Corrosion protective properties of coatings doped with inhibitors

• Published in: Anti-corrosion methods and materials 2014-10, Vol.61 (6), p.416-422
• Main Authors: Parsa, Mansoureh, Mohammad Ali Hosseini, Seyed, Hassani, Zahra, Jamalizadeh, Effat
• Format: Article
• Language: English
• Subjects: Alloys; Aluminum alloys; Aluminum base alloys; Analytical methods; Atomic beam spectroscopy; Atomic force microscopy; Chloride; Coating effects; Coatings; Copper; Corrosion; Corrosion inhibitors; Corrosion potential; Corrosion prevention; Corrosion resistance; Corrosion resistant alloys; Corrosion tests; Crosslinking; Electrochemical impedance spectroscopy; Electrochemistry; Electrodes; Engineering; Gels; Inhibition; Inhibitors; Mechanical engineering; Microscopy; Morphology; Nanoparticles; Polyethyleneimine; Polymers; Properties; Protection; Protective coatings; Self healing materials; Sol gel process; Sol-gel processes; Spectrum analysis; Titanium; Titanium dioxide; VOCs; Volatile organic compounds; Water resistance
• ISSN: 0003-5599; 1758-4221
• DOI: 10.1108/ACMM-07-2013-1281

Purpose – The purpose of this paper was to study the corrosion resistance of water-based sol-gel coatings containing titania nanoparticles doped with organic inhibitors for corrosion protection of AA2024 alloy. Design/methodology/approach – The coatings were obtained using tetraethylorthosilicate, 3-glycidoxypropyltrimethoxysilane, titanium (IV) tetrapropoxide and poly(ethylene imine) polymer as cross-linking agents. As corrosions inhibitors, 2-mercaptobenzoxazole and salicylaldoxime were incorporated into the sol-gel for the improvement of the corrosion resistance. The corrosion protection performance of coatings was studied using the potentiodynamic scan and the electrochemical impedance spectroscopy (EIS) methods. Atomic force microscopy was used to investigate surface morphology of the coatings. Findings – The results indicated that doping the sol-gel coatings with inhibitors leads to improvement of the corrosion protection. The comparison of doped coatings confirmed that corrosion protection performance of the sol-gel coatings doped with 2-mercaptobenzoxazole was better than for the sol-gel coatings doped with salicylaldoxime. Also the EIS results verified self-healing effects for the sol-gel coatings doped with 2-mercaptobenzoxazole. Originality/value – This paper indicates 2-mercaptobenzoxazole and salicylaldoxime can be added as corrosion inhibitors to sol-gel coatings to improve their corrosion protective properties for AA2024 alloy.