The effect of carbon within corrosion pits of iron in chloride solutions

Autor:	Alison J. Davenport, Trevor Rayment, Weichen Xu
Rok vydání:	2017
Předmět:	Mass transport Chemistry 020209 energy General Chemical Engineering Metallurgy Inorganic chemistry chemistry.chemical_element 02 engineering and technology General Chemistry Chloride Corrosion Solution of Schrödinger equation for a step potential Black layer 0202 electrical engineering electronic engineering information engineering medicine General Materials Science Carbon Dissolution medicine.drug
Zdroj:	Corrosion Engineering, Science and Technology. 52:383-390
ISSN:	1743-2782 1478-422X
DOI:	10.1080/1478422x.2017.1304618
Popis:	Iron artificial pits have been used in this work to investigate the effect of a carbon-based black layer that can form within a pit during iron dissolution in HCl solutions. Commercial purity iron (99.5%) and high purity iron (99.99+%) have been compared, and a black layer has been observed only in the 99.5% iron pit. It has been found that the formation of a black layer within an iron artificial pit is potential dependent: it can form at applied voltages below 0.2 V(SCE), but not at 0.6 V(SCE). The presence of a black layer can decrease the rate of mass transport inside a pit, which may help to maintain the aggressive acidic solution in an active pit. This effect has been characterised quantitatively via potentiostatic and potential step methods. In addition, the black layer has also been found to induce a small extra resistance in the solution.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d7e5e47207257ae89f5b09ff77e0c917 https://doi.org/10.1080/1478422x.2017.1304618 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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