ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
To address the increasing demand for high performance and high quality die castings,Zn-Al casting alloys have been developed, in particular for applications in the automotive industry.This family of alloys has good physical, mechanical and tribological properties and is commonlyused as foundry alloys in a variety of applications. Particularly, the Zn-22 wt% Al eutectoid alloy isa classic commercial material and a fine-grained structure can be obtained by using a suitable heattreatment which can induce a superplastic behavior. On the other hand, this heat treatment canaffect the corrosion behavior of such alloy. The present work focuses on the influence of as-cast andquenched microstructures of the Zn-22wt%Al eutectoid alloy on its electrochemical corrosionbehavior. The typical microstructural patterns were examined by using optical microscopytechniques. In order to evaluate the corrosion behavior of such alloy, corrosion tests were performedin a 0.5 M NaCl solution at 25ºC by using an electrochemical impedance spectroscopy (EIS)technique and potentiodynamic polarization curves. An equivalent circuit by using the ZViewsoftware was also used to provide quantitative support for the discussions and understanding of theelectrochemical corrosion behavior. It was found that the heat-treated samples are more susceptibleto the corrosion action than the as-cast alloy sample
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.587-588.355.pdf
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