Table 8.

s-Triazine-based corrosion inhibitors: structure, IE% from Tafel plot, maximum dose, adsorption type and isotherm for steel in 1 M HCl; while PTA-1, -2 and -3 in 0.25 M H₂SO₄.

s-triazine derivatives structures	metal/medium	concentration IE%	adsorption isotherm (type)	reference
R1=R2=R3 =	steel/1 M HCl	(250 ppm)	Langmuir (mixed)	[43]
		98.8%
		85.1%
		96.9%
R1=R2=R3 =	mild steel/1 M HCl	(312 ppm) 89.3%	Langmuir (mixed)	[40]
R1 =R3 = NH2NH–; R2 = R2 =	steel/1 M HCl	(225 ppm)	Langmuir (mixed)	[42]
		98%
		97%
R1 = R3 = NH2–NH– ; R2 = CH3O– R1 = NH2–NH– ; R2 = R3 = CH3O– R1 = R2 = R3 = NH2–NH–	steel/1 M HCl	(250 ppm)	Langmuir (mixed)	[44]
		98.0%
		95.9%
		97.7%
R1=R2=R3 = n = 1 n = 2 n = 3 n = 4 n = 5	mild steel/1 M HCl	(5000 ppm) 71.8%	Langmuir (mixed)	[77]
		(5000 ppm) 76.5%
		(5000 ppm) 81.7%
		(2000 ppm) 92.0%
		(500 ppm) 98.4%
R1=R2=R3 =	mild steel/1 M HCl	(5000 ppm) 35.4%	Langmuir (mixed)	[72]
R1=R3= R2 = X = H X = Br X = OCH3	C-steel/0.25 M H2SO4	(175 ppm) 79.0%	Frumkin (mixed)	present work
		(120 ppm) 96.5%	Langmuir (mixed)
		(120 ppm) 93.4%	Langmuir (mixed)