One-step oil and rust removal phosphatization liquid for steel workpieces

Abstract

The invention discloses a one-step oil and rust removal phosphatization liquid for steel workpieces. The phosphatization liquid comprises 165-175g / L of 85% phosphoric acid, 22-28g / L of nickel dihydrogen phosphate, 14-18g / L of zinc dihydrogen phosphate, 6-8g / L of cobalt dihydrogen phosphate, 6-8g / L of sodium chlorate, 2-4g / L of sodium m-nitrobenzene sulfonate, 2-4g / L of potassium ferrocyanide, 1-3g / L of ammonium molybdate, 2-4g / L of thiourea, 11-15g / L of tartaric acid, 6-10g / L of OP-10, and the balance of water.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to a one-step degreasing and derusting phosphating solution for iron and steel workpieces. Background technique [0002] After the chemical reaction between the metal and phosphoric acid or phosphate, a stable phosphating film with a thickness of several microns can be formed on the metal surface, and the phosphating film provides protection for the metal substrate, that is, improving the corrosion resistance and wear resistance of the metal. Moreover, the phosphating film can also withstand short-term high-temperature baking above 400 °C, and can ideally improve the adhesion of the metal surface coating layer, and play the role of anti-friction and lubrication in the metal cold processing process. [0003] Publication number CN1283710A discloses a kind of "phosphating solution and phosphating process for steel cold deformation processing", publication number CN1115794A di...

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Problems solved by technology

[0006] Publication number CN85100689A "a kind of derusting phosphating solution", CN1030947A "degreasing and derusting phosphating solution", CN1038470A "iron and steel surface treatment agent-a new type of derusting and antirusting agent" are all composed of phosphoric acid, trisodium phosphate, chromic acid, surface Activator, etc. This kind of phosphating solution has the advantages of rust removal, oil removal and rust removal or rust removal and anti-rust. The phosphating of iron and steel workpieces is treated at 30-65°C. Dry in air and continue natural phosphating. Although this phosphating solution solves the problem of reducing residues, the phosphating treatment of steel workpieces before coating still needs to be heated, and after natural air-dry phosphating, the phosphating film takes a long time to form. In the case of high ambient humidity, iron and steel workpieces are prone to yellowing and rusting problems. During the phosphating process of iron and steel workpieces, the composition of the phosphating solution changes greatly, and it is difficult to maintain the concentration of the phosphating solution components