It poses great problems to our society, making it the subject of investigation for many research groups, which dedicate great efforts to find means to prevent or control this process. The Universidad Autónoma de Madrid has tested a new protection technique that consists of the electrodeposition of a conductive polymer (polypyrrole) over the surface of a material like copper that is easily oxidised.
Copper is widely used for many applications and being a metal that oxidises relatively easily, its conservation represents a great economical benefit. Conventional methods to avoid or minimise corrosion of the material are in many cases short lived, very expensive and involve the use of toxic chemicals.
A recent article by Pilar Herrasti published in the Electrochimica Acta journal describes how copper has been successfully covered with a conductive polymer that creates a barrier with the corrosive environment while leaving the conductive property of the material untouched. Conductive polymers are remarkable materials - plastics with a slightly altered composition that make them capable of conducting electricity. Synthesising these polymers is not complicated and the process can be varied to increase or decrease their conductivity.
When an oxidising potential is applied to a pyrrole solution, it oxidises the compound over the electrode, and a thin film of the material is laid over the metal. In the case of copper, the methodology involves generating a layer of copper oxide over which the polymer is deposited. This layer is conductive like the metal and since it is deposited in an oxidised state it can then be reduced, maintaining the copper in the passivity zone (non corrosion zone), while simultaneously acting as a physical barrier between the copper and the environment. For its effect to be adequate on the material there are two fundamental conditions, the oxide-reductive potential must be high and there should be minimal porosity.
To achieve this goal, a detailed study of electrodeposition has been carried out, using different techniques, and adjusting the different parameters such as environmental composition and potentials or currents applied. The polymer deposited copper was then tested by submerging it in a solution of NaCl, simulating sea water, which is one of the most corrosive environments there are, since it contains large numbers of chloride ions.
These ions are responsible for an extremely localised form of corrosion that leads to the creation of small holes in the metal, known as pitting. The study of the behaviour of these materials had led to the conclusion that by tuning the different parameters, a thin film can be created that withstands the attack of this harsh environment for at least a month.
Researchers shoot for success with simulations of laser pulse-material interactions
29.03.2017 | DOE/Oak Ridge National Laboratory
Nanomaterial makes laser light more applicable
28.03.2017 | Christian-Albrechts-Universität zu Kiel
The Institute of Semiconductor Technology and the Institute of Physical and Theoretical Chemistry, both members of the Laboratory for Emerging Nanometrology (LENA), at Technische Universität Braunschweig are partners in a new European research project entitled ChipScope, which aims to develop a completely new and extremely small optical microscope capable of observing the interior of living cells in real time. A consortium of 7 partners from 5 countries will tackle this issue with very ambitious objectives during a four-year research program.
To demonstrate the usefulness of this new scientific tool, at the end of the project the developed chip-sized microscope will be used to observe in real-time...
Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.
The results will be published on March 22 in the journal „Astronomy & Astrophysics“.
Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...
Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.
Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...
In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...
20.03.2017 | Event News
14.03.2017 | Event News
07.03.2017 | Event News
29.03.2017 | Materials Sciences
29.03.2017 | Physics and Astronomy
29.03.2017 | Earth Sciences