Nickel-free hole sealing agent for improving compactness of aluminum alloy anode oxide film and preparation method of nickel-free hole sealing agent

Abstract

The invention provides a nickel-free hole sealing agent for improving the compactness of an aluminum alloy anode oxide film. The nickel-free hole sealing agent is prepared from, by weight, 8-8.5 parts of magnesium acetate, 19-20 parts of triethanolamine, 3-3.2 parts of ammonium acetate, a proper amount of deionized water, 0.2-0.4 part of zirconium oxychloride, 1.1-1.2 parts of lithium stannate, 0.3-0.4 part of vitamin E, 0.4-0.5 part of titanyl sulfate, 0.4-0.5 part of lithium silicate, 2.6-2.8 parts of lauryl fluorine heptyl propyl trimethoxysilane, 1-1.2 parts of tetrabutyl titanate, 45-48 parts of ethyl alcohol, 8.6-9 parts of ammonium hydroxide and 0.3-0.4 part of fluorine-containing surfactant. Due to the fact that zirconium oxychloride, lithium stannate, vitamin E and titanyl sulfate are adopted, the nickel-free hole sealing agent can permeate to the bottom of a gap, the reaction rate is even, the compactness of the oxide film can be greatly improved, and corrosion resistance is greatly improved.

Description

technical field [0001] The invention relates to the technical field of a nickel-free sealing agent for aluminum alloy anodized films, in particular to a nickel-free sealing agent for improving the compactness of anodized aluminum alloy films and a preparation method thereof. Background technique [0002] At present, aluminum and its alloys generally use anodic oxidation surface protection technology to form a certain thickness of oxide film on the surface of aluminum and its alloys. Since there are a large number of micropores on the surface of the oxide film, appropriate sealing treatment must be carried out. The common sealing methods are mainly Boiling water (or steam) sealing, nickel salt sealing, polymer resin sealing. The boiling water (or steam) sealing method has high energy consumption and cannot meet the requirements for higher corrosion resistance; the commonly used nickel salt sealing agent contains Ni 2+ , F － It is toxic to the human body and the environment,...

AI Technical Summary

Problems solved by technology

But this process still has shortcomings, anti-SO 4 2- The interference is poor, and the permeability is not good, the gap sealing performance of the bottom layer of the oxide film is not good, and there are also poor performances such as antibacterial, corrosion resistance, heat resistance, salt spray resistance, wear resistance, and oxidation resistance. In addition, the toughness, hardness, and shrinkage of the sealant will also affect the sealability, which needs to be improved