Aluminum profile rare earth silane treatment liquid good in thermal stability and preparation method thereof

Abstract

The invention discloses aluminum profile rare earth silane treatment liquid good in thermal stability. The aluminum profile rare earth silane treatment liquid is prepared from, by weight, 120-130 parts of CeC137H2O, 180-190 parts of H2O2, 1.1-1.3 parts of nanometer montmorillonite, 2-2.3 parts of cellulose nanocrystals, 2.3-2.5 parts of lanthanum laurate, an appropriate amount of deionized water, 1-1.2 parts of tetraethyl orthosilicate, 5-5.2 parts of methyl triethoxysilane, 50-53 parts of ethyl alcohol, 10-11 parts of ammonia water, 15-15.6 parts of fluorine and silicon containing polyacrylate emulsion and 2-2.5 parts of nanometer zirconium dioxide. Through using fluorine and silicon containing polyacrylate emulsion and nanometer zirconium dioxide, emulsion is prepared, the treatment liquid is good in film-forming performance, micropores and cracks on the surface of a film are obviously reduced, certain hydrophobic performance is achieved, and the corrosion speed is decreased. Through using nanometer montmorillonite, cellulose nanocrystals and lanthanum laurate, the film-forming performance, thermal stability and compactness of a film layer are improved.

Description

technical field [0001] The invention relates to the technical field of chromium-free metal surface treatment agents, in particular to a rare-earth silane treatment solution for aluminum profiles with good thermal stability and a preparation method thereof. Background technique [0002] Rare earth conversion coatings and silane conversion coatings on aluminum surfaces have been widely concerned as a new generation of metal surface treatment technologies and are expected to replace chromate conversion coatings. As a corrosion inhibitor, the rare earth conversion coating has high bonding strength and good durability, but it is easy to dehydrate and cause cracks, which seriously affects the corrosion resistance. The silane conversion coating has a super-hydrophobic property, is uniform and dense, and can effectively prevent the medium from invading and corroding the substrate. However, the durability of this film layer is poor, and the corrosion resistance will quickly fail once...

AI Technical Summary

Problems solved by technology

[0003] However, the strength, wear resistance, compactness, and corrosion resistance of the rare earth silane composite film are not enough, and the performance of the chromate conversion film has not been reached, so it needs to be improved.