
380 Fundamentals of Machining Processes
debris and the damaged layer caused by mechanical polishing methods.
These drawbacks are overcome using electropolishing (EP). As shown in
Figure 11.25, a DC is introduced into the part, which is hung from a center
electrode and is surrounded by cathodes that are negatively charged. The EP
medium is a liquid mixture of several acids and insoluble salts. EP is affected
by many parameters that include workpiece material and condition, original
surface roughness, current density, and acid type, temperature, and agita-
tion. The EP process nds many applications such as
1. Preparing surfaces for electropla ...