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Publikasjoner (10 av 84) Visa alla publikasjoner
State, S. P., Costovici, S., Mousavi, M., Garcia, Y. G., Zanella, C., Cojocaru, A., . . . Enachescu, M. (2024). Electrodeposited Sn-Cu-Ni alloys as lead-free solders on copper substrate using deep eutectic solvents: The influence of electrodeposition mode on the morphology, composition and corrosion behaviour. Surface & Coatings Technology, 477, Article ID 130324.
Åpne denne publikasjonen i ny fane eller vindu >>Electrodeposited Sn-Cu-Ni alloys as lead-free solders on copper substrate using deep eutectic solvents: The influence of electrodeposition mode on the morphology, composition and corrosion behaviour
Vise andre…
2024 (engelsk)Inngår i: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 477, artikkel-id 130324Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In this work we present the pulsed current (PC) electrodeposition of Sn-Cu-Ni alloy as lead-free solder candidate, from choline chloride – ethylene glycol eutectic mixtures (1:2 molar ratio) onto copper metallic substrates. Electrolytes containing Sn2+, Cu2+ and Ni2+ salts in the selected deep eutectic solvent have been considered. The effect of the applied frequency of PC on the morphology, composition and melting point of the alloy is discussed and compared to the ones obtained using direct current (DC) plating mode. A refinement of the grain size and lower melting temperature of the alloy were noticed when pulsed current was applied. A comparative analysis of the electrochemical corrosion behaviour at macro- and micro- scale has been performed in 0.5 M and 0.1 M NaCl solutions involving potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode (SVET) techniques. Furthermore, an analysis after 96 h of exposure to salt mist test simulating a corrosive attack in harsh environment is presented, too. The obtained results showed enhanced corrosion resistance of the ternary alloys electrodeposited under PC conditions (the best for 1.67 Hz frequency) as compared to those using DC. Additionally, Raman spectroscopy evidenced the presence of tin oxi/hydroxy chloride and tin oxides as surface corrosion products. A corrosion mechanism has been proposed.

sted, utgiver, år, opplag, sider
Elsevier, 2024
Emneord
Corrosion behaviour, Deep eutectic solvents, Electrodeposition, Sn-Cu-Ni ternary alloy, SVET, Copper alloys, Copper corrosion, Corrosion resistance, Corrosion resistant alloys, Corrosive effects, Electrochemical corrosion, Electrochemical impedance spectroscopy, Electrodes, Ethylene, Ethylene glycol, Eutectics, Lead-free solders, Melting point, Molar ratio, Morphology, Nickel alloys, Organic solvents, Sodium chloride, Substrates, Tin alloys, Tin oxides, Choline chloride, Copper substrates, Electrodeposition mode, Morphology behavior, Pulsed currents, Pulsed-current electrodeposition, Scanning vibrating electrodes, Ternary alloys
HSV kategori
Identifikatorer
urn:nbn:se:hj:diva-63273 (URN)10.1016/j.surfcoat.2023.130324 (DOI)001148267500001 ()2-s2.0-85180943601 (Scopus ID);intsam;926129 (Lokal ID);intsam;926129 (Arkivnummer);intsam;926129 (OAI)
Forskningsfinansiär
EU, Horizon 2020
Tilgjengelig fra: 2024-01-10 Laget: 2024-01-10 Sist oppdatert: 2024-02-12bibliografisk kontrollert
Ahmadkhaniha, D., Ascani, D. & Zanella, C. (2023). High entropy alloy deposition from an aqueous bath. In: : . Paper presented at 244th ECS Meeting (ECS 244), Gothenburg, Sweden, 8–12 October 2023.
Åpne denne publikasjonen i ny fane eller vindu >>High entropy alloy deposition from an aqueous bath
2023 (engelsk)Konferansepaper, Oral presentation with published abstract (Fagfellevurdert)
HSV kategori
Identifikatorer
urn:nbn:se:hj:diva-63243 (URN)
Konferanse
244th ECS Meeting (ECS 244), Gothenburg, Sweden, 8–12 October 2023
Tilgjengelig fra: 2024-01-09 Laget: 2024-01-09 Sist oppdatert: 2024-01-09bibliografisk kontrollert
Ahmadkhaniha, D., Sieber, M. & Zanella, C. (2023). Improving the electroplating simulation model for producing uniform coating thickness distribution. In: : . Paper presented at 35th Conference on Surface Modification Technologies (SMT 35), Hamburg, Germany, 18 - 22 September 2023.
Åpne denne publikasjonen i ny fane eller vindu >>Improving the electroplating simulation model for producing uniform coating thickness distribution
2023 (engelsk)Konferansepaper, Oral presentation only (Fagfellevurdert)
HSV kategori
Identifikatorer
urn:nbn:se:hj:diva-63248 (URN)
Konferanse
35th Conference on Surface Modification Technologies (SMT 35), Hamburg, Germany, 18 - 22 September 2023
Tilgjengelig fra: 2024-01-09 Laget: 2024-01-09 Sist oppdatert: 2024-01-09bibliografisk kontrollert
Sainis, S. & Zanella, C. (2022). A localized study on the influence of surface preparation on the reactivity of cast Al-7Si-1Fe and Al-7Si-2Cu-1Fe alloys and their effect on cerium conversion coating deposition. Applied Surface Science, 585, Article ID 152730.
Åpne denne publikasjonen i ny fane eller vindu >>A localized study on the influence of surface preparation on the reactivity of cast Al-7Si-1Fe and Al-7Si-2Cu-1Fe alloys and their effect on cerium conversion coating deposition
2022 (engelsk)Inngår i: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 585, artikkel-id 152730Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The spontaneous triggering of cerium-based conversion coating deposition occurs due to active micro-galvanic couple induced local rise in pH at cathodic sites. Since surface preparations prior to conversion coating treatment modify the surface reactivity or the extent of micro-galvanic coupling between the anodic and cathodic phases, they are of crucial importance. While many past works have studied the effect of various preparations including alkaline etching and/or acid pickling and their parameters on the resulting conversion coating, very few studies focus on the local surface reactivity changes from the surface preparation. Moreover, most of the studies use high Cu containing AA2024, and related work on other alloys are scarce. In this study, two model cast alloys Al-7Si-1Fe and Al-7Si-2Cu-1Fe have been created to obtain a relatively homogeneous microstructure containing two different cathodic activity intermetallics Fe-rich IM β-Al5FeSi and Cu-rich IM θ-Al2Cu. Changes in the surface state of each alloy are monitored with AFM-SKPFM after subjecting them to four specific surface preparations: (1) Mechanical polishing (2) NaOH etching (3) NaOH etching + HNO3 Pickling (4) NaOH etching + H2SO4 pickling and correlations have been made with localized conversion coating deposit observations.

sted, utgiver, år, opplag, sider
Elsevier, 2022
Emneord
AFM-SKPFM, Cerium, Conversion coating, Localized deposition, SEM, Volta potential, Alkalinity, Aluminum coatings, Copper alloys, Etching, Iron alloys, Silicon alloys, Sodium hydroxide, AFM, Cerium conversion coatings, Coatings deposition, Conversion coatings, Localised, Surface preparation, Surface reactivity, Deposition
HSV kategori
Identifikatorer
urn:nbn:se:hj:diva-55961 (URN)10.1016/j.apsusc.2022.152730 (DOI)000776625500004 ()2-s2.0-85124178334 (Scopus ID)HOA;;798115 (Lokal ID)HOA;;798115 (Arkivnummer)HOA;;798115 (OAI)
Forskningsfinansiär
EU, Horizon 2020, 764977
Tilgjengelig fra: 2022-03-02 Laget: 2022-03-02 Sist oppdatert: 2022-10-07bibliografisk kontrollert
Atefi, S., Parsa, M. H., Ahmadkhaniha, D., Zanella, C. & Jafarian, H. R. (2022). A study on microstructure development and mechanical properties of pure copper subjected to severe plastic deformation by the ECAP-Conform process. JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T, 21, 1614-1629
Åpne denne publikasjonen i ny fane eller vindu >>A study on microstructure development and mechanical properties of pure copper subjected to severe plastic deformation by the ECAP-Conform process
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2022 (engelsk)Inngår i: JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T, ISSN 2238-7854, Vol. 21, s. 1614-1629Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Commercially pure copper rod was successfully subjected to severe plastic deformation by applying the continuous equal channel angular pressing (ECAP-Conform) method at room temperature. Microstructural characterizations of copper rod samples at various stages of plastic deformation were carried out by optical microscopy and electron backscatter diffraction methods. X-ray diffractometry and Kernal average misorientation were used for dislocation density estimations. Microstructural evaluations revealed grain size change of 30 mm for the initial annealed copper rod to less than 5 mm and even 100 nm for severely deformed samples. Mechanical behaviors of samples after different deformation stages were characterized using tensile and hardness tests. The ultimate tensile strength of the severely deformed copper rod was increased threefold by ECAP-Conform while elongation halved in comparison to the initial annealed copper. Low-temperature annealing of severely plastic deformed samples led to bi-modal grain size distribution and lowering of strength accompanied by the increase of elongation. Tensile properties of severely deformed and then annealed copper samples showed around a 40% increase in both ultimate tensile strength and elongation in comparison to the initial annealed copper rod.

sted, utgiver, år, opplag, sider
Elsevier, 2022
Emneord
Severe plastic deformation, ECAP-Conform, Copper, Microstructure, Mechanical properties
HSV kategori
Identifikatorer
urn:nbn:se:hj:diva-59141 (URN)10.1016/j.jmrt.2022.09.103 (DOI)000891778500003 ()2-s2.0-85144615222 (Scopus ID)HOA;intsam;848412 (Lokal ID)HOA;intsam;848412 (Arkivnummer)HOA;intsam;848412 (OAI)
Tilgjengelig fra: 2022-12-15 Laget: 2022-12-15 Sist oppdatert: 2023-01-10bibliografisk kontrollert
Ahmadkhaniha, D., Kruemmling, J. & Zanella, C. (2022). Electrodeposition of High Entropy Alloy of Ni-Co-Cu-Mo-W from an Aqueous Bath. Journal of the Electrochemical Society, 169(8), Article ID 082515.
Åpne denne publikasjonen i ny fane eller vindu >>Electrodeposition of High Entropy Alloy of Ni-Co-Cu-Mo-W from an Aqueous Bath
2022 (engelsk)Inngår i: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 169, nr 8, artikkel-id 082515Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

This study aimed to deposit high entropy alloy (HEA) coatings with five different elements, Ni, Co, Cu, Mo, and W, from a single aqueous bath. The influence of pH, current density, and complex agent on the composition of deposited coating was examined. It was shown that Mo and W were codeposited mainly with Ni and Co. pH had the most impact on the codeposition of reluctant elements like Mo and W, while current density had the minimum effect. The deposited coating had a metallic, dense, and nodular morphology with configurational entropy of around 1.6 R.

sted, utgiver, år, opplag, sider
Electrochemical Society, 2022
Emneord
high entropy alloy, electrodeposition, Ni-Co-Cu-Mo-W, aqueous bath
HSV kategori
Identifikatorer
urn:nbn:se:hj:diva-58403 (URN)10.1149/1945-7111/ac87d5 (DOI)000841982600001 ()2-s2.0-85136880979 (Scopus ID);intsam;58403 (Lokal ID);intsam;58403 (Arkivnummer);intsam;58403 (OAI)
Forskningsfinansiär
Swedish Research Council, 2018-05323
Tilgjengelig fra: 2022-09-02 Laget: 2022-09-02 Sist oppdatert: 2023-08-18bibliografisk kontrollert
Santos, J., Zhu, B., Zanella, C. & Jarfors, A. E. .. (2022). Fatigue Crack Initiation on Semi-Solid Al–7Si–Mg Castings. Metals, 12(7), Article ID 1061.
Åpne denne publikasjonen i ny fane eller vindu >>Fatigue Crack Initiation on Semi-Solid Al–7Si–Mg Castings
2022 (engelsk)Inngår i: Metals, ISSN 2075-4701, Vol. 12, nr 7, artikkel-id 1061Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Four-point bending fatigue tests were performed on semi-solid Al–7Si–Mg castings with varying magnesium contents and heat treatment conditions. Additionally, the effect of anodising on the fatigue resistance of semi-solid Al–7Si–Mg castings was evaluated. Fracture surface and microstructure analysis showed that fatigue crack initiation occurred mainly at the periphery of regions of positive macrosegregation at the casting surface, resulting most likely from exudation. The microstructure of these macrosegregation regions was mostly eutectic and was frequently found surrounded by a layer of oxides. This layer of oxides promoted weak bonding between the macrosegregation region and the surrounding material and acted as a crack initiation site. In this study, primary α-Al globule agglomerates at the casting surface and surrounded by a layer of oxides also promoted fatigue crack initiation. Fatigue resistance of semi-solid Al–7Si–Mg castings in the T5 and T6 conditions increased with the increase in the magnesium content of the alloy from 0.3 to 0.45 wt.% due to the higher precipitation hardening response. However, the increase in the magnesium content from 0.45 to 0.6 wt.% resulted in a slight decrease in the fatigue resistance. The oxide layer formed during anodising had no significant effect on the fatigue resistance of the semi-solid Al–7Si– Mg castings in this study due to the dominant effect of the macrosegregation regions on fatigue crack initiation.

sted, utgiver, år, opplag, sider
MDPI, 2022
Emneord
crack initiation, fatigue, heat treatment, macrosegregation, rheocasting
HSV kategori
Identifikatorer
urn:nbn:se:hj:diva-58016 (URN)10.3390/met12071061 (DOI)000833661700001 ()2-s2.0-85132985051 (Scopus ID)GOA;intsam;822790 (Lokal ID)GOA;intsam;822790 (Arkivnummer)GOA;intsam;822790 (OAI)
Forskningsfinansiär
Vinnova, 2014-05096Knowledge Foundation, 20100280
Tilgjengelig fra: 2022-07-22 Laget: 2022-07-22 Sist oppdatert: 2022-08-16bibliografisk kontrollert
Pinate, S., Ghassemali, E. & Zanella, C. (2022). Strengthening mechanisms and wear behavior of electrodeposited Ni–SiC nanocomposite coatings. Journal of Materials Science, 57(35), 16632-16648
Åpne denne publikasjonen i ny fane eller vindu >>Strengthening mechanisms and wear behavior of electrodeposited Ni–SiC nanocomposite coatings
2022 (engelsk)Inngår i: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 57, nr 35, s. 16632-16648Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The present paper describes the study of the synergism between the matrix microstructure and reinforcement phase in electrodeposited nanocomposite coatings. Adding hard nanoparticles into the metallic matrix leads to hardening of the coating. The effects of particle load, size and dispersion on hardening as well as their influence on metal microstructure refinement were studied. The relative contributions of strengthening factors in Ni/nano-SiC composites, namely, Hall–Petch strengthening, Orowan strengthening, enhanced dislocation density and particles incorporation, were evaluated. The production of various coatings under different stirring conditions and powders resulted in dissimilarities in the incorporation of particles. The Hall–Petch relationship for pure nickel was determined using samples produced under different current densities. Additionally, the grain refinement resulting from the particle codeposition and agitation mode were identified as influential factors in grain-size strengthening. Dislocation density strengthening was significant in electrodeposits produced using ultrasonic agitation, while it was negligible in layers produced under other conditions. Particles codeposition affected the magnitude of Orowan strengthening, resulting in cases where strengthening was negligible despite the presence of particles. The sum of contributions and the modified Clyne methods were used to calculate the hardness of the composites based on the contribution of each strengthening factor, and the calculation results were in good agreement with experimental data. The wear behavior of the composites was analyzed by pin-on-disk measurements, and the results correlated with the strengthening mechanisms. Particle size, dispersion and content increased the strengthening effects as well as the hardness and wear resistance of the coatings.

sted, utgiver, år, opplag, sider
Elsevier, 2022
HSV kategori
Identifikatorer
urn:nbn:se:hj:diva-52334 (URN)10.1007/s10853-022-07655-1 (DOI)000852259400003 ()2-s2.0-85137600367 (Scopus ID)HOA;;1548027 (Lokal ID)HOA;;1548027 (Arkivnummer)HOA;;1548027 (OAI)
Forskningsfinansiär
Knowledge Foundation, 20310117
Merknad

Included in doctoral thesis in manuscript form with the title "Strengthening mechanisms by particles codeposition and wear behaviour of electroplated Ni-SiC coatings".

Tilgjengelig fra: 2021-04-28 Laget: 2021-04-28 Sist oppdatert: 2022-09-22bibliografisk kontrollert
Zanella, C. & Fedel, M. (2022). Surface Treatments on Al Alloys and Composites. In: J. Rams & M. Whittaker (Ed.), Encyclopedia of Materials: Metals and Allloys: Volume 1 (pp. 170-178). Elsevier
Åpne denne publikasjonen i ny fane eller vindu >>Surface Treatments on Al Alloys and Composites
2022 (engelsk)Inngår i: Encyclopedia of Materials: Metals and Allloys: Volume 1 / [ed] J. Rams & M. Whittaker, Elsevier, 2022, s. 170-178Kapittel i bok, del av antologi (Fagfellevurdert)
Abstract [en]

This article will give a review of the surface treatments commonly applied to Aluminum alloys substrates. As for any other metallic substrate, a surface finishing will protect aluminum only if the surface layer develops good adhesion to the substrate. Therefore, the article starts with a summary of the common cleaning process steps and continues with the presentation of pretreatment process alternatives. The finishing surface treatments presented in this article are painting, anodizing and metallic coating deposition, as they represent the most common and widely applied solution to protect aluminum substrates from corrosion and wear, increasing, therefore, the substrate durability.

sted, utgiver, år, opplag, sider
Elsevier, 2022
Emneord
Aluminum alloys; Anodizing; Conversion coatings; Durability; Painting; Protection; Surface treatments
HSV kategori
Identifikatorer
urn:nbn:se:hj:diva-55065 (URN)10.1016/B978-0-12-819726-4.00116-2 (DOI)2-s2.0-85118659495 (Scopus ID)978-0-12-819733-2 (ISBN)
Tilgjengelig fra: 2021-11-15 Laget: 2021-11-15 Sist oppdatert: 2021-11-16bibliografisk kontrollert
Sainis, S. & Zanella, C. (2021). A study of the localized ceria coating deposition on Fe-rich intermetallics in an AlSiFe cast alloy. Materials, 14(11), Article ID 3058.
Åpne denne publikasjonen i ny fane eller vindu >>A study of the localized ceria coating deposition on Fe-rich intermetallics in an AlSiFe cast alloy
2021 (engelsk)Inngår i: Materials, ISSN 1996-1944, E-ISSN 1996-1944, Vol. 14, nr 11, artikkel-id 3058Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Corrosion inhibiting conversion coating formation is triggered by the activity of micro-galvanic couples in the microstructure and subsequent local increase in pH at cathodic sites, which in the case of aluminium alloys are usually intermetallics. Ceria coatings are formed spontaneously upon immersion of aluminium alloys in a cerium conversion coating solution, the high pH gradient in the vicinity of intermetallics drives the local precipitation of ceria conversion compounds. Cu-rich intermetallics demonstrate a highly cathodic nature and have shown the local precipitation reaction to occur readily. Fe-rich intermetallics are, however, weaker cathodes and have shown varied extents of localized deposits and are in focus in the current work. Model cast Al-7wt.%Si alloys have been designed with 1 wt.% Fe, solidified at different cooling rates to achieve two different microstructures, with big and small intermetallics, respectively. Upon subjecting the two microstructures to the same conversion coating treatment (immersion in a 0.1 M CeCl3 solution) for a short period of 2 h, preferential heavy deposition on the boundaries of the big intermetallics and light deposition on the small intermetallics was observed. Based on these observations, a mechanism of localized coating initiation at these Fe-rich intermetallic particles (IM) is proposed.

sted, utgiver, år, opplag, sider
MDPI, 2021
Emneord
conversion coating; cerium; localized deposition; Fe; intermetallic; SEM; EDS; AFM; SKPFM; microstructure-induced localized deposition
HSV kategori
Identifikatorer
urn:nbn:se:hj:diva-51563 (URN)10.3390/ma14113058 (DOI)000660272500001 ()2-s2.0-85107757358 (Scopus ID)GOA;;1519165 (Lokal ID)GOA;;1519165 (Arkivnummer)GOA;;1519165 (OAI)
Forskningsfinansiär
EU, Horizon 2020, 764977
Merknad

Included in licentiate thesis in manuscript form with the title: "A study on the localized cerium coating deposition on Fe-rich intermetallics in an Al-Si-Fe cast alloy".

Tilgjengelig fra: 2021-01-18 Laget: 2021-01-18 Sist oppdatert: 2022-10-07bibliografisk kontrollert
Organisasjoner
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0003-2924-137X