Naslov
Electrochemical functionalization of a 316L stainless steel surface with a 11-mercaptoundecanoic acid monolayer : Stability studies

Autori
Dadafarin, Hesam ; Konkov, E. ; Omanović, Saša

Izvornik
International journal of Electrochemical Science (1452-3981) 8 (2013), 1; 369-389

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
corrosion inhibition; electrochemical surface functionalization; mercaptoundecanoic acid; monolayer stability; self-assembled monolayer; stainless steel

Sažetak
A self-assembled monolayer (SAM) of 11-mercaptoundecanoic acid (MUA) was formed on a 316L stainless steel (SS) surface, using a cyclic potentiodynamic electrochemical technique (cyclic voltammetry). The presence of the formed monolayer was confirmed by polarized modulation infrared reflection adsorption spectroscopy (PM-IRRAS), contact angle (CA), ellipsometry, and X-ray photoelectron spectroscopy (XPS). The stability of the monolayer was investigated by PM-IRRAS, CA and electrochemical impedance spectroscopy (EIS). XPS showed that the MUA is attached to the 316L SS surface mostly through the sulfur atom, but some MUA molecules are also attached to the surface through both the thiol and carboxylate groups. PM-IRRAS demonstrated that the formed SAM is semi-ordered. The SAM was stable in a corrosive environment (phosphate buffer saline, PBS) for seven days, and also withstood the exposure to elevated temperatures and fluid shear stress. EIS results revealed that the SAM also inhibited general corrosion of 316L SS over a period of seven days of constant immersion in PBS, with an average inhibition efficiency of 94%.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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