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Friction & Wear

Study of Cavitation Erosion Pits on 1045 Carbon Steel Surface in Corrosive Waters

[+] Author and Article Information
S. A. Karrab

Mining and Metallurgical Engineering Department,  Assiut University,Assiut 71516, Egyptsgarrab2005@yahoo.co.uk

M. A. Doheim

Mining and Metallurgical Engineering Department,  Assiut University,Assiut 71516, Egyptmohdoheim@yahoo.com

Mohammed S. Aboraia

Mining and Metallurgical Engineering Department,  Assiut University,Assiut 71516, Egyptmaboraia@hotmail.com

S. M. Ahmed

Mechanical Engineering Department,  Majmaah University,Majmaah 11952, Saudi Arabiashemy2007@yahoo.com

J. Tribol 134(1), 011602 (Feb 24, 2012) (6 pages) doi:10.1115/1.4005646 History: Received December 09, 2010; Accepted November 15, 2011; Published February 10, 2012; Online February 24, 2012

Cavitation erosion resistance of steels is important in many applications. The investigation of such resistance, under different conditions, should be very useful. Cavitation erosion tests were carried out on carbon steel AISI-1045 using an ultrasonic induced cavitation facility. Cavitation erosion pits and their effect on the localized corrosion were investigated in detail in three different corrosive media: distilled water, tap water, and 3% NaCl water.

The results of the investigation using SEM indicated the formation of three types of pits on cavitating specimen surfaces: corrosion pits, erosion pits, and erosion-corrosion pits. The corrosion pits have different shapes, however, the lamellar structure is the dominant structure, and has a large size of about 100 μm. The erosion pits that were formed by the cavitation microjet impacts have sizes of a few micrometers. The erosion-corrosion pits were similar to the corrosion pits, except the erosion pits formed on the corrosion pit surface due to dissolution. The eroded surface removal was the largest in the case of saline water.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

(a) Schematic view of test apparatus, and (b) horn’s disk

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Figure 2

Micrograph representing the ferrite-pearlite microstructure of AISI-1045 carbon steel

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Figure 3

Corrosion pits (Pc ) formed at stationary conditions in: (a) distilled water, (b) tap water, and (c) salt water; the pits are circled in the photograph

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Figure 4

Developed pit shapes: (a) pie shape, (b) annular shape, and (c) lamellar shape

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Figure 5

Corrosion-pit morphology formed in (a) distilled water, (b) tap water, and (c) salt water

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Figure 6

Pits developed under cavitation: (a) corrosion pit (Pc ), (b) erosion pits (Pe ), and (c) Erosion–corrosion pit (Pe-c )

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Figure 7

E-C pit progress with time in the three test media

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Figure 8

Cumulative weight loss with test time in the three test liquids

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Figure 9

The disappearance of the lamellar structure in the erosion corrosion pit areas

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