and the B component is composed of the following raw materials in parts by weight: 2 to 3 parts of boric acid, 0.1 to 0.2 part of castor oil polyoxyethylene ether, 0.2 to 0.4 part of marble powder, 2 to 4 parts of monopotassium phosphate, 3 to 4 parts of film-forming auxiliary agent, 7 to 12 parts of silane coupling agent KH560, and 70 to 80 parts of deionized water. The surface treating agent can form a uniform membrane on the aluminum alloy surface. The membrane has the advantages of high hardness, smoothness, difficulty in falling off, easiness for brazing, wear resistance, corrosion resistance, and strong environmental adaptability.

Description

[0001] technical field [0002] The invention mainly relates to the field of surface treatment, in particular to a surface treatment agent for an aluminum alloy shell of a starter. 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 electrochemical methods. Although this method can improve the nanometer performance of the 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 technologies can achieve good results, the waste liquid discharged during the treatment process contains heavy metal ions suc...

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 electrochemical methods. Although this method can improve the nanometer performance of the 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 technologies can achieve good results, the waste liquid discharged during the treatment process contains heavy metal ions such as zinc, manganese, nickel, chromium and Sub-nanometer and other carcinogens are very serious to environmental pollution, and the metal surface silanization treatment technology is considered to be expected to replace phosphate conversion treatment and chromate 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. Passivation treatment is the latest development direction of metal surface protection