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 2

Polarisation parameters obtained for MS in 3.5% NaCl in the presence of various concentrations of Pec-g-PAA.

S. no.	Conc.; (ppm)	𝐸corr; (mV)	𝐼corr; (𝜇A)	IE; (%)	𝑅𝑝; (ohms)	IE; (%)	𝑏𝑎	𝑏𝑐	Corrosion rate; (mpy)
1	Blank	−586.7	48.44		636		97.8	608	22.07
2	50	−669	27	44.26	1344	52.68	100	309	12.56
3	100	−748	7.88	83.73	2463	74.18	91	167	3.584
4	200	−792	7.325	84.87	2527	74.83	97	111	3.120
5	300	−786	7.189	85.15	2594	75.48	93	119	3.270
6	400	−691	14.3	70.47	2505	74.61	214	229	6.500
7	500	−880	13.39	52.31	2090	69.57	351	72	7