CN101980403A - Pseudo alloy anticorrosion coating for grounding net of power system - Google Patents
Pseudo alloy anticorrosion coating for grounding net of power system Download PDFInfo
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- CN101980403A CN101980403A CN2010105550601A CN201010555060A CN101980403A CN 101980403 A CN101980403 A CN 101980403A CN 2010105550601 A CN2010105550601 A CN 2010105550601A CN 201010555060 A CN201010555060 A CN 201010555060A CN 101980403 A CN101980403 A CN 101980403A
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Abstract
The invention discloses a pseudo alloy anticorrosion coating for the grounding net of a power system, which consists of zinc, aluminum and copper non-ferrous metal materials, wherein the aluminum accounts for 12 to 30 percent of the total weight of the coating, copper 6 to 15 percent and zinc the balance. The zinc-aluminum-copper pseudo alloy coating can be combined into a whole at high temperature and high speed, and can meet the requirements of the grounding net on corrosion resistance, conductivity and thermal stability. The process of the coating, the price of the coating is cheap and the cost of the grounding net of the power system is low. Compared with the prior art, the coating has higher corrosion resistance and conductivity.
Description
Technical field
The present invention relates to a kind of pseudo-alloy coat, be specially adapted to the pseudo-alloy coat of electric power system ground network (body).
Background technology
The method that improves the ground network corrosion resistance at present mainly contains at the steel plating zinc on surface, adopts fine copper and copper covered steel to make earthing material.But these all respectively have its weak point, and are as follows:
The deficiency of steel plating zinc on surface is that the passivation effect of zinc in soil is relatively poor; its anticorrosion mechanism mainly is sacrificial anode (zinc) protection steel; but because the thickness of zinc coat is limited; generally imbedding underground 1-2 zinc coat just is corroded; heavy corrosion appears in the zinc-plated earthing material of operation 5-10, even rust is disconnected.Fine copper is good grounding material, and its conducting and diffusing stream ability are strong, and anti-soil corrosion performance is good, can guarantee the ground network reliability service 25～30 years.But copper imbedding in a large number in soil can be caused heavy metal pollution, in China soil environment quality standard GB15618-1995, be limited to use (content of copper ion should be lower than 400mg/kg in the regulation soil), and the price height of copper, its ground network cost are 5～6 times of galvanized steel.Copper covered steel has good earth-continuity and corrosion resistance as earthing material, and cost is cheap approximately 20% than fine copper, but total cost is still higher, and still has the problem of contaminated soil.The patent No. is that 200910016099.3 Chinese patent discloses a kind of aluminum-copper pseudo alloy anticorrosion coating for grounding network, this coating is formed through electric arc spraying by copper-clad aluminium wire and aluminium wire, coating is made up of aluminium and two kinds of elements of copper, in conjunction with the corrosion resistance of copper good electrical conductivity and aluminium, satisfy the ground network instructions for use.Although the passivation protection better performances of aluminium has improved corrosion resistance to a certain extent, because the potential difference of copper and aluminium is big, the tendency of coating generation unsymmetrical corrosion is still bigger.
Summary of the invention
The pseudo-alloy coat of the zinc-aluminium copper that the object of the present invention is to provide a kind of anticorrosion lower-cost electric power system ground network that conducts electricity very well to use.
Technical scheme of the present invention is:
The pseudo-alloy corrosionproof coating of electric power system ground network, it is made up of zinc, aluminium and three kinds of nonferrous materialss of copper, and each component accounts for total weight percent and is: aluminium 12%-30%, copper 6%-15%, surplus are zinc.
Electric power system ground network with the preparation method of pseudo-alloy corrosionproof coating is: at first carbon steel is carried out sandblasting pretreatment, be mainly used to cleaning and coarse surface, then zinc silk and copper-clad aluminium wire are adopted electric arc spraying equipment, steel surface is sprayed, zinc silk and copper-clad aluminium wire are as the two poles of the earth of electric arc, evenly send to through wire feeder, after the striking, electric arc melts the silk material, compressed air atomizes molten metal after Laval nozzle quickens, and the molten drop of atomizing accelerated to supersonic speed, spray to workpiece and form coating.
Described spray voltage is 25～35V, and electric current is 150～300A.
The corrosion product of zinc in soil has excellent conducting performance, and the electrode potential of zinc and aluminium is all lower, has the effect of anode loss protection steel.Aluminium easy oxidation in soil generates the alundum (Al oxide-film, and oxide-film has good corrosion resistance.Copper has good electrical conductivity and anti-soil corrosivity in soil, reason is that copper generates copper in soil hydrous oxide and sulfate has conductivity preferably, has slower growth rate simultaneously, and matrix is had protective effect.The adding of a little copper element has increased the conductivity of coating, and can satisfy among the GB15618-1995 requirement to copper content.The pseudo-alloy corrosionproof coating of zinc-aluminium copper of the present invention utilizes the synergy of decay resistance of conductivity, the zinc-aluminium of copper, guarantees the electric power system reliable ground, and reduces the pollution of copper to soil significantly.Adopt the aluminum-copper pseudo alloy coating of the method acquisition of electric arc spraying to have good thermal stability.
The pseudo-alloy coat of zinc-aluminium copper of the present invention at high temperature, at a high speed under with matrix bond be one, can satisfy that ground network is corrosion-resistant, the requirement of conduction and thermal stability, technology is simple, low price has reduced the cost of electric power system ground network.The material corrosion resistance and the conductivity of the pseudo-alloy coat of spray zinc-aluminium copper all are better than galvanized steel.Compare with patent 200910016099.3,, reduced to take place the tendency of unsymmetrical corrosion, have better corrosion resistance because the difference in Electrode Potential between the pseudo-alloy compositions has been dwindled in the adding of zinc element.
Embodiment
Provide embodiments of the invention and preparation method and effect below.
Embodiment 1
The pseudo-alloy corrosionproof coating of electric power system ground network: Cu 12.4%, and Al 21.3%, and surplus is Zn (percentage by weight).
Preparation technology: the component proportioning according to the embodiment design, Φ 2 copper-clad aluminium wires are cooperated with Φ 2 zinc silks, adopt TLAS-III type high-performance electric arc spraying equipment to spray.Φ 2 copper-clad aluminium wires and Φ 2 zinc silks are evenly sent a material to as the two poles of the earth of electric arc spraying, after the striking, the silk material of evenly sending to melts under arcing, compressed air atomizes molten metal after Laval nozzle quickens, and the molten drop of atomizing accelerated to supersonic speed, spraying to and forming thickness through the carbon steel of blasting treatment is 100 μ m～300 μ m coatings.
Adopt above-mentioned preparation method, prepare Cu 12.4%, Al 21.3%, and surplus is the miniature ground network of the pseudo-alloy coat of zinc-aluminium copper of Zn (percentage by weight).Incorporate the miniature ground network of spray zinc aluminum-copper pseudo alloy into certain grounding net of transformer substation with zinc-plated miniature ground network, carry out earth-continuity and corrosion resistance performance relatively.Through the test of burying underground in 1 year, little net dug out observe little net surface, find zinc-plated little net seriously corroded, zinc coat has large tracts of land to come off, the corrosion product layering, outer corrosion product is brownish red, loose, the iron rust that very easily peels off; The densification of the little net corrosion product of the pseudo-alloy coat of zinc-aluminium copper, no brownish red corrosion product, corrosion resistance is significantly better than zinc-plated little net.Earth-continuity to two ground networks during burying underground carries out periodic measurement.The little net earth resistance of the pseudo-alloy coat of spray zinc-aluminium copper is lower than the earth resistance of zinc-plated little net all the time, and resistance is stable.When the time of burying underground is 238 days, the earth resistance of zinc-plated little net is 40.8 Ω, and the earth resistance of the little net of the pseudo-alloy coat of zinc-aluminium copper is 26.7 Ω, when the time of burying underground is 351 days, the earth resistance of zinc-plated little net is 39.4 Ω, and the earth resistance of the little net of the pseudo-alloy coat of zinc-aluminium copper is 27.9 Ω.
Embodiment 2
The pseudo-alloy corrosionproof coating of electric power system ground network: Cu 6.8%, and Al 11.7%, and surplus is Zn (percentage by weight).
Preparation technology: the component proportioning according to the embodiment design, Φ 2 copper-clad aluminium wires are cooperated with Φ 3 zinc silks, adopt TLAS-III type high-performance electric arc spraying equipment to spray.Φ 2 copper-clad aluminium wires and Φ 3 zinc silks are evenly sent a material to as the two poles of the earth of electric arc spraying, after the striking, the silk material of evenly sending to melts under arcing, compressed air atomizes molten metal after Laval nozzle quickens, and the molten drop of atomizing accelerated to supersonic speed, spraying to and forming thickness through the carbon steel of blasting treatment is 100 μ m～300 μ m coatings.
Adopt above-mentioned preparation method, prepare Cu6.8%, Al11.7%, surplus is the miniature ground network of the pseudo-alloy coat of zinc-aluminium copper of Zn (percentage by weight).Incorporate the miniature ground network of spray zinc aluminum-copper pseudo alloy into certain grounding net of transformer substation with zinc-plated miniature ground network, carry out earth-continuity and corrosion resistance performance relatively.Through the test of burying underground in 1 year, little net dug out observes little net surface, find zinc-plated little net seriously corroded, zinc coat has large tracts of land to come off, the corrosion product layering, outer corrosion product be brownish red, loose, very easily peel off iron rust; There is slight corrosion the little net of the pseudo-alloy coat of zinc-aluminium copper part, and corrosion resistance is significantly better than zinc-plated little net.Earth-continuity to two ground networks during burying underground carries out periodic measurement.The little net earth resistance of the pseudo-alloy coat of spray zinc-aluminium copper is lower than the earth resistance of zinc-plated little net all the time, and resistance is stable.When the time of burying underground is 238 days, the earth resistance of zinc-plated little net is 40.8 Ω, and the earth resistance of the little net of the pseudo-alloy coat of zinc-aluminium copper is 32.2 Ω, when the time of burying underground is 351 days, the earth resistance of zinc-plated little net is 39.4 Ω, and the earth resistance of the little net of the pseudo-alloy coat of zinc-aluminium copper is 31.9 Ω.
Claims (3)
1. the pseudo-alloy corrosionproof coating of electric power system ground network is characterized in that, it is made up of zinc, aluminium and three kinds of nonferrous materialss of copper, and each component accounts for total weight percent and is: aluminium 12%-30%, copper 6%-15%, surplus are zinc.
2. according to the preparation method of the described electric power system ground network of claim 1 with pseudo-alloy corrosionproof coating, it is characterized in that, at first carbon steel is carried out sandblasting pretreatment, then zinc silk and copper-clad aluminium wire are adopted electric arc spraying equipment, steel surface is sprayed, zinc silk and copper-clad aluminium wire are as the two poles of the earth of electric arc, evenly send to through wire feeder, after the striking, electric arc melts the silk material, compressed air atomizes molten metal after Laval nozzle quickens, and the molten drop of atomizing is accelerated to supersonic speed, sprays to workpiece and forms coating.
3. according to the preparation method of the described electric power system ground network of claim 2 with pseudo-alloy corrosionproof coating, it is characterized in that described spray voltage is 25～35V, electric current is 150～300A.
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| CN2010105550601A CN101980403A (en) | 2010-11-23 | 2010-11-23 | Pseudo alloy anticorrosion coating for grounding net of power system |
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| CN2010105550601A CN101980403A (en) | 2010-11-23 | 2010-11-23 | Pseudo alloy anticorrosion coating for grounding net of power system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104831225A (en) * | 2015-03-30 | 2015-08-12 | 国家电网公司 | Corrosion prevention method of rare earth-containing alloy coating used for ground net protection |
| CN108123232A (en) * | 2016-11-29 | 2018-06-05 | 国网河南省电力公司安阳供电公司 | It is a kind of that there is conductive anticorrosive grounding body and preparation method thereof |
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| CN101593878A (en) * | 2009-07-07 | 2009-12-02 | 山东电力研究院 | Aluminum-copper pseudo alloy anticorrosion coating for grounding network and spraying method thereof |
| CN101760678A (en) * | 2008-12-18 | 2010-06-30 | 长葛市联发粮食专业合作社 | Corrosion-resistance zinc-aluminum based alloy |
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| CN101760678A (en) * | 2008-12-18 | 2010-06-30 | 长葛市联发粮食专业合作社 | Corrosion-resistance zinc-aluminum based alloy |
| CN101593878A (en) * | 2009-07-07 | 2009-12-02 | 山东电力研究院 | Aluminum-copper pseudo alloy anticorrosion coating for grounding network and spraying method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104831225A (en) * | 2015-03-30 | 2015-08-12 | 国家电网公司 | Corrosion prevention method of rare earth-containing alloy coating used for ground net protection |
| CN104831225B (en) * | 2015-03-30 | 2017-06-09 | 国家电网公司 | A kind of method of coating antiseptic containing rare earth alloy for grounded screen protection |
| CN108123232A (en) * | 2016-11-29 | 2018-06-05 | 国网河南省电力公司安阳供电公司 | It is a kind of that there is conductive anticorrosive grounding body and preparation method thereof |
| CN108123232B (en) * | 2016-11-29 | 2020-04-21 | 国网河南省电力公司安阳供电公司 | Grounding body with conductive and corrosion-resistant functions and preparation method thereof |
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Application publication date: 20110223 |