Process for treating or pre-treating parts, profiles, strips, sheets and/or wires having metallic surfaces comprises using an aqueous acidic solution containing fluoride, zinc and phosphate

摘要

Process for treating or pre-treating parts, profiles, strips, sheets and/or wires having metallic surfaces comprises using an acid aqueous solution containing fluoride, zinc and phosphate with 0.04 to less than 2 g/l sodium, 0.025-2.5 g/l potassium, 0.025-2.5 g/l sodium and potassium, 0.2-4 g/l zinc, 4-65 g/l phosphate, 0.33-0.5 g/l free fluoride, 0.1-5 g/l total fluoride and optionally at least 0.2 g/l nitrate in the phosphatizing solution: