999 publications from this institution
Демьянов С.Е., Канюков Е.Ю., Петров А.В., Белоногов Е.К., Стрельцов Е.А., Иванов Д.К., Иванова Ю.А. Поверхность. Рентгеновские, синхротронные и нейтронные исследования, 2014
By positioning the layer containing Ce(dbp)3 close to the coating–metal interface, the effective use of the inhibitor is promoted, as the leaching out towards the metal surface is facilitated. The chemical nature of Ce(dbp)3 did not undergo any significant change due to the plasma discharge. The coatings with Ce(dbp)3 were compared with equivalent coatings without incorporated corrosion inhibitor and it was shown that Ce(dbp)3 improved the corrosion performance when the coating was mechanically damaged. Optical evaluation of the coatings showed a significant decrease in the corrosion, especially in the area under the coating. However, the low corrosion resistance values obtained by electrochemical impedance spectroscopy indicate that corrosion was not inhibited all over the scribed area.
No abstract is provided for this article.
SUMMARYHomogeneous roughening of aluminium surfaces is carried out by A.C. electrograining in dilute acids, to produce uniformly pitted and convoluted surfaces. The morphology of A.C. electrograined aluminium surfaces is affected by electrolyte and graining conditions. By comparison of morphologies developed during treatment in hydrochloric and nitric acid, it is proved that the morphological building elements and their ordering are fundamentally different, leading to different final morphologies. The basic elements building up the morphology of surfaces treated in nitric and hydrochloric solutions are respectively a small flat walled hemispherical pit and a fine cubic pit. The effective diameter of the building elements increases, with increasing current density and decreasing graining frequencies. The susceptibility for pitting is higher in chloride solutions: pits are initiated at much lower potentials and at much higher rates; in addition the initiation of pits occurs much faster.
No abstract is provided for this article.
No abstract is provided for this article.
No abstract is provided for this article.
One of the molecules which has been noted to form self‐assembled monolayers on aluminium oxide is the phosphonic acid molecule. A variety of chain lengths and solvents have been discussed in state of the art literature. No global consensus about the adsorption mechanism and its limitations has been found yet. In this study, we present the continuation of previous analysis of the adsorption of n‐octylphosphonic acids on chemically and morphologically optimised aluminium oxides. An ex situ analysis approach, using atomic force microscopy, X‐ray photoelectron spectroscopy and Visible Ellipsometry (VISE) is presented. It can be seen that from ethanol, the molecules adsorb on the surface. This occurs in a very unstable way, creating defects at the surface. Through modeling of ellipsometry data, it is found that the oxide film itself is attacked by the acids, resulting in non homogeneous organic overlayers. It seems that, from an ex situ point of view, ethanol is not suitable for the creation of n‐octylphoshonic acid monolayers. The reaction of the phosphonic acids with the aluminium hydroxyls creates local aqueous environments, which are, in combination with dissolved acids, hazardous for the oxide surface. Copyright © 2012 John Wiley & Sons, Ltd.
