Diammine silver fluoride modified aluminum alloy anode oxide film nickel-free sealant and preparation method thereof

Abstract

The invention discloses a diammine silver fluoride modified aluminum alloy anode oxide film nickel-free sealant. The sealant 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 defined amount of deionized water, 0.3-0.5 part of sodium oleate, 0.6-0.7 part of salicylic acid, 0.4-0.5 part of polyvinylpyrrolidone, 0.7-0.9 part of diammine silver fluoride, 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 ethanol, 8.6-9 parts of ammonium hydroxide and 0.3-0.4 part of fluorine-containing surfactant. According to the sealant, by using sodium oleate, salicylic acid, polyvinylpyrrolidone and diammine silver fluoride for conducting further modification, the sealant is good in penetrability, high in hole sealing efficiency and good in sealing effect, thereby the acid and alkali resistance of an oxide film are greatly improved, and meanwhile the abrasion 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 anodic oxidation film of aluminum alloy modified by ammonia silver fluoride 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 bod...

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