Galvanisches Verzinken von Magnesiumlegierungen |
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| Authors: | H Pokhmurska B Wielage Th Lampke Dr M Zacher U Fischer L Kwiatkowski M Grobelny |
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| Affiliation: | 1. Institute of Composite Materials and Surface Technology, Chemnitz University of Technology, Germany;2. Institute of Precision Mechanics, Warsaw, Poland |
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| Abstract: | Zinc‐Plating of Magnesium Alloys Magnesium alloys are highly susceptible to corrosion that limits their application when exposure to corrosive service conditions is needed. One of the ways to prevent corrosion is to coat the magnesium‐based substrate to avoid a contact with an aggressive environment. Results concerning corrosion behaviour of wrought AZ31 magnesium alloy with electrolytic zinc coatings deposited from different electrolyte solutions are described. Evaluation of corrosion processes in chlorides containing solutions was performed by electrochemical measurements. It was found that thick and dense electrolytic zinc coatings formed on AZ31 significantly improve the corrosion behaviour of magnesium alloy after one hour immersion of zinc coated magnesium alloys in corrosive media. Further increase of immersion time leads to relatively fast decrease of corrosion properties. Electrolytic zinc coatings obtained in consecutive alkaline / acidic process demonstrate an improvement of corrosion resistance of coated AZ31. The time to coating degradation strongly increases. |
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| Keywords: | Magnesiumlegierung Zinkschicht galvanische Zink‐Abscheidung Korrosionsverhalten magnesium alloy zinc coating electro plating of zinc corrosion behaviour |
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