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Titolo:
Characterization of black rust staining of unpassivated 55% Al-Zn alloy coatings. Effect of temperature, pH and wet storage
Autore:
Wallinder, IO; He, W; Augustsson, PE; Leygraf, C;
Indirizzi:
Dept Mat Sci & Engn, Div Corros Sci, SE-10044 Stockholm, Sweden Dept Mat Sci & Engn Stockholm Sweden SE-10044 SE-10044 Stockholm, Sweden SSAB Tunnplat AB, SE-78184 Borlange, Sweden SSAB Tunnplat AB Borlange Sweden SE-78184 AB, SE-78184 Borlange, Sweden
Titolo Testata:
CORROSION SCIENCE
fascicolo: 12, volume: 41, anno: 1999,
pagine: 2229 - 2249
SICI:
0010-938X(199912)41:12<2229:COBRSO>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
CORROSION PERFORMANCE; ALUMINUM; STEEL;
Keywords:
Aluzink; zinc; aluminum; SEM/EDS; XRD; XPS; wet storage; alkaline conditions; corrosion products; blackening; rust; alloy;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Wallinder, IO Dept Mat Sci & Engn, Div Corros Sci, Dr Kristinas V 51, SE-10044 Stockholm, Sweden Dept Mat Sci & Engn Dr Kristinas V 51 Stockholm Sweden SE-10044
Citazione:
I.O. Wallinder et al., "Characterization of black rust staining of unpassivated 55% Al-Zn alloy coatings. Effect of temperature, pH and wet storage", CORROS SCI, 41(12), 1999, pp. 2229-2249

Abstract

Wet storage staining is a phenomenon that occurs on both zinc coated and 55% Al-Zn coated steel sheets during shipment or storage in damp conditions. Whereas zinc coated sheets form white corrosion products, 55% Al-Zn coatedsteel sheets form black corrosion products. The effect of temperature, pH and wet storage on the occurrence of black rust staining of unpassivated Aluzink samples has been investigated in the laboratory in terms of corrosionproduct formation and composition. A characterization of corrosion products formed has been performed mainly based on scanning electron microscopy with X-ray microanalyses (SEM/EDS) for morphological and quantitative analyses and X-ray diffraction techniques (XRD) for crystalline phase identification. Black rust formation is strongly related to alkaline pH regions and is enhanced by the temperature. All black panels show the presence of Bayerite(Al(OH)(3)), mainly formed on the aluminum rich dendrite branches and a basic zinc aluminum carbonate (Zn6Al2(OH)(16)CO3. 4H(2)O) formed in the zinc rich interdendritic alloy regions in contact with air. Blackening of Aluzink surfaces is connected to differences in optical properties of embedded metallic zinc and/or aluminum particles of different shape and size in the corrosion layer. (C) 1999 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 11:52:05