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High electric insulation sealing method for anodized aluminum film

An anodized aluminum, high temperature sealing technology, applied in electrolytic coatings, surface reaction electrolytic coatings, coatings, etc., can solve the problem of less research and application of insulating aluminum oxide film sealing technology, high production cost, long sealing time, etc. problems, to achieve the effect of excellent sealing effect, short high temperature sealing time and short sealing time

Inactive Publication Date: 2008-10-01
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, boiling water sealing is the most commonly used sealing method. The specific method is to place the oxide film in water at 80-100°C for sealing. The advantage is that the operation is very simple and the adaptability is strong; but this method has the following disadvantages: The hole temperature is high, and the actual operating temperature is above 95°C. At the same time, the sealing time is long, the energy consumption is large, and the production cost is high.
However, the research and application of sealing technology for insulating aluminum oxide film is still very little.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In this embodiment, the sample material is pure aluminum (biling aluminum, aluminum content ≥ 99.7%), the sample is taken from the production line of anodic oxidation insulating film of aluminum wire, and its anodic oxidation electrolyte is a mixed acid solution, the mixed acid The formula of solution is: sulfuric acid 20% (volume ratio), oxalic acid 18g / L, nickel sulfate 8g / L, additive 0.1g / L. The process conditions are: AC oxidation, current density 2.8A / dm 2 , the oxidation time is 30min, the cathode material is lead plate or graphite plate, the breakdown voltage of the film layer is required to be ≥500V, and the mass loss per unit area Δm≤9×10-7 g / mm 2 . The size of the cut sample is 100mm×10mm×2mm, and the calculated surface area of ​​the sample is A=2400mm 2 . The aluminum oxide film on the surface of the sample is sealed as follows:

[0028] 1) Preparation of blocking solution

[0029] First, prepare a normal-temperature sealing solution: 3 L of nickel-fluor...

Embodiment 2

[0038] In this embodiment, the sample material is industrial aluminum foil (aluminum content is 99.5%), and its anodic oxidation electrolyte is a mixed acid solution, and its formula is: sulfuric acid 20% (volume ratio), oxalic acid 18g / L, nickel sulfate 8g / L , Additive 0.1g / L. The process conditions are: AC oxidation, current density 2.8A / dm 2 , Oxidation time 30min, cathode material cliche or graphite plate. The film breakdown voltage is required to be ≥350V. Mass loss per unit area Δm≤9×10 -7 g / mm 2 . The size of the intercepted sample is 100mm×100mm, and the calculated surface area of ​​the sample is 20000mm 2 . The aluminum oxide film on the surface of the sample is sealed as follows:

[0039] 1) Preparation of blocking solution

[0040] First prepare the normal temperature sealing solution: the sealing solution contains 6.5g of nickel acetate per liter, sodium fluoride: 1.5g, isoamyl alcohol: 4g, octylphenol polyoxyethylene ether: 0.3g, and prepare the nickel-flu...

Embodiment 3

[0049] In this embodiment, the sample material is pure aluminum (biling aluminum, aluminum content ≥ 99.7%), the sample is taken from the production line of anodic oxidation insulating film of aluminum wire, and its anodic oxidation electrolyte is a mixed acid solution, the mixed acid The formula of solution is: sulfuric acid 20% (volume ratio), oxalic acid 18g / L, nickel sulfate 8g / L, additive 0.1g / L, current density 2.8A / dm 2 . The process conditions are: alternating current oxidation, oxidation time 30min, the cathode material is lead plate or graphite plate, the breakdown voltage of the film layer is required to be ≥500V, and the mass loss per unit area Δm≤9×10 -7 g / mm 2 . The size of the intercepted sample is 100mm×160mm×2mm, and the calculated surface area of ​​the sample is A=3600mm 2 . The aluminum oxide film on the surface of the sample is sealed as follows:

[0050] 1) Preparation of blocking solution

[0051] First prepare the normal temperature sealing solutio...

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Abstract

The invention relates to a a high electric insulation sealing method for anode oxide aluminum film, which includes [the] steps: the preparation of a sealing liquid, which includes the preparations of a normal-temperature nickel fluoride system sealing liquid and a high-temperature sealing liquid; normal-temperature sealing process, which is to put[puts] an anodized aluminum material into the normal-temperature sealing liquid for 10-15 minutes; a high-temperature process, which puts the aluminum material processed by the normal-temperature sealing liquid into the high-temperature sealing liquid for 3-5 minutes; and drying process, which gets the aluminum material out from the sealing liquid for natural drying. The invention has the advantages that compounds produced by the normal-temperature sealing and high-temperature sealing seal the micro-porous of the oxide film, especially the volume of the Al2O3.3H2O produced by the high temperature sealing increases enormously, the situation that the Ni(OH)2 becomes more and more porous with the increase of in the amount of sediment at room temperature is eliminated, and the invention has excellent sealing effect, stable film quality, good toughness, smooth surface of the film after sealed, high breakdown voltage, and good insulation. The total sealing time is short, the method not only improves productivity, but also saves energy and reduces cost.

Description

technical field [0001] The invention relates to a method for metal surface treatment, in particular to a method for sealing an anodized aluminum film with high electrical insulation. Background technique [0002] Aluminum is a very active metal, aluminum and its alloys naturally form a layer of Al in the air 2 o 3 ·H 2 O or Al 2 o 3 The oxide film can protect the aluminum matrix from being further corroded in neutral and weakly acidic solutions, and plays a certain protective role. But for a slightly harsh environment, this naturally formed film in the air is not enough to really protect the aluminum substrate. With the continuous improvement and development of the aluminum product industry, people began to use various methods to meet the technical requirements, and anodic oxidation is the most commonly used one. The anodized film not only has good mechanical properties and high corrosion resistance, but also has strong adsorption. After being treated with various colo...

Claims

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Application Information

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IPC IPC(8): C25D11/24
Inventor 纪嘉明吴晶刘囝
Owner JIANGSU UNIV
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