A study of the initial stages of atmospheric corrosion of formed hot dip zinc coated steel

Document identifier: oai:dalea.du.se:2663
Keyword: Engineering and Technology, Materials Engineering, Teknik och teknologier, Materialteknik
Publication year: 1997
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Abstract:

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.

Authors

Per Carlsson

Högskolan Dalarna; Materialvetenskap
Other publications >>

Ulf Bexell

Högskolan Dalarna; Materialvetenskap
Other publications >>

Mikael Olsson

Högskolan Dalarna; Materialvetenskap
Other publications >>

Hans Klang

Other publications >>

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        identifier: oai:dalea.du.se:2663
        datestamp: 2021-04-15T12:34:45Z
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                version: 3.7
            recordInfo: 
                recordContentSource: du
                recordCreationDate: 2007-04-04
            identifier: http://urn.kb.se/resolve?urn=urn:nbn:se:du-2663
            titleInfo: 
                @attributes: 
                    lang: eng
                title: A study of the initial stages of atmospheric corrosion of formed hot dip zinc coated steel
            abstract: 
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.

            subject: 
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                        lang: eng
                        authority: uka.se
                    topic: 
                        Engineering and Technology
                        Materials Engineering
                    @attributes: 
                        lang: swe
                        authority: uka.se
                    topic: 
                        Teknik och teknologier
                        Materialteknik
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                languageTerm: eng
            genre: 
                conference/other
                vet
            note: 
                Published
                4
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                        type: personal
                        authority: du
                    namePart: 
                        Carlsson
                        Per
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                        roleTerm: aut
                    affiliation: 
                        Högskolan Dalarna
                        Materialvetenskap
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                        Bexell
                        Ulf
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                        roleTerm: aut
                    affiliation: 
                        Högskolan Dalarna
                        Materialvetenskap
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                        type: personal
                        authority: du
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                        Olsson
                        Mikael
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                        roleTerm: aut
                    affiliation: 
                        Högskolan Dalarna
                        Materialvetenskap
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                        Klang
                        Hans
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                dateIssued: 1997
                place: 
                    placeTerm: Trondheim Norway
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                titleInfo: 
                    title: EUROCORR-97
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