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Zhu, B., Seifeddine, S., Jarfors, A., Leisner, P. & Zanella, C. (2019). A study of anodising behaviour of al-si components produced by rheocasting. Solid State Phenomena, 285, 39-44
Open this publication in new window or tab >>A study of anodising behaviour of al-si components produced by rheocasting
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2019 (English)In: Solid State Phenomena, ISSN 1012-0394, E-ISSN 1662-9779, Vol. 285, p. 39-44Article in journal (Refereed) Published
Abstract [en]

This paper aims to investigate the anodising behaviour of Al-Si components produced by rheocasting, to understand the effect of the surface liquid segregation (SLS) on the anodising response. The material investigated was EN AC 42000 Al-alloy with an addition of 150 ppm Sr. The component was rheocast and conventionally liquid cast for benchmarking. The RheoMetal™ process was used to prepare slurry and subsequently cast using a vertical pressure die casting machine. Prior to anodising, mechanical grinding was used as pre-treatment method for selected samples as comparison with components in the as-cast state. Anodising was performed on the components using a constant controlled voltage at 25 V, in 1 M H2 SO4, at room temperature. The duration of anodising was varied from 30 mins to 120 mins to examine the relationship between oxide layer thickness and the anodising time. The oxide layer was investigated and characterised. The results demonstrated that the presence of the SLS layer, which was enriched with alloying elements, had a significant influence on the anodising behaviour of the cast component. The oxide layer thickness of the components produced by rheocasting and fully liquid casting was measured and compared. The relations between the oxide layer thickness and anodising time, as well as the casting methods are presented and discussed in this paper..

Keywords
Anodising, Oxide layer, Rheocasting, Alloying elements, Die casting, Liquids, Silicon compounds, Surface segregation, Cast components, Liquid segregation, Mechanical grinding, Oxide layer thickness, Pretreatment methods, Vertical pressure, Aluminum alloys
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-37718 (URN)10.4028/www.scientific.net/SSP.285.39 (DOI)2-s2.0-85059944290 (Scopus ID)9783035713732 (ISBN)
Note

 Funding details: Knowledge Foundation, 201000280, 20170066; Funding text 1: This research was supported by the Knowledge Foundation (CompCast project no. 201000280, CompCast Plus project no. 20170066)

Available from: 2019-02-01 Created: 2019-02-01 Last updated: 2019-02-08Bibliographically approved
Zhu, B., Seifeddine, S., Jarfors, A. E. .., Leisner, P. & Zanella, C. (2018). A study of anodising behaviour of Al-Si componentsproduced by rheocasting. In: : . Paper presented at S2P2018, Shenzhen, China 22-24 October 2018.
Open this publication in new window or tab >>A study of anodising behaviour of Al-Si componentsproduced by rheocasting
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2018 (English)Conference paper, Oral presentation with published abstract (Other academic)
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:ri:diva-36950 (URN)
Conference
S2P2018, Shenzhen, China 22-24 October 2018
Available from: 2018-12-28 Created: 2018-12-28 Last updated: 2019-01-11Bibliographically approved
Leisner, P. & Zanella, C. (2018). Application of Assaf panel for evaluating throwing power of pulse reverse electroplating on complex geometries. Transactions of the Institute of Metal Finishing, 96(5), 258-264
Open this publication in new window or tab >>Application of Assaf panel for evaluating throwing power of pulse reverse electroplating on complex geometries
2018 (English)In: Transactions of the Institute of Metal Finishing, ISSN 0020-2967, E-ISSN 1745-9192, Vol. 96, no 5, p. 258-264Article in journal (Refereed) Published
Abstract [en]

The Assaf panel arrangement was used for evaluating pulse reverse plating processes and optimisation of the throwing power (TP) of complex three-dimensional (3D) geometries. Two different electroplating processes were investigated: an acid copper bath and a cyanide silver bath without additives. It has not been possible to establish a direct correlation factor for TP obtained with the Assaf panel and the 3D objects included in the trials. Nevertheless, the Assaf panel was found to be a useful tool for preliminary process parameter optimisation. The copper bath needs agitation to deposit coatings of good quality, whereas the silver bath obtains the best throwing power without agitation. The latter is probably due to inhibition by adsorbed cyanide.

Keywords
copper, pulse reverse, silver, Throwing power, Cyanides, Complex geometries, Correlation factors, Electroplating process, Process parameters, Pulse reverse plating, Three-dimensional (3D) geometry, Electroplating
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-35202 (URN)10.1080/00202967.2018.1507331 (DOI)2-s2.0-85053235016 (Scopus ID)
Available from: 2018-10-10 Created: 2018-10-10 Last updated: 2019-03-06Bibliographically approved
Leisner, P., Hansen, Å. & Zanella, C. (2018). Applicationof Assaf panel for evaluating the throwing power of pulse reverse plating. In: : . Paper presented at 8th European Pulse Plating Seminar, Vienna 2 March 2018.
Open this publication in new window or tab >>Applicationof Assaf panel for evaluating the throwing power of pulse reverse plating
2018 (English)Conference paper, Oral presentation with published abstract (Other academic)
National Category
Manufacturing, Surface and Joining Technology
Identifiers
urn:nbn:se:ri:diva-36947 (URN)
Conference
8th European Pulse Plating Seminar, Vienna 2 March 2018
Available from: 2018-12-28 Created: 2018-12-28 Last updated: 2019-01-11Bibliographically approved
Leisner, P. (2018). Aspectsto be considered when making innovation out of promising research results insurface technology. In: : . Paper presented at 32th International Conference on Surface Modification Technologies (SMT32), San Sebastian 27-29 June 2018.
Open this publication in new window or tab >>Aspectsto be considered when making innovation out of promising research results insurface technology
2018 (English)Conference paper, Oral presentation with published abstract (Other academic)
National Category
Manufacturing, Surface and Joining Technology
Identifiers
urn:nbn:se:ri:diva-36948 (URN)
Conference
32th International Conference on Surface Modification Technologies (SMT32), San Sebastian 27-29 June 2018
Available from: 2018-12-28 Created: 2018-12-28 Last updated: 2019-03-06Bibliographically approved
Ahmadkhaniha, D., Eriksson, F., Leisner, P. & Zanella, C. (2018). Effect of SiC particle size and heat-treatment on microhardness and corrosion resistance of NiP electrodeposited coatings. Journal of Alloys and Compounds, 769, 1080-1087
Open this publication in new window or tab >>Effect of SiC particle size and heat-treatment on microhardness and corrosion resistance of NiP electrodeposited coatings
2018 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 769, p. 1080-1087Article in journal (Refereed) Published
Abstract [en]

Electrodeposition of NiP composite coatings with nano and sub-micron sized SiC has been carried out to investigate the possibility of replacing hard chromium coatings. The composition and structure of the coatings were evaluated by energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) analysis, respectively. Microhardness was measured by Vickers indentation and polarization measurements were carried out to study the corrosion behavior of the coatings. The results showed that submicron particles can be codeposited with a higher content as compared to nano sized ones. However, even if a smaller amount of the nano-sized SiC particles are incorporated in the coating, the contribution to an increasing microhardness was comparable with the submicron sized particles, which can be related to the higher density of codeposited particles. SiC particles did not change the anodic polarization behavior of NiP coatings in a 3.5% NaCl solution. Finally, the effect of heat-treatment on the coatings properties at 400 °C for 1 h was studied to investigate the contribution of particles and heat-treatment on hardness and corrosion properties. It was found that the heat-treatment doubled the microhardness and changed the anodic polarization behavior of the coatings from passive to active with respect to the as-plated conditions.

Keywords
Electrodeposition, Heat-treatment, Microhardness, NiP, Polarization, SiC
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-35030 (URN)10.1016/j.jallcom.2018.08.013 (DOI)2-s2.0-85051683091 (Scopus ID)
Note

Financial support of European Union's for PROCETS project (Horizon 2020 research and innovation program under grant agreement No 686135 ).

Available from: 2018-08-27 Created: 2018-08-27 Last updated: 2018-08-27Bibliographically approved
Cornander, A. & Leisner, P. (2018). Emissionfree non-road mobile machinery. In: : . Paper presented at City of Copenhagen Climate Conference, Copenhagen 12 November 2018.
Open this publication in new window or tab >>Emissionfree non-road mobile machinery
2018 (English)Conference paper, Oral presentation only (Other academic)
National Category
Vehicle Engineering Energy Engineering
Identifiers
urn:nbn:se:ri:diva-36949 (URN)
Conference
City of Copenhagen Climate Conference, Copenhagen 12 November 2018
Funder
Interreg Öresund-Kattegat-Skagerrak
Available from: 2018-12-28 Created: 2018-12-28 Last updated: 2019-01-11Bibliographically approved
Belov, I., Alavizadeh, Z., Lindgren, M., Rydén, J. & Leisner, P. (2018). Experimental and CFD evaluation of active anti-condensation methods for non-hermetic cabinets. In: 2018 19th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems (EuroSimE): . Paper presented at 2018 19th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems (EuroSimE) (pp. 1-6).
Open this publication in new window or tab >>Experimental and CFD evaluation of active anti-condensation methods for non-hermetic cabinets
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2018 (English)In: 2018 19th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems (EuroSimE), 2018, p. 1-6Conference paper, Published paper (Refereed)
Abstract [en]

Experimental evaluation of several active anti-condensation methods for application in non-hermetic electronics enclosures was performed in harsh climatic conditions, including RH = 70% and T = 43 °C. The studied methods included blowing the air along the exposed surface, combination of blowing and air heating as well as local heating of the exposed surface in natural convection conditions. The purpose was to prevent/remove the dew on/from the exposed surface of a micro-condensation sensor. The difference between the methods was quantified in terms of time for dew removal. The power consumption aspects were discussed. A CFD based optimization methodology was developed to determine the heating profiles for the local anti-condensation PCB heater in a non-hermetic cabinet exposed to the quickly changing climatic conditions. The potential for 60% energy savings was revealed by simulation.

Keywords
computational fluid dynamics, condensation, electronics packaging, heating, natural convection, microcondensation sensor, CFD based optimization methodology, nonhermetic cabinet, active anti-condensation methods, natural convection conditions, air heating, temperature 43.0 degC, Heating systems, Surface treatment, Humidity, Plastics, Electron tubes, Temperature measurement, Bars
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-34345 (URN)10.1109/EuroSimE.2018.8369863 (DOI)2-s2.0-85048877385 (Scopus ID)
Conference
2018 19th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems (EuroSimE)
Available from: 2018-08-06 Created: 2018-08-06 Last updated: 2019-01-08Bibliographically approved
Belov, V., Leisner, P., Mannikoff, A. & Belov, I. (2018). Mathematical Model of Multi-Phase Power Converter for Parallel Computation. International Journal of Emerging Electric Power Systems, Article ID 20170114.
Open this publication in new window or tab >>Mathematical Model of Multi-Phase Power Converter for Parallel Computation
2018 (English)In: International Journal of Emerging Electric Power Systems, ISSN 2194-5756, E-ISSN 1553-779X, article id 20170114Article in journal (Refereed) Published
Abstract [en]

A mathematical model of a multi-phase power conversion system composed of modified bridge-elements (B-system) capable for parallel computation has been developed. Experimental validation on the example of a power system including a synchronous generator and an AC-DC rectifier has been performed. A mathematical algorithm for B-system assembly and steps to obtain mathematical model of the B-system have been developed. Integration of mathematical models of conversion system into the complete model of a multi-phase power system has been explained and evaluation of computational efficiency of parallel computation techniques for the developed model of an AC-DC-AC converter has been performed. The presented modelling method can be employed in the design phase of smart grids, for power quality and conducted emission analysis.

Keywords
mathematical model, parallel computation, power converter, power quality, power system, rectifier, AC-AC power converters, Computational efficiency, Electric inverters, Electric power transmission networks, Mathematical models, Power converters, Quality control, Rectifying circuits, Smart power grids, AC-DC-AC converters, Conducted emissions, Experimental validations, Mathematical algorithms, Power conversion systems, Electric rectifiers
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-33442 (URN)10.1515/ijeeps-2017-0114 (DOI)2-s2.0-85042112535 (Scopus ID)
Available from: 2018-03-09 Created: 2018-03-09 Last updated: 2019-02-06Bibliographically approved
Zanella, C. & Leisner, P. (2018). mCBEEs Nytt europeisktutbildningsnätverk loser korrosionsproblem på mikro- och nanonivå. Ytforum
Open this publication in new window or tab >>mCBEEs Nytt europeisktutbildningsnätverk loser korrosionsproblem på mikro- och nanonivå
2018 (Swedish)In: YtforumArticle in journal (Other (popular science, discussion, etc.)) Published
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:ri:diva-35104 (URN)
Available from: 2018-09-01 Created: 2018-09-01 Last updated: 2018-09-05Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-7095-1907

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