Nickel-free hole sealing agent for easy-to-film antibacterial aluminum alloy anodic oxide film and preparation method thereof

Abstract

The invention discloses a nickel-free hole sealing agent for an easy-to-film antibacterial aluminum alloy anodic 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, an appropriate amount of deionized water, 0.6-0.7 part of triethanolamine dilaurate, 0.3-0.4 part of cobalt lactate, 0.3-0.4 part of sodium tripolyphosphate, 0.8-1 part of silica sol, 0.4-0.5 part of lithium metasilicate, 2.6-2.8 parts of dodecafluoroheptyl-propyl-trimethoxysilane, 1-1.2 parts of tetrabutyl titanate, 45-48 parts of ethyl alcohol, 8.6-9 parts of ammonia water and 0.3-0.4 part of fluorine-containing surfactant. According to the nickel-free hole sealing agent, the triethanolamine dilaurate, the cobalt lactate, the sodium tripolyphosphate and the silica sol are used, so that the film-forming property of the sealing agent is improved, films can be formed quickly, and the sealing agent can be permeated in the films; the hole sealing speed is high, and the air isolation effect is good; besides, the antibacterial effect is achieved, and the corrosion resistance is improved.

Description

technical field [0001] The invention relates to the technical field of nickel-free sealing agent for aluminum alloy anodic oxidation film, in particular to a nickel-free sealing agent for easy film-forming antibacterial aluminum alloy anodic oxidation film 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 t...

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