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

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.

References

[1]	Machu W (1978) Handbook of Electro painting Technology, Electrochemical Publication, Ltd, London.
[2]	Sankara Narayanan TSN (2005) Surface pretreatment by phosphate conversion coatings—A review. Adv Mater Sci 9: 130–177.
[3]	Saravanan G, Mohan S (2009) Corrosion behavior of Cr electrodeposited from Cr(VI) and Cr(III)-baths using direct (DCD) and pulse electrodeposition (PED) techniques. Corros Sci 51: 197–202.
[4]	Pierce PE (1981) The Physical Chemistry of the Cathodic Electrodeposition Process. J Coat Technol 53: 52–67.
[5]	Vereecken J, Goeminne G, Terryn H, et al. (Eds) (1997) in organic and inorganic coatings for corrosion prevention—Research and Experiences, EFC publication No.20, The institute of Materials, London, p. 103.
[6]	Gominne G, Terryn H, Vereecken J (1995) Characterization of conversion layers on aluminium by means of electrochemical impedance spectroscopy. J Electrochem Acta 40: 479–486.
[7]	Miskovic-Stankovic VB, Stanic MR, Drazic DM (1999) Corrosion protection of aluminium by a cataphoretic epoxy coating. Pro Org Coat 36: 53–63.
[8]	Miskovic-Stankovic VB (2002) The mechanism of cathodic electrodeposition of epoxy coatings and the corrosion behaviour of the electro deposited coatings. J Serb Chem Soc 67: 305–324. doi: 10.2298/JSC0205305M
[9]	He Y, Zhang Y, Wu F, et al. Electrodeposition properties of modified cational epoxy resin-type photoresist, Institute of Photographic Chemistry, Chinese Academy of Sciences, 100101, Beijing, China.
[10]	Krylova I (2001) Painting by electrodeposition on the eve of the 21st century-Review. Pro Org Coat 42: 119–131. doi: 10.1016/S0300-9440(01)00146-1
[11]	ASTM standards D1730-09 (2014) Preparation of aluminum and aluminum alloy surface for Painting.
[12]	Miskovic-Stankovic VB, Drazic DM, Teo dorovic MJ (1995) Electrolyte Penetration Through Epoxycoatings Electrodeposited on Steel. Corros Sci 37: 241–252.
[13]	Miskovic-Stankovic VB, Drazic DM, Kacarevic-Popovic Z (1996) The Sorption Characteristics Of Epoxy Coatings Electrodeposited On Steel During Exposure To Different Corrosive Agents. Corros Sci 38: 513–1523.
[14]	Drazic DM, Miskovic-Stankovic VB (1990) The effect of resin concentration and electrodeposition bath temperature on the corrosion behaviour of polymer coated steel. Pro Org Coat 18: 253–264.
[15]	Lazarevic ZZ, Miskovic-Stankovic VB, Kacarevic-Popovic Z, et al. (2005) Determination of protective properties of electrodeposited organic epoxy coatings on aluminium and modified aluminum surfaces. Corr Sci 47: 823–834. doi: 10.1016/j.corsci.2004.07.016
[16]	Drazic DM, Miskovic-Stankovic VB (1990) The determination of the corrosive behavior of polymer-coated steel with A.C. impedance measurements. Corros Sci 30: 575–582.
[17]	Lazarevic ZZ, Miskovic-Stankovic VB, Kacarevic-Popovic Z, et al. (2005) The study of corrosion stability of Organic Epoxy Protective coatings on Aluminium and Modified Aluminium surfaces. J Braz Chem Soc V 16: 98–102.
[18]	Clark J, McCreery RL (2002) Inhibition of Corrosion-Related Reduction Processes via Chromium Monolayer Formation. J Electrochem Soc 149: B379–386. doi: 10.1149/1.1494825
[19]	Shih T-S, Liu Z-B (2006) Thermally-Formed Oxide on Aluminum and Magnesium. Mater Trans 47: 1347–1353. doi: 10.2320/matertrans.47.1347
[20]	Miskovic-Stankovic VB, Lazarevic ZZ, Kacarevic-Popovic Z, et al. (2002) Corrosion behaviour of epoxy coatings on modified aluminium surfaces. Bull Electrochem 18: 343–348.
[21]	Laget V, Jeffcoate CS, Isaacs HS, et al. (2003) Dehydration-Induced Loss of Corrosion Protection Properties in Chromate Conversion Coatings on Aluminum Alloy 2024-T3. J Electrochem Soc 150: B425–B432. doi: 10.1149/1.1593040
[22]	Campestrini P, Terryn H, Vereecken J, et al. (2004) Chromate Conversion Coating on Aluminum Alloys II: Effect of the Microstructure. J Electrochem Soc 151: B359–369. doi: 10.1149/1.1736682
[23]	Notter IM, Gabe DR (1992) Porosity of Electrodeposited Coatings: its Cause, Nature, Effect and Management. Corr Rev 10: 217–280.

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