Corrosion protective performance of epoxy-amino branched polydimethylsiloxane hybrid coatings on carbon steel

• Published in: Anti-corrosion methods and materials Vol. 61; no. 6; pp. 423 - 430
• Main Author: Mohammad Suleiman, Rami
• Format: Journal Article
• Language: English
• Published: Bradford Emerald Group Publishing Limited 28-10-2014
• Subjects: Ammonium; Ammonium compounds; Ammonium nitrate; Carbon; Carbon steel; Carbon steels; Cerium; Cerium ammonium nitrate; Chlorides; Chromate coatings; Coatings; Contact angle; Corrosion; Corrosion inhibitors; Corrosion prevention; Corrosion rate; Corrosion resistance; Curing; Electrochemical impedance spectroscopy; Electrochemistry; Electrodes; Electrolytes; Engineering; Epoxy compounds; Gels; Inorganic coatings; Mechanical engineering; Mechanical properties; Metal sheets; Morphology; Nitrates; Organic chemistry; Polydimethylsiloxane; Properties; Protective coatings; Sodium chloride; Sol-gel processes; Spectrum analysis; Steel; Substrates; Carbon steel; Amine; Corrosion protection; Epoxy; Polydimethylsiloxane; EIS
• ISSN: 0003-5599; 1758-4221
• DOI: 10.1108/ACMM-08-2013-1296

Purpose
– The purpose of this work was to prepare a hybrid organic/inorganic coating with interesting barrier properties against the corrosion of plain carbon steel sheets in 3.5 per cent NaCl solution. The search for replacing chromates in protective coatings has led to the development of hybrid sol-gel anticorrosive coatings. Appropriate functionalization can dramatically enhance the chemical durability and mechanical strength of these coatings.
Design/methodology/approach
– To prepare the targeted coating, 1,2-epoxybutane (EB) was mixed with 2-4 per cent aminoethylaminopropyl-methylsiloxane dimethylsiloxane copolymer and 1,6-diaminohexane. The above coating (EBAC) was further mixed with three different corrosion inhibitors “Moly-white® 101-ED, Hfucophos Zapp®” and Cerium Ammonium Nitrate, yielding the coatings (EBAC-M), (EBAC-Z) and (EABC-Ce), respectively. The corrosion characteristics of all coatings on carbon steel panels immersed in 3.5 per cent NaCl solution were obtained using different electrochemical methods such as electrochemical impedance spectroscopic and Tafel polarization measurements.
Findings
– The newly prepared coatings showed interesting properties for protecting the steel substrate against corrosion in chloride containing media.
Originality/value
– The results provide a good approach for the modification of polydimethylsiloxane coatings using a simple organic modifier.