Yearly Archives: 2013

Kinetics of Corrosion Inhibition of Aluminum in Alkaline Solutions by Water-Soluble Poly (Vinyl Alcohol) as Synthetic Polymer


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Figure 1.

The influence of water-soluble poly (vinyl alcohol) (PVA) as a synthetic polymer containing secondary alcoholic groups on the rate of dissolution of aluminum (Al) metal in alkaline medium has been investigated using both gasometric and weight-loss techniques. The results showed that addition of poly (vinyl alcohol) to the tested solutions leads to a remarkable decrease in the corrosion rates of Al in alkali. The magnitude of inhibition efficiency was determined and compared to that obtained with other macromolecules containing secondary alcoholic groups. The inhibition action of PVA on Al metal surface was found to obey Freundlich adsorption isotherm. Factors affecting the corrosion process such as the concentration and nature of the inhibitor, concentration of the corrosive medium and the temperature were examined. A tentative inhibition mechanism consistent with the kinetic results obtained is suggested and discussed.

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Umicore celebrated its 125th anniversary


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A regional operation turned into a global medium-sized company with more than 60 own sales offices and professional representations.
Umicore Galvanotechnik is a recognized and leading producer of decorative and functional coating processes mainly for the electronic-, communications-, automobile- and jewelry industry. Precious metal and non-precious metal electrolytes for the improvement of technical features or optical aspects are developed and produced. The product line is round off by precious metal preparations and dimensionally stable anode and cathode systems. The worldwide sales and service network ensures nationwide support for customers and business partners.
This year, the Gmuend based electroplating experts celebrated its 125th anniversary, a perfect occasion for a glimpse into the past and the future. Continue reading… →

Vladimir N. Kudryavtsev passed away on Thursday, October 31, 2013


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Vladimir Kudryavtsev

Doctor of Science, Professor, Head of the Department of Electrochemical Engineering of the Mendeleyev University of Chemical Technology

Vladimir Kudryavtsev was born in Moscow on May 24, 1935 in an academic family. His father , Nikolay T Kudryavtsev, Dr. Sci. Professor was a prominent scientist in the field of electrochemical engineering, especially in electroplating , and at that time he was a Head of the Department of Electrochemical Engineering at the Mendeleyev Institute of Chemical Technology (now – Mendeleyev University). His experience, close cooperation with soviet plating industries turned to be powerful attraction for his son and for his choice of his future. Continue reading… →

Advisory Board Member Prof. Dr. Siegfried Steinhäuser was awarded the Friendship Prize of Jiangsu Province (China)


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Prof. Dr. Siegfried Steinhäuser and Mao Weiming

After having reached the 65th year of life in 2005, Prof. Dr. Siegfried Steinhäuser officially was officially retiring – but as adherent of TU Chemnitz he continues to work on his subject area (materials science) and engages i.a. in China. In September 2013 Prof. Steinhäuser was now honored with the Friendship Prize awarded by the Governor of Jiangsu Province, Mao Weiming, in the capital Nanjing. Jiangsu Province with its 80 million inhabitants counts among the most prospering provinces in China. Within a solemn act also other outstanding personalities from industry and academia, i.a. from Canada, India and Sweden, were honored. Continue reading… →

Pulse plating of nickel-based alloys


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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.

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