Supercharge Your Innovation With Domain-Expert AI Agents!

Molten al-zn-mg-si-plated steel sheet and manufacturing method therefor

A manufacturing method, hot-dip coating technology, applied in the hot-dip coating process, superimposed layer coating, coating, etc., can solve the problems of inability to ensure corrosion resistance, large coating film expansion, etc., and achieve good corrosion resistance, Excellent corrosion resistance effect

Active Publication Date: 2017-10-13
JFE GALVANIZING & COATING CO LTD +1
View PDF10 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the outer panel using hot-dip Al-Zn-plated steel sheet is damaged, the selective corrosion between dendrites containing a large amount of Zn at the coating / plating interface will occur starting from the damaged part. Compared with Zn plating, the film expansion is significantly larger, and sufficient corrosion resistance (corrosion resistance after coating) may not be ensured

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Molten al-zn-mg-si-plated steel sheet and manufacturing method therefor
  • Molten al-zn-mg-si-plated steel sheet and manufacturing method therefor
  • Molten al-zn-mg-si-plated steel sheet and manufacturing method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] Using a cold-rolled steel sheet with a thickness of 0.5 mm produced by a conventional method as a base steel sheet, hot-dip Al-Zn-Mg-Si steel sheets of Samples 1 to 57 were produced in a continuous hot-dip coating facility.

[0114] Manufacturing conditions (plating bath temperature, first cooling temperature, cooling rate) and conditions of the coating film (composition, Mg 2 Major diameter of Si, Mg 2 Minor diameter / major diameter of Si, thickness of plating film, left side of formula (1) and formula (2) above, Mg in main layer 2 Si content, Mg in the cross-section of the main layer 2 Area ratio of Si, Mg 2 Table 1 shows the strength ratio of Si to Al and the film thickness of the interface alloy layer).

[0115] In addition, the bath temperature of the coating bath was 590 degreeC in manufacture of all the hot dip plated Al-Zn-Mg-Si steel sheets which are samples.

[0116] In addition, about sample 10, the process of holding|maintaining at 200 degreeC for 30 minu...

Embodiment 2

[0140] A plurality of samples (see Table 2 for the sample numbers) of the hot-dipped Al-Zn-Mg-Si steel sheets manufactured in Example 1 were applied with a polyurethane resin-based chemical conversion coating (CT-E manufactured by Nihon Parkerizing Co., Ltd. -364). It should be noted that the adhesion amount of the chemical conversion coating is 1g / m 2 .

[0141] Manufacturing conditions (plating bath temperature, first cooling temperature, cooling rate) and conditions of the coating film (composition, Mg 2 Major diameter of Si, Mg 2 Minor diameter / major diameter of Si, thickness of plating film, left side of formula (1) and formula (2) above, Mg in main layer 2 Si content, Mg in the cross-section of the main layer 2 Area ratio of Si, Mg 2 Table 2 shows the strength ratio of Si to Al and the film thickness of the interface alloy layer).

[0142] (Evaluation of Chemical Conversion Corrosion Resistance)

[0143] (1) Evaluation of corrosion resistance of flat plate and end...

Embodiment 3

[0160] For the sample of the hot-dipped Al-Zn-Mg-Si steel plate that applied the chemical conversion coating produced in Example 2, a 5 μm epoxy resin-based primer layer (manufactured by Nippon Fine Coatings Co., Ltd. JT- 25) A 15 μm melamine-cured polyester-based top coat (NT-GLT manufactured by Nippon Fine Coatings Co., Ltd.) was dried to produce a sample of a coated steel sheet.

[0161] Manufacturing conditions (plating bath temperature, first cooling temperature, cooling rate) and conditions of the coating film (composition, Mg 2 Major diameter of Si, Mg 2 Minor diameter / major diameter of Si, thickness of plating film, left side of formula (1) and formula (2) above, Mg in main layer 2 Si content, Mg in the cross-section of the main layer 2 Area ratio of Si, Mg 2 Table 3 shows the strength ratio of Si to Al and the film thickness of the interface alloy layer).

[0162] (Evaluation of Coating Corrosion Resistance)

[0163] (1) Evaluation of corrosion resistance of bent...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The purpose of the present invention is to provide a molten Al-Zn-Mg-Si-plated steel sheet having favorable corrosion resistance of the flat parts and edges and also having excellent machined part corrosion resistance. To achieve said purpose, the present invention is a molten Al-Zn-Mg-Si-plated steel sheet having a plated coating on the surface of a steel sheet and is characterized in that: the plated coating is obtained from an interfacial alloy layer present at the interface with the base steel sheet and a main layer present on said alloy layer; the coating contains 25-80 mass% of Al, greater than 0.6-15 mass% of Si, and greater than 0.1-25 mass% of Mg; and the content of Mg and Si in the plated coating satisfies formula (1). MMg / (MSi-0.6)> (1) MMg: Mg content (mass%), MSi: Si content (mass%)

Description

technical field [0001] The present invention relates to a hot-dip Al-Zn-Mg-Si plated steel sheet which has good corrosion resistance of flat plate parts and end parts and is also excellent in corrosion resistance of processed parts, and a method for producing the same. Background technique [0002] The hot-dip Al-Zn-based steel sheet can combine the sacrificial corrosion resistance of Zn and the high corrosion resistance of Al, so it also exhibits high corrosion resistance in the hot-dip galvanized steel sheet. For example, Patent Document 1 discloses a hot-dipped Al—Zn-based steel sheet containing 25 to 75% by mass of Al in the plated coating. In addition, due to its excellent corrosion resistance, hot-dip Al-Zn-coated steel sheets have been in demand in recent years, mainly in the fields of building materials such as roofs and walls exposed to the outside for a long time, and in civil engineering fields such as guardrails, wiring and piping, and soundproof walls. growing....

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/12C22C18/04C22C21/10C22C30/06C23C2/28
CPCC23C2/12C23C2/28C22C18/04C22C21/10C22C30/06C23C28/023C23C2/29C23C2/26C23C2/40C23C2/06
Inventor 大居利彦佐藤洋平飞山洋一大熊俊之古田彰彦吉田昌浩铃木善继安藤聪松崎晃
Owner JFE GALVANIZING & COATING CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com