Raj, V. and Kanagaraj, D. and Mohan, S. (2003) Effect of sealing agents on the corrosion behaviour of sulphamic acid anodized alumina films. Transactions of the Institute of Metal Finishing, 81 (03). pp. 83-88. ISSN 0020-2967

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Abstract

AA 1100 aluminium alloy has been anidized in sulphamic acid electrolyte and sealed in triethanolamine (TEA). Sealing has also been carried out in generally used dichromate and boiling water solutions for comparison. The quality of the sealed aluminium oxide films has been assessed using Electrochemical Impedance Spectroscopy with and without exposure to 3% NaCl solution for 168 hours. From the impedance spectra, the polarisation resistance Rp and the double layer capacitance Cdl have been determined. The corrosion resistance behaviour of TEA sealing for various sealing times such as 5, 10 and 15 minutes has been compared with that of dichromate and boiling water sealings. Based on the experimental results, it was concluded that sealing in triethanolamine offered better corrosion resistance indicating it to be the best sealing medium compared to dichromate and boiling water for all sealing times. Also the corrosion resistance of the sealed anodized aluminium decreases with exposure time for all sealings and sealing times. Damage function of the oxide film sealed in different sealing agents and sealing time also confirms that TEA is the best sealing medium compared to dichromate and boiling water sealing

Item Type:	Article
Uncontrolled Keywords:	Anodizing; Aluminium; Sulphamic acid; Sealing; Triethanolamine; Electrochemical Impedance Spectroscopy
Subjects:	Corrosion Science and Engineering
Divisions:	UNSPECIFIED
Depositing User:	ttbdu cecri
Date Deposited:	04 May 2012 11:31
Last Modified:	04 May 2012 11:31
URI:	http://cecri.csircentral.net/id/eprint/2490

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