CHEM02200704003 Nilamadhab Pandhy - Homi Bhabha National ...

Chapter 4
Potential (V) Vs Ag/AgCl
2.0
1.5
1.0
0.5
0.0
-0.5
0.1 M HNO 3
0.5 M HNO 3
0.6 M HNO 3
1 M HNO 3
-1.0
10 -2 10 -1 10 0 10 1 10 2 10 3 10 4
Log Current density (µA/cm 2 )
Fig.4.5: Potentiodynamic polarization study of 304L SS in 0.1 M, 0.5 M, 0.6 M and 1 M HNO 3
[20].
Conc of HNO 3
E corr
(mV vs Ag/AgCl)
I corr
(µA/cm 2 )
I pass
(µA/cm 2 )
E transpass
(mV vs Ag/AgCl)
0.1 M HNO 3 -125 1.35 × 10 -1 6 × 10 1 1400
0.5 M HNO 3 -100 7.50 × 10 -1 9.5 × 10 1 1345
0.6 M HNO 3 -97 1.01×10 1 11 × 10 1 1330
1 M HNO 3 -75 1.65 ×10 1 1.45 × 10 2 1250
Table. 4.1: Average value of polarization parameters for 304L SS in 0.1 M, 0.5 M, 0.6 M and 1 M
HNO 3 [20].