Journal
CORROSION ENGINEERING SCIENCE AND TECHNOLOGY
Volume 54, Issue 7, Pages 575-586Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/1478422X.2019.1637077
Keywords
Aluminium-lithium alloys; thermomechanical treatments; severe localised corrosion
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The influence of T3, T8 and T851 thermomechanical treatments on the microstructure and corrosion resistance of the AA2198 was investigated. Differential scanning calorimetry and scanning electron microscopy were used for microstructural characterisation, whereas electrochemical methods were employed to analyse the corrosion behaviour of the alloy. The morphology and composition of constituent particles were similar for the T3 and T8 thermomechanical treatments but varied in the T851. There was an inverse relation between T1 phase density and corrosion resistance. The T3 treatment with the highest corrosion resistance was the one with the lowest density of T1 phase. The mechanisms of corrosion varied with the thermomechanical treatments.
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