Aluminum alloy anodic oxide film nickel-free sealant for harsh environment and preparation method thereof

Abstract

The invention discloses aluminum alloy anodic oxide film nickel-free sealant for a harsh environment. The aluminum alloy anodic oxide film nickel-free sealant for the harsh environment 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 adequate amount of deionized water, 0.4-0.5 part of vitamin C, 0.4-0.6 part of nano carbon, 0.6-0.7 part of nano-montmorillonite, 0.6-0.8 part of hafnium fluoride acid, 0.4-0.5 part of lithium silicate, 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 aluminum alloy anodic oxide film nickel-free sealant for the harsh environment, by means of utilizing the vitamin C, the nano carbon, the nano-montmorillonite and the hafnium fluoride acid, pores of oxide films can be closed thoroughly, compact oxide films are obtained, corrosion resistance, heat resistance and abrasion resistance of the oxide films are prominent, and the oxide films are suitable for being used for aluminum alloy oxide film surface sealing in the harsh environment.

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 aluminum alloy anodized films used in harsh environments 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, a...

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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