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Publications (10 of 141) Show all publications
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
Liu, M., Jin, Y., Leygraf, C. & Pan, J. (2019). A DFT-Study of Cl Ingress into α-Al2O3(0001) and Al(111) and Its Possible Influence on Localized Corrosion of Al. Journal of the Electrochemical Society, 166(11), C3124-C3130
Open this publication in new window or tab >>A DFT-Study of Cl Ingress into α-Al2O3(0001) and Al(111) and Its Possible Influence on Localized Corrosion of Al
2019 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 166, no 11, p. C3124-C3130Article in journal (Refereed) Published
Abstract [en]

Ingress of chloride into alpha-Al2O3(0001) and Al(111) was calculated by first-principles theory calculations by considering Cl insertion into Al or O vacancies within alpha-Al2O3(0001) or into vacancy or interstitial sites within Al(111). For alpha-Al2O3, the formation of an O vacancy is energetically more favorable than of an Al vacancy. The insertion of Cl into an O vacancy is also more favorable than into an Al vacancy. A high energy-barrier has been derived for Cl transport within the neighboring O vacancies. In addition, the work function decreases with Cl ingress into the interior of the oxide. For Al(111), Cl insertion into either an Al vacancy or an interstitial site is less favorable compared to the insertion into alpha-Al2O3. The work function only changes slightly with Cl insertion into an Al vacancy. Moreover, the pre-inserted Cl reduces the energy-barrier for further Cl ingress into alpha-Al2O3, whereas Cl tends to stay in the sub-surface layer of Al(111), suggesting Cl accumulation at the Al2O3/Al.

Place, publisher, year, edition, pages
Electrochemical Society, 2019
National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-251275 (URN)10.1149/2.0161911jes (DOI)000465526200002 ()2-s2.0-85073451731 (Scopus ID)
Note

QC 20191121

Available from: 2019-05-15 Created: 2019-05-15 Last updated: 2019-11-21Bibliographically approved
Långberg, M., Örnek, C., Zhang, F., Cheng, J., Liu, M., Granaes, E., . . . Pan, J. (2019). Characterization of Native Oxide and Passive Film on Austenite/Ferrite Phases of Duplex Stainless Steel Using Synchrotron HAXPEEM. Journal of the Electrochemical Society, 166(11), C3336-C3340
Open this publication in new window or tab >>Characterization of Native Oxide and Passive Film on Austenite/Ferrite Phases of Duplex Stainless Steel Using Synchrotron HAXPEEM
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2019 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 166, no 11, p. C3336-C3340Article in journal (Refereed) Published
Abstract [en]

A new measurement protocol was used for microscopic chemical analysis of surface oxide films with lateral resolution of 1 mu m. The native air-formed oxide and an anodic passive film on austenite and ferrite phases of a 25Cr-7Ni super duplex stainless steel were investigated using synchrotron hard X-ray photoemission electron microscopy (HAXPEEM). Pre-deposited Pt-markers, in combination with electron backscattering diffraction mapping (EBSD), allowed analysis of the native oxide on individual grains of the two phases and the passive film formed on the same area after electrochemical polarization of the sample. The results showed a certain difference in the composition of the surface films between the two phases. For the grains with (001) crystallographic face // sample surface, the native oxide film on the ferrite contained more Cr oxide than the austenite. Anodic polarization up to 1000 mV/(Ag/AgCl) in 1M NaCl solution at room temperature resulted in a growth of the Cr- and Fe-oxides, diminish of Cr-hydroxide, and an increased proportion of Fe3+ species. by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited.

Place, publisher, year, edition, pages
Electrochemical Society, 2019
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-254081 (URN)10.1149/2.0421911jes (DOI)000470207900001 ()2-s2.0-85073465146 (Scopus ID)
Note

QC 20190625

Available from: 2019-06-25 Created: 2019-06-25 Last updated: 2020-03-09Bibliographically approved
Liu, M., Jin, Y., Pan, J. & Leygraf, C. (2019). Co-adsorption of H2O, OH, and Cl on aluminum and intermetallic surfaces and its effects on the work function studied by DFT calculations. Molecules, 24(23)
Open this publication in new window or tab >>Co-adsorption of H2O, OH, and Cl on aluminum and intermetallic surfaces and its effects on the work function studied by DFT calculations
2019 (English)In: Molecules, ISSN 1420-3049, E-ISSN 1420-3049, Vol. 24, no 23Article in journal (Refereed) Published
Abstract [en]

The energetics of adsorption of H2O layers and H2O layers partially replaced with OH or Cl on an Al(111) surface and on selected surfaces of intermetallic phases, Mg2Si and Al2Cu, was studied by first-principle calculations using the density function theory (DFT). The results show that H2O molecules tended to bind to all investigated surfaces with an adsorption energy in a relatively narrow range, between -0.8 eV and -0.5 eV, at increased water coverage. This can be explained by the dominant role of networks of hydrogen bonds at higher H2O coverage. On the basis of the work function, the calculated Volta potential data suggest that both intermetallic phases became less noble than Al(111); also, the Volta potential difference was larger than 1 V when the coverage of the Cl-containing ad-layer reached one monolayer. The energetics of H2O dissociation and substitution by Cl as well as the corresponding work function of each surface were also calculated. The increase in the work function of the Al(111) surface was attributed to the oxidation effect during H2O adsorption, whereas the decrease of the work function for the Mg2Si(111)-Si surface upon H2O adsorption was explained by atomic and electronic rearrangements in the presence of H2O and Cl.

Place, publisher, year, edition, pages
MDPI, 2019
Keywords
aqueous ad-layer; work function; micro-galvanic effect; DFT; aluminum; intermetallics
National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-264004 (URN)10.3390/molecules24234284 (DOI)000507294400083 ()2-s2.0-85075717164 (Scopus ID)
Note

QC 20191122

Available from: 2019-11-20 Created: 2019-11-20 Last updated: 2020-02-17Bibliographically approved
He, Y., Boluk, Y., Pan, J., Ahniyaz, A., Deltin, T. & Claesson, P. M. (2019). Comparative study of CNC and CNF as additives in waterborne acrylate-based anti-corrosion coatings. Journal of Dispersion Science and Technology
Open this publication in new window or tab >>Comparative study of CNC and CNF as additives in waterborne acrylate-based anti-corrosion coatings
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2019 (English)In: Journal of Dispersion Science and Technology, ISSN 0193-2691, E-ISSN 1532-2351Article in journal (Refereed) Published
Abstract [en]

Nanocomposite coatings are of great interest as barrier coatings since synergy effects between matrix and additive properties can be achieved. This, however, requires favorable additive-matrix interactions to provide a strong interphase (interface region). In this work we elucidate the properties of two environmentally benign nanocomposite coatings based on a waterborne acrylate formulation with additives from renewable sources, i.e. either cellulose nanocrystals, CNC; or, alternatively, cellulose nanofibrils, CNF. We focus on the corrosion protective properties of these coatings and discuss the reason why the nanocomposite with CNC displays favorable corrosion protection properties whereas that with CNF does not. To this end we utilized scanning electron microscopy, water contact angle measurement, Fourier transform infrared spectroscopy and electrochemical impedance spectroscopy techniques to investigate the microstructure, surface wetting, interactions between cellulosic materials and matrix as well as corrosion protective properties of both composite coatings.

Place, publisher, year, edition, pages
Taylor & Francis, 2019
Keywords
Composite coating, corrosion protection, cellulose nanocrystals, cellulose nanofibrils, electrochemical impedance spectroscopy
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-257650 (URN)10.1080/01932691.2019.1647229 (DOI)000479890700001 ()
Note

QC 20190904

Available from: 2019-09-04 Created: 2019-09-04 Last updated: 2019-10-18Bibliographically approved
Kharitonov, D. S., Sommertune, J., Örnek, C., Ryl, J., Kurilo, I. I., Claesson, P. M. & Pan, J. (2019). Corrosion inhibition of aluminium alloy AA6063-T5 by vanadates: Local surface chemical events elucidated by confocal Raman micro-spectroscopy. CORROSION SCIENCE, 148, 237-250
Open this publication in new window or tab >>Corrosion inhibition of aluminium alloy AA6063-T5 by vanadates: Local surface chemical events elucidated by confocal Raman micro-spectroscopy
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2019 (English)In: CORROSION SCIENCE, Vol. 148, p. 237-250Article in journal (Refereed) Published
Abstract [en]

Chemical interactions between aqueous vanadium species and aluminium alloy AA6063-T5 were investigated in vanadate-containing NaCl solutions. Confocal Raman and X-ray photoelectron spectroscopy experiments were utilised to gain insight into the mechanism of corrosion inhibition by vanadates. A greenish-grey coloured surface layer, consisting of V+4 and V+5 polymerized species, was seen to form on the alloy surface, especially on top of cathodic micrometre-sized IMPs, whereby suppressing oxygen reduction kinetics. The results suggest a two-step mechanism of corrosion inhibition in which V+5 species are first reduced to V+4 or V+3 species above cathodic IMPs, and then oxidized to mixed-valence V+5/V+4 polymerized compounds.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD, 2019
Keywords
Aluminium, Alloy, Raman spectroscopy, SEM, XPS, Vanadate inhibitor
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-244484 (URN)10.1016/j.corsci.2018.12.011 (DOI)000457950400023 ()2-s2.0-85059158841 (Scopus ID)
Note

QC 20190321

Available from: 2019-03-21 Created: 2019-03-21 Last updated: 2019-04-04Bibliographically approved
He, Y., Boluk, Y., Pan, J., Ahniyaz, A., Deltin, T. & Claesson, P. M. (2019). Corrosion protective properties of cellulose nanocrystals reinforced waterborne acrylate-based composite coating. Corrosion Science, 155, 186-194
Open this publication in new window or tab >>Corrosion protective properties of cellulose nanocrystals reinforced waterborne acrylate-based composite coating
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2019 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 155, p. 186-194Article in journal (Refereed) Published
Abstract [en]

The present investigation highlights corrosion protection of carbon steel by a waterborne acrylate-based matrix coating, with and without reinforcement by cellulose nanocrystals, by using electrochemical impedance spectroscopy in 0.1 M NaCl solution over a period of 35 days. Interactions between cellulose nanocrystals and the matrix coating were demonstrated by Fourier transform infrared spectroscopy. The results show that both coatings have high barrier performance but different protective characteristics during long-term exposure. The differences can be attributed to the reinforcement effect of cellulose nanocrystals caused by hydrogen bonding interactions between cellulose nanocrystals and the matrix coating.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Waterborne organic coatings, Cellulose nanocrystals, Electrochemical impedance spectroscopy, IR spectroscopy, Interfaces, Corrosion protection performance
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-262694 (URN)10.1016/j.corsci.2019.04.038 (DOI)000471086500018 ()2-s2.0-85065617813 (Scopus ID)
Note

QC 20191018

Available from: 2019-10-17 Created: 2019-10-17 Last updated: 2019-10-18Bibliographically approved
Anantha, K. H., Örnek, C., Ejnermark, S., Thuvander, A., Medvedeva, A., Sjostrom, J. & Pan, J. (2019). Experimental and modelling study of the effect of tempering on the susceptibility to environment-assisted cracking of AISI 420 martensitic stainless steel. Corrosion Science, 148, 83-93
Open this publication in new window or tab >>Experimental and modelling study of the effect of tempering on the susceptibility to environment-assisted cracking of AISI 420 martensitic stainless steel
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2019 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 148, p. 83-93Article in journal (Refereed) Published
Abstract [en]

The resistance to environment-assisted cracking (EAC) of AISI 420 martensitic stainless steel (MSS) was investigated in 0.3 M NaCl solution (room temperature) at constant loads for 30 days. The steel tempered at 250 degrees C was superior to the 500 degrees C-temper, which showed corrosion pits favouring cracking. The fracture surface showed faceted grains, cleavage, striations, and inter- and transgranular cracks, suggesting a mixed stress corrosion cracking (SCC) and hydrogen embrittlement (HE) mechanism as the cause for EAC. Finite element modelling (FEM) indicated strain/stress localization at the mouth of deep pits and at the wall of shallow pits, displaying the favoured locations for pit-to-crack transition.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD, 2019
Keywords
Martensitic stainless steel, Residual stress, Tempering, Environment-assisted cracking, Pit-to-crack transition
National Category
Corrosion Engineering
Identifiers
urn:nbn:se:kth:diva-244485 (URN)10.1016/j.corsci.2018.12.010 (DOI)000457950400009 ()2-s2.0-85058373436 (Scopus ID)
Note

QC 20190321

Available from: 2019-03-21 Created: 2019-03-21 Last updated: 2019-04-04Bibliographically approved
Örnek, C., Långberg, M., Evertsson, J., Harlow, G., Linpe, W., Rullik, L., . . . Pan, J. (2019). Influence of Surface Strain on Passive Film Formation of Duplex Stainless Steel and Its Degradation in Corrosive Environment. Journal of the Electrochemical Society, 166(11), C3071-C3080
Open this publication in new window or tab >>Influence of Surface Strain on Passive Film Formation of Duplex Stainless Steel and Its Degradation in Corrosive Environment
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2019 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 166, no 11, p. C3071-C3080Article in journal (Refereed) Published
Abstract [en]

The effect of surface strain on the passive film evolution of SAF 2507 super duplex stainless steel exposed to ambient air and 0.1 M NaCl solution with varying anodic polarization at room temperature has been investigated using in-situ grazing incidence X-ray diffraction (GIXRD) in combination with electrochemical measurements. Surface strain affected the crystallinity of the passive film as such that the surface oxides/hydroxides were predominantly amorphous, with some minor crystalline CrOOH and FeOOH present in the film. Crystalline CrOOH was seen to diminish in volume upon immersion in the NaCl solution, well-possibly becoming amorphous during anodic polarization, whereas crystalline FeOOH was seen to increase in volume during polarization to the passive potential regime. Strain relaxation, associated with metal dissolution, occurred in both austenitic and ferritic grains during immersion in the electrolyte. Anodic polarization to the transpassive regime led to maximum strain relaxation, occurring more on the austenite than the ferrite. The selective transpassive dissolution nature of the ferrite was significantly reduced due to large strains in the austenite. Passive film breakdown was reflected by enhanced dissolution of Fe, Cr, Mo and Ni occurring simultaneously around 1300 mV vs. Ag/AgCl. 

Place, publisher, year, edition, pages
ELECTROCHEMICAL SOC INC, 2019
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-249787 (URN)10.1149/2.0101911jes (DOI)000463697200001 ()2-s2.0-85073425633 (Scopus ID)
Note

QC 20190424

Available from: 2019-04-24 Created: 2019-04-24 Last updated: 2020-03-09Bibliographically 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
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ORCID iD: ORCID iD iconorcid.org/0000-0002-4431-0671

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