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 1

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

S. no.	Conc.; (ppm)	𝐸corr; (mV)	𝐼corr; (𝜇A)	IE; (%)	𝑅𝑝; (ohms)	IE; (%)	𝑏𝑎	𝑏𝑐	Corrosion rate; (mpy)
1	Blank	−586	48.44		636		97.8	608	22.070
2	300	−529	38.64	35	815	21.96	100	313	17.58
3	500	−626	26	56.275	1525	58.30	80	151	11.917
4	600	−382	27.253	54.167	2026	68.61	83	217	12.397
5	700	−412	15	74.774	1154	81.45	81	147	7
6	800	−437	15.76	73.496	1180	85.53	87	98	7.100
7	900	−438	12.006	79.809	1047	64.62	89	76	5