Electrolytically recoverable etching solution

Abstract

The invention relates to an electrolytically recoverable etching solution, especially for etching printed boards and molded parts from copper and copper alloys. Said etching solution is substantially constituted of water, ammonia, copper (II) sulfate, ammonium sulfate and optionally a vanadium-containing catalyst for increasing etching speed. The inventive etching solution is characterized by additionally containing methylene blue or its derivatives as a catalyst.

Description

technical field [0001] The invention relates to an electrolytically recoverable etching solution, in particular for etching printed circuit boards and shaped parts of copper and copper alloys, which essentially consists of a certain content of water, ammonia, copper sulfate, ammonium sulfate and any Vanadium-containing catalyst composition selected to increase etch rate. Background technique [0002] Conventional etching solutions are used in various forms and embodiments, especially for etching printed circuit boards. In the manufacturing process, accelerating the etching process also plays a very important role, which requires that the recovery process of the etching solution should also be accelerated. [0003] In one method of preparing a printed circuit board, a circuit pattern is coated on a copper surface as a photoresist (Resist) pattern by screen printing or by optical processing. The copper surface not covered by the photoresist is then ablated with a suitable et...

AI Technical Summary

Problems solved by technology

The disadvantage is that the etching rate is limited and the recovery process cannot be performed quickly enough to regenerate the etching solution