Hybridisation as an efficient joining, electrochemical corrosion study as a need

Author/s: A. Viandier, D. Stefaniak, C. Hühne and M. Sinapius
Posted on Monday, January 16, 2017

Fig. 1: A380-800 material mix [3]
Fig. 2: Drilled CFRP-steel-laminate manufactured at the Composite Design Department at DLR, Braunschweig
Fig. 3: Fuselage of Aloha Airlines Flight 243, 1988 [20]
Fig. 4: Possible corrosion forms [23]

The composite technology allows the development of structures with a high degree of integration, where the number of elements and auxiliary means for their structural joining are minimised. This can only be achieved by the use of appropriate manufacturing and design processes. Some advantages of such an efficient integration would be the low installation and inspection efforts, shorter cycle times in the production, higher robustness and lower manufacturing costs. Despite this high potential, joining these highly integrated parts is indispensable because of restrictions concerning the components’ complexity, repair requirements as well as material specific limitations [1].

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Electrochemical Deposition and Characterization of Conjugated Copolymers of Thiophene and Aniline

Author/s: Prof. R. K. P. Singh, Shashikala Devi, Jyoti Malviya, Hemlata Singh and D.Phill Laxmi Kant Sharma
Posted on Friday, December 30, 2016

Scheme 1: Schematic reactions for route synthesis of copolymer of Thiophene with Aniline derivative
Fig. 6: XRD patterns of co-polymers of poly-co-thio- Ani (6a) and poly-thio-co-o-toluidine (6b) in powder form
Tab. 1: Current-Potential data of Electro-copolymerization of thiophene with aniline and its derivative via radical and radical cation coupling mechanism
Fig. 7: SEM images of the poly-co-thio- Ani (7a) and poly-thio-co-o-toluidine (7b) with different magnification and cross-section

A new series of copolymers, obtained by reacting aniline as electron donor with thiophene as electron acceptor in a donor–acceptor structure (poly-thio-co-ani), were synthesized via electrochemical polymerization using acetonitrile as a solvent and lithium perchlorate as supporting electrolyte. The copolymer have better solubility in DMSO and KOH than the corresponding homopolymers. Copolymerization of aniline and thiophene was studied by UV-visible and FT-IR spectroscopy. In order to analyze their structure and characteristics X-ray diffraction analysis was applied and the samples were photographed under scanning electron microscope (SEM) for microstructure analysis and morphological property. Electrochemical properties were observed by cyclic voltammetry.

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Adsorption and inhibitive properties of aqueous extracts of rosmarinus as a green corrosion extract for copper in HNO₃

Author/s: Prof. Dr. A. S. Fouda, Azza A. Attia (Assistant Professor), H. M. Kila and A. M. Salem
Posted on Wednesday, November 30, 2016

Fig. 9a-c: SEM micrographs of copper surface (a) before of immersion in 1 M HNO3, (b) after 48 h of immersion in 1 M HNO3, (c) after 48 h of immersion in 1 M HNO3+ 11x10-6 M of Rosmarinus extract at 25°C
Fig. 8: Equivalent circuit model used to fit experimental EIS
Fig. 7b: The Bode plots for the corrosion of copper in 1M HNO3 in the absence and presence of different concentrations of Rosmarinus extract at 25OC
Fig. 1: Weight loss-time curves for the corrosion of copper in 1 M HNO3 in the absence and presence of different concentrations of rosmarinus extract at 25ᵒC

The efficiency of plant extract as corrosion extract for copper in 1M HNO₃ medium was carried out using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. The results showed variation in inhibition performance of the extract with varying concentration, immersion time and temperature. Langmuir isotherm was tested to describe the adsorption behavior of the extract on the copper surface. Potentiodynamic polarization study clearly revealed that this extract acts as a mixed type inhibitor i.e. the addition of the extract enhances both cathodic and anodic reactions. The results of the electrochemical impedance study showed a decrease in double layer capacitance and an increase in the charge transfer resistance. The results showed that rosmarinus extract could play significant role as corrosion inhibitor for copper in 1M HMO₃.

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Journal Galvanotechnik

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Trade journal for electroplating and surface engineering.
The oldest-established and leading trade journal for surface treatment of metals in the world. Published monthly and including the topics: photovoltaic, thin-film/plasma technology, microsystem technology and environmental technology.

Tribological behavior of Zn-Ni layers electrodeposited on different substrates by various methods

Author/s: Mihail Chira, Horatiu Vermesan, Ernest Grunwald and Gheorghe Borodi
Posted on Wednesday, October 12, 2016

Fig. 2: SEM images: a) Zn-Ni sample, b) SiO2 + Zn-Ni + bp + f sample, and c) SiO2 + BN + Zn-Ni + f sample
Fig. 3: AFM images: a) Zn-Ni sample, b) SiO2 + Zn-Ni + bp + f sample, and c) SiO2 + BN + Zn-Ni + f sample
Fig. 1: Experimental stand for tribocorrosion test
Fig. 4: Diffraction spectra of sample coatings

The tribological behavior of an electrodeposited Zn-Ni alloy layer has been investigated to understand the effect of substrate and electroplating methods. The substrates used were: steel, steel/silicon dioxide and steel/silicon dioxide/boron nitride. The tribological behavior was investigated using a ball-on-plate tribometer equipped with an electrochemical cell with 1 % NaCl solution. Open circuit potential measurements, chrono-amperometry (CA) (constant potential electrolysis technique – CPE) measurements and electro-chemical impedance spectroscopy (EIS) measurements were made, before and after a wear test. The coefficient of friction was also measured. The structure and morphology of the electrodeposited layers and the nature of the corrosion products were determined using SEM, XRD and AFM measurements. The Zn-Ni coating electrodeposited using pulse current electrodeposition on steel/silicon dioxide/boron nitride substrate was found to have a higher tribocorrosion resistance compared to the Zn-Ni layers electrodeposited by using pulse current electrodeposition and electrodeposition in a magnetic field on steel/silicon dioxide or by conventionally electrodeposited on steel substrate.

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JEPT – Journal for Electrochemistry and Plating Technology

Edited by: DGO-Fachausschuss Forschung – Hilden / Germany

Hybridisation as an efficient joining, electrochemical corrosion study as a need

Electrochemical Deposition and Characterization of Conjugated Copolymers of Thiophene and Aniline

Adsorption and inhibitive properties of aqueous extracts of rosmarinus as a green corrosion extract for copper in HNO₃

Journal Galvanotechnik

Link

Trade journal for electroplating and surface engineering.
The oldest-established and leading trade journal for surface treatment of metals in the world. Published monthly and including the topics: photovoltaic, thin-film/plasma technology, microsystem technology and environmental technology.

Tribological behavior of Zn-Ni layers electrodeposited on different substrates by various methods

Trade journal for electroplating and surface engineering. The oldest-established and leading trade journal for surface treatment of metals in the world. Published monthly and including the topics: photovoltaic, thin-film/plasma technology, microsystem technology and environmental technology.

Trade journal for electroplating and surface engineering.
The oldest-established and leading trade journal for surface treatment of metals in the world. Published monthly and including the topics: photovoltaic, thin-film/plasma technology, microsystem technology and environmental technology.