Table 3.

Average corrosion rates based on weight loss method, corrosion current densities and potentials of the as-received and annealed pure iron samples obtained via the potentiodynamic polarization curves and resulting calculated corrosion rates.

Material	Icorr(μA.cm−2)	Potential (mV)	Corrosion rate (mm.yr−1)	Average corrosion rate (mm.yr−1)	Average grain size (μm)
As-received	20.89 ± 0.62	−732 ± 3	0.242 ± 0.013	0.138 ± 0.011	29.6 ± 4.0
85%UR-550	14.88 ± 0.92	−724 ± 4	0.172 ± 0.012	0.120 ± 0.006	14.1 ± 1.3
75%UR-800	18.50 ± 0.70	−735 ± 11	0.215 ± 0.043	0.127 ± 0.003	28.1 ± 2.9
85%UR-1000	21.05 ±2.63	−740 ± 8	0.244 ± 0.031	0.146 ± 0.007	168.0 ± 28