Environment-friendly nickel stripper and its preparation method and application method

Abstract

The invention relates to an environment-friendly nickel stripper and its preparation and use method. The nickel stripper contains per liter of solution: 30-150 g of sulfuric acid solution, 20-50 g of hydrogen peroxide solution, 4-10 g of nitric acid solution, and a solubilizer 1-10g, 1-5g complexing agent and 1-5g stabilizer, the solvent is pure water. The nickel stripping agent of the present invention adds a small amount of nitric acid to the sulfuric acid-hydrogen peroxide system to quickly strip nickel, and the stripping speed of the nickel-plated layer reaches 2-4μm / min, has no corrosion to the stainless steel substrate, and uses little nitric acid, which can reach Environmental requirements.

Description

technical field [0001] The invention relates to a nickel stripper, in particular to an environment-friendly nickel stripper, a preparation method and a use method thereof. Background technique [0002] With the development of modern science and technology and industrial construction, electroplating nickel and its alloys have been widely used as a process technology, but in the process of production, there will always be some unqualified products and electroless nickel plating cylinders in the hanger. Bulk nickel coating, they may not be coated with nickel layer locally, or may have poor anti-corrosion ability. For workpieces with strict tolerance dimensions, the thickness of the coating cannot meet the standard, and defects such as pinholes and spots will appear on the surface. If you throw it away directly , It will cause cost increase, and it is also a waste of resources, so nickel stripping is usually performed on poor nickel plating layer or nickel plating layer of racks...

AI Technical Summary

Problems solved by technology

Although the electroplating nickel stripping method has a fast stripping speed, it requires a special power supply, and its one-time investment cost is relatively large. Moreover, due to the different shapes of the workpiece and the uneven distribution of the power lines, the stripping speed of the plating layer on each part of the workpiece varies greatly. , leading to local corrosion of the matrix

Chemical deplating is relatively simple, and the cost is relatively low. Using chemical deplating method, regardless of whether the working surface is flat or not, the stripping effect is very good, so it is widely used, but the stripping rate of this method is low

Currently commonly used chemical deplating methods: there are cyanide method and concentrated nitric acid method. The former cyanide is a highly toxic substance, which is very dangerous to the experimenter itself, and has basically been banned from use; while the concentrated nitric acid method is too acidic. It is easy to corrode the abutment, and also produces a large amount of smoke, which is very harmful to the human body. At the same time, it is dangerous to operate and is not easy to control, and its liquid medicine will contain a large amount of N elements, making the total nitrogen content in the waste liquid too high , does not meet the manufacturer's wastewater discharge standards, causing certain environmental pollution

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