The influence of etching speed on the process in etching

The influence of etching speed on the process in etching

Etching speed and side etching amount are the most important parameters in the chemical etching process. Side etching amount determines the precision of chemical etching. The smaller the side etching amount, the higher the processing precision and the wider the application range.

Conversely, the lower the processing precision, the narrower the application range. In the process of multiple metals, copper has the smallest side etching amount, and aluminum has the largest side etching amount. In chemical etching, the etching speed determines the length of the etching process cycle. The faster the etching speed, the shorter the etching process cycle and the higher the production efficiency. The faster the etching speed, the better. There are several main reasons:

  1. The faster the etching speed, the greater the amount of metal etching per unit time, the greater the heat generation, and the faster the temperature of the etching liquid changes, which is not conducive to the constant etching speed.
  2. The faster the etching speed, the more difficult it is to control metal processing with very precise depth requirements
  3. The faster the etching speed, the lower the quality of the metal surface after etching, which significantly affects the smoothness and glossiness of the etched surface
  4. High etching speeds often require high concentrations of corrosive agents, highly corrosive chemical reagents, high etching temperatures, etc.

For materials that require a large amount of etching, the “fast first, slow later” method is used, which means that a faster etching solution is used for etching first. When the etching depth is close to the design requirement, a slower etching solution is used for precision etching. Although this increases the number of steps, it shortens the processing time while also ensuring etching accuracy and surface gloss.

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