Table 4: Corrosion parameters, namely, corrosion rate (CR), surface coverage ( ), and inhibition efficiency IE (%) of N80 steel in 15% HCl in the presence and the absence of the inhibitor at different temperatures, obtained from weight loss measurements.

Inhibitor Conc (ppm) 303 K 313 K 323 K333 K
CR (mmpy) IE %CR (mmpy) IE %CR (mmpy) IE %CR (mmpy) IE %

Blank2.6729.084 17.94360.348

200.9830.63263.22.9060.68068.0
4.7190.737
73.7
14.00 0.76876.8
500.8630.67767.72.4160.734 73.4
3.8930.783
78.3
10.00 0.83383.3
AMPT 1000.6730.748 74.81.6070.82382.3
2.4400.864
86.4
6.155 0.89889.8
1500.5290.80280.21.3170.855 85.5
1.9200.893
89.3
5.129 0.91591.5
2000.4460.82382.3 1.0900.88088.0
1.5960.911
91.1
4.586 0.924
92.4

201.0600.60360.33.1480.65365.3
5.6780.683
68.3
16.66 0.72472.4
500.9480.64564.52.8310.68868.8
4.6700.739
73.9
12.69 0.78978.9
APT1000.7900.70470.42.1280.76676.6
3.5830.800
80.0
9.975 0.83983.9
1500.6000.77577.5 1.7690.80580.5
3.0190.832
83.2
8.189 0.864
86.4
2000.5520.79379.31.3490.85185.1
2.4860.86186.1
6.914 0.89489.4

201.1400.57357.3 3.4550.61961.96.2630.65165.1
19.60 0.675
67.5
501.0530.606 60.63.3320.633 63.35.3630.70170.1
14.83 0.754
75.4
ACPT 1000.8690.67467.42.5030.725 72.54.4190.75475.4
12.40 0.794
79.4
1500.7080.73573.5 2.0820.770 77.03.6760.79579.5
10.72 0.822
82.2
2000.6490.75775.71.6370.81981.93.1360.82582.5 8.762 0.85585.5