Inhibition of galvanic corrosion in Al/Cu coupling model by synergistic combination of 3-Amino-1, 2, 4-triazole-5-thiol and cerium chloride. (1st May 2020)

• Record Type: Journal Article
• Authors: Udoh, Inime Ime; Shi, Hongwei; Soleymanibrojeni, Mohammad; Liu, Fuchun; Han, En-Hou
• Is Part Of: Journal of materials science & technology. Volume 44(2020)
• Page Start: 102
• Page End: 115
• Publication Date: 2020-05-01
• Subjects: Aluminium alloy -- Galvanic corrosion -- Neutral inhibition -- Scanning vibrating electrode technique (SVET) -- X-ray photoelectron spectroscopy (XPS) -- Time of flight secondary ion mass spectrometry (ToF-SIMS); Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2020.01.015
• Languages: English
• ISSNs: 1005-0302

Abstract

Abstract: A synergistic inhibition study was carried out on an aluminium/copper galvanic coupling model in neutral aerated NaCl solution using scanning vibrating electrode technique (SVET). The approach allows the simulation of the local micro-galvanic cells of AA2024-T3 obtained from the potential difference between the intermetallic particles (IMPs) and the aluminium matrix. The inhibition effect of CeCl3 and 3-Amino-1, 2, 4-triazole-5-thiol (ATAT) was demonstrated by the reduction in the galvanic current density over Al and Cu surfaces. An improved inhibition from positive synergistic effect was revealed by the combination of the two inhibitors after 24 h of immersion, with the best inhibition recorded for Ce1.5 ATAT3.5 . Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and time of flight secondary ion mass spectrometry (ToF-SIMS) were used to characterize the Ce- and ATAT-based complex film formed and to illustrate the mechanism of inhibition.