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A kind of hot-dip plating zn-al-mg alloy layer on the surface of bridge steel wire and its preparation method

An alloy layer and hot-dip plating technology, applied in hot-dip plating process, metal material coating process, coating and other directions, can solve the problems of narrow adjustment range and limited effect, improve strength, reduce impact, corrosion resistance, etc. excellent effect

Active Publication Date: 2018-03-23
BAOSTEEL GRP NANTONG WIRE PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the composition of the zinc-aluminum alloy coating is largely affected by the wire preparation process, resulting in a narrow adjustment range. As for the zinc-aluminum pseudo-alloy coating, although its composition can be adjusted within a wide range, because it only contains Zn and Al two elements, the self-sealing effect of the corrosion products of the coating on the pores in the coating is improved compared with the pure zinc coating, but the effect is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Steel wire surface treatment

[0035] Before hot-dip plating, the surface of the steel wire is treated to remove impurities such as oil stains and oxides.

[0036] (2) Hot-dip plating treatment

[0037] By strictly controlling the hot-dip coating temperature (560°C) and hot-dip coating time of 50s, a uniform Zn-Al-Mg alloy coating is obtained on the steel wire surface.

[0038] Coating composition: Zn 85%; Al 14.5%, Mg0.5%

[0039] Coating quality: 210g / m 2

[0040] Coating performance test:

[0041] Adhesion test: 16MPa;

[0042] Self-corrosion potential (E corr )-1.10V, it can play a good role in protecting steel wire, self-corrosion current (I corr )1.0×10 -6 A·cm -2 , slow corrosion rate and good corrosion resistance.

[0043] Red rust resistance time (neutral salt spray test) > 10000 hours.

Embodiment 2

[0045] (1) Steel wire surface treatment

[0046] Before hot-dip plating, the surface of the steel wire is treated to remove impurities such as oil stains and oxides.

[0047](2) Hot-dip plating treatment

[0048] By strictly controlling the hot dipping temperature (530°C) and hot dipping time of 50s, a uniform Zn-Al-Mg alloy coating is obtained on the surface of the steel wire.

[0049] Coating composition: Zn 75%; Al 22.8%, Mg 2.2%

[0050] Coating quality: 210g / m 2

[0051] Coating performance test:

[0052] Adhesion test: 15.8MPa;

[0053] Self-corrosion potential (E corr )-1.07V, which can play a good role in protecting steel wire, self-corrosion current (I corr )1.2×10 -6 A.cm -2 , slow corrosion rate and good corrosion resistance.

[0054] Red rust resistance time (neutral salt spray test) > 10000 hours.

Embodiment 3

[0056] (1) Steel wire surface treatment

[0057] Before hot-dip plating, the surface of the steel wire is treated to remove impurities such as oil stains and oxides.

[0058] (2) Hot-dip plating treatment

[0059] By strictly controlling the hot dipping temperature (560°C) and hot dipping time of 30s, a uniform Zn-Al-Mg alloy coating is obtained on the surface of the steel wire.

[0060] Coating composition: Zn 62%; Al 35%, Mg 3%

[0061] Coating quality: 210g / m 2

[0062] Coating performance test:

[0063] Adhesion test: 14.7MPa;

[0064] Red rust resistance time (neutral salt spray test) > 10000 hours.

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Abstract

The invention relates to a Zn-Al-Mg alloy layer used for being hot-dipped to a bridge steel wire surface and a manufacturing method for the Zn-Al-Mg alloy layer. The alloy layer comprises, by mass, 30%-97% of Zn, 5%-60% of Al and 0.02%-11% of Mg, wherein the sum of the percentages of all the components is 100%. The manufacturing method includes the steps that a bridge steel wire is unoiled and derusted; the alloy layer is hot-dipped; and stabilizing treatment is conducted. According to the alloy plating layer, the corrosion resistance is superior to that of an existing zinc plating layer and that of an existing zinc aluminum alloy plating layer, the alloy plating layer is easy to use, meets the requirements of the special environments, such as the requirement for bridge steel wires in the marine corrosion atmosphere environment and has wide market prospects.

Description

technical field [0001] The invention belongs to the field of steel wire coatings and preparation methods thereof, in particular to a Zn-Al-Mg alloy layer used for hot-dip coating on the surface of bridge steel wires and a preparation method thereof. Background technique [0002] With the rapid development of bridge construction technology, the span of bridge architectural design is increasing, and the application of suspension bridges with unique advantages is becoming more and more extensive. The increase in the span and the complexity of the construction environment put forward higher requirements on the strength and corrosion resistance of the main load-bearing component "main cable" of the suspension bridge. At present, the main coating of bridge steel wire is zinc layer. Through the hot-dip coating process, a uniform layer of zinc coating is hot-dip coated on the outer layer of the wire rod to protect the substrate to a certain extent. Due to the high porosity of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/06C23C2/12C23C2/38C23C2/28C22C18/04C22C21/10
CPCC22C18/04C22C21/10C23C2/06C23C2/12C23C2/28C23C2/38
Inventor 王正茂肖轶钟庆东孟昭贤周建华赵启亮张俊良
Owner BAOSTEEL GRP NANTONG WIRE PROD
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