Adsorption and corrosion protection behavior of thiazole derivatives on copper surfaces

The inhibition characteristics of some thiazole derivatives against copper corrosion in acidic sulphate containing media have been investigated. The i nvestigated thiazole derivatives were 5-benzylidene-2,4-dioxotetrahydro-1,3 -thiazole (C10O2H7SN) and 5-(4 ' -isopropylbenzylidene)-2,4-dioxotetrahydro -1,3-thiazole (C13O2H13SN). In situ information on corrosion and inhibition processes at nanoscale range were obtained using scanning tunneling micros copy (STM) in combination with quartz crystal microbalance (QCM) measuremen ts. XPS measurements were also performed to analyze the copper electrode su rface. Based on these findings the role of molecular structure in corrosion inhibition has been discussed. The presence of the isopropyl group in the 5-IPBDT molecule produced far better protection against copper corrosion in acidic sulphate containing media than 5-BDT. (C) 2001 Elsevier Science B.V . All rights reserved.