The Role of the Metal-Ion Concentration Cell in Crevice Corrosion

Schäfer, Gudrun; Foster, P. K.

doi:10.1149/1.2427383

Cited by 6 publications

(1 citation statement)

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“…Also, new pits or crevices have been observed to initiate on the periphery of pit or crevices that have become clogged. The usual explanation is that this is the result of new, localised, differential aeration cells forming around the previous crevice or pit mouth [6,48], although other authors claim the mechanism is still not understood [49]. In principle the process could recycle with time.…”

Section: Discussionmentioning

confidence: 99%

Bi-modal trends in the long-term corrosion of copper and high copper alloys

Melchers

2015

Corrosion Science

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The evolution of corrosion loss and maximum pit depth of copper and copper alloys exposed for long periods of time in natural and industrial environments is shown to be more consistent with a bi-modal functional form than with the classical power law. Data from several long-term exposure test programs supports this proposition. The bi-modal behaviour signals a change from mainly cathodic oxygen reduction to a subsequent transitory corrosion process that may be modelled as involving pitting under earlier copper corrosion products. Possible reasons for some data sets showing decreasing maximum pit depths with increasing exposure time are discussed.

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Section: Discussionmentioning

confidence: 99%

Bi-modal trends in the long-term corrosion of copper and high copper alloys

Melchers

2015

Corrosion Science

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Corrosion products of reverse crevice corrosion of copper

Lü

2011

Int J Miner Metall Mater

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Open-circuit potential measurements and Raman spectroscopy were used to investigate the reverse crevice corrosion phenomenon and its corresponding corrosion products. With the aid of these techniques, the existence of reverse-crevice corrosion in copper was verified, i.e., while the surface of a crevice was corrosion free, the outside surface of the copper was attacked. The processes associated with this phenomenon were classified into three phases, and different compositions of the corrosion products were determined. Raman spectra showed that copper and Cu 2 O were found in the crevice, while CuO, Cu 2 O, and CuCl 2 were the corrosion products on the bold surface. Based on these findings, a hypothesis relating to the three phases of reverse crevice corrosion has been proposed.

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