Zinc alloy plated steel material having excellent corrosion resistance after being processed

Patent metadata

Field	Value
Publication number	US-11566314-B2
Application number	US-201816771097-A
Country	US
Kind code	B2
Filing date	Dec 13, 2018
Priority date	Dec 26, 2017
Publication date	Jan 31, 2023
Grant date	Jan 31, 2023

Abstract

Provided is a plated steel material which can be used for an automobile, a household appliance, a building material, and the like and, more particularly, to a zinc alloy plated steel material having excellent corrosion resistance after being processed and a method for manufacturing the same.

First claim

The invention claimed is:

1. A zinc alloy plated steel material having excellent corrosion resistance after being processed, comprising:
a base steel;
a zinc alloy plated layer formed on the base steel; and
an inhibition layer formed between the base steel and the zinc alloy plated layer,
wherein the zinc alloy plated layer comprises, by wt %, 0.5% to 3.5% of magnesium (Mg), 0.5% to 11.0% of aluminum (Al), 10 wt ppm to 350 wt ppm of silicon (Si), a remainder of zinc (Zn) and inevitable impurities,
the inhibition layer comprises a Si-concentrated layer, and
a number of Mg 2 Si phases between the base steel and the zinc alloy plated layer, having a diameter greater than 1000 nm, is 5 or less per 100 μm.

2. The steel material of claim 1 , wherein a number of Mg 2 Si phases between the base steel and the zinc alloy plated layer, having a diameter greater than 500 nm, is 5 or less per 100 μm.

3. The steel material of claim 1 , wherein Si is solid-solubilized in the Si-concentrated layer.

4. The steel material of claim 1 , wherein the Si-concentrated layer is formed in a lower portion of the inhibition layer.

5. The steel material of claim 1 , wherein the inhibition layer includes intermetallic compounds of Fe and Al.

6. The steel material of claim 5 , wherein the inhibition layer further includes Si solid-solubilized in the intermetallic compounds.

Assignees

• Posco
• Posco Co Ltd

Inventors

• Sohn Il-Ryoung
• Kim Tae-Chul
• Kim Jong-Sang

Classifications

• C22C38/02

  containing silicon · CPC title

• C21D8/0273

  Final recrystallisation annealing · CPC title

• B32B15/04

  comprising metal as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a bituminous or tarry layer B32B11/08; next to a water-setting substance layer B32B13/06; next to a glass layer B32B17/061; next to a cellulosic plastic layer B32B23/042)} · CPC title

• Y10T428/12958

  Next to Fe-base component · CPC title

• B32B15/01

  all layers being exclusively metallic {(making layered metal workpieces by pressure cladding B23K20/22; making coatings with a metallic material characterised by its composition C23C30/00)} · CPC title