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EFFECT OF THE HEAT AND SURFACE LASER TREATMENT ON THE CORROSION DEGRADATION OF THE Mg-Al ALLOYS

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Author(s): Leszek A. Dobrzański | Tomasz Tański | Szymon Malara

Journal: Materials Engineering
ISSN 1335-0803

Volume: 18;
Issue: 3;
Start page: 85;
Date: 2011;
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Keywords: Metallic alloys | Corrosion resistance | Metallography | High Power Diode Laser | SEM

ABSTRACT
In this paper there is presented the corrosion behavior of the cast magnesium alloys as cast state, after heat and laser treatment. Pitting corrosion resistance of the analyzed alloys was carried out using the potentiodynamic electrochemical method (direct current), based on a anodic polarization curve. On the basis of the achieved anodic polarization curves, using the Tefel extrapolation method near to the corrosion potential, the quantitative data were determined, which describe the electrochemical corrosion process of the investigated alloys: value of the corrosion potential Ecorr (mV), polarization resistance RP (kohm.cm2), corrosion current density icorr (10-6A/cm2), corrosion rate Vcorr (mm/year) as well the mass loss Vc (g/m2
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