Surface protection of copper in aerated 3.5% sodium chloride solutions by 3-amino-5-mercapto-1,2,4-triazole as a copper corrosion inhibitor

Abstract

Surface protection of copper in aerated 3.5% NaCl solutions by 3-amino-5-mercapto-1,2,4-triazole (AMTA) has been reported. The study has been carried out using weight loss, pH, potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), and chronoamperometric (CA) measurements along with scanning electron microscopy (SEM) and energy dispersive X-ray (EDS) investigations. Weight-loss data indicated that the dissolution rate and the pH of the solution decreased to a minimum after 24 days of copper immersion due to the inhibitive action of AMTA. PDP, CA, and EIS measurements showed that AMTA decreased the corrosion rates and increased the polarization resistance and inhibition efficiency. This effect was increased with increasing AMTA concentration as well as the immersion time of the copper electrode to 50 h before measurements. SEM micrograph and EDS analysis proved that the inhibition of copper corrosion takes place due to adsorption of AMTA onto the surface. These results together confirmed that AMTA is a good mixed-type inhibitor and the inhibition of copper corrosion is achieved by strong adsorption of AMTA molecules.

Synthesis and characterization of new quinoxaline d erivatives of 8- hydroxyquinoline as corrosion inhibitors for mild s teel in 1.0 M HCl medium

“…The SEM principle consists of an electron beam scanning the surface of the sample to be analyzed that, in response, re-emits certain particles. These particles are analyzed by different detectors, which make it possible to reconstruct a three-dimensional image of the surface [62][63][64][65][66][67][68][69]. In order to evaluate the morphology of the surface of the steel to prove whether the inhibition is due to the formation of a film of organic molecules on its surface, we have used scanning electron microscopy (SEM).…”

Effects of exposure time on the anodic dissolution of Monel-400 in aerated stagnant sodium chloride solutions

“…We have successfully employed the method to explain the corrosion and corrosion inhibition of several metals and alloys in chloride media [16,[22][23][24][28][29][30][31][32][33][34][35][36][37]. The Nyquist plots (a), Bode (b), and phase angle (c), respectively, for Monel-400 after its immersion for 1 h (1), 24 h (2), and 72 h (3) in aerated stagnant 3.5% NaCl solutions are shown in Fig.…”

Enhanced Anti-corrosion Ability and Biocompatibility of PLGA Coatings on MgZnYNd Alloy by BTSE-APTES Pre-treatment for Cardiovascular Stent

“…As the anti-corrosion ability is correlated to the enlargement of capacitive loops, we may conclude a super ability of MgZnYNd-B-A-P in corrosion resistance. The above analysis of EIS plot is reported to be the most widely adopted interpretation [50,53] , even the explaination for EIS curve of Mg alloys has never reached an agreement, with only a few other editions reported [54] .…”