Hot-dip aluminizing zinc chrome-free passivated steel-plate and technique thereof

A chromium-free passivation and passivation treatment technology, applied in metal material coating processes, chemical instruments and methods, devices for coating liquid on surfaces, etc., can solve the problem of reducing corrosion resistance and service life, easy breakdown, Poor heat resistance, etc.

Inactive Publication Date: 2008-12-31
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its advantage is that it can provide corrosion resistance comparable to traditional chromate passivation, but welding has relatively large limitations. It is only suitable for GA substrates, and welding on GL is easy to break down
In addition, since the main film-forming agent is a polymer with poor heat resistance, thermal degradation will inevitably occur when heated, reducing corrosion resistance and service life

Method used

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  • Hot-dip aluminizing zinc chrome-free passivated steel-plate and technique thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0065] The present invention (embodiment 1~3) corrosion resistance:

[0066] table 3

[0067] Salt spray test 72h

(ASTM B117)

Cyclic corrosion test 3 cycles

(SST 8h+DWELL 16h is 1 cycle)

5% black rust and slight white rust

As shown in Figure 2a

<10% black rust and white rust

As shown in Figure 2b

[0068] Weldability:

[0069] Take the product of the present invention as an example of the welding performance of the explosion-proof strip steel in the display production plant, and the measured weldability is as shown in table 4:

[0070] Table 4

[0071] user

user 1

user 2

Steel plate specification

0.8*40mm*C

0.8*40*C

Welding process and joint form

Four point projection welding

single pulse current

Six-point lap, dispersion-enhanced

Upper electrode / lower plate electrode welding torch

Double Pulse Spot Welding

Usage (e...

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Abstract

The invention provides a hot-dipped Al-Zn no-Co passivation steel plate, which is characterized in that the steel plate is provided with a film which uses fluoro acid salt and oxygen chlordimeform-hydrochloride of third and fourth subgroup elements as a main film forming agent and combines with the passivation disposal of compounds containing phosphorus. The invention also provides a passivation process used for the hot-dipped Al-Zn no-Co passivation steel plate, comprising a roll plating and solidifying process or a spraying, dry extruding and solidifying process.

Description

technical field [0001] The invention relates to metal surface treatment, in particular to a hot-dip galvanized chromium-free passivation treated steel plate and a treatment method thereof. Background technique [0002] Since the 1970s, the country has developed the first generation of spot welding type and the second generation of packaged explosion-proof strip steel, and has now developed into the third generation of heat-shrinkable explosion-proof strip steel. It prefabricates the explosion-proof strip steel into a frame shape, and then puts it on the picture tube body by heating and expanding, and then makes it tightly clamped on the glass edge after cooling. The third generation of explosion-proof strip steel puts forward higher requirements for metal plates: low carbon content, strength, such as yield strength of 260-320Mpa, or even higher, high toughness, and better welding performance. In particular, there are high demands on high heat resistance, solderability and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/04C23C22/36C23C22/73B05D5/00
Inventor 张剑萍傅延安
Owner BAOSHAN IRON & STEEL CO LTD
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