Influence of laser surface hardening on corrosion properties of Al-Zn-Si cast alloy

• Published in: Metalurgija Vol. 56; no. 1-2; p. 47
• Main Authors: Tillová, E, Kuchariková, L, Chalupová, M, Belan, J, Vaško, A, Švecová, I
• Format: Paper
• Language: English
• Published: Hrvatsko Metalursko Društvo (HMD) 02-01-2017
• Subjects: Al-Zn-Si cast alloys; corrosion properties; laser surface hardening; microstructure
• ISSN: 0543-5846; 1334-2576

This work is focused on the effect of the laser surface treatment (laser power 50 and 80 W) on microstructure and corrosion properties of self-hardened AlZn10Si8Mg cast alloy used for engine and vehicle constructions. The electrochemical impedance spectroscopy (EIS) technique and Nyquist plots in a 1M NaCl test solution at 20 °C were carried out. A detailed corrosion study showed that corrosion resistance samples with laser layer were marginally less; probably the presence of chloride ions significantly damaged the Al2O3 film and caused the formation of NaAlO2.