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dc.contributor.authorHagen, Catalina Hoem Musinoi
dc.contributor.authorHognestad, Asbjørn
dc.contributor.authorKnudsen, Ole Øystein
dc.contributor.authorSørby, Knut
dc.identifier.citationProgress in organic coatings. 2019, 130 (5), 17-23.nb_NO
dc.description.abstractBy incorporating periodic micro-patterns on steel substrates, the effect of surface roughness on corrosion resistance of a two-component polyamine cured epoxy mastic coating has been studied. Machining was employed to pattern the surfaces with periodic peaks of varying peak-to-valley heights, Rz. The focus of the study was to find the surface parameter that contributes most to the stability of an organic coating in corrosive environment, and to evaluate if machining can be comparable to blast cleaning with respect to coating durability. A strong correlation between roughness (Rz) and corrosive delamination of coated surfaces was seen. Increasing Rz from 57 μm to 252 μm on surfaces with triangular peaks, increased the effective contact area by 40% and decreased delamination by 30%. By introducing tilted asperities at Rz = 224 μm while keeping the effective contact area in general unchanged, delamination decreased another 55%. Hence, an increased Rz is found to be only partially beneficial, and the profile shape is more significant than the roughness value per se. The results suggest that mechanical interlocking has a substantial influence on the interfacial stability of protective coatings in corrosive environments. By optimal selection of cutting parameters, machining can give surfaces where protective coatings have long lifetime.nb_NO
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internasjonal*
dc.titleThe effect of surface roughness on corrosion resistance of machined and epoxy coated steelnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.subject.nsiVDP::Materialteknologi: 520nb_NO
dc.subject.nsiVDP::Materials science and engineering: 520nb_NO
dc.source.journalProgress in organic coatingsnb_NO
dc.relation.projectNorges forskningsråd: 235239nb_NO
dc.description.localcode© 2019. This is the authors’ accepted and refereed manuscript to the article. Locked until 25 January 2021 due to copyright restrictions. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
cristin.unitnameInstitutt for maskinteknikk og produksjon

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Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal