CN101906604B - Rare earth aluminum alloy wire for thermal spraying - Google Patents

Abstract

The invention discloses a rare earth aluminum alloy wire for thermal spraying, which belongs to the technical field of thermal spraying. The wire contains aluminum, zinc, magnesium and the like, and also contains two or more than two rare earth metal elements, and the total weight of rare earth metal elements accounts for 0.51-5.00% of the total weight of the wire. The invention has the advantages that the processing and manufacturing process is convenient and the product coat cost is moderate; and the metal thermal spraying coating made from the wire has good adhering capability, good physical and mechanical property, good corrosion-resistant property, and moderate construction cost, and is favorable for popularization and application.

Description

Rare earth aluminum alloy wire for thermal spraying

Technical field

The present invention relates to the used for hot spraying metal wire in Surface Engineering corrosion prevention field, be specifically related to a kind of rare earth aluminum alloy wire for thermal spraying, belong to technical field of hot.

Background technology

Metallic corrosion has become the maximum harm of large-scale steel structure building, has a strong impact on it and uses safety and life-span.U.S.'s Speedway Control Broad 1998 statistics, 279543 on its domestic interstate and national bridge, 68466 on the bridge that needs repairing because of corrosion, corrosion rate 24.5%; The annual metal because of corrosive wear in the whole world reaches 2.3 hundred million tons, accounts for 30% of output of steel then; The 7th corrosion loss investigation of U.S. 2002 issue show, the annual directly etching of the U.S. loses 2,760 hundred million dollars between 1999～calendar year 2001, accounts for 3.1% of GDP; China then reaches 4%, and the indirect loss of being brought by corrosion more is difficult to estimation, and the efficient corrosion resisting technology can make corrosion loss reduce 25%～40%.

At present, both at home and abroad the large-scale steel structure anticorrosion technique mainly contains two kinds: a kind of is the heavy duty system coating system, i.e. the triple coat composed heavy-duty coating system of inorganic or epoxy zinc rich primer+epoxy intermediate coat+polyurethane finish; Another kind is thermospray metal composite coating system, i.e. the compound coating system of electric arc spraying zinc, aluminium or aluminium zinc+seal coat+finish paint.The popularization and application on colliery, port and pier, large-sized civil steel building, bridge, high-speed railway, large ship and other large industrialized projects (such as petrochemical industry, electric power, ocean) of thermospray metallic coating and Coating Technique Used thereof has obtained excellent society and economic benefit.

China is the abundantest country of rare earth resources in the world, rare earth element is of many uses, can significantly improve the physical and mechanical property of alloy in metal field, have and fill up the alloy phase defective in the good alloy, reduce the surface tension on the new and old two-phase interface, also between crystal grain and aluminium alloy, form surface-active film when accelerating nucleus growth speed, stop the grain growth that generates, make the alloy structure refinement.Rare earth element in aluminium alloy can with oxygen, sulphur simultaneous reactions, reduce its hazardness; Rare earth can adsorb and dissolved hydrogen in a large number, greatly reduces hydrogen content and the pin hole rate of aluminium.

The extensive concern that research and the application of rare earth metal in the corrosion prevention field obtained many enterprises and universities and colleges.Such as Chinese patent CN1718836A, the cerium (Ce) that accounts for a material gross weight 0.05-0.3% is joined in Mg, the Al metal, make a kind of anticorrosive wire material sprayed with rare-earth aluminum-magnesium alloy, be used for the especially long-effective corrosion of hydro project gate of steel construction, obtained positive protection effect, but what it adopted is to add Rare Earth Elements Determination cerium (Ce), and content is on the low side in addition, has affected the further raising of silk material barrier propterty; Armored force engineering institute is with the homemade powder cored filament material that contains Zn, Al, Mg and cerium (Ce) mixed powder for alloy, made the High Speed Electric Arc Spraying metallic coating, result of study shows that coating structure is fine and close, is combined well with matrix, and coating system can effectively stop the carrying out of corrosion reaction; Armored force engineering institute has also prepared alloy wire and the arc spraying coating thereof of Al-Re, Al-Mg-Re, Al-Si-Re, by salt fog and the test of chemical mediator soak at room temperature, proves that the barrier propterty of rare earth metal coating is significantly improved.But what prior art adopted is to add Rare Earth Elements Determination cerium (Ce), and wire rod is core, and its ree content is also obviously higher in addition, and product manufacturing and construction application cost are too expensive, are unfavorable for applying.

Summary of the invention

The purpose of this invention is to provide a kind of aluminum-alloy wire material that contains two kinds and two or more thuliums, this kind silk material process for machining and manufacturing is simple and direct, product cost is moderate, the metal thermal spraying coating that adopts this kind silk material to make, have excellent sticking power, good physical mechanical property and solidity to corrosion, its construction cost appropriateness is conducive to apply.The technical problems such as the manufacturing cost that has solved present rare earth wire rod existence is expensive, barrier propterty is not enough, the construction application cost is high, be difficult to apply.

The present invention is achieved by the following technical solutions: a kind of rare earth aluminum alloy wire for thermal spraying, comprise aluminium, zinc, magnesium metallic element in its composition, the thulium that contains two or more in the wire composition, thulium content are the 0.51-5.00% of rare earth aluminum alloy wire gross weight; Described thulium is lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium and the yttrium in the lanthanon; The mutual consumption of described two kinds and two or more thulium is for making a gesture of measuring arbitrarily.

Described thulium is preferably: lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, erbium, ytterbium and yttrium.

The content of silk contained two kinds and two or more thuliums in the material is preferably a 0.51-2.50% of material gross weight.

The content of silk contained two kinds and two or more thuliums in the material is the 0.51-1.00% of silk material gross weight more preferably.

Rare earth aluminum alloy wire of the present invention can adopt the manufacturing of existing silk material processing and fabricating method to form, and silk material cross section is circular, and diameter specifications can be that 1.0mm, 1.6mm, 2.0mm, 3.0mm do not wait to 4mm.Its concrete manufacturing process can join smelting in the smelting furnace, refining, pour into base together with after the raw material weighing such as the rare earth metal in determining to fill a prescription and aluminium, magnesium, zinc metal, again by drawing wire machine through repeatedly being drawn into silk; Can also be first aluminium, magnesium, the zinc metal of part in thulium and the prescription be smelted into master alloy first in smelting furnace, and then with remaining aluminium, magnesium, the smelting of zinc metal, refining, pour into base, again by drawing wire machine through repeatedly being drawn into silk.The interpolation of rare earth element can be according to the content requirement of silk material middle-weight rare earths metal, in melting or smelting procedure, add respectively the single rare earth metallic substance (such as lanthanum, cerium, neodymium etc.) of corresponding weight part, also can directly add as required norium material (such as norium, few neodymium rare earth metal etc.).Consider in addition the loss of processing rare earth elements, can in prescription, increase in right amount the addition (such as the 2-10% of increasing on the basis of used rare-earth metal material total amount) of rare-earth metal material more during Practical manufacturing.

The adding of rare earth element, fill up the alloy phase defective of existing silk material, reduced the surface tension on the new and old two-phase interface, also between crystal grain and aluminium alloy, formed surface-active film when accelerating nucleus growth speed, stop the grain growth that generates, make the alloy structure refinement.Research trial shows, rare earth can improve the antioxidant property of thermal spraying material, and formation speed that can the inhibited oxidation film strengthens the antistripping ability of oxide film.

In addition rare earth element in aluminium alloy can with oxygen, sulphur simultaneous reactions, generate Re ₂O ₂S type sulfide, also with chemical combination such as low melting point metal P, Sn, As, the floating slagging, small particle becomes the heterogeneous nucleus of crystalline aluminophosphate process and stays in the solid metal, reduces its hazardness; Rare earth can adsorb and dissolved hydrogen in a large number, and the melting point compound of its formation is high, and disperse is distributed in the aluminium liquid, can not be gathered into bubble with the hydrogen of compound formation, greatly reduces hydrogen content and the pin hole rate of aluminium alloy.

Aluminium alloy interior metal crystalline structure has been optimized in the adding of two kinds and two or more thuliums, when improving the alloy structure corrosion resisting property, has also greatly improved the physical and mechanical properties of alloy, guarantees processing and fabricating and the construction application of silk material.

This rare earth aluminium alloy hot coating has excellent sticking power, good physical mechanical property and corrosion resisting property, and by experimental test, its average year erosion rate is significantly smaller than the coatings such as thermospray zinc, aluminium zinc, zinc aluminium false alloy; Its galvanic protection effect also has clear improvement than aluminium, other aluminum alloy heat metallize layers; Whole silk material process for machining and manufacturing is simple and direct, cost is lower, construction application cost appropriateness.

The invention has the beneficial effects as follows: process for machining and manufacturing is simple and direct, and product cost is moderate, and the metal thermal spraying coating that adopts this kind silk material to make has excellent sticking power, good physical mechanical property and solidity to corrosion, and its construction cost appropriateness is conducive to apply.

Embodiment

The present invention is further illustrated below in conjunction with embodiment.

The prescription of embodiment sees Table 1.

Press each raw metal of table 1 by the proportioning weighing, join successively in the smelting furnace and smelt together, after refining, cast, become base, again by drawing wire machine through repeatedly being drawn into silk, a silk material diameter is 3mm.

Adopt existing arc pistol and spraying equipment, reach on the surface of steel plate that requires more than the Sa3 level through sandblasting on the surface, by existing electric arc spraying process spraying rare earth aluminium alloy coating, and it is carried out sticking power, porosity and anti-neutral salt spray is measured, detected result shows: coating adhesion (drawing) greater than 20MPa, coating porosity less than 2%, the 3000h salt-fog test is without rusty stain.

Table 1 rare earth aluminum alloy wire proportioning units/kg

Claims (2)

1. a rare earth aluminum alloy wire for thermal spraying is characterized in that comprising aluminium, zinc, thulium in the material moiety, and each moiety is as follows: aluminium 85kg, zinc 10kg, magnesium 2kg, lanthanum-rich rare-earth metal 3kg, wherein:

The purity of aluminium＞99.9%, the purity of zinc＞99.99%, the purity of magnesium＞99%, lanthanum-rich rare-earth metal are the mishmetals that contains 70% lanthanum and 25% cerium;

Above-mentioned each composition joined in the smelting furnace together successively smelts, after refining, cast, become base, again by drawing wire machine through repeatedly being drawn into silk, a silk material diameter is 3mm;

Adopt existing arc pistol and spraying equipment, reach on the surface of steel plate that requires more than the Sa3 level through sandblasting on the surface, by existing electric arc spraying process spraying rare earth aluminium alloy coating, and it is carried out sticking power, porosity and anti-neutral salt spray is measured, detected result shows: the coating adhesion drawing greater than 20MPa, coating porosity less than 2%, the 3000h salt-fog test is without rusty stain.

2. rare earth aluminum alloy wire for thermal spraying is characterized in that moiety is as follows: aluminium 85kg, zinc 10kg, No. two 5kg of norium, wherein:

The purity of aluminium＞99.9%, the purity of zinc＞99.99%, norium are for No. two the mishmetals that contains lanthanum 28%, cerium 50%, praseodymium 4%, neodymium 15%;

Above-mentioned each composition joined in the smelting furnace together successively smelts, after refining, cast, become base, again by drawing wire machine through repeatedly being drawn into silk, a silk material diameter is 3mm;

Adopt existing arc pistol and spraying equipment, reach on the surface of steel plate that requires more than the Sa3 level through sandblasting on the surface, by existing electric arc spraying process spraying rare earth aluminium alloy coating, and it is carried out sticking power, porosity and anti-neutral salt spray is measured, detected result shows: the coating adhesion drawing greater than 20MPa, coating porosity less than 2%, the 3000h salt-fog test is without rusty stain.