PCB (Polychlorinated Biphenyl) acidic etching solution

Abstract

The invention discloses a PCB (Polychlorinated Biphenyl) acidic etching solution which comprises the following components: 130-180 g / L of etching mother liquid copper, 120-200 g / L of hydrochloric acid (the concentration of the hydrochloric acid is 30%-38%), 150-250 g / L of oxidizing agents, 120-250 g / L of industrial salt, 0.5-15 g / L of stabilizing agents, 5-30 g / L of accelerating agents, 0.05-0.2 g / L of buffering agents and the balance of water. According to the PCB acidic etching solution, the acid value of the hydrochloric acid can be controlled to be less than 1.8 N and is greatly lower than the acid value less than 2.5 N in the prior art; the etching uniformity can reach more than 90%; and the etching factor is more than 3.5, so that the accuracy of an etching route figure and the stability of the etching solution are effectively ensured.

Description

technical field

[0001] The invention relates to the technical field of PCB (printed circuit board) manufacturing technology, in particular to a PCB acid etching solution. Background technique

[0002] In the manufacture of printed circuit boards, in addition to multiple wiring, additive methods, etc., traditional printed circuit boards use chemical reactions to remove unnecessary copper on the PCB to form the required circuit. graphics. The pattern transfer or screen printing method used as the circuit pattern part makes the photoresist of the organic compound system or the metal resist layer cover the surface of the circuit pattern to prevent the metal copper from being etched away. Therefore, the etching process is an indispensable and important step in the manufacture of printed circuit boards. The resist used in PCB acid etching solution is coated with screen printing or coated with anti-corrosion dry film, liquid photoresist and other materials, which are suitable for...