Residue-free normal-temperature deoiling/derusting/phosphating solution

Abstract

The invention discloses a residue-free normal-temperature deoiling / derusting / phosphating solution which is prepared from the following raw materials: 20-25 parts of phosphoric acid, 10-12 parts of hydrochloric acid, 8-10 parts of phosphorous acid, 3-5 parts of citric acid, 3-5 parts of sodium hydroxide, 5-8 parts of cupric hydroxide, 3-5 parts of sodium sulfate, 2-8 parts of dipotassium hydrogen phosphate, 5-10 parts of disodium edetate, 3-5 parts of sodium tripolyphosphate, 10-12 parts of sodium pyrophosphate, 10-18 parts of trichloroacetic acid, 10-15 parts of hypochlorous acid, 8-10 parts of tartaric acid, 5-12 parts of ammonium sulfate, 5-10 parts of ammonium chloride, 5-10 parts of lauryl sodium sulfate, 5-8 parts of alkylphenol polyoxyethylene and 80-100 parts of pure water. The residue-free normal-temperature deoiling / derusting / phosphating solution can implement deoiling, derusting and phosphating techniques at normal temperature, does not generate residues or pollute the environment, has favorable rust-preventing property, and can not easily shed after being applied to the surface of the steel workpiece.

Description

technical field [0001] The invention relates to the technical field of a phosphating solution, in particular to a normal-temperature phosphating solution for removing oil, rust, and slag. Background technique [0002] At present, the phosphating solution of the prior art is basically composed of calcium nitrate, zinc phosphate, chromium nitrate, tin nitrate, citric acid, tartaric acid, EDTA, surfactant and water, etc. It has the advantages of cheap raw materials, easy preparation, and Strong anti-rust ability, etc., but the steel workpiece needs to be heated to 65-70 degrees during the phosphating treatment process before coating, and residues are formed at the same time, and the paint film surface of the steel workpiece after phosphating treatment by this method There will be peeling phenomenon, and there will be certain residues at the same time; adding phosphoric acid, trisodium phosphate and chromic acid to the phosphating solution has the advantages of rust removal, oil...

AI Technical Summary

Problems solved by technology

[0002] At present, the phosphating solution of the prior art is basically composed of calcium nitrate, zinc phosphate, chromium nitrate, tin nitrate, citric acid, tartaric acid, EDTA, surfactant and water, etc., and has the advantages of cheap raw materials, easy preparation and convenient preparation. Strong anti-rust ability and other advantages, but the steel workpiece needs to be heated to 65-70 degrees during the phosphating treatment process before coating, and residues are formed at the same time, and the paint film surface of the steel workpiece after phosphating treatment by this method There will be peeling, and there will be a certain amount of residue; adding phosphoric acid, trisodium phosphate, and chromic acid to the phosphating solution has the advantages of rust removal, oil removal, or rust prevention. , dry in a ventilated place, and continue natural phosphating, which can reduce residues, but it needs to be humidified before phosphating, and it takes a long time to form a phosphating film after natural drying, and it is easy to turn yellow and rust in a humid environment