Phosphorus-free, fluorine-free and heavy metal-free phosphorus displacing agent and preparation method thereof

Abstract

The invention discloses a phosphorus-free, fluorine-free and heavy metal-free phosphorus displacing agent and a preparation method thereof. The phosphorus displacing agent is prepared from the following raw materials in percentage by weight: 1-28% of salt, 1- 15% of acid, 1-15% of alkali, 0.1-5% of additive, 0.1-9% of screening agent and the balance of tap water. The preparation method comprises the following steps of: a, preparing the materials; b, preparing the screening agent; c, preparing the additive; d, adding the balance of tap water into a plastic reaction kettle, heating and cooling the mixed solution, adding the acid and adding the alkali to regulate a pH value to 4 to 6; e, adding the additive; and f, adding the screening agent, and filtering the mixture to obtain a filtrate product. By the phosphorus-free, fluorine-free and heavy metal-free phosphorus displacing agent and the preparation method thereof, the phosphorus-free, fluorine-free and heavy metal-free raw materials are adopted, waste water produced in production and using processes does not contain pollutants such as phosphorus, fluorine, heavy metals and the like, is not required to be purified and can be directly discharged, and hazardous solid wastes are avoided, so pollution to the environment and damages to human bodies are avoided, pollution discharge cost is greatly saved and the protection of an ecological environment is facilitated; and when the phosphorus displacing agent is used, a film formed on the surface of the product is uniform, compact, continuous, highly adhesive and highly anticorrosive, and the phosphorus displacing agent can completely replace a bonderite.

Description

technical field [0001] The invention relates to a phosphorus-replacement agent free of phosphorus, fluorine and heavy metals and a preparation method thereof, belonging to the technical field of metal surface chemical treatment. Background technique [0002] Phosphating treatment technology is widely used in automobile industry, machinery industry, household appliances, shipbuilding industry, aviation industry, weapons and equipment manufacturing and other fields. Phosphating technology has been developed for more than 100 years, and many new achievements have been made in modern times. Especially since the reform and opening up, with the rapid development of the hardware industry, household appliances and automobile industry, the phosphating process has been greatly expanded in its industrial application fields, making it an indispensable and important process technology for steel processing, anti-corrosion, decoration, etc.; According to the China Iron and Steel Phosphati...

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the environmental pollution problems existing in the existing phosphating agents, the purpose of the present invention is to provide a phosphorus-replacing agent that is free of phosphorus, fluorine, and heavy metals, so as to completely replace the phosphating agents, avoid polluting the environment, and reduce the pollution caused by enterprises. Expense; Another object of the present invention is to provide the preparation method of this fosone substitute