Journal of Chemistry / 2013 / Article / Tab 2

Research Article

Effects of Immersion Time and 5-Phenyl-1H-tetrazole on the Corrosion and Corrosion Mitigation of Cobalt Free Maraging Steel in 0.5 M Sulfuric Acid Pickling Solutions

Table 2

EIS parameters obtained by fitting the Nyquist plots shown in Figures 5, 6, and 7 with the equivalent circuit shown in Figure 8 for the maraging steel in sulfuric acid solutions containing different concentrations of PHTA.

SolutionParameter
/  cm2   /  cm2 /  cm2
/F cm−2

0.5 M H2SO4 (0 min)1.460.012140.837.341.740.32
+1.0 mM PHTA (0 min)1.650.004550.808.562.461.37
+5.0 mM PHTA (0 min)1.940.002130.7712.943.573.74
0.5 M H2SO4 (60 min)1.330.048820.805.961.290.293
+1.0 mM PHTA (60 min)1.480.005510.797.282.341.181
+5.0 mM PHTA (60 min)1.780.003510.769.883.142.468
0.5 M H2SO4 (120 min)1.050.060540.943.971.180.049
+1.0 mM PHTA (120 min)1.240.019630.815.732.171.131
+5.0 mM PHTA (120 min)1.490.016740.767.912.922.139

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