A kind of low temperature on-line electrolytic phosphating solution

Abstract

The invention discloses a low-temperature on-line electrolytic phosphating solution. The low-temperature on-line electrolytic phosphating solution is a mixed solution composed of zinc oxide, phosphoric acid, nitric acid, nickel nitrate, citric acid and water, and per litre of the low-temperature on-line electrolytic phosphating solution comprises the components with the following contents: 75-115g of zinc oxide, 130-200g of phosphoric acid, 100-150g of nitric acid, 1.5-3g of nickel nitrate, 0.1-3g of citric acid and the balance water. The low-temperature on-line electrolytic phosphating solution disclosed by the invention is rapid in film formation, and capable of rapidly forming a compact and uniform phosphated film coating on a metal surface; and the coating is high in adhesion force, anti-tensile, high in corrosion resistance, and capable of remarkably improving the corrosion resistance of metal. In addition, the low-temperature on-line electrolytic phosphating solution disclosed by the invention is high in stability, short in phosphating time, low in treatment temperature, without the need of any heating equipment, and low in energy consumption; and moreover, the phosphated residue generated during a treatment process is extremely less, so that pollution to environment is reduced. The low-temperature on-line electrolytic phosphating solution belongs to an environment-friendly phosphating solution.

Description

technical field [0001] The invention relates to a metal cold working pretreatment agent, in particular to a low-temperature online electrolytic phosphating solution. Background technique [0002] Phosphating is a process in which chemical and electrochemical reactions form a phosphate chemical conversion film, and the formed phosphate conversion film is called a phosphating film. Phosphating is a commonly used pre-treatment technology, which should belong to chemical conversion film treatment in principle; the main purpose of phosphating is to provide protection for the base metal and prevent the metal from being corroded to a certain extent; it is used as a primer before painting to improve the quality of the paint. The adhesion and anti-corrosion ability of the film layer; and in the metal cold working process, it can obviously improve the surface friction performance of the workpiece and improve the cold working performance of the material. [0003] The traditional phosp...

AI Technical Summary

Problems solved by technology

In order to meet the requirements of resource conservation and environmental protection, phosphating technology is developing towards low-temperature phosphating. Accelerators such as ammonia compounds, these accelerators are not only expensive, but also will decompose and produce toxic substances during phosphating treatment, which will cause great harm to the operators

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