Evaluation of Corrosion Resistance of Corrosion Inhibitors for Concrete Structures by Electrochemical Testing in Saturated Ca(OH)₂ Solutions with NaCl and Na₂SO₄

Table 4

Polarization resistance of steel specimens and Efficiency of inhibitors exposed in saturated Ca(OH)₂ solution 0.98 g/L NaCl and different concentrations of Na₂SO₄.

Inhibitors	Concentration of NaCl (g/L)	Concentration of NaSO4 (g/L)	Concentration of inhibitor (g/L)	Polarization resistance, Rpore (Ω·cm^2)	Efficiency, η (%)
None	0.98	0.89	0.00	4356
		1.77		3227
Lithium nitrite (LiNO2)		0.89	2.04	14219	69.36
		1.77		13407	75.93
Diethanolamine (HN(CH2CH2OH)2)		0.89	0.51	7249	39.91
		1.77		5018	35.69
Methyl diethanolamine (C₅H₁₃NO₂)		0.89	0.50	14093	69.09
		1.77		9512	66.07
4-Aminobutyric acid (H2N(CH2)3COOH)		0.89	0.38	19623	77.80
		1.77		10044	67.87