Improved hydrophobicity for better corrosion control by special self-assembled molecular coatings

• É.K. Pfeifer¹ and J. Telegdi^2,3

¹ University of Pannonia, Institute of Material and Mechanical Engineering 8200 Veszprém, Egyetem Str 10, Veszprém, Hungary
² Department of Functional and Structural Materials, Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences; 1117 Budapest, Magyar tudósok körútja 2, Hungary
³ Óbuda University, Faculty of Light Industry and Environmental Engineering, Budapest, Hungary

Abstract: The aim of this work was to prepare protective films of alkenyl phosphonic acid (APC) in self-assembled molecular layer (SAM) on different metals in order to improve the corrosion resistance of steals surfaces. The influence of the alloy composition as well as the condition of layer formation and its post-treatment was in the focus of the work in order to prepare compact nanofilm that can control the metal corrosion in chloride ion environment. The influence of layer formation parameters on the layer compactness and on the corrosion resistance were characterized by water contact angle values, by atomic force microscopy (AFM) as well as by roughness parameters. In order to increase the compactness of the APC–SAM layer the nanofilms were heat treated at different temperatures and time intervals. The change in the layer characteristics caused by deposition temperature and by the post-treatments was demonstrated by wet contact angles and by AFM. The increased anticorrosion effect caused by the proper preparation conditions, by post-treatments as well as by the metal composition was characterized by the change in the roughness parameters as well as in the morphology visualized by AFM. The results showed that the increased anticorrosion activity of the compact nanolayers is due to blocking the active area on the metal surface by forming barrier between the aggressive environment and the metal surface.

Keywords: alkenyl phosphonic acid, self-assembled layer, steel, wetting, roughness, atomic force microscopy, anticorrosion effect

Int. J. Corros. Scale Inhib., 2022, 11, no. 3, 1041-1062
doi: 10.17675/2305-6894-2022-11-3-9

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