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A kind of Znalmgsib anticorrosion coating for steel structure and preparation method thereof

A technology of anti-corrosion coating and steel structure, applied in the direction of coating, metal material coating process, melt spraying, etc., can solve the problem of low bonding strength of coating and steel structure substrate, high cost of anti-corrosion coating raw materials, and unsuitable promotion. Use and other problems to achieve the effect of reducing coating consumption, strengthening cathodic protection, and improving density

Active Publication Date: 2021-02-26
SINOADDITIVE MFG EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of rare earth elements leads to high cost of raw materials for anti-corrosion coatings, and the coatings still have high porosity, and the bonding strength between the coatings and the steel structure matrix is ​​low. During transportation and engineering construction, the coatings are easy to peel off and damage. suitable for promotion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A ZnAlMgSiB anti-corrosion coating for steel structures in this embodiment is composed of the following components in mass percentage: Zn 78%, Al 15%, Mg 2%, Si 3%, B 2%.

[0022] The preparation method of ZnAlMgSiB anticorrosion coating for steel structure of this embodiment comprises the following steps:

[0023] Step 1. Pretreat the surface of the steel structure to Sa2.5 by high-pressure water blasting;

[0024] Step 2, heating the ZnAlMgSiB wire to a molten state by means of an arc spraying method, and spraying it onto the steel structure surface after the pretreatment in step 1 under the action of compressed air to form a ZnAlMgSiB anti-corrosion coating; the spray gun used in the arc spraying method and The distance on the surface of the steel structure is 280mm, the spraying angle of the spray gun is 60°, the arc voltage is 40V, the arc current is 600A, the conveying speed of the ZnAlMgSiB wire material is 5m / min, and the pressure of the compressed air is 0.9MPa...

Embodiment 2

[0028] A ZnAlMgSiB anti-corrosion coating for steel structures in this embodiment is composed of the following components in mass percentage: 2.8% Zn, 55% Al, 0.5% Mg, 0.7% Si, and 1% B.

[0029] The preparation method of ZnAlMgSiB anticorrosion coating for steel structure of this embodiment comprises the following steps:

[0030] Step 1. Pretreat the surface of the steel structure to Sa2.5 by sandblasting;

[0031] Step 2: Heat the ZnAlMgSiB powder core wire material composed of ZnAl wire-coated AlMgSiB powder to a molten state by using the arc spraying method, and spray it on the surface of the steel structure after the pretreatment in step 1 under the action of compressed air to form a ZnAlMgSiB anti-corrosion coating The spray gun that described arc spraying method adopts and the distance of steel structure surface are 100mm, and the spraying angle of spray gun is 90 °, and arc voltage is 20V, and arc current is 200A, and the delivery speed of described ZnAlMgSiB powder co...

Embodiment 3

[0035] A ZnAlMgSiB anti-corrosion coating for steel structures in this embodiment is composed of the following components in mass percent: Zn 55%, Al 40.4%, Mg 1.2%, Si 1.9%, B 1.5%.

[0036] The preparation method of ZnAlMgSiB anticorrosion coating for steel structure of this embodiment comprises the following steps:

[0037] Step 1. Pretreat the surface of the steel structure to Sa2.5 by high-pressure water blasting;

[0038] Step 2: Heat the ZnAlMgSiB powder core wire material composed of Zn wire and Al wire coated MgSiB powder to a molten state by arc spraying method, and spray it on the surface of the steel structure after the pretreatment in step 1 under the action of compressed air to form ZnAlMgSiB Anti-corrosion coating; The distance between the spray gun and steel structure surface that described arc spraying method adopts is 100mm, and the spraying angle of spray gun is 75 °, and arc voltage is 30V, and arc current is 400A, and the delivery speed of described ZnAlMgSi...

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Abstract

The invention discloses a ZnAlMgSiB corrosion-resistance coating layer for a steel structure. The coating layer comprises the following components in percentage by mass: 42.8-78% of Zn, 15-55% of Al,0.5-2% of Mg, 0.7-3% of Si, and 1-2% of B. Corrosion products formed by Si and B in the ZnAlMgSiB corrosion-resistance coating layer are not dissolved in water, so that the corrosion rate of the coating layer is reduced, the coating layer is totally compact, and the corrosion-resistance life of the steel structure is prolonged. The invention further discloses a method for preparing the ZnAlMgSiB corrosion-resistance coating layer for the steel structure; and the method comprises the following steps: (1) the surface of the steel structure is pretreated above Sa 2.5 grade; and (2) a spraying material is sprayed too the pretreated surface of the steel structure by an arc spraying method to form a ZnAlMgSiB coating layer. The method reduces holes in the coating layer, and improves the bondingstrength between the coating layer and the steel structure.

Description

technical field [0001] The invention belongs to the technical field of steel structure anticorrosion, and in particular relates to a ZnAlMgSiB anticorrosion coating for steel structures and a preparation method thereof. Background technique [0002] Zn has the advantage of electrochemical activity, can provide effective cathodic protection for steel substrates, and has the effect of isolation and protection against corrosive media, but its corrosion products dissolve in water, resulting in a higher corrosion rate of Zn coatings and faster coating consumption. . Al coating is easy to form dense Al in the atmosphere 2 o 3 The thin film has a good passivation protection effect, and the corrosion products are insoluble in water, which greatly reduces the uniform corrosion rate. Therefore, ZnAl alloy is the most commonly used anticorrosion coating material for steel structures. [0003] The alloy coating prepared by arc spraying method avoids the pollution of hot-dip plating,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/131C23C4/06C22C21/10C22C18/04
CPCC22C18/04C22C21/10C23C4/06C23C4/131
Inventor 华云峰
Owner SINOADDITIVE MFG EQUIP CO LTD