Aluminum alloy anode oxide film nickel-free hole sealing agent and preparing method thereof

Abstract

The invention discloses an aluminum alloy anode oxide film nickel-free hole sealing agent. The 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, 0.1-0.2 part of borax, 0.2-0.3 part of nanometer crystalline cellulose, 0.6-0.7 part of nanometer aluminum oxide, 0.4-0.5 part of lithium metasilicate, 2.6-2.8 parts of dodecafluoroheptylpropyltrimethoxysilane, 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. Tetrabutyl titanate is used for forming nanometer titanium dioxide, lithium metasilicate, dodecafluoroheptylpropyltrimethoxysilane and fluorine-containing surfactant are used at the same time, and by means of reaction, permeability, cohesiveness and hydrophobicity of the hole sealing agent can be improved; by using borax, nanometer crystalline cellulose and nanometer aluminum oxide, lubricity and wear resistance of an oxidation film are improved.

Description

technical field [0001] The invention relates to the technical field of a nickel-free sealing agent for anodized aluminum alloy films, in particular to a nickel-free sealing agent for 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, and its dissolution rate is ...

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