Corrosion behaviour of thixoformed and heat-treated ZA27 alloys in NaCl solution
By BOBIi, Biljana; BAJAT, Jelena; AiIMOVIC-PAVLOVIi, Zagorka; BOBIi, Ilija & JEGDIi, Bore
Published in Transactions of Nonferrous Metals Society of China
NULL
2013
Abstract
The influence of corrosion on the microstructure of thixoformed and heat-treated ZA27 alloys was investigated. The microstructure of ZA27 alloy was affected by heat treatment. The process of electrochemical corrosion occurs in both ZA27 alloys through the area of η phase. According to the results of immersion test and electrochemical measurements, the corrosion rate of the thixoformed ZA27 alloy is at least 50% lower than that of the thixoformed and thermally processed alloy. This indicates the unfavourable influence of applied heat treatment (T4 regime) on the corrosion resistance of the thixoformed ZA27 alloy.
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