Its advantages are less investment in processing equipment, large and complex parts can be polished. It is a polishing with fast speed, high efficiency and good corrosion resistance. Its defect is poor brightness, gas overflow, need ventilation equipment and difficult to heat. It is suitable for processing small batches of complex shape parts and small parts with low brightness requirements.

Chemical polishing is to dissolve the bulge parts(chemical medium) in advance of the recessed parts so as to get a smooth surface. The important advantage of this method is that it does not need complicated equipment, but can polish complex workpieces and can polish many parts at the same time with high efficiency. Its key point is the preparation of polishing fluid. The roughness of the surface obtained by chemical polishing is generally 10 um.