| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1469415 | Corrosion Science | 2012 | 8 Pages |
Press hardening of hot-dip-galvanized steel sheet yields an innovative product with high strength and reduced weight with drastically increasing industrial importance. This process results in an austenitisation of the steel and a conversion of the 10 μm Zn layer into a 20 μm thick coating consisting of zinc saturated α-iron and Γ-FeZn-phases. A 5-times longer protection is found in cyclic corrosion tests. The mechanism is a combination of the increase of the coating thickness, cathodic protection and the barrier properties of simonkolleite in the corrosion products. Simonkolleite-Zn5(OH)8Cl2, hydrozincite-Zn5(CO3)2(OH)6 and akaganeite-β-FeOOH were identified as corrosion products by XRD, FT-IR and Raman spectroscopy.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Corrosion performance of press hardened galvanized steel was studied.. ► The thermal–mechanical process forms Zn saturated α-Fe and intermetallic Γ-ZnFe.. ► Cathodic protection of this coating slows down corrosion by a factor of 5.. ► Simonkolleite, hydrozincite, and akaganeite were identified by IR, Raman and XRD.
