Cristin-resultat-ID: 1701543
Sist endret: 18. februar 2020, 14:30
NVI-rapporteringsår: 2019
Resultat
Vitenskapelig artikkel
2019

Progress in Understanding Initiation of Intergranular Corrosion on AA6005 Aluminum Alloy with Low Copper Content

Bidragsytere:
  • Shilpa Kumari
  • Sigurd Wenner
  • John Walmsley
  • Otto Lunder og
  • Kemal Nisancioglu

Tidsskrift

Journal of the Electrochemical Society
ISSN 0013-4651
e-ISSN 1945-7111
NVI-nivå 2

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2019
Publisert online: 2019
Trykket: 2019
Volum: 166
Hefte: 11
Sider: C3114 - C3123
Open Access

Importkilder

Scopus-ID: 2-s2.0-85070659842

Beskrivelse Beskrivelse

Tittel

Progress in Understanding Initiation of Intergranular Corrosion on AA6005 Aluminum Alloy with Low Copper Content

Sammendrag

As part of an extensive research program to study recent, unexpected intergranular corrosion (IGC) on 6xxx series aluminum alloys (AlMgSi), this paper investigates the mechanism of initiation and early propagation of IGC on the extruded AA6005-T5 alloy with small Cu content (0.1 wt%) by use of advanced electron microscopy techniques applied for near surface characterization. Corrosion testing was restricted to the accelerated IGC test according to the standard BS ISO 11846, involving exposure to acidified chloride solution. The effect of modifying the as-received extruded surface by metallographic polishing, argon sputtering, and alkaline etching was investigated. Initiation of IGC was delayed on the as-received surface compared to the modified surface, caused by the presence of an approximately 8 nm thick crystalline oxide layer formed during extrusion. IGC initiated at the primary α-Al(Fe,Cu,Mn)Si particles for all types of surfaces. However, these particles corroded rapidly in the test solution forming a residue of Cu and Si on the exposed particle surface. This phenomenon, as well as enrichment of Cu on the Al matrix surface by dealloying, contributed increasingly to the formation of new effective cathodic sites and continuing propagation of IGC. The AlMgSiCu (Q) phase, present as primary and secondary particles, was relatively inert against both oxidation and reduction.

Bidragsytere

Shilpa Kumari

  • Tilknyttet:
    Forfatter
    ved Institutt for materialteknologi ved Norges teknisk-naturvitenskapelige universitet

Sigurd Wenner

  • Tilknyttet:
    Forfatter
    ved Materialer og nanoteknologi ved SINTEF AS

John Walmsley

  • Tilknyttet:
    Forfatter
    ved Institutt for fysikk ved Norges teknisk-naturvitenskapelige universitet
  • Tilknyttet:
    Forfatter
    ved Materialer og nanoteknologi ved SINTEF AS

Otto Lunder

  • Tilknyttet:
    Forfatter
    ved Materialer og nanoteknologi ved SINTEF AS
  • Tilknyttet:
    Forfatter
    ved Institutt for materialteknologi ved Norges teknisk-naturvitenskapelige universitet

Kemal Nisancioglu

  • Tilknyttet:
    Forfatter
    ved Institutt for materialteknologi ved Norges teknisk-naturvitenskapelige universitet
1 - 5 av 5