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A study of the initial stages of atmospheric corrosion of formed hot dip zinc coated steel
Högskolan Dalarna, Akademin Industri och samhälle, Materialvetenskap.
Högskolan Dalarna, Akademin Industri och samhälle, Materialvetenskap.
Högskolan Dalarna, Akademin Industri och samhälle, Materialvetenskap.
1997 (Engelska)Ingår i: EUROCORR-97, Trondheim, Norway, 1997Konferensbidrag, Publicerat paper (Övrigt vetenskapligt)
Abstract [en]

Hot-dip zinc coated steel sheet is extensively used to improve the corrosion protection of steel constructions. When the sheet is formed cracks in the zinc coating develop in strained areas. The zinc coating gives a galvanic protection of the steel in damaged areas of the coating and at cut edges of the sheet. The degree of protection is, however, dependent on factors such as the geometry and the area of the defects, the coating thickness, the presence of corrosive ions in the electrolyte and the wet time. In this work we have studied the initial atmospheric corrosion of zinc coated steel in defects on bended and scribed material. The samples were exposed to a cyclic indoor corrosion test developed by Volvo (Volvo standard 1027). Scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDS) and Auger electron spectroscopy (AES) were used to monitor the initial stages of corrosion and the growth of corrosion products. The corrosion products were identified as predominantly zinc hydroxycarbonate, zinc hydroxychloride and zinc hydroxide. The amount of corrosion products increases with the size of the damaged area, which suggests that the cathodic reduction of oxygen at the steel substrate controls the corrosion rate.

Ort, förlag, år, upplaga, sidor
Trondheim, Norway, 1997.
Nationell ämneskategori
Materialteknik
Identifikatorer
URN: urn:nbn:se:du-2663OAI: oai:dalea.du.se:2663DiVA, id: diva2:521710
Konferens
EUROCORR-97 , Trondheim, Norway, 1997
Tillgänglig från: 2007-04-04 Skapad: 2007-04-04 Senast uppdaterad: 2015-06-08Bibliografiskt granskad

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Carlsson, PerBexell, UlfOlsson, Mikael
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