B K , Prasad and Dr., O. P. Modi and Dr., Mohini Sexena and Dr., A K Jha (1993) Erosion-Corrosion Characteristics of an Aluminium Alloy - Alumina Fibre Composite. Wear, 169. pp. 119-124. ISSN 0043-1648

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Abstract

The present paper describes the erosion-corrosion behaviour of an aluminium alloy (BS: LM 5) and its composite containing 10 vol.% alumina fibres. Tests were performed in 3% NaCl solution with and without sand particles (10 wt.%) using the rotating sample method. Salt immersion and potentiodynamic polarization studies of the specimens were also carried out in 3% NaCl solution. Both the tests showed increased weight loss with test duration. The composite suffered from more material loss than the base alloy. The erosion-corrosion test revealed a significantly higher extent of weight loss in the specimens as compared to the immersion test in an identical electrolyte (3% NaCl). Corrosion of the samples proceeded by the breaking-off of the oxide layer followed by nucleation of micropits and crater formation. Further, the composite suffered from additional attack by the electrolyte at the dispersoid-matrix interfaces. The potentiodynamic study indicated only a nominal shift in the corrosion potential of the composite, while a considerable increase in the corrosion current density of the base alloy was observed due to the incorporation of A120, fibres. The presence of the alumina fibres in the matrix alloy increased the susceptibility of the composite towards pitting (at the fibre-matrix interface). In erosion-corrosion tests, weight loss of the samples was accelerated by the ~pingement of the electrolyte at corroded sites leading to easy removal of corrosion products from the surface. The presence of sand particles in the electrolyte further accelerated the process of material removal due to rapid formation of pits and craters and (partial) removal of alumina fibres from the surface. Four stages of erosion-corrosion, namely (1) incubation period, (2) accelerated erosion-corrosion, (3) deceleration period and (4) steady state material loss, were observed during the erosion-corrosion tests.

Item Type:	Article
Subjects:	Material/Component Development, Processing and Characterization > Tribology
Divisions:	UNSPECIFIED
Depositing User:	Mr. B.K. Prasad
Date Deposited:	20 Aug 2013 08:24
Last Modified:	13 Feb 2014 11:51
URI:	http://ampri.csircentral.net/id/eprint/419

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