Table 6: Electrochemical parameter and percentage inhibition efficiency obtained from polarisation studies for N80 steel in 15% HCl solution in the presence or the absence of the inhibitors at 303 K.

InhibitorConcentration (ppm) ( ) (mV dec−1) (mV dec−1) ( A cm−2)% IE

Blank 95135573

20 5510417868.87
50 64 8216072.02
AMPT 100 77 9313476.54
150 157142 9583.37
200 111128 8086.51

20 7414720364.52
50 61 7318268.21
APT 100 53 8415473.21
150 92 9810681.58
200 108 4410382.03

20 6810222960.02
50 75 9120564.05
ACPT 100 88 7917769.07
150 9710813376.81
200 11815611480.07