Effect of Cooling Rate at the Eutectoid Transformation Temperature on the Corrosion Resistance of Zn-4Al Alloy
1
Faculty of Mechanical Engineering, Wroclaw University of Technology and Science, 50-370 Wrocław, Poland
2
Faculty of Marine Engineering, Maritime University of Szczecin, 70-500 Szczecin, Poland
*
Author to whom correspondence should be addressed.
Materials 2020, 13(7), 1703; https://doi.org/10.3390/ma13071703
Received: 18 March 2020
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Revised: 31 March 2020
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Accepted: 3 April 2020
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Published: 5 April 2020
(This article belongs to the Special Issue Corrosion and Protection of Materials)
The main purpose of this work was to experimentally determine the effect of the cooling rate during the eutectoid transformation on the corrosion resistance of a hypoeutectic Zn-4Al cast alloy in 5% NaCl solution. This was considered in relation to the alloy microstructure. For this purpose, metallographic and electrochemical studies were performed. It was found that the faster cooling promoted the formation of finer (α + η) eutectoid structures, which translated into a higher hardness and lower corrosion current density. In the initial stage of corrosion processes the eutectoid structure in the eutectic areas were attacked. At the further stages of corrosion development, the phase η was dissolved, and the α phase appears to be protected by the formation of corrosion products.
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Keywords:
zinc alloys; Zamak; Zn-Al alloys; heat treatment; corrosion resistance; microstructure
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MDPI and ACS Style
Lachowicz, M.M.; Jasionowski, R. Effect of Cooling Rate at the Eutectoid Transformation Temperature on the Corrosion Resistance of Zn-4Al Alloy. Materials 2020, 13, 1703. https://doi.org/10.3390/ma13071703
AMA Style
Lachowicz MM, Jasionowski R. Effect of Cooling Rate at the Eutectoid Transformation Temperature on the Corrosion Resistance of Zn-4Al Alloy. Materials. 2020; 13(7):1703. https://doi.org/10.3390/ma13071703
Chicago/Turabian StyleLachowicz, Marzena M., and Robert Jasionowski. 2020. "Effect of Cooling Rate at the Eutectoid Transformation Temperature on the Corrosion Resistance of Zn-4Al Alloy" Materials 13, no. 7: 1703. https://doi.org/10.3390/ma13071703
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