Electropolishing Post-Treatment
Electropolishing post-treatment is an electrochemical process to smooth surfaces and improve corrosion resistance. It is often applied after pickling to refine the final products.
Physico-Chemical Mechanism of Action
Electropolishing is a process in which an electrode (in this case, the metal) is placed in an electrolytic saltwater solution. An electrical voltage causes ions to be removed from the metal surface and transferred to the other electrode (anode). This removes microscopic roughness and forms a smooth surface.
Metallurgical Relevance & Welding Risks
Electropolishing post-treatment increases the corrosion resistance of the surface, which extends the service life of metal parts. However, it can also lead to a change in the microstructure if the metal is not treated correctly. This can result in reduced stress capacity and cracking.
Workshop Practice & Operating Instructions
For successful electropolishing post-treatment, it is important to set the correct electrolyte concentration and the appropriate voltage. Temperature control can also help achieve a uniform result. The polishing time should be precisely determined to avoid over-polishing, which can alter the microstructure.