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Thermal spraying rare earth alloy coated rebar

A rare earth alloy, thermal spraying technology, applied in coatings, metal material coating technology, anti-corrosion coatings, etc., can solve the problems of increased anchorage length of steel bars, decreased bonding strength, anti-exposure aging, etc., and achieves the optimization of metal alloy performance, The effect of improving the surface state and refining the alloy grains

Active Publication Date: 2020-04-17
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, insufficient anti-corrosion durability, and difficulty in repairing cuts and damages on site. It also solves the technical problems of corrosion resistance and aging resistance of epoxy-coated steel bars (including epoxy galvanized steel bars) and zinc-aluminum coated steel bars.

Method used

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  • Thermal spraying rare earth alloy coated rebar
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  • Thermal spraying rare earth alloy coated rebar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1- Embodiment 3

[0039] The rare earth alloy wire was prepared, and its composition by weight percentage is shown in Table 1.

[0040] Si, Cu, Zr, Mg, V, Li, Ti, B, Bi, Mn, rare earth metals, etc. contained in the components, and 20% to 30% of Zn are melted in a hollow induction furnace to form a master alloy. spare;

[0041] Then put Al and the remaining Zn into the melting furnace for melting, the melting temperature is 750±10°C, after Al and Zn are completely melted, refine, then add the master alloy prepared above, fully stir until the melting is clear, and let it stand for 0.5~ After 2 hours, remove the slag and cast it into bars;

[0042] Put the bar into an electric furnace at 400±20°C for heat treatment for 3-6 hours, and obtain a rough alloy billet with a diameter of 4-8mm through horizontal continuous casting; after annealing the rough billet in a vacuum annealing furnace at 200±20°C for 1-2 hours, use The wire drawing machine is made into 2mm or 3mm diameter special wire for therm...

Embodiment 4- Embodiment 5

[0048] Water-based two-component polyurethane primer sealer preparation, its components by weight percentage are shown in Table 2

[0049] The preparation method of the main agent part: add alcohol ether solvents, wetting and dispersing agents, wetting agents, leveling agents, anti-sedimentation agents, adhesion promoters, antioxidants, and ultraviolet light absorbers to deionized In water, stir and disperse until the fineness is below 30 μm, then add hydroxyl-containing polyacrylate dispersion, water-based elastic polyurethane dispersion, scaly zinc powder or aluminum powder, defoamer, thickener, and anti-sagging additives to stir and disperse After 30 minutes, it will be packaged.

[0050] The curing agent part includes the following raw materials: 60-80% water-dispersed polyisocyanate, 20-40% high-boiling point ether ester solvent, the two are mixed and dispersed according to the weight percentage in Table 2, and then discharged and packaged.

[0051] Examples 4-Example 5 ...

Embodiment 6

[0056] See figure 1 and figure 2 shown;

[0057] The preparation method of the thermal sprayed rare earth alloy clad steel bar is as follows: The preparation method of the thermal sprayed rare earth alloy clad steel bar is as follows: the steel bar assembly line adopts figure 1 Arranged in the manner shown, the thermal spraying spray gun 1 is arranged around the longitudinal cross-section of the steel bar 2 assembly line, in a "ten"-shaped structure.

[0058] Step 1: Mechanical derusting Derusting by shot blasting machine to remove dust, impurities, scale and rust on the surface of the steel bar. The surface cleanliness of the steel bar base material can reach Sa3 level, and the surface roughness can reach Rz60-100μm;

[0059] Step 2: Immediately after thermal spraying mechanical rust removal, use an arc spray gun to spray the rare earth alloy wire material prepared in Example 1 on the surface of the qualified steel matrix 2 that has been derusted, adjust the walking speed ...

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Abstract

The invention discloses a thermal spraying rare earth alloy coated rebar. A thermal spraying mode is adopted, through the steps of mechanical derusting, thermal spraying, post-processing and the like,a rare earth alloy wire is sprayed onto the surface of a rebar substrate to prepare the thermal spraying rare earth alloy coated rebar, the rare earth alloy wire is mainly composed of Zn and Al and evenly added with Si, Li, Cu, Zr, V, Ti, B, Mn, rare earth metals and the like, and the hardness, plasticity and toughness of alloy and a coating as well as the shielding performance and cathode protection performance of a metal thermal spraying coating are improved; a two-component water-based polyurethane sealing agent and finish paint are adopted for processing, and the surface of the rebar canbe compatible with and adhere to concrete more easily; and the production effect is improved by adopting production lines of a structure in a cross shape, in a shape like the symbol '*', in a shape like the Chinese character 'mi' and the like. According to the thermal spraying rare earth alloy coated rebar, the common technical problems that at present, the relative adhesion strength between epoxycoated rebars and concrete as well as between zinc-aluminum coated rebars and concrete is substantially reduced, the anchorage length of the rebars is increased by 25%, the corrosion resistance and the durability are poor, and notches and damaged positions are difficult to repair on site are solved, and the good application prospect is achieved.

Description

technical field [0001] The invention relates to coated steel bar technology, in particular to a thermal sprayed rare earth alloy coated steel bar, which belongs to the technical field of construction steel application and protection. 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 progress in adopting this tech...

Claims

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Application Information

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IPC IPC(8): C23C4/12C23C4/06C23C4/02C23C4/18C22C18/04C22C30/06C22C30/02C09D175/04C09D5/10C09D5/24C09D7/48
CPCC08K2003/0812C08K2003/0893C08L2205/025C09D5/002C09D5/103C09D5/106C09D5/24C09D175/04C22C18/04C22C30/02C22C30/06C23C4/02C23C4/06C23C4/12C23C4/18C09D7/48C08L75/04C08K7/00C08K3/08
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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