Choice of metal etching methods

There are two main methods of metal etching based on the contact form of the workpiece with the solution, namely spray etching and bubble etching. There are two principles for selecting etching methods.

1. Production volume: Spray etching has high efficiency, fast speed and high precision, and is suitable for certain batch production. The production is easy to realize automatic control, but the equipment investment is large, and it is not suitable for etching special-shaped workpieces and large workpieces; The investment of bubble etching equipment is small, etching is convenient, and the range of workpieces used is wide.

2. Workpiece shape and size: Due to equipment limitations, it is difficult to use spray etching for large workpieces, while immersion etching will not be affected by the size of the workpiece. The shape of the workpiece is complex. During spraying, some parts may not be sprayed in place, which will affect the normal progress of etching. The soaking type soaks the entire workpiece in the etching solution. As long as the dynamic between the solution and the workpiece is maintained , it can ensure that all parts of the heterogeneous workpiece can be filled with etching liquid and the new liquid and old liquid can be continuously replaced, so that etching can proceed normally.

For small flat or nearly flat workpieces, if conditions permit, spray etching is superior to bubble etching in terms of efficiency and accuracy. Therefore, for workpieces with a large batch size, moderate size, and simple shape, the spray method is the first choice; if the workpiece shape is large, it is difficult to use an etching machine, the workpiece shape is complex, and the batch size is not large, this method is to use the soaking method. The formula is appropriate.