CORROSION PROTECTION WITH AL / ZN-BASED COATINGS

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United States of America Patent

APP PUB NO 20120088115A1
SERIAL NO

13255965

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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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 Mg2 Si phase particles of a particular morphology in interdendritic channels.

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Patent Owner(s)

Patent OwnerAddress
BLUESCOPE STEEL LIMITEDMELBOURNE VIC 3000

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Liu, Qiyang New South Wales, AU 38 48
Neufeld, Aaron Kiffer New South Wales, AU 17 6
Nolan, David James New South Wales, AU 5 3
Renshaw, Wayne New South Wales, AU 17 16
Shedden, Bryan Andrew New South Wales, AU 5 13
Smith, Ross McDowall New South Wales, AU 18 20
Williams, Joe New South Wales, AU 31 32

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