An Ecofriendly Initiative for the Corrosion Inhibition of Mild Steel in 1 M HCl Using Tecoma capensis Flower Extract

Table 1

Electrochemical impedance parameters for corrosion of MS in the absence and presence of TCF in 1 M HCl.

S. number	Conc. of TCF in %	Tafel polarisation parameters					Linear polarisation resistance parameters		⁢Impedance parameters
		mV/SCE	A/cm^2	mV/decade	mV/decade	IE; (%)	Ohm/cm^2	IE; (%)	(Ω cm^2)	(Ω cm^2)	IE; (%)	(μF/cm^2)
1	Blank	−475	0.0035	90	152	—	85.5	—	0.830	15.2	—	789
2	0.1	−433	0.0030	98	108	14.3	102	16.2	−0.13	19.4	21.6	631	0.20
3	0.2	−514	0.0015	95	129	57.1	159	46.2	1.59	27.4	44.5	617	0.22
4	0.3	−522	0.0013	99	134	62.9	168	49.1	1.67	32.8	53.7	548	0.31
5	0.4	−499	0.0013	88	138	62.9	198	56.8	1.89	61.9	75.4	411	0.48
6	0.5	−458	0.0013	94	127	62.9	278	69.2	1.78	65.4	76.8	320	0.59
7	0.6	−470	0.0011	85	129	68.6	321	73.4	2.01	78.2	80.6	265	0.66
8	0.7	−423	0.0010	84	128	71.4	386	77.9	1.60	103.1	82.9	219	0.72