ACS Applied Nano Materials
·
2018
·
IF 0
Lu Shen,Yong Li,Wenjie Zhao,Lijing Miao,Weiping Xie,Huanming Lu,Kui Wang
In order to hold the excellent corrosion resistance of zinc-rich epoxy coatings with reduced zinc content, five types of graphene modified zinc-rich epoxy coatings (G-ZRCs) were prepared. The effect of zinc content on the corrosion protection behaviors of G-ZRCs was investigated using electrochemical impedance spectroscopy (EIS). Open circuit potential (OCP) was also utilized to deepen the understanding of the anticorrosion mechanism of the as-prepared composite coatings. The results confirmed that addition of 0.3 wt % graphene could make the coating with 40 wt % (G-40ZRC) and 55 wt % zinc (G-55ZRC) provide cathodic protection for a short period of time. The EIS and OCP results showed a dominant physical barrier protection mechanism for the coatings without zinc (G-ZRC), while there was a mixed mechanism for G-40ZRC and G-55ZRC and a dominant cathodic protection mechanism for the coatings with 70 and 85 wt % zinc (G-70ZRC and G-85ZRC). Furthermore, the graphene modified zinc-rich coatings and corresponding corrosion products immersed in a 3.5% NaCl solution for 100 days were also characterized, which could further reveal anticorrosion mechanisms of the graphene modified zinc-rich coatings and the passivation effect of polyaniline (PANI).
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
International Journal of Electrochemical Science
·
2023
·Vol. 11
·期 12
·10135-10149
·
IF 1.5
Lijuan Gong,Kangquan Qiao
The corrosion inhibition performances of Diantipyrylmethane (DAM) for mild steel in 0.5 M H 2 SO 4 were investigated using weight loss, electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, scanning electron microscope (SEM) and quantum chemical calculation. The obtained results reveal that DAM acts as a mixed-type inhibitor with a predominantly anodic reaction, and the inhibition efficiency increases with increasing inhibitor concentration whereas decreases with increasing temperature. The adsorption of DAM on steel surface is found to obey Langmuir isotherm, and the adsorption mechanism is mixed physical and chemical adsorption. The results of quantum chemical calculation demonstrate that pyrazolone rings within molecular structure of DAM play a dominant role in corrosion inhibition of mild steel.
研究领域:
材料腐蚀与防护
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物理化学
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电化学
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表面科学
·
量子化学
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 11
·期 8
·7066-7075
·
IF 1.5
Jiheng Ding,Hongran Zhao,Lin Gu,Shengpei Su,Haibin Yu
This paper reports the synthesis of waterborne epoxy phosphate emulsion (WEP) through the reaction between epoxy resin E44 and phosphoric acid and ammonia neutralization. Synthesized WEP was characterized by FTIR for the confirmation of reaction between epoxy groups and phosphoric acid and SEM for morphology. WEP acted as a modifier in two-component epoxy anticorrosion coating on rusty steel substrate. The anticorrosion properties of the coating on rusty steel were investigated by electrochemical impedance spectroscopy (EIS) and Tafel polarization curve. Tafel polarization curve revealed that waterborne epoxy coating containing WEP had better protection ability which is clearly reflected by the protection efficiency (96.6%). EIS study also showed the higher impedance value for WEP containing coating as compared to pure waterborne epoxy coating.
研究领域:
材料科学
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腐蚀与防护
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高分子化学
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表面工程
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电化学
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 13
·期 2
·1985-2000
·
IF 1.5
Zhe Zhang,Le Ruan,Weipeng Zhang,Yuzeng Lyu,Wei Shang,Yuqing Wen,Xiuying Li,Ling Wu,Yanni Jiao
The triazol-3-ylamine and three different kinds of Schiff base compounds are self-assembled on bronze surface. Electrochemical impedance spectroscopy and potentiodynamic polarization measurements show that the triazol-3-ylamine and Schiff base self-assembled films can protect bronze from corrosion in 0.5 M HCl solution. The corrosion efficiency increases with the self-assembly time increasing and reaches a stable value after 8 h. The highest corrosion efficiency of the bronze electrode modified with self-assembled films reaches 95.81% after immersing in 0.005 M 2,4-Dibromo-6-[(4H-[1,2,4]Triazol-3-ylimino)-methyl]-phenol Schiff base solution for 10 h. X-ray photoelectron spectroscopy and scanning electrochemical microscope are used to characterize the inhibitive ability of the self-assembled films. Quantum chemical calculations and dynamic simulations indicate that the triazol-3-ylamine and Schiff bases molecules can absorb on the copper surface via chemisorption. The adsorption energy increases with the number of aromatic rings.
研究领域:
材料腐蚀与防护
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物理化学
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表面科学
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电化学
·
计算化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 4
·2887-2894
·
IF 2.22
Liu Yuan,Gu Yi-Jing,Deng Jia-Li,Luo Gui-Yang,Wu Fu-Zhong,Mai Yi,Dai Xin-Yi,Li Jun-Qi
A series of LiFe 1− x Mn x PO 4 /C composites were successfully synthesized through a simple hydrothermal method. The effects of doped Mn on their micro-structures and electrochemical performances were investigated. The XRD results indicate that Mn doping cannot change the olivine lattice type of LiFePO 4 . Appropriate Mn doping can reduce the particle size of LiFePO 4 . The electrochemical performance data show that the electrochemical performances of the composite materials are enhanced at first and then decrease as the doping amount of Mn increases. Both the CV and EIS results illustrate that a small amount of doped Mn will reduce the electrode polarization and electrochemical impedance of the samples and simultaneously improve the electrochemical performance. Among all the samples, the LiFe 0.98 Mn 0.02 PO 4 /C sample has a desirable electrochemical performance, with its specific discharge capacity reaching 156.0 mAh g −1 at a rate of 0.1 C. Even at a high rate of 5 C, it can still reach 110.0 mAh g −1 . All the results indicate that an appropriate amount of doped Mn has an emphatic effect on the electrochemical performance of LiFePO 4 /C.
研究领域:
材料科学
·
电化学
·
能源存储
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无机化学
·
纳米材料
·
固态化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2017
·
IF 3.012
Y.X. Wei,Y.B. Ma,M. Chen,W.M. Liu,L. Li,Y. Yan
Electrochromic devices (ECDs) based on WO 3 and Ti doped V 2 O 5 films are fabricated by using lithium (LiClO 4 ) liquid electrolyte containing ferrocene redox couple . The addition of ferrocene in electrolyte enhances electrochromic properties of device. The device based on LiClO 4 -Ferrocene electrolyte has larger charge density than that based on LiClO 4 electrolyte. In the 600–1500 nm wavelength range, the transmittance of colored device is under 2% and it has faster coloring response. At 680 nm wavelength, it shows larger changes in transmittance from 68% to 1.8% while device based on LiClO 4 electrolyte changes transmittance from 68.3% to 11.5%. The cycling data reveal that device based on LiClO 4 -Ferrocene electrolyte can yield more stable electrochromic properties at 65 °C than room temperature. In order to deeper understand the effect of electrolyte on films and devices, electrochemical impedance spectroscopy (EIS) and the voltage distribution of films based on an analog cell are separately measured and analyzed in LiClO 4 and LiClO 4 -Ferrocene electrolytes. Results indicate that compared with LiClO 4 electrolyte, films have lower charge-transfer resistance and the distributed voltage on Ti doped V 2 O 5 film is larger in LiClO 4 -Ferrocene electrolyte, which can enhance optical properties of ECD by improving charge density of Ti doped V 2 O 5 film.
研究领域:
材料科学
·
电化学
·
功能材料
·
纳米科技
·
能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2022
·
IF 3.841
Qi Wang,Shaopeng Fu,Xingyao Yang,Qinghao Sun,Junwei Zhang,Yichun Peng,Rongling Zhang,Zezhou Liang,Jianfeng Li
An organic nitrogen/oxygen-rich polymer (PFN-NDIN) was prepared via Suzuki reaction between 2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9,9-bis(3-N,N- dimethylaminopropyl)-9H-fluorene (FNB) and 4,9-dibromo-2,7-bis(3-(dimethyl-amino)propyl)naphthalenediimide (NDINBr 2 ) and utilized as a new inhibitor for HRB400 steels corrosion in alkaline medium of simulated concrete pore solution. The inhibition efficiency of this inhibitor was evaluated by electrochemical techniques. The electrochemical impedance spectroscopy (EIS) results showed that the protective capacity of PFN-NDIN on HRB400 steel increased with increasing concentration to attain 92.85% efficacy with 400 ppm at 288 K. Potentiodynamic polarization (PDP) plots indicated that PFN-NDIN is effective and acts as a hybrid inhibitor. The adsorption behavior of PFN-NDIN was fitted and found to follow the Langmuir isothermal adsorption line, with discussion of the relevant thermodynamic parameters. The effect of temperature on this inhibitor's the rust-inhibiting effect was investigated. The surface was then studied, showing that the interfacial corrosion of HRB400 steel was inhibited by PFN-NDIN molecules. The relationship between PFN-NDIN molecules’ structure and the inhibition efficiency was investigated by quantum chemical calculations. Several parameters were calculated, the findings revealed that the prepared materials correlated well with their electronic contribution capability.
研究领域:
材料腐蚀与防护
·
高分子化学
·
电化学
·
建筑材料科学
·
表面科学
·
量子化学
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2018
·
IF 2.955
Yuhua Dong,Siyi Li,Qiong Zhou
The self–healing capability of epoxy coatings modified with coaxial core–shell nanofibers loaded with the corrosion inhibitor 2–mercaptobenzothiazole (MBT) was investigated using electrochemical techniques. The polyvinyl alcohol/polyvinylidene fluoride core–shell nanofibers were prepared by coaxial electrospinning. Electrochemical impedance results showed that the MBT–loaded coaxial nanofibers improved the barrier properties and decreased the corrosion activity of the coatings. Results of the Scanning Kelvin Probe technique revealed that the MBT–loaded coaxial nanofibers healed corrosion over artificial defects exposed to NaCl electrolytes. These results indicate that adding MBT–loaded coaxial nanofibers to epoxy coatings is a promising strategy toward the development of self–healing epoxy coatings.
研究领域:
材料科学
·
高分子化学
·
腐蚀与防护
·
表面工程
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2013
·Vol. 66
·期 1
·133-138
·
IF 1.66
Peng Shusen,Zhao Wenjie,Zeng Zhixiang,Li He,Xue Qunji,Wu Xuedong
In this report, hybrid silica sol–gel coating was prepared using Ce(NO 3 ) 3 (Sol-Ce) as catalyst. Structure, surface morphology and anticorrosion ability of Sol-Ce solution/coating were studied by infrared spectroscopy (IR), scanning electron microscopy, energy dispersive spectrometer (EDS), potentiodynamic scan (PDS) and electrochemical impedance spectroscopy (EIS). IR results showed that Ce(NO 3 ) 3 had a stronger influence on reactivity of alkoxysilane. EDS results revealed that the fraction of Fe in Sol-Ce coating was significantly lower than regular acid-catalyzed hybrid silica sol–gel coating (Sol-Ac) and Sol-Ac with Ce(NO 3 ) 3 -doped coating (Sol-Ac/Ce). The results of PDS and EIS demonstrated that Sol-Ce coating had better anticorrosion ability than Sol-Ac and Sol-Ac/Ce on carbon steel. The enhanced anticorrosion performance of the Sol-Ce coating might result from the following two reasons: (a) Ce(NO 3 ) 3 as a catalyst could alleviate the negative effects of low pH with using acid catalyst (dissolution of carbon steel) and (b) Ce(NO 3 ) 3 could impede corrosion of carbon steel as corrosion inhibitor.
研究领域:
材料科学
·
表面工程
·
腐蚀与防护
·
无机化学
·
电化学
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2020
·
IF 4.469
Haihua Wang,Wenjing Zhang,Yongning Ma,Guiqiang Fei,Huan Wen,Liyu Sun,Yanming Shao,Yong-Mook Kang
The compatibility between polypyrrole (PPy) and waterborne epoxy coating (EP) remains the main challenge. Here, phosphorylated poly (vinyl alcohol) (PPVA) and p-toluene sulfonic acid sodium (p-TSA) were simultaneously utilized as dopants to modify PPy and prepare water dispersible PPVA/p-TSA/PPy (PPVAT/PPy) solution. Additionally, poly (vinyl alcohol) (PVA) and TSA were also adopted to prepare PVA/p-TSA/PPy (PVAT/PPy) for comparison. Denser film with granular morphology was observed for PPVAT/PPy nanocomposite film. Compared with PVAT/PPy-40 %, the tensile strength of PPVAT-8.0 %/PPy-40 % increased from 248.8–283.9 MPa. PPVAT/PPy displayed higher compatibility and interactions with EP compared to PPy-TSA and PVAT/PPy. Compared with EP, the impedance modulus of PVAT/PPy+EP and PPVAT/PPy+EP increased from 3.17×10 5 to 1.07×10 8 and 1.62×10 9 Ω·cm 2 ; corrosion current density I corr decreased from 1.49×10 −6 to 7.72×10 -8 and 4.01×10 -9 A·cm -2 ; corrosion potential E corr displayed a positive shift of 230 mV and 269 mV, respectively. The corrosion inhibition efficiency of PPVAT/PPy+EP reached 99.83 %, which is much higher than that of PVAT/PPy+EP (93.97 %). PPVAT/PPy+EP nanocomposite coating has been proved to have preferable long-term corrosion resistance based on electrochemical impedance spectra (EIS), polarization curves and salt water spray test. The simultaneous incorporation of phosphate anions, sulfate ions and PPy into EP was beneficial to fabricate high-performance anticorrosion coating.
研究领域:
材料科学
·
高分子化学
·
腐蚀防护
·
纳米复合材料
·
表面工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2013
·
IF 4.675
Ying Yang,Pengfei Yi,Conghua Zhou,Jiarui Cui,Xiaolu Zheng,Si Xiao,Xueyi Guo,Wenyong Wang
In this work we investigate novel, agarose-based polymer electrolyte that is modified by magnetic NiO nanoparticles for solid-state dye-sensitized solar cells (DSSCs) applications. After proper treatment under an external magnetic field , the agarose electrolyte exhibits increased ionic conductivity and better penetration into the mesoporous TiO 2 photoanode film, which improves the power conversion efficiency of the DSSCs. Electrochemical impedance spectroscopy measurement is also performed to analyze the magnetic field effect on cell performance. After applying proper magnetic filed intensity, the recombination resistance and redox transport resistance in the devices are improved. This method can be possibly applied to other solid-state electrolyte materials to improve their performance and can lead to more efficient DSSCs.
研究领域:
材料科学
·
能源化学
·
纳米科技
·
光电功能材料
·
可再生能源
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）