High-efficiency and high-quality acidic cupric chloride etchant for printed circuit board

摘要

A high-efficiency and high-quality acidic cupric chloride etchant for printed circuit board, which contains cupric chloride, a sub-etchant and an oxidant, where the sub-etchant includes (in percentage by weight) 1%-36.5% of Hcl; 0.01%-45% of one or more compounds selected from FeCl3, FeCl2, Fe, FeO and Fe2O3. The etchant is used in connection with an automatic detection and charging control during the etching process to ensure the concentration of copper ions, the concentration of dissociated hydrogen ions and the oxidation-reduction potential in the solution arriving at set numerical values.

主权项

1. A high-efficiency and high-quality acidic cupric chloride etchant for printed circuit board, comprising cupric chloride, a sub-etchant and an oxidant, wherein an automatic detection and charging control machine is used for detecting the concentration of dissociated hydrogen ions, oxidation-reduction potential and specific density parameters in the etchant and controlling the charging amount of each component so as to enable the concentration of copper ions, the concentration of dissociated hydrogen ions and the oxidation-reduction potential in the solution to arrive at set numerical values, and the high-efficiency and high-quality acidic cupric chloride etchant for printed circuit board is characterised in that the sub-etchant comprises the following components in percentage by weight:
1%-36.5% of HCI; 0.01%-45% of one or more compounds selected from FeCI3, FeCl2, Fe, FeO and Fe2O3; and the balance of water, the control parameters of a production process of the obtained etchant are set as follows: the concentration of dissociated hydrogen ions is 0.1-5.0M, the oxidation-reduction potential is 380-700 mV and the concentration of copper ions is 1-180 g/L; the initial charging amount B of cupric chloride is obtained by calculation according to the following formula:
B=(134.5/63.5)×set value A of concentration of copper ions.