Saravanan, G. and Mohan, S. and Gnanamuthu, R.M. and Vijayakumar, J. (2008) Effect of AlCl3, CH3SO3H on thickness, current efficiency and corrosion properties of brush plated Cr(III) formate urea baths. Surface Engineering, 24 (6). pp. 458-463. ISSN 0267-0844

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Abstract

Brush plating technique was used to deposit trivalent Cr for the first time and effects of AlCl3 and methane sulphonic acid (CH3SO3H) in the trivalent Cr bath was studied. Advantages of brush plated Cr on suitable substrate produced by selective area deposition process with required thickness was investigated. Owing to its portability, flexibility and easy to operate, brush plating has found increasing use in industry. The main applications are for repair and resizing purposes. Brush plated Cr on brass substrate has been investigated using XRD, SEM and AFM. X-ray diffraction analysis revealed that the brush plated Cr(110) was crystalline. Uniform surface coverage of the substrate by granular morphology was observed from SEM and AFM. CH3SO3H increases the hydrogen overpotential on Cr deposition, therefore current efficiency and thickness increased. Cr coated from bath containing both AlCl3 and CH3SO3H have better corrosion resistance due to high charge transfer resistance Rct and very low Icorr than Cr(III) bath without these additives.

Item Type:	Article
Uncontrolled Keywords:	Coatings; Deposition; Brush plated; Trivalent Cr; Corrosion resistance; Methane sulphonic acid (CH3SO3H)
Subjects:	Industrial Metal Finishing
Divisions:	UNSPECIFIED
Depositing User:	ttbdu cecri
Date Deposited:	20 Jan 2012 22:51
Last Modified:	20 Jan 2012 22:51
URI:	http://cecri.csircentral.net/id/eprint/471

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