Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Post-processing of titanium microparts through electrochemical and chemical polishing
Submission Author:
Ana Carolina Bomfim Rodrigues , SC
Co-Authors:
Ana Carolina Bomfim Rodrigues, Santiago Javier Caraguay Correa, Julio Cordioli, Fabio Antonio Xavier
Presenter: Ana Carolina Bomfim Rodrigues
doi://10.26678/ABCM.COBEM2021.COB2021-1842
Abstract
Cutting processes normally require post-processing in order to eliminate burrs on the surface. In the laser cutting process also exists formation of a re-melted layer in the cutting region due to the solidification of the ejected molten material. To remove burrs and remelted layers, surface finishing methods can be used, such as chemical polishing, electrochemical polishing, mechanical polishing and laser polishing. This work aims to analyze the electrochemical and chemical polishing as a post-processing technique to improve the surface integrity of 0.1 mm thick laser machined microparts. The microparts consists of a titanium clamp used to attach a sensor to the middle ear in the case of fully implantable hearing devices (hearing aids and cochlear implants). Due to geometry and thickness of the workpiece, the post-processing is hampered. The electrochemical polishing was carried out by a solution composed by sulfuric acid as the process electrolyte and a stainless-steel piece for the electrode. Chemical polishing was carried out by immersing the parts in a solution of hydrofluoric acid (HF) and nitric acid (HNO3), in two different concentrations, for about one minute. Characterizations through optical microscopy and scanning electron microscopy were performed to evaluate the part integrity before and after polishing. Results show an improvement of workpiece quality in relation to burrs and re-melted layer.
Keywords
surface integrity, chemical polishing, electrochemical polishing, laser cutting, titanium
