Middle temperature sealant and closing process for aluminum anodized film

Abstract

The invention discloses a mesophilic sealing agent and a sealing technique of aluminum anodic oxide films and belongs to the technical field of the post sealing processing of the anodic oxide films of aluminum and aluminum alloys. The sealing agent of the invention is an aqueous solution that consists of alkali metals or salts of alkali earth metals, a complexing agent and a pH buffering agent; wherein, the concentration of the alkali metals or the salts of alkali earth metals is 5 to 15 g / L, the concentration of the complexing agent is 10 to 20 g / L,, the concentration of the pH buffering agent is 0 to 10 g / L, and the residual quantity is water; the pH value of the aqueous solution of the sealing agent is maintained between 5 and 6, the aluminum anodic oxide film is sealing processed by the sealing agent, the temperature of the aqueous solution of the sealing agent is 75 to 90 DEG C, and the soaking and sealing time lasts for 20 to 30 minutes. The sealing agent adopts the alkali earth metals or the salts of alkali metals with wide resource and low cost so as to replace heavy metal nickel salts or cobalt salts in the prior art and adopts the organic complexing agent that has biodegradability, low price and simple molecules so as to replace surface activating agents that contain giant molecules and benzene rings in the prior art, and consequently the aluminum anodic oxide film that is sealing processed by the sealing agent obtains excellent anti-pruina property, and the anti-corrosion and anti-pollution properties of the anodic oxide film of aluminum and aluminum alloys are generally improved.

Description

technical field [0001] The invention relates to a medium-temperature sealing agent and a sealing process for aluminum anodic oxidation films, belonging to the technical field of post-sealing treatment of aluminum and aluminum alloy anodic oxidation films, and has nothing to do with the sealing technology of aluminum hard anodic oxidation films or non-electrolytic chemical conversion films. technical background [0002] Aluminum and aluminum alloys are one of the most commonly used metals in today's industry. Aluminum and aluminum alloys are not only light in weight and strong in texture, but also have good ductility, electrical conductivity, thermal conductivity, heat resistance and nuclear radiation resistance. An important basic raw material for economic development. [0003] Aluminum and aluminum alloys are stable in dry atmospheres, but are easily corroded in humid atmospheres, especially salty air. Anodic oxidation is widely used in industry to form an oxide film on th...

AI Technical Summary

Problems solved by technology

[0009] Both of the above two patents use surfactants with macromolecules and benzene rings. This type of organic compound degrades slowly in nature, and it is easy to accumulate in the environment after long-term use, causing damage to the ecology.