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.