6-series aluminum alloy surface insulation oxidation method

Abstract

The invention belongs to the technical field of metal surface treatment, and relates to a 6-series aluminum alloy surface insulation oxidation method. The 6-series aluminum alloy surface insulation oxidation method comprises the steps of deoiling, alkali corrosion, dusting, anodizing and hole sealing, wherein the anodizing technique is characterized in that a dusted aluminum alloy section is placed in an electrolytic cell containing 160-220 g / L sulfuric acid electrolyte for electrolysis; the density of current is 1.3-2.0 A / dm<2>; the electrolysis oxidation time is 20-50 min; the electrolysis temperature is 18-22 DEG C; the hole sealing technique is characterized in that the anodized aluminum alloy section is soaked in a sealing agent mixed solution of which the PH value is 5.5-6.0 for sealing treatment for 8-30 min; moisture on the surface of the section is drained off; the main solution of the sealing agent mixed solution is 1-10 g / L nickel fluoride, 0.1-5 g / L benzene sulfonic acid and 0.1-5 g / L EDTA disodium; the sub solution is glacial acetic acid and ammonia water which are used for adjusting the PH value of the sealing agent mixed solution; electric insulated shoes made of the aluminum alloy section oxidation film which is sealed with the sealing agent mixed solution are greatly improved; and the insulation breakdown voltage is far higher than that of a sulfuric acid anodizing film layer manufactured in a traditional technique.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and relates to a method for insulating and oxidizing the surface of a 6-series aluminum alloy. Background technique [0002] As "energy saving and environmental protection" has become a topic of increasing concern, lightweight is also widely used in automobiles, machinery, rail transit and other fields. Aluminum alloy has become the material of choice for lightweight due to its low density, light weight, and good mechanical properties. In the power system, in order to ensure the safe and stable operation of the system, the relevant aluminum alloy parts need to meet certain electrical insulation requirements to prevent local overheating and ablation caused by partial discharge, which may cause electrical failure. [0003] Anodizing of aluminum alloy is an electrolytic oxidation process, which forms a layer of oxide film on the surface of aluminum alloy. The film layer has certain ...

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Problems solved by technology

[0004] In view of this, in order to solve the problem that the surface insulation effect of the processed 6-series aluminum alloy profiles in the prior art cannot meet the production requirements, the present invention provides a method for insulating and oxidizing the surface of the 6-series aluminum alloy