Effect of Plasma Surface Pretreatment on Ce3+-Doped GPTMS-ZrO2 Self-Healing Coatings on Aluminum Alloy. (10th December 2012)

• Record Type: Journal Article
• Authors: Kumar, N.; Jyothirmayi, A.; Subasri, R.
• Other Names: Bereket G. Academic Editor.; Du C. Academic Editor.; Hsu C.-H. Academic Editor.; Umoren S. Academic Editor.
• Is Part Of: ISRN corrosion. Volume 2012(2012)
• Publication Date: 2012-12-10
• Subjects: Corrosion and anti-corrosives -- Periodicals; Materials -- Corrosion -- Periodicals; Corrosion and anti-corrosives; Materials -- Corrosion; Electronic journals; Periodicals; 620.11223
• DOI: 10.5402/2012/506560
• Languages: English
• ISSNs: 2090-8903

Abstract

Abstract : A hybrid sol synthesized from an acid-catalyzed hydrolysis and condensation reaction of 3-glycidoxypropyltrimethoxysilane (GPTMS) and zirconium n-propoxide was used as a matrix nanocomposite sol. To this sol, 0.01 M Ce 3+ was added as an inhibitor to provide a self-healing coating system. The effect of an atmospheric air plasma surface pretreatment of aluminum alloy substrates prior to coating deposition of Ce 3+ -doped/undoped GPTMS-ZrO2 sol was studied with respect to corrosion protection. Coatings were generated by a dip coating technique employing a withdrawal speed of 5 mm/s and thermally cured at 130° C for 1 h. The coated Al surfaces were characterized using potentiodynamic polarization studies and electrochemical impedance spectroscopy. They were also subjected to accelerated corrosion testing using neutral salt spray test with 5% NaCl solution after creating an artificial scratch for more than 200 hours to assess the self-healing ability of coatings. It was observed that cerium (III) doping was effective for corrosion protection during long-term exposure to the electrolyte solution, and a plasma surface pretreatment of substrates prior to coating deposition of Ce 3+ -doped coatings improved the adhesion of coatings that provides enhanced corrosion protection along with self-healing ability exhibited in case of damages/scratches caused in the coating.