Multi-functional metal surface pretreatment solution and preparation method thereof

Abstract

The invention relates to a multi-functional metal surface pretreatment solution and a preparation method thereof. The multi-functional metal surface pretreatment solution is mainly prepared from the following components by weight percent: 0.2-0.6% of zinc oxide, 10-30% of phosphoric acid, 0.2-1.5% of fatty alcohol-polyoxyethylene ether, 0.5-2% of quaternary ammonium salt, 0.5-2% of hydrogen peroxide, 2-6% of hydroxymethyl imidazoline, 2-3% of ethylene glycol, 8-15% of tartaric acid, 1-3% of sodium tripolyphosphate, 0.1-0.3% of RH promoter and 0.1-0.5% of benzotriazole. The method comprises the following steps: mixing zinc oxide and water to obtain paste, adding partial phosphoric acid to stir and obtain a solution A; 2) adding water, fatty alcohol-polyoxyethylene ether, quaternary ammonium salt, hydrogen peroxide, hydroxymethyl imidazoline, ethylene glycol, solution A and other substances in a reaction tank in turn; and 3) stirring for 1.5-3.0 hours at the room temperature to obtain transparent finished product which is not agglomerated. The multi-functional metal surface pretreatment solution can be recycled, have no pollution and on emission, save energy, protect the environment and have lower cost.

Description

technical field

[0001] The invention belongs to the field of chemical industry, and relates to a multifunctional metal surface pretreatment liquid and a preparation method thereof. Background technique

[0002] Anti-corrosion of metal materials is a worldwide problem. The annual loss due to corrosion is the sum of all natural disasters, and the failure and disaster of engineering structures caused by corrosion are even more difficult to estimate. Therefore, anti-corrosion treatment of metal materials and components is not only urgent, but also quite voluminous. The traditional metal surface treatment is basically divided into pickling, passivation, phosphating and other process steps, which cannot be completed at one time; moreover, the entire process is inseparable from hydrochloric acid, sulfuric acid, and nitric acid treatment, which is harmful to operators; and The treated sewage contains a lot of toxic substances. If it is not treated, the pollution to the environment ...