Radial Spreading of Localized Corrosion-Induced Selective Leaching on alpha-Brass in Dilute NaCl Solution
2013 (English)In: Corrosion, ISSN 0010-9312, Vol. 69, no 5, 468-476 p.Article in journal (Refereed) Published
The radial spreading of selective leaching on an a-brass alloy, Cu20Zn, in diluted sodium chloride (NaCl) has been followed in situ by light optical microscopy. The corrosion process initiates through localized dissolution of micrometer-sized, Zn-rich areas. These areas initially act as anodes, where the Zn will dissolve as Zn2+. The continued growth is a highly dynamic process, involving dezincification that results in local ennoblement of initial anode areas and changes in the local chemistry of the solution. These changes drive the anodic area outward to form a ring-shaped anode with an increasing diameter. At a sufficiently high local Cl- ion concentration, Cu dissolves as CuCl2-, whereby the radial growth continues. At critical minimum local Cl- ion concentration, the radial growth is terminated.
Place, publisher, year, edition, pages
2013. Vol. 69, no 5, 468-476 p.
leaching, light optical microscopy, localized corrosion, sodium chloride
Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:kth:diva-123622DOI: 10.5006/0611ISI: 000318619600004ScopusID: 2-s2.0-84877678067OAI: oai:DiVA.org:kth-123622DiVA: diva2:628513
FunderSwedish Research Council, 621-2009-3240
QC 201306142013-06-142013-06-132014-09-15Bibliographically approved