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Publications (10 of 16) Show all publications
Zhang, F., Örnek, C., Nilsson, J.-O. -. & Pan, J. (2020). Anodisation of aluminium alloy AA7075 – Influence of intermetallic particles on anodic oxide growth. Corrosion Science, 164, Article ID 108319.
Open this publication in new window or tab >>Anodisation of aluminium alloy AA7075 – Influence of intermetallic particles on anodic oxide growth
2020 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 164, article id 108319Article in journal (Refereed) Published
Abstract [en]

Microstructure and Volta-potential analyses were conducted to characterise intermetallic-particles (IMPs) in AA7075-T5. EIS and AFM were applied under operando-conditions to investigate anodisation processes. IMPs have pronounced influence on the growth of anodic aluminium oxide (AAO) films resulting in low charge-transfer resistance. Cu-bearing constituents show cathodic-character, whereas Mg2Si and MgZn2 particles show anodic-character. During anodisation, Al7Cu2Fe remain stable with peripheral-dissolution around boundary. De-alloying of S-phase particles leads to the detachment. Mg2Si undergoes de-alloying at low potential, and re-passivation at high potential. MgZn2 dissolves entirely upon anodization. Localised-dissolution in large-IMPs boundaries or nanometre-sized IMPs facilitates bubble evolution, confirming local breakdown of barrier-layer.

Place, publisher, year, edition, pages
Elsevier Ltd, 2020
Keywords
Anodization, In-situ EC-AFM, Intermetallic particles, Localised dissolution, Operando EIS, SKPFM, Alloying, Alumina, Aluminum alloys, Aluminum oxide, Anodic oxidation, Binary alloys, Charge transfer, Dealloying, Dissolution, Intermetallics, Iron alloys, Oxide films, Silicon alloys, Ternary alloys, Anodizations, Inter-metallic particle, Localised, Operando, Magnesium alloys
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-268382 (URN)10.1016/j.corsci.2019.108319 (DOI)000515204200017 ()2-s2.0-85075390610 (Scopus ID)
Note

QC 20200423

Available from: 2020-04-23 Created: 2020-04-23 Last updated: 2020-04-23Bibliographically approved
Cheng, J., Chen, S., Zhang, F., Shen, B., Lu, X. & Pan, J. (2020). Corrosion- and wear-resistant composite film of graphene and mussel adhesive proteins on carbon steel. Corrosion Science, 164, Article ID 108351.
Open this publication in new window or tab >>Corrosion- and wear-resistant composite film of graphene and mussel adhesive proteins on carbon steel
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2020 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 164, article id 108351Article in journal (Refereed) Published
Abstract [en]

A new strategy was proposed to prepare a composite film using mussel adhesive protein Mefp-1 and graphene to achieve corrosion protection and surface lubrication on carbon steel. The dispersibility of graphene in Mefp-1 solution was firstly investigated and deposition methods of Mefp-1/graphene film were proposed. In-situ confocal Raman micro-spectroscopy and electrochemical impedance spectroscopy measurements were utilized to study the corrosion inhibition effect in NaCl solution. Friction tests were conducted to study the tribological properties. Results show that the Mefp-1/graphene film exhibits strong adhesion to carbon steel, provides improved corrosion- and wear-resistance, and a significantly increased lubricity on carbon steel.

Place, publisher, year, edition, pages
Elsevier Ltd, 2020
Keywords
Carbon steel, Corrosion protection, Graphene, Mussel adhesive protein, Wear resistance, Adhesives, Composite films, Corrosion resistance, Electrochemical corrosion, Electrochemical impedance spectroscopy, Laser beam effects, Molluscs, Proteins, Sodium chloride, Wear of materials, Corrosion and wear resistance, Corrosion and wears, Corrosion inhibition, Deposition methods, Dispersibilities, Electrochemical impedance spectroscopy measurements, Mussel adhesive proteins, Tribological properties, Steel corrosion
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-268544 (URN)10.1016/j.corsci.2019.108351 (DOI)2-s2.0-85076249019 ()2-s2.0-85076249019 (Scopus ID)
Note

QC 20200323

Available from: 2020-03-23 Created: 2020-03-23 Last updated: 2020-03-23Bibliographically approved
Hou, R.-Q. -., Zhang, F., Jiang, P.-L. -., Dong, S.-G. -., Pan, J. & Lin, C.-J. -. (2020). Corrosion inhibition of pre-formed mussel adhesive protein (Mefp-1) film to magnesium alloy. Corrosion Science, 164, Article ID 108309.
Open this publication in new window or tab >>Corrosion inhibition of pre-formed mussel adhesive protein (Mefp-1) film to magnesium alloy
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2020 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 164, article id 108309Article in journal (Refereed) Published
Abstract [en]

A range of ex situ and in situ analytical techniques were applied to gain insights into the formation and properties of the pre-formed Mefp-1 film on magnesium-1.0 wt.% calcium (Mg-1.0Ca) alloy. The results revealed that the Mefp-1 film pre-formed at pH 4.6 shows a net-like structure, whereas it is more packed at pH 8.5. in situ scanning micro-reference electrode technique results demonstrated the Mefp-1 films formed at both pH can effectively inhibit the localised corrosion of Mg-1.0Ca alloy. Moreover, the film pre-formed at pH 4.6 provides an increasing corrosion inhibition to Mg-1.0Ca alloy during 7 days of exposure.

Place, publisher, year, edition, pages
Elsevier Ltd, 2020
Keywords
EIS, Magnesium, Mussel adhesive protein, Scanning reference electrode technique, Adhesives, Binary alloys, Calcium alloys, Corrosion inhibitors, Electrochemical corrosion, Electrodes, Localized corrosion, Molluscs, Proteins, Corrosion inhibition, Gain insight, Localised corrosion, Mussel adhesive proteins, Net-like structures, Reference electrodes, Situ scanning, Magnesium alloys
National Category
Manufacturing, Surface and Joining Technology
Identifiers
urn:nbn:se:kth:diva-268381 (URN)10.1016/j.corsci.2019.108309 (DOI)000515204200007 ()2-s2.0-85075435715 (Scopus ID)
Note

QC 20200424

Available from: 2020-04-24 Created: 2020-04-24 Last updated: 2020-04-24Bibliographically approved
Tan, J., Guo, L., Wu, D., Wang, S., Yu, R., Zhang, F. & Kaya, S. (2020). Electrochemical and Computational Studies on the Corrosion Inhibition of Mild Steel by 1-Hexadecyl-3-methylimidazolium Bromide in HCl Medium. International Journal of Electrochemical Science, 15(3), 1893-1903
Open this publication in new window or tab >>Electrochemical and Computational Studies on the Corrosion Inhibition of Mild Steel by 1-Hexadecyl-3-methylimidazolium Bromide in HCl Medium
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2020 (English)In: International Journal of Electrochemical Science, ISSN 1452-3981, E-ISSN 1452-3981, Vol. 15, no 3, p. 1893-1903Article in journal (Refereed) Published
Abstract [en]

An imidazolium-based ionic liquid, i.e., 1-Hexadecyl-3-methylimidazolium Bromide (HMIBr), was investigated as a corrosion inhibitor candidate for mild steel in 1 M HCl medium using combined electrochemical and molecular simulation methods. Potentiodynamic polarization results show that HMIBr is a mixed-type inhibitor and suppresses the corrosion process effectively at optimum concentration 10(-3) M with 96.9% inhibition efficiency. Electrochemical impedance spectroscopy (EIS) analysis indicated an increase in the charge transfer resistance with enhance of inhibitor concentration, and confirmed the adsorption of HMIBr on the iron surface. Moreover, density functional theory (DFT) calculations, Monte Carlo as well as molecular dynamics simulations were employed to obtain further insights into the antiseptic mechanism. Our findings have important guiding significance for understanding the corrosion inhibition mechanism and designing new ionic liquid-based inhibitor molecules.

Place, publisher, year, edition, pages
ESG, 2020
Keywords
Ionic liquid, Mild steel, Corrosion inhibitor, Electrochemical, Molecular simulation
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-271937 (URN)10.20964/2020.03.36 (DOI)000519545900002 ()2-s2.0-85082101974 (Scopus ID)
Note

QC 20200420

Available from: 2020-04-20 Created: 2020-04-20 Last updated: 2020-04-20Bibliographically approved
Cao, Y., Zheng, D., Luo, J., Zhang, F., Wang, C., Dong, S., . . . Lin, C. (2020). Enhanced corrosion protection by Al surface immobilization of in-situ grown layered double hydroxide films co-intercalated with inhibitors and low surface energy species. Corrosion Science, 164, Article ID 108340.
Open this publication in new window or tab >>Enhanced corrosion protection by Al surface immobilization of in-situ grown layered double hydroxide films co-intercalated with inhibitors and low surface energy species
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2020 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 164, article id 108340Article in journal (Refereed) Published
Abstract [en]

In this work, a novel in-situ grown layered double hydroxide (LDH) film co-intercalated with inhibitors (vanadates) and low surface energy substance (laurates) was immobilized on Al substrates. A long-term monitoring of electrochemical impedance spectra (EIS) of the various samples in 3.5 wt.% NaCl solution demonstrated the synergetic protection of the intercalated two functional species. Meanwhile, the X-ray diffraction (XRD) result of the samples after immersion in NaCl solution for a long time presented the anion-exchange process between vanadates/laurates and chlorides. The synergetic effect of the two species loaded film significantly contributed to the enhanced long-term corrosion protection of aluminum.

Place, publisher, year, edition, pages
Elsevier Ltd, 2020
Keywords
Aluminum, EIS, Interfaces, Neutral inhibition, XRD, Aluminum corrosion, Electrochemical corrosion, Interfaces (materials), Interfacial energy, Sodium chloride, Transition metal compounds, X ray diffraction, Electrochemical impedance spectra, Functional species, Layered double hydroxides, Long term monitoring, Low surface energy, Neutral inhibitions, Surface immobilization, Synergetic effect, Corrosion protection
National Category
Manufacturing, Surface and Joining Technology
Identifiers
urn:nbn:se:kth:diva-268383 (URN)10.1016/j.corsci.2019.108340 (DOI)000515204200030 ()2-s2.0-85075366043 (Scopus ID)
Note

QC 20200424

Available from: 2020-04-24 Created: 2020-04-24 Last updated: 2020-04-24Bibliographically approved
Guo, L., Tan, J., Kaya, S., Leng, S., Li, Q. & Zhang, F. (2020). Multidimensional insights into the corrosion inhibition of 3,3-dithiodipropionic acid on Q235 steel in H2SO4 medium: A combined experimental and in silico investigation. Journal of Colloid and Interface Science, 570, 116-124
Open this publication in new window or tab >>Multidimensional insights into the corrosion inhibition of 3,3-dithiodipropionic acid on Q235 steel in H2SO4 medium: A combined experimental and in silico investigation
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2020 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 570, p. 116-124Article in journal (Refereed) Published
Abstract [en]

3,3-Dithiodipropionic acid (DDA) as a potential corrosion inhibitor for Q235 steel in 0.5 M H2SO4 solution was examined. A variety of research approaches including electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), scanning electron microscopy (SEM), atomic force microscopy (AFM), and computational techniques were employed. The toxicity and solubility of DAA were reasonably assessed. Its inhibition efficiency can reach approximately 93% when the optimal concentration is 5 mM. The results of PDP curves manifest that DDA is a mixed type corrosion inhibitor. EIS data indicate that the charge transfer resistance increases with increasing concentration of DDA. Gibbs free energy obtained from the Langmuir isotherm model suggests that DDA molecules hinder the acid attack mainly by chemisorption. Surface topography analysis strongly confirmed the electrochemical findings. Moreover, the simulation results based on density functional theory (DFT) calculation and molecular dynamics (MD) simulations supported the successful interfacial adsorption of DDA on Fe(1 1 0) surface.

Place, publisher, year, edition, pages
Academic Press, 2020
Keywords
3, 3-Dithiodipropionic acid, Q235 steel, Corrosion inhibition, Electrochemistry, Molecular simulation
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-272931 (URN)10.1016/j.jcis.2020.03.001 (DOI)000525899700013 ()32145651 (PubMedID)2-s2.0-85080116301 (Scopus ID)
Note

QC 20200525

Available from: 2020-05-25 Created: 2020-05-25 Last updated: 2020-05-25Bibliographically approved
Cao, Y., Zheng, D., Dong, S., Zhang, F., Lin, J., Wang, C. & Lin, C. (2019). A Composite Corrosion Inhibitor of MgAl Layered Double Hydroxides Co-Intercalated with Hydroxide and Organic Anions for Carbon Steel in Simulated Carbonated Concrete Pore Solutions. Journal of the Electrochemical Society, 166(11), C3106-C3113
Open this publication in new window or tab >>A Composite Corrosion Inhibitor of MgAl Layered Double Hydroxides Co-Intercalated with Hydroxide and Organic Anions for Carbon Steel in Simulated Carbonated Concrete Pore Solutions
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2019 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 166, no 11, p. C3106-C3113Article in journal (Refereed) Published
Abstract [en]

Corrosion of steel in concrete has resulted in shorter service life of concrete constructions and it may also cause serious safety accident. Chloride attack and carbonation of the concrete are two of the most crucial trigger factors for the initiation of corrosion. In order to protect the reinforced steel in concrete from corrosion, in this work, a composite inhibitor of layered double hydroxides (LDHs) intercalated with organic phthalates (PTL) and hydroxide ions (MgAl-LDHs-OH-PTL) were synthesized by calcination-reconstruction methods in ambient atmosphere. The structure, composition and morphology of the prepared MgAl-LDHs-OH-PTL were obtained by X-ray diffraction, Fourier transform infrared spectroscopy and Scanning Electron Microscopy, respectively. The electrochemical measurements indicated that the inhibition efficiency of MgAl-LDHs-OH-PTL for carbon steel in the simulated carbonated concrete pore (SCCP) solutions reached more than 90% when its concentration was 20 g/L. It was found that the MgAl-LDHs-OH-PTL possessed multifunctional protection roles for the carbon steel in concrete, which mainly included decrease of aggressive Cl-ions, increase of the pH of SCCP solutions and release of PTL anions to the solution gradually. The work indicated the promising potential of LDHs compounds as effective multifunctional inhibitors in the field of corrosion protection of reinforced concrete.

Place, publisher, year, edition, pages
ELECTROCHEMICAL SOC INC, 2019
National Category
Other Chemistry Topics
Identifiers
urn:nbn:se:kth:diva-251199 (URN)10.1149/2.0141911jes (DOI)000464595800001 ()2-s2.0-85073435850 (Scopus ID)
Note

QC 20190724

Available from: 2019-07-24 Created: 2019-07-24 Last updated: 2020-03-09Bibliographically approved
Yang, H., Huang, L., Zhang, F., Karde, V., Yang, Z. & Heng, J. Y. Y. (2019). Gravity on Crystallization of Lysozyme: Slower or Faster?. Crystal Growth & Design, 19(12), 7402-7410
Open this publication in new window or tab >>Gravity on Crystallization of Lysozyme: Slower or Faster?
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2019 (English)In: Crystal Growth & Design, ISSN 1528-7483, E-ISSN 1528-7505, Vol. 19, no 12, p. 7402-7410Article in journal (Refereed) Published
Abstract [en]

With the increase in applications of protein-based medicines approved and developed, downstream manufacturing of biopharmaceuticals has challenges of finding cost-effective and reliable routes. Biocrystallization and centrifugation have both been used to isolate and purify macromolecules, such as therapeutic protein and other functional proteins. However, the centrifugation cannot perfectly separate biomolecules, and the biocrystallization mainly focuses on structure determination on a scale of microliters or below. In this work, protein crystallization of lysozyme, with a concentration of 35-45 mg/mL, and sodium chloride, with a concentration of 45-55 mg/mL in the solution, on a scale of milliliters was performed under centrifugation. Different gravity levels of 1-20000g and centrifugation durations have been investigated during the nucleation and crystal growth process. There were no obvious influences of low gravity (<100g) and short duration (<5 min) of centrifugation on the crystallization process: i.e., on the changes in concentrations. With continuous centrifugation (>30 min), high gravity (>1000g) hindered the nucleation, i.e., it reduced the drop in concentration at the nucleation stage; however, it accelerated the crystal growth process, i.e. enhanced a at the crystal growth stage.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-266227 (URN)10.1021/acs.cgd.9b01447 (DOI)000501621100065 ()2-s2.0-85075595892 (Scopus ID)
Note

QC 20200103

Available from: 2020-01-03 Created: 2020-01-03 Last updated: 2020-01-03Bibliographically approved
Shao, C., Zhang, F., Li, X., Zhang, J., Jiang, Y., Cheng, H. & Zhu, K. (2019). Influence of Cr doping on the oxygen evolution potential of SnO2/Ti and Sb-SnO2/Ti electrodes. JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 832, 436-443
Open this publication in new window or tab >>Influence of Cr doping on the oxygen evolution potential of SnO2/Ti and Sb-SnO2/Ti electrodes
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2019 (English)In: JOURNAL OF ELECTROANALYTICAL CHEMISTRY, ISSN 1572-6657, Vol. 832, p. 436-443Article in journal (Refereed) Published
Abstract [en]

Oxygen evolution potential is the determining factor affecting the anode efficiency of the wastewater treatment process. In this study, we focus on increasing oxygen evolution potential of Cr-SnO2/Ti and Cr-Sb-SnO2/Ti electrodes with the pyrolytic method. XRD, SEM and XPS techniques had been applied to characterize the microstructures and chemical compositions of the samples. Electrochemical measurements had been performed to evaluate the oxygen evolution potential as a criterion of the wastewater treatment efficiency. The results show that co-doping of Sb and Cr improved the crystallinity and grain size of SnO2 coating, and Cr existed in the form of Cr(III) valence states. The Cr doping treatment improved the electronic conductivity and the electrocatalytic activity of the electrodes. DFT calculation of the band-structure indicates Cr doped SnO2 had a superior electrical conductivity, where Cr atom acts as an acceptor providing vacancies for electron transportation. The DOS diagrams reveal the Cr doped SnO2 showing a p-type conductivity which would subsequently influence the built-in potential on metal-semiconductor interface. We proposed the mechanism of the increase of oxygen evolution potential is the doping of Cr expands the built-in potential.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE SA, 2019
Keywords
Oxygen evolution potential, Cr doping, Wastewater treatment, DFT
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-244136 (URN)10.1016/j.jelechem.2018.11.058 (DOI)000456759300054 ()2-s2.0-85057783585 (Scopus ID)
Note

QC 20190218

Available from: 2019-02-18 Created: 2019-02-18 Last updated: 2019-02-18Bibliographically approved
Cao, Y., Zheng, D., Luo, J., Zhang, F., Dong, S., Pan, J. & Lin, C. (2019). Insight into the Fabrication of ZnAl Layered Double Hydroxides Intercalated with Organic Anions and Their Corrosion Protection of Steel Reinforced Concrete. Journal of the Electrochemical Society, 166(16), C617-C623
Open this publication in new window or tab >>Insight into the Fabrication of ZnAl Layered Double Hydroxides Intercalated with Organic Anions and Their Corrosion Protection of Steel Reinforced Concrete
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2019 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 166, no 16, p. C617-C623Article in journal (Refereed) Published
Abstract [en]

This work provides insight into the fabrication of ZnAl layered double hydroxides (LDHs) intercalated with organic phthalates (PTL) and their corrosion protection of steel reinforced concrete. The structure, composition and morphology of the LDH products prepared by various methods were systematically characterized to find out the relationship of preparation-structure-properties. The ZnAl-LDH-PTL prepared by co-precipitation method presented the best performance of corrosion protection due to its good crystallinity. The corrosion protection mechanism of LDH for steel in concrete system was also discussed.

Place, publisher, year, edition, pages
Electrochemical Society, 2019
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-265502 (URN)10.1149/2.0361916jes (DOI)000500516800001 ()2-s2.0-85075978966 (Scopus ID)
Note

QC 20191213. QC 20200109

Available from: 2019-12-13 Created: 2019-12-13 Last updated: 2020-01-09Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-5180-9895

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