Abstract

The formation of a protective layer of tow silane coupling agents: γ -methacryloxypropyltrimethoxysilane (γ-MPS) or γ-aminopropyltriethoxysilane (γ-APS) on copper is studied by diffuse reflectance infrared spectroscopy (DRIFT), electrochemical (Potentiodynamic polarization) and gravimetric chemical (Weight loss) measurements. Dried in ambient conditions, the silane adsorbed on the copper subtract physically, however its protective action is not reliable. Thiolate and siloxane band formation ameliorate the protective action of the silanic layer on the surface of copper especially after curing process. Potentiodynamic polarization and Weight loss experiments show that the performances protective action of cured treatment (cured/Cu-silane) is higher than that of aging process (aged/Cu-silane).

Highlights

  • The corrosion behavior of copper and its alloys has been extensively studied for a wide range of experimental conditions

  • RSiðOHÞ3 þ ðR’OÞðOHÞ2SiR ! RSiðOHÞ2–O–ðOHÞ2SiR þ R’OH. These three reactions display the importance of hydrated environment in the condensation reactions taking place between the coupling agent and the metallic surface, and which will take place on the copper surface according to the following reactions (Eqs. (4) and (5)): RSi–OH þ OH–CuðsurfaceÞ ! RSi–O–Cu þ H2O

  • The object of the present study is to investigate the adsorption of γ-MPS and γ-APS onto pure copper at different dried conditions and to study the possibility of using these two-coupling agent’s treatment on copper in order to enhance its corrosion protective performance

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Summary

Introduction

The corrosion behavior of copper and its alloys has been extensively studied for a wide range of experimental conditions. Silane coupling agents are commonly used for the pre-treatment of metal surfaces to increase adhesion between polymeric (i.e., the paint) and inorganic materials (i.e., the metal). This twofold function of the coupling agent is due to their chemical structure, corresponding to general formula R–Si–(OR’), where R is an organo-functional group (amine, mercapto, epoxy, methacrylic, vinyl, etc.) whose role is to establish a chemical band with the organic coating and R’ stands for an alkyl group (generally Et or Me) [3]. These three reactions display the importance of hydrated environment in the condensation reactions taking place between the coupling agent and the metallic surface, and which will take place on the copper surface according to the following reactions The object of the present study is to investigate the adsorption of γ-MPS and γ-APS onto pure copper at different dried conditions and to study the possibility of using these two-coupling agent’s treatment on copper in order to enhance its corrosion protective performance

Experimental
Characterization of silane film formed on copper
Potentiodynamic polarization
Gravimetric measurements
Conclusions
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