Deposited metal stripping agent and preparation method thereof

Abstract

The invention discloses a deposited metal stripping agent for stripping metals deposited on the inner surface of a chemical plating tank and a preparation method of the deposited metal stripping agent. The deposited metal stripping agent comprises the following components: 250-300ml / L sulfuric acid (98%), 80-100ml / L hydrogen peroxide, 50-60ml / L alcohol, 2-3g / L urea, 25-30g / L tartaric acid, 20-25ml / L propylene glycol, 0.01-0.02g / L sodium lauryl sulfate and the balance of water. The preparation method comprises: adding running water the volume of which is 1 / 2 of that of a prepared liquid into a container at normal temperature; slowly adding the sulfuric acid (98%) while stirring continuously; then sequentially adding hydrogen peroxide, alcohol, urea, tartaric acid, propylene glycol and sodium lauryl sulfate; continuously stirring to dissolve the added substances; adding the balance of running water; and stirring until the mixed solution is homogeneous and transparent. As nitric acid is not contained, the deposited metal stripping agent disclosed by the invention does not generate harmful gas, is environment-friendly and pollution-free; and meanwhile, the cost comparison of each component is relatively low, thus the cost is low.

Description

technical field [0001] The invention relates to a metal stripper, more precisely to a deposited metal stripper for stripping the metal deposited on the inner surface of an electroless plating bath, and to a preparation method of the deposited metal stripper. Background technique [0002] In the process of electroless nickel-phosphorus or nickel-tungsten-phosphorus plating, deposited metal is often produced on the surface of the plating tank, which not only increases the additional consumption of the plating solution, but also reduces the quality of the plating layer, and even causes the plating solution to decompose spontaneously, so it needs to be removed frequently. [0003] In the past, concentrated nitric acid was often used to remove the deposited metal on the surface of the plating tank, which caused serious harmful gas pollution. In order to overcome this problem, the patent publication No. CN1948552A proposes to add 2-4g / L hydrogen peroxide in the electroless plating...

AI Technical Summary

Problems solved by technology

This method will significantly change the composition of the plating solution, reduce the quality of the coating, and make it difficult for the plating solution to continue to be used for the purpose of electroless plating, so it is also uneconomical.

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