Treating Al/Zn-based alloy coated products
AssigneeBluescope Steel Limited
InventorsQiyang Liu, Ross McDowall Smith, Bryan Andrew Shedden
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Abstract
A method of treating an Al/Zn-based alloy coated product that includes an Al/Zn-based alloy coating on a substrate is disclosed. The method includes the steps of rapid intense heating of the alloy coating for a very short duration, and rapid cooling of the alloy coating, and forming a modified crystalline microstructure of the alloy coating.
Claims42
A method of treating an Al/Zn-based alloy coated product that includes an Al/Zn-based alloy coating of 2-100 μm thickness on a steel strip to enhance the corrosion resistance of the coating, which method includes the steps of:
- (a) heating the alloy coating at a heating rate of at least 500° C./s for less than 200 milliseconds, and
- (b) cooling the alloy coating at a cooling rate of at least 100° C./s, and forming a modified crystalline microstructure of the alloy coating.
A method of treating an Al/Zn-based alloy coated product that includes an Al/Zn-based alloy coating of 2-100 μm thickness on a steel strip to enhance the corrosion resistance of the coating, which method includes the steps of:
- (a) heating the alloy coating without heating the steel strip, and
- (b) cooling the alloy coating at a cooling rate of at least 100° C./s by using the steel strip as a heat sink,
- and forming a modified crystalline microstructure of the alloy coating.
Dependencies are inferred from the claim text.