Formation agent and preparation method

Abstract

The invention provides a formation agent. The agent is prepared from specific components as follows: nitric acid with the concentration being 50%, an accelerant, hexafluorozirconic acid, polyethylene glycol in the analytically pure specification, a pH regulator, a bactericide and pure water. The invention further provides a preparation method of the formation agent. According to the formation agent and the preparation method, hexafluorozirconic acid is used as a film-forming agent, harmful metal ions such as zinc, manganese, nickel, phosphorus, chromium and the like are not contained, and the formation agent is high in environmental protection performance, has little damage to human health and has little sediment.

Description

technical field [0001] The invention relates to the field of building metal surface passivation, in particular to a composition of a chemical film-forming agent and a preparation method thereof. Background technique [0002] When it is necessary to paint steel plate metal workpieces to improve the corrosion resistance and weather resistance of the product, various oxidation, passivation, phosphating, etc. must be performed on the surface to form various conversion films as a coating In the traditional process, the bottom layer is treated with phosphating conversion and chromate passivation. At present, phosphating conversion usually refers to the process of treating the metal surface with a phosphating solution containing zinc, nickel, manganese and phosphate, and forming an insoluble phosphate film with a certain corrosion resistance on the metal surface. It can improve the adhesion between the metal substrate and the coating, and improve the corrosion resistance of the me...

AI Technical Summary

Problems solved by technology

At present, phosphating conversion usually refers to the process of treating the metal surface with a phosphating solution containing zinc, nickel, manganese and phosphate, and forming an insoluble phosphate film with a certain corrosion resistance on the metal surface. It can improve the adhesion between the metal substrate and the coating, and improve the corrosion resistance of the metal, but the heavy metal elements such as zinc, nickel, and manganese in the phosphating solution will cause serious harm to human health and the environment, and phosphorus will cause environmental pollution. The eutrophication of the water body, so the wastewater discharge of phosphating solution is strictly restricted; for chromate passivation, its advantages are: (1) the passivation solution is stable, and the process operation is simple; (2) the scope of application is wide (3) The passivation film has bright color, good corrosion resistance and decorative performance, but the main disadvantage is that the pollution to the environment and the harm to human health are relatively serious, and it is impossible to truly realize green environmental protection in actual production. Growing Awareness and Increasingly Restricted Use of Chromates

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