Corrosion properties of plasma electrolytic coated samples

Abstract

Purpose

Plasma electrolytic saturation (PES) treatments were applied on the surface of AISI H13 steel and corrosion resistance of the treated samples was investigated using electrochemical test methods. The aim was to obtain optimal corrosion resistance of the differently treated samples.

Design/methodology/approach

Nitrocarburized and boride layers were produced on AISI H13 steel by the means of the PES technique. Different experimental parameters during each treatment provided different microstructural and electrochemical properties. The techniques used in the present investigation included X‐ray diffraction, SEM, potentiodynamic polarization measurements and electrochemical impedance spectroscopy (EIS).

Findings

The plasma electrolytic nitrocarburising coating was characterized by lower integrity than a PEB coating. All PES coated steels had a noble electrochemical behavior compared to the untreated steel. Different nano‐structures and morphologies obtained by different experimental parameters produced different electrochemical behaviors.

Practical implications

The results obtained in this research into PES techniques can be used wherever good corrosion resistance with the highest efficiency is required.

Originality/value

The speed of treatment by plasma electrolytic saturation techniques makes this method very suitable for industrial production of components.

Citation

Taheri, P., Aliofkhazraei, M., Dehghanian, C. and Sabour Rouhaghdam, A. (2007), "Corrosion properties of plasma electrolytic coated samples", Anti-Corrosion Methods and Materials, Vol. 54 No. 3, pp. 148-154. https://doi.org/10.1108/00035590710748614