About Mag. Dr. Wolfgang Hansal

CEO and Scientific Director, Happy Plating GmbH, Viktor Kaplan Straße 2, A-2700 Wiener Neustadt, Austria

Wolfgang Hansal studied physical chemistry at the University of Vienna, focusing on materials and materials science and electrochemistry. For his dissertation in the field of applied electrochemistry he won the Junior Research Award of the German Society for electroplating and surface treatment 2000.
He worked in two BRITE EURAM projects related to surface processing and characterization, and worked from 2000 to 2004 as a project and work group leader at the Center for Applied electrochemistry in Wiener Neustadt. Mr. Hansal is a "Certified electroplater and Surface Finisher" (CEF-3), a member of the Austrian Chemical Society (Working Group Electrochemistry) and of the "International Society of Electrochemistry ISE ". Together with his wife Selma Hansal he held an international workshop on electro-technology and pulse deposits successfully.
Since 2004 he works at Happy Plating as managing director and chief scientist. Mr. Hansal is the initiator and organizer of the biannual international scientific symposium for pulse plating and author of several scientific publications on pulse separation. At the beginning of 2012 his book "Pulse Plating" was published by Eugen G. Leuze Verlag KG (Germany).

Please find bellow all articles from this author which were published in our journal. Lists with articles the author published in our or other journals, can be found at the following databases:

ResearcherID
Not listed
TEMA Database
German articles
English articles
ORCID
Mag. Dr. Wolfgang Hansal

Pulse plating of nickel-based alloys

Fig. 1: Cathodic polarisation curves for (a) Ni-Co, (b) Sn-Ni and (c) Ni-W electrolyte systems recorded at a scan rate of 10mVs-1 on a rotating disk electrode at different electrode rotating velocity: 0, 100, 600 and 1000rpm

In the present work, nickel-based alloy coatings (Ni-Co, Sn-Ni and Ni-W) with different microstructures were produced under direct and pulse current conditions. These alloys are of interest as potential replacement for chromium based coatings, especially hard chromium. A replacement for hard chromium coating faces the challenge of providing sufficient hardness values.  For some sliding wear applications, hardness might not be required at the same level as hard chromium, and coating toughness might be more critical.
The effects of the pulse parameters (pulse waveform, pulse frequency and average current density) on the deposit structure and properties of these three systems have been investigated. Pulses have been defined based on the results of electrochemical measurements and numerical process simulation. The surface morphology, microstructure and microhardness of the deposit have been correlated to the pulse parameters applied.
The experimental results showed that applying pulse plating substantially altered the properties of the coatings. The resulting layers exhibited a nano-crystalline microstructure, improved layer compactness and hardness of the nickel-based alloy deposits. Continue reading…