Influence of the nanolayer’ post-treatment on the anticorrosion activity

• J. Telegdi^1,2 and T. Abohalkuma^3,4

¹ Óbuda University, Doberdó u. 6., 1034 Budapest, Hungary
² Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, 1117 Budapest, Hungary
³ PhD School of Materials Sciences and Technologies, Óbuda University, Bécsi út 96/B 1016, Budapest, Hungary
⁴ Libyan Petroleum Institute, Girgarisg Road Km7, Tripoli, Libya

Abstract: The study of self-assembled molecular layer (SAM) of undecenyl phosphonic acid amphiphilic molecule was in the focus of experiments. This molecule has a double bond at the end of the hydrophobic carbon chain, which does not allow the formation of a very compact SAM layer. The nanolayers were developed on carbon steel surface polished before layer deposition. To increase the compactness of the nanolayer, post-treatments were applied. In one case UV light, in the other case gamma-ray irradiation were used to polymerize the double bonds and form a film with net-like structure on the metal surface. The influence of the SAM layer treatments on the layer structure was followed by monitoring the change in water wettability and by atomic force microscopic (AFM) visualization of the morphological alteration. At the UV treatment the time dependence, at the irradiation the change in the dose were the altered factors. The post-treatments of the self-assembled undecenyl phosphonic acid molecular layer resulted in denser nanolayer structures and the consequence was a significantly improved anticorrosion activity. The change in the roughness parameters (maximum height of the profile, roughness average and the root means square roughness) arisen from the AFM measurements proved the influence of post treatments on the layer structure, which could be correlated with the increase in the anticorrosion ability as it is known that with increasing surface roughness the possibility of pitting corrosion increases. The increased anticorrosion activity is due to the formation of a more effective, compact barrier layer between the nanolayer-covered metal surface and the corrosive environment.

Keywords: undecenyl phosphonic acid, self assembled molecular layer, contact angle, atomic force microscopy, roughness, corrosion inhibition

Int. J. Corros. Scale Inhib., 2018, 7, no. 3, 352-365 PDF (733 K)
doi: 10.17675/2305-6894-2018-7-3-6

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