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Technical Briefs

Stifling of Crevice Corrosion in Alloy 22 During Constant Potential Tests

[+] Author and Article Information
Raul B. Rebak

 GE Global Research, 1 Research Circle, Schenectady, NY 12309

J. Pressure Vessel Technol 131(1), 014501 (Nov 07, 2008) (7 pages) doi:10.1115/1.2967883 History: Received February 02, 2006; Revised June 10, 2007; Published November 07, 2008

Artificially creviced Alloy 22 (N06022) may be susceptible to crevice corrosion in the presence of high-chloride aqueous solutions, especially at higher temperatures and at anodic potentials. The presence of oxyanions in the electrolyte, particularly nitrate, inhibits the nucleation and growth of crevice corrosion. The current results show that crevice corrosion will develop in Alloy 22 when a constant potential above the crevice repassivation potential is applied to a creviced specimen. The analyses of the current output showed the presence of three characteristic domains: (1) passivation or induction time, (2) nucleation and growth, and (3) stifling and arrest. That is, under the tested conditions, crevice corrosion did initiate but after it reached a critical stage of growth, further damage stalled and the output anodic current returned to the passive values before the nucleation of the attack.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

CPP for Alloy 22 at 100°C(23)

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Figure 2

Creviced specimen (PCA)

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Figure 3

Corrosion under one crevice former in Specimen KE0106. The top triangle in the attacked area is the base metal, and the lower part of the attacked area is the weld seam.

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Figure 4

Detail of the IGA attack in the base metal

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Figure 5

Detail of the IDA attack in the weld metal

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Figure 6

Current transients during POT tests. Symbols are markers and do not represent the actual amount of data points.

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Figure 7

Current transients during POT tests

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Figure 8

Power law in Domain 1

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Figure 9

Power law in Domain 2

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Figure 10

Power law in Domain 3

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