Electronic Supplementary Material (ESI) for RSC Advances.
This journal is © The Royal Society of Chemistry 2015
2.5
2
log I,(µA/cm2)
1.5
1
0.5
Blank
0
50 ppm
100 ppm
-0.5
150 ppm
-1
-1.5
200 ppm
a
250 ppm
300 ppm
-2
-2.5
-975
-925
-875
-825
-775
-725
-675
-625
-575
E, mV (vs. SCE)
2.5
2
log I,(µA/cm²)
1.5
1
0.5
0
Blank
-0.5
50 ppm
-1
100 ppm
-1.5
150 ppm
-2
200 ppm
-2.5
250 ppm
b
300 ppm
-3
-3.5
-1000
-950
-900
-850
-800
-750
-700
-650
-600
-550
-500
E, mV (vs. SCE)
Fig.1. Potentiodynamic polarization of (a) E11N4 and (b) E11N6 for the carbon steel in formation
water containing sulfide ions in the absence and presence of various concentrations at 25ºC.
3.0
-Zi ,[kohm.cm²]
2.5
a
0.2 Hz
2.0
0.8 Hz
1,25Hz
1.5
Blank
50 ppm
3 Hz
1.0
100 ppm
150 ppm
10 kHz
200 ppm
0.5
250 ppm
300 ppm
0.0
0.0
0.5
1.0
1.5
2.0
2.5
Zr, [kohm.cm²]
3.5
0.2 Hz
-Zi, [kohm.cm²]
3.0
b
2.5
0.8 Hz
2.0
1.25 Hz
Blank
50 ppm
1.5
100 ppm
3 Hz
150 ppm
1.0
200 ppm
10 kHz
250 ppm
0.5
300 ppm
0.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Zr, [kohm.cm²]
Fig.2. Nyquist plot of(a) E11N4 and (b) E11N6 for the carbon steel in formation water containing
sulfide ions in the absence and presence of different concentrations at 25ºC.
4
-70
-60
a
-50
3
Phase [degree]
log Z,[ohm.cm2]
3.5
-40
-30
2.5
-20
2
-10
1.5
0
1
0.5
Blank
50 ppm
100 ppm
150 ppm
200 ppm
250 ppm
10
20
30
300 ppm
0
40
-2
-1
0
1
2
3
4
5
6
log Frequency,[Hz]
4
-80
b
-60
Phase [degree]
log Z,[ohm.cm2]
3.5
3
-40
2.5
-20
2
0
1.5
1
0.5
Blank
50 ppm
100 ppm
150 ppm
200 ppm
250 ppm
20
40
300 ppm
0
60
-2
-1
0
1
2
3
4
5
6
log Frequency,[Hz]
Fig.3. Bode plot of(a) E11N4 and (b) E11N6 for the carbon steel in formation water containing
sulfide ions in the absence and presence of different concentrations at 25ºC.