“…The CPE is defined as the below Eq. (4) 47 :Figure 6Nyquist and Bode diagrams for carbon steel in 1 M HCl solution in the absence and presence of different concentrations of DAEP1 and DAEP2.…”
Present study is designed for the synthesis, characterization and corrosion inhibition behavior of two diamine aromatic epoxy pre-polymers (DAEPs) namely, N
1
,N
1
,N
2
,N
2
-tetrakis (oxiran-2-ylmethyl) benzene-1,2-diamine (DAEP1) and 4-methyl-N
1
,N
1
,N
2
,N
2
-tetrakis (oxiran-2-ylmethyl) benzene-1,2-diamine (DAEP2) for carbon steel corrosion in acidic medium. Synthesized DAEPs were characterized using spectral (Nuclear magnetic resonance (
1
H NMR) and Fourier transform infrared-attenuated total reflection (FTIR-ATR)) techniques. Viscosity studies carried out at four different temperatures (20–80 °C) increase in temperature causes significant reduction in their viscosities. The anticorrosive properties of DAEPs differing in the nature of substituents, for carbon steel corrosion in 1 M HCl solution was evaluated using several experimental and computational techniques. Both experimental and computational studies showed that inhibitor (DAEP2) that contains electron releasing methyl (-CH
3
) showed higher protectiveness as compared to the inhibitor (DAEP1) without substituent (-H). Electrochemical results demonstrate that DAEPs act as reasonably good inhibitors for carbon steel in 1 M HCl medium and their effectiveness followed the sequence: DAEP2 (92.9%) > DAEP1 (91.7%). The PDP results show that the diamine aromatic epoxy pre-polymers molecules (DAEPs) act as mixed type inhibitors. Electrochemical study was also supported using scanning electron microscopy (SEM) method were significant improvement in the surface morphology of inhibited (by DAEPs) metallic specimens was obtained. Results derived from computational density functional theory (DFT) and molecular dynamics (MD) simulationsand studies were consistent with the experimental results derived from SEM, EIS and PDP electrochemical studies. Adsorption of the DAEPs obeyed the Langmuir adsorption isotherm model.
“…The CPE is defined as the below Eq. (4) 47 :Figure 6Nyquist and Bode diagrams for carbon steel in 1 M HCl solution in the absence and presence of different concentrations of DAEP1 and DAEP2.…”
Present study is designed for the synthesis, characterization and corrosion inhibition behavior of two diamine aromatic epoxy pre-polymers (DAEPs) namely, N
1
,N
1
,N
2
,N
2
-tetrakis (oxiran-2-ylmethyl) benzene-1,2-diamine (DAEP1) and 4-methyl-N
1
,N
1
,N
2
,N
2
-tetrakis (oxiran-2-ylmethyl) benzene-1,2-diamine (DAEP2) for carbon steel corrosion in acidic medium. Synthesized DAEPs were characterized using spectral (Nuclear magnetic resonance (
1
H NMR) and Fourier transform infrared-attenuated total reflection (FTIR-ATR)) techniques. Viscosity studies carried out at four different temperatures (20–80 °C) increase in temperature causes significant reduction in their viscosities. The anticorrosive properties of DAEPs differing in the nature of substituents, for carbon steel corrosion in 1 M HCl solution was evaluated using several experimental and computational techniques. Both experimental and computational studies showed that inhibitor (DAEP2) that contains electron releasing methyl (-CH
3
) showed higher protectiveness as compared to the inhibitor (DAEP1) without substituent (-H). Electrochemical results demonstrate that DAEPs act as reasonably good inhibitors for carbon steel in 1 M HCl medium and their effectiveness followed the sequence: DAEP2 (92.9%) > DAEP1 (91.7%). The PDP results show that the diamine aromatic epoxy pre-polymers molecules (DAEPs) act as mixed type inhibitors. Electrochemical study was also supported using scanning electron microscopy (SEM) method were significant improvement in the surface morphology of inhibited (by DAEPs) metallic specimens was obtained. Results derived from computational density functional theory (DFT) and molecular dynamics (MD) simulationsand studies were consistent with the experimental results derived from SEM, EIS and PDP electrochemical studies. Adsorption of the DAEPs obeyed the Langmuir adsorption isotherm model.
“…The carbon steel sheet was the working electrode (WE) and the working area was 1 cm 2 , the platinum wire electrode (area of 1 cm 2 ) was the auxiliary electrode (CE), and a saturated calomel electrode (SCE) was the reference electrode (RE). 37 At 25 C, electrochemical impedance spectroscopy (EIS) was performed by a sine wave with 5 mV signal amplitude, the angular frequency is from 100 000 Hz to 0.01 Hz and the sensitivity is automatically adjusted for sensitivity. Before each set of experiments, the WE was immersed in 3.5 wt% NaCl corrosion solution for 2400 s until the system reached a stable state and obtained the value of open circuit potential (E OCP ).…”
Section: Electrochemical Testmentioning
confidence: 99%
“…Aer establishing the equilibrium state E OCP , electrochemical impedance spectroscopy (EIS) measurements were performed. 37 The electrochemical parameters for the EIS were matched by the ZView impedance tting soware. 38…”
Two unreported metal–organic frameworks [Cu(6-Me-2,3-pydc)(1,10-phen)·7H2O]n (namely Cu-MOF) and [Mn2(2,2′-bca)2(H2O)2]n (namely Mn-MOF) were synthesized and characterized. Cu-MOF and Mn-MOF all can form a three-dimensional structure.
“…Carbon steel, as one of the structural materials widely applied for engineering and daily life, is extremely sensitive to aggressive solutions, which makes it highly susceptible to corrosion during the pickling process. 1,2 To effectively suppress the corrosion of carbon steel in harsh environments to an acceptable range, organic inhibitors with heteroatoms (e.g., nitrogen, oxygen and sulfur), polar functional groups, and/or multiple bonds are generally employed. [3][4][5] However, as their effects on human health, ecology and environment are of great concern, it is urgent to develop effective, safe and eco-friendly corrosion inhibitors.…”
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