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Effect Of Carbon Doped Aluminium On Corrosion Response Of Galvanised Steel In Seawater

Journal: International Journal of Scientific & Technology Research (Vol.3, No. 8)

Publication Date:

Authors : ; ; ; ;

Page : 57-63

Keywords : Index Terms Carbon Doped Aluminium; Galvanised steel; Corrosion; Microstructure;

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Abstract The uses of galvanised mild steel in many engineering facilities offshore necessitate its protection against all forms of service induced corrosion. This can only be achieved by devising innovative corrosion mitigation measures capable of providing effective and reliable control. Hence this paper investigates the corrosion propensities of galvanised steel in seawater using specially prepared carbon doped aluminium as sacrificial anode. The 6063 aluminium was doped by adding varied amount of carbon in form of graphite particles to molten aluminium and mechanically stirred vigorously before casting. Then the commercial galvanised steel and carbon doped aluminium coupons were coupled in a corrosion cell with seawater as the electrolyte. Corrosion simulation lasted seventy days and the data obtained was analysed. Results show that corrosion of the carbon doped aluminium increased with increase in doping of aluminium. The cathodically protected galvanised steel sufferred minimal corrosion rate of 4.9 x 10-2 mpy compared with the undoped aluminium anode which exhibited a huge 38.9 x 10-2 mpy corrosion rate. The microstructure before and after corrosion also revealed that surface attack was more pronounced on the carbon doped aluminium relative to the galvanised steel. It thus appears that doping of aluminium with carbon is an effective corrosion mitigation alternative for galvanised steel in seawater.

Last modified: 2015-06-28 03:59:43