Corrosion protection with AL/ZN-based coatings

CORROSION PROTECTION WITH AL/ZN-BASED COATINGS Red rust staining of Al/Zn coated steel strip in "acid rain" or "polluted" environments can be minimised by forming the coating as an Al-Zn-Si-Mg alloy coating with an OT:SDAS ratio greater than a value of 0.5:1, where OT is the over...

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Bibliographische Detailangaben
Hauptverfasser:	NOLAN, David James, WILLIAMS, Joe, SMITH, Ross McDowall, LIU, Qiyang, NEUFELD, Aaron Kiffer, RENSHAW, Wayne, SHEDDEN, Bryan Andrew
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Zusammenfassung:	CORROSION PROTECTION WITH AL/ZN-BASED COATINGS Red rust staining of Al/Zn coated steel strip in "acid rain" or "polluted" environments can be minimised by forming the coating as an Al-Zn-Si-Mg alloy coating with an OT:SDAS ratio greater than a value of 0.5:1, where OT is the overlay thickness on a surface of the strip and SDAS is the measure of the secondary dendrite arm spacing for the Al-rich alpha phase dendrites in the coating. Red rust staining in "acid rain" or "polluted" environments and corrosion at cut edges in marine environments can be minimised in Al-Zn-Si-Mg alloy coatings on steel strip by selection of the composition (principally Mg and Si) and solidification control (principally by cooling rate) and forming Mg 2 Si phase particles of a particular morphology in interdendritic channels.