A kind of aluminum alloy anodized film sealing agent and preparation method thereof

Abstract

The invention discloses a sealant for an aluminum alloy anode oxide film and a preparing method for the sealant. The sealant contains Cu(NH3)4(OH)2 with the cupric ion molar concentration ranging from 0.05 mol / L to 3.0 mol / L, and the sealant further contains celluloses with the weight percentage ranging from 0 to 6%. The preparing method includes the steps that a solution of the Cu(NH3)4(OH)2 with the cupric ion molar concentration ranging from 0.05 mol / L to 3.0 mol / L is firstly prepared, the celluloses with the weight percentage ranging from 0 to 6% is added into the solution, even mixing and stirring are carried out, and the sealant for the aluminum alloy anode oxide film is obtained. The sealant is used for hole sealing of the aluminum alloy anode oxide film, the hole sealing quality completely meets the requirement for being smaller than or equal to 30 mg / dm<2> in the EN12372-7 standard, a product exists in a manner of a complex, the stability is good, and the product completely meets the environmental requirement.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy oxide film sealing agent, in particular to a nickel-free sealing agent. Background technique [0002] Due to the poor corrosion resistance of aluminum alloys, it is often necessary to use anodic oxidation technology to form an anodic oxide film to improve the corrosion resistance of aluminum alloys and meet the applications in more fields. The development process of aluminum alloy anodic oxide film sealing technology is as follows: in the 1930s, chromate or dichromate was used to seal the micropore technology of anodic oxide film, which is still used in some occasions, and high temperature Steam sealing, boiling water sealing and other technologies. In the 1960s, the electrophoretic coating technology of anodic oxide film was developed and applied industrially; after the 1970s, the cold sealing technology developed in Europe with nickel fluoride as the main component is now widely used in ...

AI Technical Summary

Problems solved by technology

[0004] The above various sealing technologies have their own advantages and disadvantages, and it is difficult to realize large-scale industrial production and application at this stage. Therefore, the production of aluminum building profiles in my country basically still uses nickel-fluoride salts at this stage, and this sealing agent contains a large amount of nickel ions. and fluoride will cause great pollution and poison to the environment and operators

The effect of the rare earth sealing method is better, which is equivalent to the dichromate sealing method. However, the rare earth sealing, boiling water sealing, dichromate sealing, and nickel-fluoride salt sealing methods are all susceptible to corrosion. The problem of easy loss of sealing effect in humid environment is difficult to overcome