Polymeric Organo-Silane Coatings for Aluminum Alloy Corrosion Protection by Self-Assembled Metho

Yabin Wang,Yanni Li,Fang Wang

doi:10.1155/2012/548143

Yabin Wang, Yanni Li + Show 1 more

Open Access

https://doi.org/10.1155/2012/548143

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Abstract

The protective performances of coating formed by organo-silane with a linear alkyl chain for promoting aluminum alloy corrosion protection were evaluated by electrochemical techniques. The coatings were self-assembled in the hydrolyzed hydroalcoholic bath ofn-octyltriethoxysilane (OS) and cured at hot air oven by different time. The coatings prepared by the less self-assembled number and shorter cured time, were always porous and scarcely protective. On the contrary, those built by the more self-assembled number and the longer cured time had higher coverage on aluminum surface and favorable corrosion resistant property. The best results were obtained whenn-octyltri-ethoxysilane (OS) was hydrolyzed 25 h, self-assembling of OS was conducted for five times and the multi-layers were cured at 120 for 1∼2 hours. In this case, the thicker, high cross-linked and more scarcely defective layer was formed on aluminum alloy surface.

Highlights

Aluminum and its alloys are widely used as industrial metal materials because of their appearance, low density, high strength, easy machining and corrosion resistance
The self-assembled polymeric film can not be prepared on aluminum surface when the unhydrolyzed n-octyltriethoxysilane solution is used
It is seen that the anodic current density has been largely reduced and the Ecorr has shifted to more positive values by means of the five times self-assembly in the OS solution compared to the bare Al 5052 and samples treated with more little self -assembled number, showing an favorable inhibitive effect of OS

Summary

Introduction

Aluminum and its alloys are widely used as industrial metal materials because of their appearance, low density, high strength, easy machining and corrosion resistance. The effect of dipping time, self-assembled number and curing time on polymeric OS films has been investigated. The corrosion protection performances of polymeric OS films are studied by the polarization and cyclic voltammetry curve.

Results

Conclusion