Research Article

Effect of Diacetyl Monoxime Thiosemicarbazone on the Corrosion of Aged 18 Ni 250 Grade Maraging Steel in Sulphuric Acid Solution

Table 2

Results of Tafel polarization studies on aged maraging steel in 0.5 M sulphuric acid with and without different concentrations of DAMTSC at various temperatures.

Temp (K)Conc. of inhibitor ( 10−4) (M) (V)   × (10−4) (A cm−2) (V dec−1) (V dec−1)C.R in mm Y−1IE (%)

3030.00−0.31075.260.1070.10387.30
1.14−0.31027.180.1030.10231.5363.9
2.85−0.30611.720.0950.10613.6084.4
5.70−0.3069.570.1060.11311.1087.3
8.55−0.3037.730.0930.1118.9789.7
3080.00−0.31285.430.1220.12799.10
1.14−0.31032.070.1270.09837.2062.5
2.85−0.30921.640.0980.11225.1074.7
5.70−0.30413.190.1120.11515.3084.6
8.55−0.30710.990.1150.11812.7587.1
3130.00−0.30996.550.1180.112112.00
1.14−0.30937.670.1120.08643.7061.0
2.85−0.30726.210.0860.08430.4072.9
5.70−0.30817.760.0840.10620.6081.6
8.55−0.30414.400.1060.08616.7085.1
3180.00−0.312106.900.0860.117124.00
1.14−0.30550.950.1170.09859.1056.5
2.85−0.30536.810.0980.09542.7068.6
5.70−0.30824.220.0950.08928.1079.3
8.55−0.30119.050.0890.09822.1083.8
3230.00−0.311117.240.0980.123136.00
1.14−0.30358.970.1230.09568.4049.7
2.85−0.30542.840.0950.09149.7063.5
5.70−0.30330.090.0910.08834.9074.3
8.55−0.30125.950.0880.08830.1077.9