Environment-friendly deplating agent as well as preparation method and use method thereof

Abstract

The invention discloses an environment-friendly deplating agent as well as a preparation method and a use method thereof. Each liter of the environment-friendly deplating agent comprises 20-100g of sodium persulfate, 100-300mL of concentrated sulfuric acid, 2-10g of ferric chloride hexahydrate, 0.005-0.1 g of a wetting agent, 1-10g of an imidazole slow release agent, 1-10g of citric acid and water as a solvent. The environment-friendly deplating agent is safe, environmentally friendly and low in use temperature (30-40 DEG C), and has the characteristics of being clean in deplating, free of corrosion to a matrix and high in deplating speed; sodium persulfate and ferric chloride hexahydrate are adopted as main substances for dissolving a nickel layer, then an imidazole slow-release agent and citric acid are added, the nickel stripping effect is guaranteed, meanwhile, copper or copper alloy of a metal base material cannot be corroded, and the copper corrosion speed is smaller than 0.33 micrometer / min; besides, in the production process of existing printed circuit boards, plastic antenna oscillators and other products, a palladium layer is further arranged between the base material and the nickel plating layer, and after the environment-friendly deplating agent finishes deplating of the nickel plating layer, the palladium layer between the base material and the nickel plating layer can also be deplated.

Description

technical field [0001] The invention relates to the technical field of stripping agents, in particular to an environment-friendly stripping agent and a method for preparing and using the same. Background technique [0002] Stripping refers to the process of removing the coating on the surface of the workpiece, which is an inevitable part in the field of electroplating. There are generally two existing stripping methods: one is chemical stripping, in which the stripped parts are immersed in a stripping solution, and the principle is to use chemical dissolution to remove the coating; the other is electrolytic stripping, which removes the coating. The stripped parts are placed in the stripping solution for electrolysis. The electrolysis method has weak corrosion to the base material, and the recycling of some metals is conducive to environmental protection, but it needs to provide power supply and stripping tank, and sometimes special hangers are required. The investment cost ...

AI Technical Summary

Problems solved by technology

There are generally two kinds of existing deplating methods: one is chemical deplating, and the deplating parts are soaked in the deplating solution, and its principle is to use chemical dissolution to remove the coating; the other is electrolytic deplating, which The deplated parts are placed in the deplating solution for electrolysis. The electrolysis method has weak corrosion on the substrate and is beneficial to environmental protection for some metals. However, it needs to provide power supply and deplating tank, and sometimes special hangers are required. Disposable The input cost is high. In addition, electrolytic deplating is only suitable for conductive lines, and electrolytic deplating cannot be used for isolated metal lines. This is not good for workshops that are not mass-produced

[0003] At present, there are three types of chemical solution systems for removing nickel plating by chemical method: one is the cyanide system chemical stripping solution, which contains highly toxic cyanide-containing compounds, which will cause serious pollution to the environment and endanger human health. The second is the chemical stripping agent of sodium m-nitrobenzene sulfonate system. This type of stripping agent has a higher service temperature, usually 60-70 ° C, and the nickel stripping time is longer. In addition, m-nitrobenzene sulfonic acid Sodium is highly toxic and not easy to use in large quantities; the third is the sulfuric acid-hydrogen peroxide system chemical stripper, the nickel stripping steps are cumbersome, the nickel stripping time is long, and the copper corrosion speed is fast

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