Effect of pretreatments on electrodeposited epoxy coatings for electronic industries

Sironmani Palraj; Muthaiah Selvaraj; Sundarajan Muthukrishnan; Sironmani Palraj; Muthaiah Selvaraj; Sundarajan Muthukrishnan

doi:10.3934/matersci.2016.1.214

AIMS Materials Science

2016, Volume 3, Issue 1: 214-230. doi: 10.3934/matersci.2016.1.214

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Research article

Effect of pretreatments on electrodeposited epoxy coatings for electronic industries

CSIR-Central Electrochemical Research Institute, Karaikudi-630006-India

Received: 03 November 2015 Accepted: 16 December 2015 Published: 24 February 2016

Abstract
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Waterborne epoxy coatings were prepared on aluminium (Al) surfaces by cathodic electro-deposition on the pretreated surface of pickling, phosphating, chromating and anodizing. The electro-deposition experiments were done at two different voltages, 15 V and 25 V at room temperature in 10% epoxy coating formulations. Corrosion and thermal behavior of these coatings were investigated using electrochemical impedance spectroscopy (EIS) and thermo gravimetric analysis (TGA). The coating exhibits better corrosion resistance in anodized Al surface than the other. But, TGA studies show that the thermal stability is higher in anodized and chromated Al surfaces. The surface morphology of these coatings were analyzed by SEM and AFM studies.
- electrodeposition,
- A.C impedance,
- TGA,
- anodized aluminium,
- phosphating,
- chromating
Citation: Sironmani Palraj, Muthaiah Selvaraj, Sundarajan Muthukrishnan. Effect of pretreatments on electrodeposited epoxy coatings for electronic industries[J]. AIMS Materials Science, 2016, 3(1): 214-230. doi: 10.3934/matersci.2016.1.214

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Abstract

Waterborne epoxy coatings were prepared on aluminium (Al) surfaces by cathodic electro-deposition on the pretreated surface of pickling, phosphating, chromating and anodizing. The electro-deposition experiments were done at two different voltages, 15 V and 25 V at room temperature in 10% epoxy coating formulations. Corrosion and thermal behavior of these coatings were investigated using electrochemical impedance spectroscopy (EIS) and thermo gravimetric analysis (TGA). The coating exhibits better corrosion resistance in anodized Al surface than the other. But, TGA studies show that the thermal stability is higher in anodized and chromated Al surfaces. The surface morphology of these coatings were analyzed by SEM and AFM studies.

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