Corrosion behavior of 0.02–2.0wt% Vanadium alloyed grey iron

This paper focused on corrosion behavior of grey cast iron having 0.02wt %, 0.5wt% and 2wt% vanadium as the alloying elements. Vanadium alloyed grey cast iron samples were produced by using Y - block CO₂ sand casting process and poured into double cylinder mould. The corrosion behavior was measured from polarization method, under 3.5% NaCl aqueous solution, conducted at room temperature. The corroded surfaces were then observed through scanning electron microscopy (SEM) and the compositions were obtained through sparked EDX analyzer. The microstructure vanadium alloyed grey cast iron show the presences of graphite flakes surrounded by ferritic structures. The corrosion rate, which was obtained from polarization test indicated that 2% alloyed grey cast iron produced better corrosion resistance compared with 0.02% and 0.5% vanadium alloyed grey cast iron.