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US 12,540,383 B2Granted
Modified hot-dip galvanize coatings with low liquidus temperature, methods of making and using the same
AssigneeColorado School of Mines
InventorsJohn Speer, Lijia Zhao
Life of this patent
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Abstract
A metallic material with a first microstructure is coated in a bath with a coating to form a coated metallic material. The coating has a liquidus temperature and the bath has an operating temperature that is higher than the liquidus temperature. The first microstructure of the metallic material is altered by the application of the coating to an alternative microstructure. The coating includes a dopant which acts as a temperature reducing agent.
Claims14
A method of coating a steel or steel alloy material containing ferrite, martensite or bainite as a first microstructure at a reduced bath temperature, comprising:
- providing a steel or steel alloy material;
- simultaneously quenching and coating the steel or steel alloy material in a zinc-based alloy bath with a zinc-based alloy coating including a zinc-based alloy material and at least one dopant to form a coated steel or steel alloy material, wherein a liquidus temperature of the zinc-based alloy coating in the zinc-based alloy bath is between 275° C. and 365° C., and wherein the zinc-based alloy bath has an operating temperature that is between 0° C. and 50° C. higher than the liquidus temperature;
- and
- altering said first microstructure of the ferrite, martensite or bainite in the steel or steel alloy material to form an alternative microstructure by a change in at least one of martensite tempering, bainite tempering, or a lack of carbon aging when coating the steel or steel alloy material with the zinc-based coating.
1 more element
Dependencies are inferred from the claim text.