Mandal, G K and Das, Suchandan K and Balasubramaniam, R and Mehrotra, S P (2011) Evolution of microstructures of galvanised and galvannealed coatings formed in 0.2 wt-% aluminium–zinc bath. Materials Science and Technology, 27 (8 ). pp. 1265-1270.
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The present investigation examines the evolution of the microstructures of galvanised steel during the galvannealing process with a special reference to the formation and breakdown behaviour of aluminium rich inhibition layer at the substrate/coating interface. The interstitial free steel was galvanised in a molten zinc bath with 0?2 wt-% aluminium content. The bath temperature and strip entry temperatures were 460 and 480uC respectively. Aluminium of 0?2 wt-% was chosen to retard the formation of iron–zinc intermetallic compounds in the coating. The as dipped galvanised interstitial free steel was annealed above the melting point of zinc in a salt bath at 480uC for a period ranging from 1 to 60 s. After annealing, the as galvanised coatings exhibited microstructural changes as a function of test time. The present work highlights the possible mechanisms of nucleation of iron–zinc intermetallic compounds during galvannealing treatment of steel galvanised in aluminium containing zinc bath.
|Uncontrolled Keywords:||IF steel, Galvanising, Galvannealing, Microstructure, Inhibition layer|
|Divisions:||Metal Extraction and Forming|
|Deposited By:||Dr Gopi Kishor Mandal|
|Deposited On:||16 Aug 2012 10:02|
|Last Modified:||16 Aug 2012 10:34|
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