Hot spraying rare earth aluminum alloy coating steel bar

A thermal spraying, aluminum alloy technology, applied in the direction of coating, metal material coating process, melt spraying, etc., can solve the problems of increased anchorage length of steel bars, difficult repair of damaged parts, insufficient anti-corrosion durability, etc., to achieve the performance of metal alloys Optimize, prevent intergranular corrosion, improve the effect of hardness

Active Publication Date: 2020-03-27
XUZHOU ZHONGKUANG ANFENG ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the current common technical problems of epoxy-coated steel bars and zinc-aluminum-coated steel bars, such as a substantial decrease in the relative bonding strength with concrete, a 25% increase in the anchorage length of the steel bars, insufficie

Method used

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  • Hot spraying rare earth aluminum alloy coating steel bar
  • Hot spraying rare earth aluminum alloy coating steel bar
  • Hot spraying rare earth aluminum alloy coating steel bar

Examples

Experimental program
Comparison scheme
Effect test

Example

[0040] Example 1-Example 3:

[0041] For the preparation of rare earth aluminum alloy wire, its composition in weight percentage is shown in Table 1.

[0042] Table 1. Example 1-3 rare earth aluminum alloy wire composition, performance and thermal spraying rare earth aluminum alloy coating performance data

[0043]

[0044] Smelt the Si, Mg, Li, Ti, B, Bi, Mn, rare earth metals, etc. contained in the composition with 20% to 30% Al in a hollow induction electric furnace to form an intermediate alloy for use;

[0045] Then put Zn and the remaining Al into a smelting furnace for smelting at a smelting temperature of 750±10°C. After Al and Zn are completely melted, refining is performed, and then the intermediate alloy prepared above is added, fully stirred until it is melted, and allowed to stand for 0.5~ After 2h, remove the slag and cast into bars;

[0046] Put the bar into an electric furnace at 400±20℃ for heat treatment for 3~6h, and obtain a rough alloy billet with a diameter of 4~8...

Example

[0049] Example 4-Example 5

[0050] Preparation of water-based two-component polyurethane primer sealer, and its components in weight percentage are shown in Table 2.

[0051] Table 2 Main performance test data of water-based two-component polyurethane primer sealer

[0052]

[0053] The preparation method of the main agent part: add alcohol ether solvents, wetting and dispersing agents, wetting agents, leveling agents, anti-settling agents, adhesion promoters, antioxidants, and ultraviolet light absorbers to deionization according to the weight percentage in Table 2 In water, stir and disperse until the fineness is below 30μm. Add hydroxyl-containing polyacrylate dispersion, water-based elastic polyurethane dispersion, scaly zinc powder or aluminum powder, defoamer, thickener, anti-sagging auxiliary agent, stir and disperse After 30min, it will be discharged and packaged.

[0054] The curing agent part includes the following raw materials: 60-80% water-dispersible polyisocyanate, 20...

Example Embodiment

[0056] Example 6

[0057] see figure 1 , figure 2 As shown,

[0058] The preparation method of thermal sprayed rare earth aluminum alloy coated steel bars is as follows: The preparation method of thermal sprayed rare earth aluminum alloy coated steel bars is as follows: figure 1 It is arranged in the manner shown, and the thermal spray gun 1 is arranged on the periphery of the longitudinal cross section of the pipeline of the steel bar substrate 2 in a "cross"-shaped structure.

[0059] Step 1: Mechanical derusting. Derusting by shot blasting machine to remove dust, impurities, oxide scale and rust on the surface of the steel bar. The surface cleanliness of the steel bar substrate reaches Sa3 level, and the surface roughness reaches Rz60-100μm;

[0060] Step 2: Immediately after thermal spraying mechanical descaling, use an arc spray gun to spray the rare earth aluminum alloy wire prepared in Example 1 on the surface of the steel bar substrate that has been qualified for rust removal,...

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Abstract

The invention discloses a hot spraying rare earth aluminum alloy coating steel bar. A hot spraying manner is adopted, and the hot spraying rare earth aluminum alloy coating steel bar is prepared by spraying a rare earth aluminum alloy wire to the surface of a steel bar base body through mechanical rust removal, hot spraying, after treatment and other steps, wherein Si, Li, Ti, B, Mn, rare earth metal and the like can improve hardness, plasticity, tenacity, shielding performance and cathode protection capability of an aluminum alloy and a clad layer. A double-component waterborne polyurethane sealing agent and a finishing coat are adopted for treatment, cleanliness and environment friendliness are achieved, surface drying is rapid, and compatible bonding with concrete is easier due to the surface of the hot spraying rare earth aluminum alloy coating steel bar. According to the hot spraying rare earth aluminum alloy coating steel bar, the common technical problems that according to a current epoxy coating steel bar and a zinc-aluminum clad layer steel bar, the relative bonding strength with concrete is greatly reduced, the steel bar anchoring length is increased by 25%, anti-corrosion durability is insufficient, and notch and damaged positions are hard to repair on the site are solved, and good application prospects are achieved.

Description

technical field [0001] The invention relates to coated steel bar technology, in particular to a thermal sprayed rare earth aluminum alloy coated steel bar, which belongs to the technical field of steel application and protection in construction engineering. Background technique [0002] In order to improve the service life of reinforced concrete projects in harsh corrosive environments and meet the long-life design requirements of reinforced concrete structural projects such as harbor terminals, cross-sea bridges, tunnels, and offshore oil production platforms, in 1973 the United States took the lead in researching and optimizing epoxy resin coated steel bars for use in hotels. Westphalia Bridge solved the steel bar corrosion problem and achieved good results. Subsequently, epoxy resin coated steel bar technology was widely used in the United States, Japan, Europe, and the Middle East and other countries and regions. Since the 1980s, after my country has made positive progre...

Claims

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Application Information

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IPC IPC(8): C23C4/14C23C4/06C23C4/02C23C4/131C23C4/129C23C4/18C22C21/10
CPCC23C4/02C23C4/06C23C4/14
Inventor 安云岐黄淑娟晁兵李承宇杜彬曹辉杨棕凯
Owner XUZHOU ZHONGKUANG ANFENG ENG TECH
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