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Research Papers: Applications

Synergistic Erosion–Corrosion Behavior of X-65 Carbon Steel at Various Impingement Angles

[+] Author and Article Information
A. Pasha

School of Metallurgy and Materials Engineering,
Faculty of Engineering,
University of Tehran,
Tehran 14399-57131, Iran
e-mail: am.pasha@ut.ac.ir

H. M. Ghasemi

School of Metallurgy and Materials Engineering,
Faculty of Engineering,
University of Tehran,
Tehran 14399-57131, Iran
e-mail: hghasemi@ut.ac.ir

J. Neshati

Research Institute of Petroleum Industry,
Tehran 14857-33111, Iran
e-mail: neshatij@ripi.ir

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received August 8, 2015; final manuscript received March 18, 2016; published online August 16, 2016. Assoc. Editor: Daniel Nélias.

J. Tribol 139(1), 011105 (Aug 16, 2016) (7 pages) Paper No: TRIB-15-1291; doi: 10.1115/1.4033336 History: Received August 08, 2015; Revised March 18, 2016

A slurry impingement rig containing 6 wt.% SiO2 particles was used to investigate synergistic erosion–corrosion behavior of X-65 carbon steel at various impingement angles. Maximum erosion–corrosion and erosion rates occurred at impingement angles of about 25 deg and 40–55 deg, respectively. The synergy value highly depended on the impingement angle. The formation of patches of porous corrosion product followed by the formation of corrosion pits led to a positive synergy under impingement angle of 25 deg. At higher impingement angles, the absence of pits probably due to the formation of a more durable tribocorrosion layer resulted in a negative synergy.

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Figures

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Fig. 1

Schematic of the erosion–corrosion loop; 1: electro pump, 2: reference electrode in capillary, 3: counter electrode, 4: sample, 5: nozzle, 6: slurry entrance to the container, 7: potentiostat, and 8: exit valve

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Fig. 2

Raw silica sand particles used for erosion–corrosion and pure erosion tests

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Fig. 3

Erosion–corrosion (T) and pure erosion rates (W0) of X-65 carbon steel as a function of impingement angle in 3.5 wt.% NaCl solution containing 6 wt.% SiO2 at a jet velocity of 6.5 m/s for 30 mins

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Fig. 4

(a) SEM micrograph of the polished surface of the X-65 carbon steel before erosion–corrosion test, (b)–(e) SEM micrographs of eroded surface of X-65 carbon steel at different magnifications in 3.5 wt.% NaCl solution containing 6 wt.% SiO2 at a jet velocity of 6.5 m/s, at impingement angle of 25 deg for 30 mins, and (f) in-lens micrograph of the regions where the corrosion product formed

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Fig. 5

Erosion–corrosion surfaces of X-65 carbon steel tested in 3.5 wt.% NaCl solution containing 6 wt.% SiO2, at a jet velocity of 6.5 m/s for 30 mins at: (a) and (b) an impingement angle of 55 deg at different magnifications and (c) and (d) an impingement angle of 90 deg at different magnifications

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Fig. 6

Eroded surfaces of X-65 carbon steel under cathodic protection (pure erosion) in 3.5wt.% NaCl solution containing 6 wt.% SiO2, at a jet velocity of 6.5 m/s for 30 mins: (a) and (b) at 25 deg, (c) and (d) at 55 deg, (e) and (f) at 90 deg impingement angles at different magnifications

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Fig. 7

Oxygen content of eroded surfaces of X-65 carbon steel tested in various conditions. E-C and E indicate the erosion–corrosion and the pure erosion conditions, respectively.

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Fig. 8

Polarization curves for X-65 carbon steel tested in 3.5 wt.% NaCl solution containing 6 wt.% SiO2, at a jet velocity of 6.5 m/s at various impingement angles. The polarization curves in stagnant and flow (i.e., 6.5 m/s) solution of 3.5 wt.% NaCl are also included.

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Fig. 9

Synergy value for X-65 carbon steel tested in 3.5 wt.% NaCl solution containing 6 wt.% SiO2 at a jet velocity of 6.5 m/s for 30 mins

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Fig. 10

Synergism parameters for X-65 carbon steel alloy tested in 3.5 wt.% NaCl solution containing 6 wt.% SiO2 at a jet velocity of 6.5 m/s for 30 mins

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