Improvement of Mechanical and Anticorrosion Coating Properties in Conducting Polymer Poly(Propyl Methacrylate) Embedded
- PDF / 1,849,506 Bytes
- 15 Pages / 595.276 x 790.866 pts Page_size
- 77 Downloads / 176 Views
ORIGINAL PAPER
Improvement of Mechanical and Anticorrosion Coating Properties in Conducting Polymer Poly(Propyl Methacrylate) Embedded with Silane Functionalized Silica Nanoparticles Joseph Raj Xavier 1 Received: 18 May 2020 / Accepted: 28 August 2020 # Springer Nature B.V. 2020
Abstract An excellent new nanocomposite coating consisting of poly(propyl methacrylate) (PPMA), silanes and SiO2 nanoparticles (i.e., PPMA/silane/SiO2 blend) for aluminium alloy (AA7178) protection in natural seawater is investigated by electrochemical techniques. Three different silanes namely, ethyltriethoxysilane (EES), (3-glycidyloxypropyl)triethoxysilane (GES), and (3aminopropyl)triethoxysilane (AES) were used to prepare functionalized SiO2 nanoparticles which are incorporated into PPMA to form PPMA/EES/SiO2, PPMA/GES/SiO2, and PPMA/AES/SiO2 nanocomposites. Electrochemical impedance spectroscopy (EIS) displayed a pronounced increase in the charge transfer resistance and potentiodynamic polarisation studies showed a significant decrease in the corrosion current for the investigated nanocomposites. The resultant nanocomposites performed as an excellent passivation layer which prevents the diffusion of ions and slows down the corrosion process due to the inclusion of silane functionalized SiO2 nanoparticles to PPMA. Scanning electrochemical microscopic (SECM) studies showed very lower corrosion current at the scratch of the PPMA-silane/SiO2 nanocomposite coated aluminium alloy. Field emission-scanning electron microscopy/energy dispersive X-ray (FE-SEM/EDX) analysis displayed the formation of corrosion products as the passive layer that hinders the dissolution of aluminium alloy. Mechanical properties of the coated aluminium alloy were found to be enhanced by the inclusion of functionalized SiO2 nanoparticles to PPMA which complimented the electrochemical studies. Keywords Poly(propyl methacrylate) . SiO2 . Silanes . Nanocomposite coatings . Corrosion . Adhesion . SECM
1 Introduction Aluminium alloys are used in various fields, especially aerospace industry, medical sciences and automobile industries due to their distinct properties. Their light weightiness, excellent flexibility, good specific strength-to-weight ratio, and good magnetic shielding properties are the main reasons for their applications. The lower corrosion resistance of aluminium alloys prevents their applications in various fields of industry. The corrosion of Al alloys in aqueous medium can be
* Joseph Raj Xavier [email protected] 1
Department of Chemistry, Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology, Avadi, Chennai, Tamil Nadu 600 062, India
accelerated in the presence of chloride ions [1, 2]. Surface modification of nanoparticles by epoxy coatings, sol-gel coatings, and organic coatings is used for the corrosion protection of different kinds of alloys like Mg and Al alloys [3–10]. Generally, the presence of copper and silicon in the aluminium alloys results in the enhanced corrosion protection and mechanical properties. Va
Data Loading...
