Abstract
When a metal partly covered with chemical resistant film is dipped into work-solution made from acid, alkali, or others, only the exposed surface is dissolved and a work similar to a mechanical milling is achieved. An experimental research was made on the chemical resistant film, the surface treatment and the machining speed in this method. As the first step, aluminum plate was chemically machined by the use of caustic soda solution as a working solution.
While the chemical resistant film was required to have various characteristics, a synthetic rubber film was the most favorable as a chemical resistant material. The side etching depended remarkably on the pre-treatment of the specimen surface, and an insufficient pretreatment gave an extremely large and irregular side etching.
While the machining speed increased with the solution temperature and the concentration of the working solution, and decreased with the working time of the solution, it was concluded that temperature was the most predominant factor in controlling the machining speed.
