Table 2 The electrochemical factor derived from polarization plots of the reinforcing steel in SCP solutions including 3.5 wt.%NaCl and BTC inhibitor concentrations of 12, 24, 37, 50 μmol L⁻¹ at pH values of 12.5, 10 and 7.

pH values	Inhibitor concertation (µmol L⁻¹)	i_corr (µA cm⁻²)	i_pit (µA cm⁻²)	E_pit (mV) SCE	E_corr (mV) SCE	E_pit-E_cor (mV) SCE	Bc (V decade⁻¹)	Ba (V decade⁻¹)	R_p Ω cm²	IE%	surface coverage (ϴ)
12.5	Blank	13	2.0 × 10⁻⁴	−0.41	−0.601	0.187	0.11	0.076	1502	—	—
	12	5.2	6.7 × 10⁻⁵	−0.34	−0.598	0.254	0.081	0.061	2888	56	0.56
	24	3.2	5.0 × 10⁻⁵	−0.33	−0.601	0.271	0.077	0.059	4590	76	0.76
	37	2.5	4.2 × 10⁻⁵	−0.28	−0.602	0.322	0.072	0.056	5471	81	0.81
	50	1.6	3.9 × 10⁻⁵	−0.21	−0.594	0.384	0.068	0.048	7636	88	0.88
10	Blank	20	—	—	−0.71	—	0.091	0.091	988	—	—
	12	15	—	—	−0.639	—	0.087	0.081	1214	22	0.22
	24	10	—	—	−0.665	—	0.075	0.079	1671	52	0.52
	37	8	1.23 × 10⁻⁵	—	−0.635	0.058	0.061	0.066	1721	63	0.63
	50	5	9.7 × 10⁻⁵	—	−0.585	0.376	0.058	0.058	2518	78	0.78
7	Blank	33	—	—	—	—	0.098	0.120	709	—	—
	12	28	—	—	—	—	0.087	0.110	755	15	0.15
	24	21	—	—	—	—	0.080	0.109	958	36	0.36
	37	14	—	—	—	—	0.071	0.111	1344	57	0.57
	50	9.5	—	—	—	—	0.116	0.091	2332	71	0.71

Quick links

Search