“…The smaller the value of Δ E (energy gap), the stronger the interaction between inhibitor molecule and the metal surface, the stronger the adsorption fastness, and the better the corrosion inhibition performance of the corresponding inhibitor. [ 34 ] In Table 7, the Δ E value follows HMBA < AMPS < AM < MAA < SMA, which indicates that HMBA plays the largest role in the process of polymer adsorption and film formation, and contributes the most to the inhibition performance.…”
Section: Resultsmentioning confidence: 99%
“…The higher the dipole value, the stronger the dipole–dipole interaction between the corrosion inhibitor and the metal surface, which will enhance the adsorption of inhibitor on the metal surface, and enhance the corrosion inhibition effect. [ 34 ] In Table 7, the dipole value of the five types of monomer molecules had a relationship of AMPS > AM > SMA > MAA > HMBA; it could be inferred that the adsorption performance of the AMPS monomer on the metal surface was better than the others. Therefore, it can be concluded that the hydrophobic association polymer, AMAHS, had a stronger corrosion inhibition effect on mild steel, which was consistent with experimental results.…”
Section: Resultsmentioning confidence: 99%
See 1 more Smart Citation
Rao
1
,
Zhang
2
,
Zhang
3
et al. 2020
A polyacrylamide with capsaicin‐derived monomers (AM–MAA–AMPS–HMBA–SMA; AMAHS) was synthesized and investigated as a novel environment‐friendly polymer inhibitor for Q235 mild steel at 25°C in 1 M HCl solution. The inhibition efficiency was evaluated by weight loss measurements, electrochemical experiments, and surface investigation methods as well as by theoretical calculations. Experimental results indicated that the efficiency of AMAHS was up to 94.86% at the concentration of 2 g/L. Electrochemical tests and surface morphology analysis showed that AMAHS served as a mixed‐type corrosion inhibitor, which could be adsorbed and self‐assembled on the surface of mild steel forming a highly hydrophobic protective film (contact angle of 172°). Density functional theory calculations revealed that heteroatoms in AMAHS, such as O, N, S, are active sites in forming coordination bonds with surface iron atoms. In addition, hydrophobic groups played an important role in protecting the metal surfaces from corrosion media.
“…The smaller the value of Δ E (energy gap), the stronger the interaction between inhibitor molecule and the metal surface, the stronger the adsorption fastness, and the better the corrosion inhibition performance of the corresponding inhibitor. [ 34 ] In Table 7, the Δ E value follows HMBA < AMPS < AM < MAA < SMA, which indicates that HMBA plays the largest role in the process of polymer adsorption and film formation, and contributes the most to the inhibition performance.…”
Section: Resultsmentioning confidence: 99%
“…The higher the dipole value, the stronger the dipole–dipole interaction between the corrosion inhibitor and the metal surface, which will enhance the adsorption of inhibitor on the metal surface, and enhance the corrosion inhibition effect. [ 34 ] In Table 7, the dipole value of the five types of monomer molecules had a relationship of AMPS > AM > SMA > MAA > HMBA; it could be inferred that the adsorption performance of the AMPS monomer on the metal surface was better than the others. Therefore, it can be concluded that the hydrophobic association polymer, AMAHS, had a stronger corrosion inhibition effect on mild steel, which was consistent with experimental results.…”
Section: Resultsmentioning confidence: 99%
Rao
1
,
Zhang
2
,
Zhang
3
et al. 2020
A polyacrylamide with capsaicin‐derived monomers (AM–MAA–AMPS–HMBA–SMA; AMAHS) was synthesized and investigated as a novel environment‐friendly polymer inhibitor for Q235 mild steel at 25°C in 1 M HCl solution. The inhibition efficiency was evaluated by weight loss measurements, electrochemical experiments, and surface investigation methods as well as by theoretical calculations. Experimental results indicated that the efficiency of AMAHS was up to 94.86% at the concentration of 2 g/L. Electrochemical tests and surface morphology analysis showed that AMAHS served as a mixed‐type corrosion inhibitor, which could be adsorbed and self‐assembled on the surface of mild steel forming a highly hydrophobic protective film (contact angle of 172°). Density functional theory calculations revealed that heteroatoms in AMAHS, such as O, N, S, are active sites in forming coordination bonds with surface iron atoms. In addition, hydrophobic groups played an important role in protecting the metal surfaces from corrosion media.
“…The positive values of ∆H* reflects the endothermic nature of the X80 steel dissolution process. These findings revealed that the T. peruviana extracts are highly efficiency for the inhibition of corrosion and could be potential for inhibition of steel corrosion in acidic environment, which is a problematic issue (Alamri and Obot, 2019;Ayukayeva et al, 2019;Bhuvaneshwari et al, 2019;Chauhan et al, 2019;Obot et al, 2019;Pakiet et al, 2019;Qian and Cheng, 2019;Zhang et al, 2019).…”
Section: Rtmentioning confidence: 87%
Int1
2019
Preprint
Aqueous extract of Thevetia peruviana leaves were investigated as corrosion inhibitor for API 5L X80 pipeline steel in 1M H2SO4 solution using electrochemical and gravimetric techniques. The results reveal that T. peruviana inhibited the X80 pipeline steel corrosion in the acid medium in a concentration dependent manner. Potentiodynamic polarization results showed T. peruviana to be a mixed type inhibitor in 1M H2SO4 environment, whereas the impedance results revealed adsorption of the inhibitor species on the steel surface. The gravimetric results reveal that the adsorption mechanism of the inhibitor on the steel surface was chemisorption. The adsorption was in accordance with Freundlich adsorption isotherm and negative standard adsorption energy (Δ𝐺o𝑎𝑑𝑠) obtained inferred that the adsorption was spontaneous and the interaction between the inhibitive molecules was found to be repulsive. Scanning electron microscopy (SEM) confirmed the formation of adsorbed film on the X80 pipeline steel surface. Results revealed that T. peruviana has potential to inhibit the correction and could possibly be used for corrosion inhibition in the acidic environment of steel.
“…The CMCs of synthesised 3-oxa-1,5-pentane- bis ( N -alkyl- N , N -dimethylammonium bromides) were obtained by conductometric titration, creating relationship graphs of the characteristic conductivity in water of the GS as a function of the concentration [ 1 , 63 , 69 , 126 ]. The graphs consist of two lines with differing slopes.…”
Section: Methodsmentioning confidence: 99%
Brycki
1
,
Szulc
2
,
Kowalczyk
3
et al. 2021
Molecules Self Cite
Due to their large possibility of the structure modification, alkylammonium gemini surfactants are a rapidly growing class of compounds. They exhibit significant surface, aggregation and antimicrobial properties. Due to the fact that, in order to achieve the desired utility effect, the minimal concentration of compounds are used, they are in line with the principle of greenolution (green evolution) in chemistry. In this study, we present innovative synthesis of the homologous series of gemini surfactants modified at the spacer by the ether group, i.e., 3-oxa-1,5-pentane-bis(N-alkyl-N,N-dimethylammonium bromides). The critical micelle concentrations were determined. The minimal inhibitory concentrations of the synthesized compounds were determined against bacteria Escherichia coli ATCC 10536 and Staphylococcus aureus ATCC 6538; yeast Candida albicans ATCC 10231; and molds Aspergillus niger ATCC 16401 and Penicillium chrysogenum ATCC 60739. We also investigated the relationship between antimicrobial activity and alkyl chain length or the nature of the spacer. The obtained results indicate that the synthesized compounds are effective microbicides with a broad spectrum of biocidal activity.