The electrospark deposition (ESD) technique has been successfully applied to deposit at room temperature a cermet layer of Cr7C3carbide bound with 20 wt.% Cr on a AISI 304 stainless steel substrate. It has been possible to obtain a fully dense, uniform and strong adherent coating layer of 10-30-μm thickness. The corrosion properties of this coating system have been evaluated in HCI electrolyte by conventional anodic polarization tests and impedance measurements. The results indicate an exceptional resistance of the coating to both general and localized corrosion attack. Some surface stress relief microcracks formed during the ESD deposit cycles do not impair the corrosion resistance of the coating even after long time immersion in HCI. © 2002 Elsevier Science B.V. All rights reserved.
All Science Journal Classification (ASJC) codes
- Surfaces, Coatings and Films
- Condensed Matter Physics
- Surfaces and Interfaces