Table 2 Potentiodynamic polarization parameters for API X120 steel in 3.5 wt% NaCl solution with CO₂ purging in the presence and the absence of different concentration of PEI corrosion inhibitor under elevated temperature.

T, °C	C_inh µmol L⁻¹	^E_corr (mV) SCE	i_corr (µAcm⁻²)	β_a, mV/decade	βc, mV/decade	CR, mpy	θ	IE, %
20	Blank	−700	81	82.10	347.8	47.04	—	—
	25	−610	36.3	812.2	9089	21.82	0.55	55.18
	50	−642	28.8	1329	781.1	16.73	0.64	64.44
	75	−670	19.3	64.0	910.9	11.25	0.76	76.17
	100	−577	10.9	730.7	201.5	6.35	0.86	86.54
30	Blank	−661	96.9	4209	5111	56.28	—	—
	25	−662	47	80.5	341.5	27.29	0.51	51.49
	50	−690	39.5	84.4	1781	22.94	0.59	59.23
	75	−624	29	64.40	579.6	16.85	0.70	70.07
	100	−664	18.1	54.4	573.8	12.85	0.81	81.32
50	Blank	−638	121	2664	321.4	70.25	—	—
	25	−700	82.9	82.2	5279	38.82	0.31	31.71
	50	−674	68.3	2060	1890	33.89	0.43	43.55
	75	−641	47	72.20	528.3	27.21	0.61	61.15
	100	−675	35.3	105.8	592.6	20.59	0.70	70.82
70	Blank	−680	186	129.7	4389	108.2	—	—
	25	−638	147	107.4	703.8	85.38	0.20	20.96
	50	−653	120.5	1081	158.9	69.985	0.35	35.21
	75	−624	88	71	432.9	51.16	0.52	52.68
	100	−637	64	253.2	9583	37.16	0.65	65.59

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