Corrosion protection of epoxy-coated steel using different silane coupling agents

• Published in: Journal of applied polymer science Vol. 71; no. 4; pp. 585 - 593
• Main Authors: Jang, Jyongsik, Kim, Eui Kyoon
• Format: Journal Article
• Language: English
• Published: New York John Wiley & Sons, Inc 24.01.1999; Wiley
• Subjects: Applied sciences; Corrosion; Corrosion prevention; corrosion protection; epoxy resin; Exact sciences and technology; Forms of application and semi-finished materials; Metals. Metallurgy; Polymer industry, paints, wood; Sheets and films; silane coupling agent; siloxane linkage; steel corrosion; Technology of polymers; Corrosion protective layer; Humidity effect; Coating material; Epoxy resin; Organic silane; Steel; Experimental study; Corrosion protection; High temperature corrosion; Mechanism; Surface treatment; Coupling agent
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/(SICI)1097-4628(19990124)71:4<585::AID-APP10>3.0.CO;2-D

To suppress steel corrosion at elevated temperature and in humid condition, silane coupling agents N‐β‐aminoethyl aminopropyltrimethoxysilane (AAPS), γ‐glycidoxypropyltrimethoxysilane (GPS), and bis[3‐(trimethoxysilyl)‐1‐phenylpropyl]tetrasulfide (RC‐2) were introduced as primers into an epoxy/steel system. Silane coupling agents and epoxy were coated onto the steel surface using the solution casting method. The polymer degradation and steel corrosion formation after heat and humid treatment were investigated by Fourier transform infrared reflection and absorption spectroscopy (FTIR–RAS) and scanning electron microscopy (SEM). Compared to various silane treated epoxy/steel systems, the AAPS‐treated epoxy/steel (AAPS/epoxy = 6 : 4) system suppressed steel corrosion at 400°C for 10 min in air and for 5 days at 60°C in 100% relative humidity. This is due to the formation of SiOSi linkage and FeOSi bond on steel surface, which are resistant to water diffusion and thermally stable at elevated temperature. The relationship between chemical bonding at the steel–epoxy interface and corrosion protection on the steel surface was also investigated. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 71: 585–593, 1999