Corrosion Inhibition Effect of 4-(2-Diethylamino-Ethylsulfonyl)-Phthalonitrile and 4,5-Bis(Hexylsulfonyl)-Phthalonitrile

Table 1

Corrosion values SS in the presence and absence of different concentrations of DAESPN and Bis-HSPN in 3.0 M NaCl medium.

Electrode	Concentration M	𝐸corr mV	𝐼corr  μA	β a, mV/dec	β c, mV/dec	IE%	CR, ×10^3 mmpy
Bare	—	−56	0.418	453.2	93.2	—	5.0
DAESPN	1×10^−3	−116	0.273	406.5	67.9	34.6	3.3
Bis-HSPN	1×10^−3	−4	0.171	358.9	81.4	59.0	2.1
DAESPN	5×10^−3	−135	0.253	354.0	67.8	39.4	3.1
Bis-HSPN	5×10^−3	−75	0.381	823.4	75.2	24.0	4.6
DAESPN	5×10^−4	−55	0.305	636.7	43.8	27.0	3.7
Bis-HSPN	5×10^−4	40	0.226	577.2	24.8	46.0	2.7
DAESPN	1×10^−4	6	0.278	663.4	37.7	33.4	3.3
Bis-HSPN	1×10^−4	18	0.293	1002.8	25.4	30.0	3.5