1

Supporting Information

Graphene oxide modified polyaniline pigment for epoxy based anti-corrosion coatings

Nyquist plots

Table 1 : Impedance parameters obtained from Nyquist plots

Sample / Immersion time / Zreal
h / kΩ-cm2
PANIpainted low carbon steel / Just after immersion / 2.29
24 / 3.62
48 / 2.42
72 / 2.31
96 / 1.73
PG1 painted low carbon steel / Just after immersion / 592.50
24 / 4.94
48 / 1422.0
72 / 177.00
96 / 32.04
PG5 painted low carbon steel / Just after immersion / 119.3
24 / 9.256
48 / 2040.3
72 / 0.752
96 / 0.815
PG15 painted low carbon steel / Just after immersion / 77.38
24 / 1.26
48 / 0.751
72 / 0.591
96 / 0.521
Pure GO painted low carbon steel / Just after immersion / 0.698
24 / 3.541
48 / 2.18
72 / 1.92
96 / 1.64
Red oxide painted low carbon steel / Just after immersion / 19.47
24 / 6.683
48 / 4.35
72 / 3.18
96 / 2.54
Without pigment painted low carbon steel / Just after immersion / 28.07
24 / 3.06
48 / 2.22
72 / 1.50
96 / 1.48

Fig. S1. Nyquist plot low carbon steel coated PG1 based painted steel just after immersion in 3.5 mass % NaCl solution

Fig S2. Nyquist plot low carbon steel coated PG1 based painted steel immersed for 24 hours in 3.5 mass % NaCl solution

Fig S3. Nyquist plot low carbon steel coated PG1 based painted steel immersed for 48 hours in 3.5 mass % NaCl solution

Fig. S4. Nyquist plot low carbon steel coated PG1based painted steel immersed for 72 hours in 3.5 mass % NaCl solution

Fig S5. Nyquist plot low carbon steel coated PG1based painted steel immersed for 96 hours in 3.5 mass % NaCl solution

Fig S6. Nyquist plot low carbon steel coated PG5 based painted steel just after immersion, in 3.5 mass % NaCl solution

Fig. S7. Nyquist plot low carbon steel coated PG5 based painted steel for 24 hours in 3.5 mass % NaCl solution

Fig. S8 Nyquist plot low carbon steel coated PG5 based painted steel for 48 hours in 3.5 mass % NaCl solution

Fig. S9 Nyquist plot low carbon steel coated PG5 based painted steel for 96 hours in 3.5 mass % NaCl solution

Fig. S10 Nyquist plot low carbon steel coated PG15 based painted steel just after immersion, in 3.5 mass % NaCl solution

Fig. S11 Nyquist plot low carbon steel coated PG15 based painted steel for just after immersion, after 48, 72 and 96 hours in 3.5 mass % NaCl solution

Fig. S12 Nyquist plot low carbon steel coated PG15 based painted steel just after immersion, after 24, 48 hours in 3.5 mass % NaCl solution

Fig. S13 Nyquist plot low carbon steel coated PG15 based painted steel for after 72 and 96 hours in 3.5 mass % NaCl solution

Fig. S14 Nyquist plot low carbon steel coated pure GO based painted steel just after immersion, 72 and 96 hours in 3.5 mass % NaCl solution

Fig. S15 Nyquist plot low carbon steel coated pure GO based painted steel for just after immersion, 24 and 48 hours in 3.5 mass % NaCl solution

Fig. S16 Nyquist plot low carbon steel coated pure GO based painted steel just after immersion, in 3.5 mass % NaCl solution

Fig. S17 Nyquist plot low carbon steel coated pure GO based painted steel after 24 and 48 hours in 3.5 mass % NaCl solution

Fig. S18 Nyquist plot low carbon steel coated red oxide based painted steel after 72 and 96 hours in 3.5 mass % NaCl solution

Fig. S.19 Nyquist plot low carbon steel coated without pigment based painted steel just after immersion in 3.5 mass % NaCl solution

Fig. S.20 Nyquist plot low carbon steel coated without pigment based painted steel after 24 hour in 3.5 mass % NaCl solution

Fig. S21 Nyquist plot low carbon steel coated without pigment based painted steel after 48 , 72 and 96 hours in 3.5 mass % NaCl solution