Water-Soluble and Biodegradable Pectin-Grafted Polyacrylamide and Pectin-Grafted Polyacrylic Acid: Electrochemical Investigation of Corrosion-Inhibition Behaviour on Mild Steel in 3.5% NaCl Media

Table 3

Impedance parameters and inhibition efficiency values for mild steel sample in 3.5% NaCl containing various concentrations of Pec-g-PAAm.

S. no.	Conc.; (ppm)	𝑅𝑠; (ohms)	𝑅𝑝; (ohms)	𝑅ads; (ohms)	Total resistance	IE; (%)	𝐶ads; 10^−4 F	𝐶dl; 10^−3 F	Surface coverage; (𝜃)	𝑊; ohms s^−1/2
1	Blank	2.018	56.25		58.3			3.72
2	300	3.227	269	0.9797	273.2	78.7	3.42	2.30	0.38	122.6
3	500	3.552	294.1	4.853	302.5	80.7	5.47	0.388	0.89	94.15
4	600	3.692	317.9	13.19	334.8	82.6	0.321	0.206	0.94	128.9
5	700	3.102	548.4	12.03	563.5	89.7	0.210	0.182	0.95	101.7
6	800	3.727	491.7	25.32	520.7	88.8	0.666	0.175	0.95	91.69
7	900	3.569	195.4	17.47	216.4	73.1	0.977	0.460	0.87	98