RESEARCH ON CHEMICAL INTERMEDIATES
·
2014
·Vol. 41
·期 10
·7073-7093
·
IF 1.54
Lv T. M.,Zhu S. H.,Guo L.,Zhang S. T.
The inhibiting effect of indole on the corrosion of mild steel Q235 in 0.1 M H 2 SO 4 was investigated through different approaches including weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), scanning electron microscope experiments, and theoretical calculations. Polarization curves reveal that the indole acts as a mixed-type inhibitor and the reaction mechanism in respect of either hydrogen evolution or mild steel dissolution has not been modified. EIS results imply that the water molecules adsorbed on the steel surface are substituted by the indole molecules and the inhibiting behavior of indole is probably due to the formation of an adsorptive film on the steel surface. Thus the thermodynamic and kinetic parameters are determined and discussed to give better understanding of the adsorption process. Theoretical calculations are also discussed in light of the optimized molecular structure of indole to gain further insight of the inhibition mechanism.
研究领域:
材料科学
·
电化学
·
理论计算
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Qiang Wang,Zhihao Shen,Qiuxia Wang,Chuanqi Li,Haidong Jia,Han Sun,Pingan Pei,Chang Shan,Liangyu Wu,Yifan Luo,Han Jia,Pan Huang
Great aqueous dispersibility, a large specific surface area, and high impermeability make graphene oxide (GO) the ideal candidate for a high-performance corrosion inhibitor. Numerous symmetrical modification methods have been reported to enhance the adsorption of GO on metal surfaces in various corrosive media. This work aims to investigate the enhancement and mechanism of unilateral hydrophobic modification on the corrosion inhibition performance of GO. In this study, amphiphilic Janus GO (JGO) was prepared by grafting hydrophobic alkyl chains on one side of GO, and its anticorrosion performance was evaluated via weight loss experiments and electrochemical tests. The results revealed that the corrosion inhibition efficiency for Q235 mild steel (MS) in a 1 M HCl aqueous solution of 25 ppm JGO (81.08%) was much higher than that of GO at the same concentration (22.12%). Furthermore, the Langmuir adsorption isotherm and computational study demonstrated that the synergistic effect of physical adsorption and chemical adsorption promoted the hydrophilic side of JGO close to the surface of the metal, and the dense protective layer was formed by the hydrophobic chains toward the corrosive medium, which effectively hindered the corrosion of MS by the acidic liquid. This study emphasizes the significant role of asymmetrically modified hydrophobic alkyl chains in improving the corrosion prevention performance of GO and provides a perspective for the structural design of GO-based corrosion inhibitors.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOM
·
2019
·Vol. 72
·期 12
·4288-4295
·
IF 2.305
Zhang Jia-Wei,Li Ying,Ding Yu-Shi,Pan Ke-Feng,Zhao Qing
Poly( o -phenylenediamine) was synthesized in different inorganic acid media, hydrochloric (HCl), nitric (HNO 3 ), and phosphoric acid (H 3 PO 4 ).
The aim was to investigate the protective effect of doped coatings on mild steel in an aggressive environment. The synthesized doped-PoPD products were characterized by x-ray diffractometry, Fourier transform infrared spectroscopy, scanning electron microscopy, and cyclic voltammetry. The inhibition abilities of doped coatings were evaluated by potentiodynamic polarization measurements and electrochemical impedance spectroscopy in 3.5% NaCl solution. In the present article, the lowest corrosion current and highest protection efficiency of the doped polymer were observed for the polymer synthesized in HNO 3 medium. The results showed that good protection of mild steel can be achieved by PoPD coating doped with inorganic acid in 3.5% NaCl solution.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
CORROSION SCIENCE
·
2019
·
IF 6.355
Chen-Xiang Wang,Xue-Fen Zhang
In this work, non-particle and fluorine-free superhydrophobic films were constructed on mild steel (MS) for corrosion protection by one-step electrodeposition from dodecyltrimethoxysilane (DTMS)-contained precursor solution. The superhydrophobicity was achieved by the generated micro/nanostructure of hydrophobic DTMS during electrodeposition. The superhydrophobic films exhibited long-term stability to air atmosphere. The protective performance in 3.5 wt. % NaCl solution was estimated by potentiodynamic polarization technique, by electrochemical impedance spectroscopy, by monitoring water contact angle changes and by iron dissolution examination. The results show that the superhydrophobic films exhibit remarkable enhanced anticorrosion performance for MS with a promising inhibition efficiency of 99.74%.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Ahmed H. Tantawy,Kamal A. Soliman,Hany M. Abd El-Lateef
Three novel quaternary bisammonium fluorosurfactants (FGS-4, FGS-6, and FGS-8) were designed and synthesized using furan-2,5-diylbis(methylene) bis(2-bromoacetate) with N-(3-(dimethylamino)propyl)-1,1,2,2,3,3,4,4,4-nonafluoroalkan-1-sulfonamide through a heterocyclic spacer of 3,3′-((furan-2,5-diylbis(methylene))bis(oxy))bis(3-oxopropan-1-ylium) to connect two fluorocarbon tails. Their corrosion protection characteristics of mild steel/1.0 M H 2 SO 4 solution interface at different temperatures were inspected by electrochemical (PDP and EIS) and weight loss measurements. The PDP plots established that the three-quaternary bisammonium fluorosurfactants are mixed-type inhibitors; EIS experiments exhibited that the as-prepared surfactants possess the superior protection capacities of 93.5 % (FGS-4), 95.5 % (FGS-6), and 96.6 % (FGS-8) at the optimum dose of 2.00 mmol L −1 . The Adsorption considerations showed that the three additives demonstrated both the physisorption and chemisorption mechanisms and followed the Langmuir model. Surface morphology investigations indicated that the synthesized fluorocarbon surfactants impeded mild steel corrosion. The relationships between the protection performance of the fluorocarbon surfactants, their molecular configurations, and the adsorption mode were checked by DFT calculations and MD simulations, which confirmed that FGS-8 has a higher protection power than FGS-4 and FGS-6. The current investigation exhibited that quaternary bisammonium fluorosurfactants could be used as eco-friendly, economic, and efficient inhibitors for mild steel corrosion with the probable for extensive applications.
研究领域:
材料化学
·
电化学
·
计算化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）