Cut-edge corrosion behavior assessment of newly developed environmental-friendly coating systems using the Scanning Vibrating Electrode Technique (SVET). (November 2021)

• Record Type: Journal Article
• Authors: Sheikholeslami, Sina; Williams, Geraint; McMurray, H. Neil; Gommans, Louis; Morrison, Scott; Ngo, Sonny; Williams, David E.; Gao, Wei
• Is Part Of: Corrosion science. Volume 192(2021)
• Publication Date: 2021-11
• Subjects: Galvanized steel -- Cut-edge -- Corrosion -- SVET -- Benzotriazole -- Calcium silica -- Waterborne -- Environmental-friendly -- Coil coating; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2021.109813
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: Accelerated cut-edge corrosion performance of commercialized full waterborne coating systems containing enviro-friendly corrosion inhibitors was studied on 55 wt% Al, 44 wt% Zn and 1 wt% Si galvanized steel in 5 wt% NaCl solution at ambient temperature via the Scanning Vibrating Electrode Technique (SVET). At the same volume content (7–11 wt%), benzotriazole pigments had a better overall cut-edge corrosion performance than calcium ion exchanged silica pigments. It was due to benzotriazole's superior cathodic protection of the cut-edge in comparison with calcium silicate. Furthermore, although both enviro-friendly inhibitors did not exhibit the same performance level as the conventional Cr(VI)-containing system, they exhibited promising results in inhibiting cut-edge corrosion in a fully commercialized waterborne coating system. Highlights: Evaluating Cut-edge corrosion of newly developed environmentally friendly coating systems for roofing industry. Overall performance assessment and comparison of Chrome (VI), Calcium/Silica, or Benzotriazole-contained inhibitors. Studying cut-edge corrosion of galvanized coils coated with fully commercialized organic primer and topcoat via SVET. Corrosion performance analysis based on inhibition mechanisms.