FIELD: protective coatings.
SUBSTANCE: aluminum alloy sheet is preliminarily treated in first container with aqueous solution containing organ phosphorus compound, preferably vinylphosphonic acid/acrylic acid copolymer, and metal ions, after which polymer coating is applied. Preliminary-treatment solution is then transferred into second container wherein it is restored by way of removing aluminum with the aid of cation-exchange resin preferable containing styrene/divinylbenzene copolymer functionalized by sulfonate groups, whereupon thus treated solution is returned into first container.
EFFECT: increased preliminary treatment efficiency and reduced expenses.
10 cl, 1 dwg, 1 tbl
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