A treatment process and device for aluminum-plastic composite film for anti-hydrofluoric acid corrosion

Abstract

The invention discloses a treating process and a treating device of a hydrofluoric acid corrosion resistant aluminum-plastic composite film. The treating process comprises the following steps: (1) removing oil from the bright surface of aluminum foil; (2) leaching the bright surface of the aluminum foil to remove alkali; (3) performing hydrofluoric acid treatment on the bright surface of the aluminum foil: leaching the bright surface of the aluminum foil with hot hydrofluoric acid water solution, and thus forming an aluminum fluoride salt conversion film under certain etching action generated by the strongly acid solution on the surface of the aluminum foil; (4) dipping with cold water; and (5) bonding the composite film: bonding a polypropylene film and the treated bright surface of the aluminum foil with an adhesive, so as to form a hydrofluoric acid resistant aluminum-plastic composite film. The treating fluid of the treating process of the hydrofluoric acid corrosion resistant aluminum-plastic composite film does not contain hexavalent chromium and has the advantages of environmental friendliness, high film-forming speed, simple process, uniformity of the film, strong corrosion resistance, little environmental pollution and low use cost, and additionally, the hydrofluoric acid resistant performance of aluminum-plastic composite materials can meet the requirements.

Description

technical field [0001] The invention relates to an anti-corrosion treatment technology of an aluminum-plastic composite film, in particular to an anti-hydrofluoric acid corrosion anti-corrosion aluminum-plastic composite film treatment process and device. Background technique [0002] At present, the surface anticorrosion treatment of aluminum alloy generally adopts chromate / oxide type pretreatment liquid, which contains chromic acid solution of fluoride and molybdate accelerator, and forms amorphous conversion film on aluminum alloy. The control of conversion film The amount is around 0.25g / ㎡. Because the conversion coating contains hexavalent chromium compounds, it is a highly toxic substance. Improper handling will not only cause great pollution to the surrounding environment, but also endanger people's health. The industrial application of chromate has been strictly restricted by the governments of various countries, and the replacement process has become the general tr...

AI Technical Summary

Problems solved by technology

resulting in higher production costs for manufacturers

However, domestically produced aluminum-plastic composite materials generally have the disadvantage that the anti-hydrofluoric acid performance does not meet the requirements, which is mainly reflected in the fact that after hydrofluoric acid penetrates cast polypropylene, hydrofluoric acid will corrode the aluminum foil, thereby forming perforations in the aluminum foil. The content volatilizes to the outside of the packaging material, causing the packaging material to lose its protective and barrier functions

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