Abstract
Self assembled monolayers (SAM) formed by fluoro-phosphonic and undecenyl-phosphonic acids on carbon steel surfaces as anticorrosive nanocoatings were investigated. The anticorrosive efficacy of these SAM layers was followed by atomic force microscopy, when the change in the surface morphology caused by layer deposition and corrosion processes was monitored. The corrosion process was determined by electrochemical potentiodynamic polarization and cyclic voltammetry. Results showed that both chemicals produced good protection against corrosion as anodic inhibitors specially with increasing the time of layer formation which results in a more compact molecular film. According to the AFM images, the fluoro-phosphonic acid self-assembled molecular layer can control the general as well as the pitting corrosion, but the SAM layers of the undecenyl-phosphonic acid cannot inhibit the pitting corrosion. The AFM measurements confirmed the electrochemical results.
Highlights
Self-assembled monolayer (SAM) is one of the new potential alternatives for a metal pre-treatment by ultrathin organic films [1].This is a flexible method to form thin and well-defined organic coatings for example by hydroxamic and phosphonic acids on a variety of solid surfaces [2, 3]
3.2 AFM results The polished carbon steel samples with and without coatings were visualized by AFM after immersion into neutral electrolyte (NaClO4) solution in order to visualize the morphological change caused by the aerated aqueous solution as well as into NaCl solution to study the efficiency of the nanolayers on the pitting corrosion
Potentiodynamic polarization measurements made it clear that both nanofilms behave as anodic inhibitor, as the Ecorr is shifted into the anodic potential range and, at the same time, the metal dissolution is hindered significantly which resulted in high corrosion inhibition efficiency
Summary
Self-assembled monolayer (SAM) is one of the new potential alternatives for a metal pre-treatment by ultrathin organic films [1].This is a flexible method to form thin and well-defined organic coatings for example by hydroxamic and phosphonic acids on a variety of solid surfaces [2, 3]. Abstract Self assembled monolayers (SAM) formed by fluorophosphonic and undecenyl-phosphonic acids on carbon steel surfaces as anticorrosive nanocoatings were investigated. Results showed that both chemicals produced good protection against corrosion as anodic inhibitors specially with increasing the time of layer formation which results in a more compact molecular film.
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