Effect of metal ions on the anti-corrosion properties of γ-glycidoxypropyltrimethoxysilane coatings on cold-rolled iron

• Published in: Anti-corrosion methods and materials 2016-03, Vol.63 (2), p.82-88
• Main Authors: Ge, Shengsong, Li, Menglong, Shao, Qian, Liu, Ke, Wang, Junxiang, Yi, Fengjiao
• Format: Article
• Language: English
• Subjects: Aluminum; Analytical methods; Coating effects; Coatings; Cold rolling; Corrosion; Corrosion effects; Corrosion prevention; Corrosion tests; Design analysis; Electrochemical impedance spectroscopy; Electrochemistry; Electrodes; Engineering; Ethanol; Fourier transforms; Functional groups; Galvanized steel; Infrared spectroscopy; Iron; Mechanical engineering; Metal ions; Metals; Microscopy; Properties; Properties (attributes); Salt; Salt spray tests; Sodium; Solutions; Spectrum analysis; Substrates
• ISSN: 0003-5599; 1758-4221
• DOI: 10.1108/ACMM-08-2014-1424

Purpose – This paper aims to clarify the effect of metal ions added in the γ-glycidoxypropyltrimethoxysilane (γ-GPS) solutions on the anti-corrosion properties of the γ-GPS coatings on cold-rolled iron (CRI). Design/methodology/approach – The transformations of functional groups involved in reactions during the coating process were characterized by Fourier transformed infrared spectroscopy (FTIR), and the thickness of the γ-GPS coatings on the CRI substrates was measured using high-powered microscopy. The anti-corrosion properties of γ-GPS-treated samples were evaluated by neutral salt spray tests, polarization curves and electrochemical impedance spectroscopy measurements. Findings – The results show that Zn2+ and Mg2+ in the γ-GPS solutions promote the formation of Si-O-Si and Si-O-Fe bonds and improve the anti-corrosion properties of the γ-GPS coatings on CRI. However, Al3+ and Na+ in the γ-GPS solutions do not play this role. Originality/value – Although there have been previous research studies on the γ-GPS coatings on CRI, this paper is the first to study the effect of metal ions added in the silane solutions on the anti-corrosion properties of the γ-GPS coatings, and it has been confirmed that the anti-corrosion properties changed when Zn2+ (or Mg2+) is present.