Electrochemical Detection of Localized Corrosion

Jones, D. A.; Greene, N. D.

doi:10.5006/0010-9312-25.9.367

Cited by 32 publications

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“…Jones and Greene (25) and Rosenfeld and Marshakov (26) have shown that potential-time measurements of specimens immersed in aqueous solutions can also be used to assess the localized corrosion resistance of alloys. Direct immersion crevice corrosion test of alloy samples in aggressive corrodents such as 10% HC1 -~ 1% FeCI~ have long been used in alloy development studies for screening purposes (27).…”

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confidence: 99%

The Comparative Crevice Corrosion Resistance of Co‐Cr Base Surgical Implant Alloys

Devine

Wulff

1976

J. Electrochem. Soc.

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Different electrochemical and direct immersion tests were used to compare the relative crevice corrosion resistance of currently used or recommended nontitanium surgical implant alloys. Measurement of the anodic corrosion current vs. time of creviced specimens in deaerated isotonic salt solution at 37~ and in a 10% HC1 ~-1% FeC18 solution at a series of constant applied potentials lying in the passive range of the alloys provided the same comparative rating of the different alloys as potential-time measurements as well as direct immersion tests. According to the tests, recently developed stronger wrought versions of the Co-Cr-Mo-C alloy H.S. 21 (modified Vitallium) and a wrought Co-20Cr-10Mo alloy were found to possess greater crevice corrosion resistance in both solutions than as-cast H.S. 21 and wrought alloys such as H.S. 25, M.P. 351~., Elgilloy, and 316L stainless steel.

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confidence: 99%

The Comparative Crevice Corrosion Resistance of Co‐Cr Base Surgical Implant Alloys

Devine

Wulff

1976

J. Electrochem. Soc.

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“…The most notable accelerated test is the cyclic anodic polarization method developed by Wilde and Williams (31). Other applications of polarization methods include detection (34) and prevention (5, 7) of crevice corrosion. Other applications of polarization methods include detection (34) and prevention (5, 7) of crevice corrosion.…”

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confidence: 99%

Initiation of Crevice Corrosion: I . Experimental Investigations on Aluminum and Iron

Siitari

Alkire

1982

J. Electrochem. Soc.

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The mechanism of passivity breakdown within crevices was investigated for aluminum in 0.05M NaC1 and for iron in dilute mixtures of NaC1, Na2SO4, and NaNO2. The pH, electrode potential, and current distribution were monitored continuously in segmented crevices which simulated realistic corrosion conditions. Variation in the crevice geometry was found to have a significant effect on the current distribution behavior during initiation of crevice corrosion. Breakdown of passivity on aluminum typically took place within a matter of hours and was accompanied by hydrogen bubble evolution within the crevice at a pH near 4.1. The behavior for iron was qualitatively different than that for aluminum, indicating that the mechanism of passivity breakdown is different for the two metals.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 138.251.14.35 Downloaded on 2015-03-24 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 138.251.14.35 Downloaded on 2015-03-24 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 138.251.14.35 Downloaded on 2015-03-24 to IP

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“…The mechanism of crevice corrosion in an 0 2-CL system (e.g., a marine environment) has been proposed as follows [3][4][5][6][7][8] : (1) depletion of 02 in the crevice solution, (2) increase in acidity and the Clconcentration of the crevice solution, (3) breakdown of the passive film, and (4) propagation of crevice corrosion by active dissolution. The crevice corrosion in a H 2 S-CIenvironment is thought to be basically similar to that in an 02-C1 environment 10 :…”

Section: Effect Of Ni Cr and Mo On The Occurrence Of Crevice Corrosionmentioning

confidence: 99%

“…Crevice corrosion, which is the most serious corrosion problem in marine environments, is especially important because it occurs in milder condition than pitting corrosion does. [3][4][5][6][7] However, few papers have reported on crevice corrosion in H 2 S-CIenvironments. e ' 9 In our previous work, the crevice corrosion of duplex SSs was investigated in H2S-CL environments and the effects of environmental variables were clarified.…”

Section: Introductionmentioning

confidence: 98%

Crevice Corrosion of Corrosion-Resistant Alloys in Simulated Sour Gas Environments

Azuma¹,

Kudo²

1991

CORROSION

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BSTRACT Crevice corrosion behaviors of corrosion-resistant alloys (CRAs) with various Ni, Cr, and Mo contents were investigated in conditions simulating the sour gas environment encountered in oil and gas production. Crevice corrosion occurred more easily in a 0.1 MPa H2S environment than in a 1.0 MPa H 2 S environment. Ni, Cr, and Mo all improved crevice corrosion resistance in electrochemical and immersion tests. The improving effect of Ni and Cr on crevice corrosion resistance reached saturation at 20 percent of their contents. The effect of Mo was remarkable. Alloys containing more than 6% Mo exhibited excellent crevice corrosion resistance, which could not be achieved by the increment in Ni and Cr contents. The onset of the crevice corrosion on CRAs in H2 S-CIenvironment was investigated by electrochemically studying the pH drop in the crevice solution and the depassivation pH (pH d).These are considered to determine the extent of crevice corrosion resistance in comparison to that in 0 2-C1 environment. The effect of Ni on crevice corrosion differed in H 2 S-Cland 02-Cl environments. It was proven that Ni accelerates the pH drop and raises the pHd inside crevices by reducing the H 2 S concentration through Ni-S compound formation in H 2 S-CIenvironments.It has been shown that the crevice corrosion frequency from the immersion test in 0.1 MPa H 2 S was better correlated with the pHd in the deaerated solution rather than the pH d in the H2S containing solution. The crevice corrosion resistance under 0.1 and 1 MPa H2 S is discussed in relation to the pH d dependent on the H2 S concentration in the crevice.An immersion test was conducted in the 1 0-L autoclave (Figure 2). The test specimen (Figure 1[b]) had 20 metal/PTFE

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Electrochemical Detection of Localized Corrosion

Cited by 32 publications

References 0 publications

The Comparative Crevice Corrosion Resistance of Co‐Cr Base Surgical Implant Alloys

The Comparative Crevice Corrosion Resistance of Co‐Cr Base Surgical Implant Alloys

Initiation of Crevice Corrosion: I . Experimental Investigations on Aluminum and Iron

Crevice Corrosion of Corrosion-Resistant Alloys in Simulated Sour Gas Environments

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