FIELD: chemical treatment of surfaces; may be used to clean duralumin press mould to remove burst rubber deposit formed during vulcanization of product made of natural and isoprene rubbers. SUBSTANCE: pickling liquor comprises, mas.%: alkali, 10-20; potassium chromate, 8-16; sodium tetraborate, 4-8; water, the balance. When used to pickle press mould made of aluminium alloy corrosion rate of 0.19-0.28 mm/h is observed. EFFECT: higher efficiency. 1 tbl
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