Leaves powder

Inhibitor prepared using H2SO4

Corrosion product

Frequency

(cm−1)

Assignment

Frequency (cm−1)

Assignment

Frequency

(cm−1)

Assignment

3281.43

-OH or N-H Stretch

3334.5

O-H Stretch

3329.84

O-H Stretch

2917.52

-C-H

Stretch

1634.65

C=O Stretch

1635.23

C=O Stretch

2849.24

1189.41

C-O or

C-H Stretch

1183.08

C-O or

C-N Stretch

1625.62

C=O stretch

1049.60

1048.00

1405.52

C-H bending

1316.22

1244.02

C-O or C-N stretch

1031.06