Room-temperature zinc slag-free phosphating agent and production method

Abstract

The invention provides a room-temperature zinc slag-free phosphating agent and a production method. The phosphating agent comprises the components including, by weight, 15-25 parts of zinc oxide, 45-65 parts of nitric acid, 15-30 parts of phosphoric acid, 0.1-0.4 part of fluorochemical, 0.1-1.5 parts of an accelerant, 5-10 parts of a complexing agent, 0.1-0.5 part of a surfactant, 0.05-0.12 part of an additive and 70-120 parts of water, wherein the fluorochemical is preferably sodium fluoborite, the accelerant is preferably copper nitrate, the complexing agent is preferably ethylene diamine tetraacetic acid, and the surfactant is preferably a compound of a nonionic surfactant and an ampholytic surfactant. The phosphating agent provided by the invention does not use harmful substances suchas nickel-containing compounds, the product stability is uniform, and a generated phosphating film is uniform and compact.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a normal-temperature zinc-based slag-free phosphating agent and a production method. Background technique [0002] The surface of the metal needs to be converted before spraying to form a conversion film. The conversion film has porosity and a certain roughness, which can allow the paint to penetrate into the pores and effectively increase the adhesion of the sprayed coating on the metal surface. , thereby improving the corrosion resistance of the metal and increasing the service life. At present, phosphating technology is often used to chemically treat the surface of metal workpieces to form a phosphate conversion film with a certain thickness on the surface, that is, a phosphating film. [0003] Phosphating agents include a variety of categories, and zinc-based phosphating agents are commonly used. At present, the research on zinc-based phosphating agents at ho...

AI Technical Summary

Problems solved by technology

According to the existing research, in order to promote the phosphating reaction in the phosphating agent, accelerators such as nitrite, chlorate or peroxide are usually selected to be added. On the one hand, these accelerators themselves are toxic and harmful substances, and a small amount of residues not only It affects the properties of the metal surface and is harmful to human health. On the other hand, the compatibility and stability of these accelerators in the system are poor, which affects the stability of the phosphating agent. The resulting phosphating film is prone to thick, pan- Yellow, poor corrosion resistance, etc.