Abstract
The effect of the adsorption of 5-mercaptopentyl-3-amino-1,2,4-triazole (MPATA) on the corrosive behavior of brass (Cu80/Zn20) in neutral (pH 7.4) borate buffer solutions with and without 0.01 M NaCl was studied. Electrochemical methods show significant decrease of the anodic and cathodic currents on the polarization curves in the presence of MPATA. X-ray photoelectron spectroscopy (XPS) reveals MPATA adsorption on the brass surface from an inhibitor solution. After 17 h of exposure, a mixed complex [CuxZnyMPATAz] with a thickness of about 3–3.5 nm is formed on the surface. This nanolayer has sufficient protective ability to withstand corrosion tests in a salt fog chamber: after 5 days of testing, the samples remain glossy and less than 1% of the surface has been damaged. After corrosion tests in a salt fog chamber, the surface of unprotected samples is enriched with zinc, while at the surface of inhibitor-treated samples, the copper and zinc are present in practically equal contents.
Highlights
Brass, an alloy of copper and zinc, is an important and interesting material, known for its technological properties and finds wide application, ranging from mechanical engineering to medical application and arts
We have found that 5 min washed with double distilled water in an ultrasonic bath
That is why the surface of brass sample exposed upmost surface layer is presented by Cu–OH [55]
Summary
An alloy of copper and zinc, is an important and interesting material, known for its technological properties and finds wide application, ranging from mechanical engineering to medical application and arts. Many studies are devoted to the analysis of new, more effective inhibitors, whose structures contain various substituents improving inhibiting characteristics. On one hand, they can influence the electronic properties of the active sites of molecules involved in donor-acceptor
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