FIELD: treatment of anode-oxide films on aluminium and its alloys. SUBSTANCE: solution for tightening of anode-oxide film on aluminium and its alloys contains, g/l: nickel sulfate 1-3; cobalt sulfate 1-3; acid ammonium fluoride 1-3, tap water up to 1 liter at pH 5-7. EFFECT: higher efficiency. 2 tbl
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