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Campestrini, P. (author), van Westing, E.P.M. (author), Hovestad, A. (author), de Wit, J.H.W. (author), TNO Industrie (author)
The parameters of the chromate bath, like temperature, pH, and fluoride content, strongly affect the morphology and chemical composition of the chromate conversion coating and as a consequence have a large influence on its corrosion performance. In this paper, electrochemical impedance spectroscopy (EIS) was used in combination with other...
article 2002
document
van Erkel, J. (author), Klaassen, R. (author), Hovestad, A. (author), Collins, J. (author), Dalrymple, I. (author), Hendou, M. (author), TNO Milieu, Energie en Procesinnovatie (author)
conference paper 2003
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van Erkel, J. (author), Klaassen, R. (author), Hovestad, J. (author), Bisselink, R.J.M. (author), Tacken, R.A. (author), TNO Milieu, Energie en Procesinnovatie TNO Industie (author)
report 2004
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Lodhi, Z.F. (author), Mol, J.M.C. (author), Hovestad, A. (author), Terryn, H. (author), de Wit, J.H.W. (author), TNO Industrie en Techniek (author)
The electrodeposition operating conditions for Zn-Co and Zn-Co-Fe alloys from chloride baths were studied. The electrodeposition was performed on a high strength steel substrate, under galvanostatic conditions, for a range of current densities at varying Co2+ and Fe2+ bath concentrations and at different temperatures. A transition current...
article 2007
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Zhang, X. (author), van den Bos, C. (author), Hovestad, A. (author), Terryn, H. (author), de Wit, J.H.W. (author), TNO Industrie en Techniek (author)
The corrosion behavior of Cr(VI) and Cr(III) treated zinc has been studied using scanning Kelvin probe (SKP), potentiodynamic polarization and elctrochemical impedance spectroscopy (EIS). The Volta potentials measured on the Cr(VI) or the CR(III)-A treated zinc area by SKP in a humid chamber are more negative than on the untreated zinc area,...
bookPart 2007
document
Hovestad, A. (author), Tacken, R.A. (author), 't Mannetje, H.H. (author), TNO Industrie en Techniek (author)
Nanocrystalline white-bronze, CuSn, electroplating was investigated as alternative to Ni plating as undercoat for noble metals in jewellery applications. A strongly acidic plating bath was developed with an organic additive to suppress hydrogen evolution and obtain bright coatings. Polarization curves indicate a strong inhibition by the organic...
conference paper 2008
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Lodhi, Z.F. (author), Mol, L.M.C. (author), Hovestad, A. (author), Terryn, H. (author), de Wit, J.H.W. (author), TNO Industrie en Techniek (author)
Cadmium (Cd) has been extensively used as an excellent corrosion protective coating for steel applications in aerospace, automotive, electrical and fasteners industries. However, Cd is banned due to its toxic nature and strict environmental regulations. In this study, the coating morphology and corrosion resistance of alternative,...
article 2008
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Hovestad, A. (author), Lekka, M. (author), Willemsen, R.M.R. (author), Tacken, R.A. (author), Bonora, P.L. (author), TNO Industrie en Techniek (author)
For jewellery applications electroplated white bronze (CuSn) was investigated as undercoating for noble metal finishes as alternative to nickel. A strongly acidic plating bath was developed with an organic additive to suppress hydrogen evolution and obtain bright coatings. An electrochemical study of the bath shows that the additive strongly...
article 2008
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van Neer, M.K.P. (author), Spee, C.I.M.A. (author), Hovestad, A. (author), Schrauwen, C.P.G. (author), TNO Industrie en Techniek (author)
article 2008
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Hovestad, A. (author), Tacken, R.A. (author), Rendering, H. (author), TNO Industrie en Techniek (author)
article 2009
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Lodhi, Z.F. (author), Mol, J.M.C. (author), Hovestad, A. (author), 't Hoen-Velterop, L. (author), Terryn, H. (author), de Wit, J.H.W. (author), TNO Industrie en Techniek (author)
The corrosion properties of electrodeposited zinc-cobalt-iron (Zn-Co-Fe) alloys (up to 40 wt.% Co and 1 wt.% Fe) on steel were studied by using various electrochemical techniques and compared with zinc (Zn) and cadmium (Cd) coatings in 3.5% NaCl solution. It was found that with an increase in Co content in the coating the open circuit potential ...
article 2009
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Mol, J.M.C. (author), Lodhi, Z.F. (author), Hovestad, A. (author), 't Hoen-Velterop, L. (author), Terryn, H. (author), de Wit, J.H.W. (author)
Cadmium (Cd) has been extensively used as an excellent corrosion protective coating for steel components in aerospace, automotive, electrical and fasteners industries. However, Cd is banned due to its toxic nature and strict environmental regulations. In this study, the electrodeposition mechanism and kinetics, coating morphology and corrosion...
bookPart 2010
document
Hovestad, A. (author), Rendering, H. (author), Peter, M. (author), Meinders, E.R. (author), TNO Industrie en Techniek (author)
In many flexible electronic devices transparent conductive oxide (TCO) window layers are used for current collection. The trade-off between the electrical resistance and optical transmission of TCOs results in power losses. Increasing the electrical conductivity by combining metallic grids with TCOs enables reduction of these power losses....
conference paper 2010
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Hovestad, A. (author), TNO Industrie en Techniek (author), IenT (author)
public lecture 2010
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Hovestad, A. (author)
De totale energiebehoefte van de huidige wereldbevolking is 12-15 terawatt ofwel honderdduizend miljard kilowattuur per jaar. Er zijn maar vijf energiebronnen – olie, gas, kolen, nucleaire brandstof en de zon – die aan deze energiebehoefte kunnen voldoen. Van deze energiebronnen heeft zonne-energie in theorie de grootste potentie. De energie van...
article 2010
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van Deelen, J. (author), Rendering, H. (author), 't Mannetje, H.H. (author), Huis in 't Veld, A.J. (author), Theelen, M.J. (author), Vroon, Z.A.E.P. (author), Poodt, P.W.G. (author), Hovestad, A. (author)
Transparent conductive oxides (TCOs) are widely used in optoelectronic applications and are a vital part in thin film solar cells. However, these materials have some drawback, such as brittleness and a maximum transmittance for a certain sheet resistance. Alternative materials, such as metal foils, nanowires and organic conductors are discussed...
conference paper 2010
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Bolt, P.J. (author), Winands, G.J.J. (author), Theelen, M.J. (author), Hovestad, A. (author), TNO Industrie en Techniek (author)
Integration of multiple functions in single components is pursued in order to manufacture at less cost smaller and smarter polymer micro devices. A method to achieve this is surface activation, i.e. fully or patterned changing of the surface properties. Examples are moulded interconnect devices with conductive surface tracks and lab-on-chip...
conference paper 2010
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Hovestad, A. (author), Rendering, H. (author), Goux, A. (author), Kregting, R. (author), van Neer, M. (author)
article 2010
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van Deelen, J. (author), Rendering, H. (author), 't Mannetje, H.H. (author), Hovestad, A. (author)
Various transparent conducting materials are compared based on their transparency versus sheet resistance characteristics. At present, transparent conducting oxides (TCOs) are still superior in performance compared to various recent alternatives and can only be surpassed by the combination of TCOs with a metal grid. Results on modeling and...
conference paper 2011
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Mol, J.M.C. (author), Lodhi, Z.F. (author), Hovestad, A. (author), 't Hoen-Velterop, L. (author), Terryn, H. (author), de Wit, J.H.W. (author)
Cadmium (Cd) has been extensively used as an excellent corrosion protective coating for steel components in aerospace, automotive, electrical and fasteners industries. However, Cd is banned due to its toxic nature and strict environmental regulations. In this study, the electrodeposition mechanism and kinetics, coating morphology and corrosion...
bookPart 2011
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