CN103343516B - A kind of aluminising freeway guardrail and preparation method - Google Patents
A kind of aluminising freeway guardrail and preparation method Download PDFInfo
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Abstract
A kind of aluminising freeway guardrail, including column, column upper end is provided with cap, and column is connected with breast board by connector, and all parts of guardrail is divided into base layer, ferroalloy parts and aluminium lamination from inside to outside.Described ferroaluminium layer thickness is 14 ~ 29 μm.A kind of method preparing above-mentioned aluminising freeway guardrail, comprises the following steps: one, by workpiece fire oil removing；Two, acid pickling and rust removing；Three, washing；Four, surface active；Five, help and ooze；Six, dry；Seven, sensing Fast Aluminizing；Eight, close；Workpiece after drying immerses immediately and is heated in the aluminum liquid that temperature is 680 ~ 700 DEG C with induction mode, and the infiltration time is 2 ~ 3min；The freeway guardrail of alitizing is obtained by above-mentioned steps.The method using the present invention, makes the surface of freeway guardrail form ferroalloy parts and the aluminium lamination of layer, can improve corrosive nature in its resistance to Industrial Area Atmospheric, ocean and rural environments, and its corrosion resistance is zinc-plated guardrail 6 ~ 10 times.
Description
Technical field
The present invention relates to field of traffic facilities, be directed to steel preservative treatment field, a kind of freeway guardrail and preparation method that can substitute galvanized steel completely.
Background technology
Highway is most important traffic infrastructure, and China's highway grew up from the eighties, and it plays important influence to the development of national economy and society.Guardrail is the safety guarantee facility that highway is important.In recent years, along with developing rapidly of domestic expressway construction, safety barrier market constantly expands.The total guardrail manufacturer about 200 in the whole nation at present, but owing to the performance of this product, technical parameter, production technology are grasped different by each manufacturer, the quality of product is very different, according to transportation Quality Supervision Bureau, the quality sampling of wave beams of highway steel guard rail plate is shown: the guardrail product that the section having is dealt with improperly owing to have employed anticorrosion process, cause it within time one or two years, guardrail just has rusty stains, not only have impact on the visual effect of highway, also substantially reduce the effective life of guardrail, too increase maintenance cost simultaneously.
Freeway guardrail belongs to the large-scale permanence facility of outdoor use, needs its weather to corrode, season corrodes, temperature in season becomes and the effect of surrounding medium, current domestic highway guardrail anti-corrosion mode: plastic-blasting, rear plastic-blasting zinc-plated, zinc-plated, aluminize.Plastic-blasting process is the technology of domestic guardrail anticorrosion original adoption, plastic-blasting layer thickness is not less than 200 μm, the shortcoming that this technology exists i.e. shows after using 1 year on guardrail, there is large-scale rusty stain phenomenon in all kinds of workpiece corners, edges and corners, after 2-3, there is large-area foaming from edge, permeates, comes off in guardrail coating, and has had a strong impact on the decorative effect of highway ornamental tape, even needs to change guardrail board；Zinc-plated and zinc-plated rear plastic-blasting also utilizes metal coating while utilizing organic coating protection; use sacrificial anode protection that steel matrix carries out cathodic protection, owing to when protective layer consumption, bending, coating destroys, surface of the work Stomatal Gas expands factors such as causing protective layer destruction and reduces the anti-corrosion life of guardrail after using 3-4；Aluminize and utilize surface aluminum layer to be greatly enhanced guardrail atmospheric corrosion resistance, but due to relatively stricter to transport and installation requirement, once coating is scratched, and steel matrix is exposed in surrounding medium, and the protective effect of aluminium coated weakens the most significantly.
Aluminising is one of effective measures of steel protection, can significantly improve iron and steel corrosion resistance in strong corrosive medium and oxide isolation, thermostability and the overall wear resistance of material.If aluminum content is more than 8% in steel, can be at the Al of its Surface Creation densification2O3Oxide-film, is allowed to have fabulous corrosion-resistant, oxidation resistance.But the highest aluminum amount will make steel become the most crisp, it is difficult to carries out cold and hot working and welding, can not withstand shocks and oscillating load.By the method for surface-coated aluminum, both can improve the aluminum content of steel workpieces surface layer, the good plasticity in heart portion and toughness can be kept again.The method forming coating aluminium lamination at steel surface is a lot, and the most only hot-dip, diffusion method and thermal spraying are the most conventional on producing.Hot-dip aluminizing is a kind of high efficient protected coating grown up after galvanizing by dipping.
Conventional thermal aluminum-plated steel hot dipping temperature is many in 700 DEG C of intervals, and this temperature range is less than the austenitizing temperature of steel, it is impossible to forms eutectic ferroalloy parts up to standard, therefore is used in room temperature or cold end corrosion environment more；If desired for high ambient conditions, then need the Diffusional aluminizing process carried out after hot-dip.The process of aluminising has solid alitizing method, Paste Aluminizing method, gas phase alitizing, dipped diffusion alitizing etc..The achievement in research of first three class alitizing is more, but yield is relatively low, and market share little (only accounting for about the 15% of aluminising product), the alitizing that can be mass is mainly based on dipped diffusion alumetizing process.
For hot-dip aluminizing equipment, the domestic resistance commonly used adds hot-dip aluminizing equipment mainly to rely on radiant heat transfer, have the disadvantage in that firing rate slow (generally less than 10 DEG C/sec), utilization rate of electrical low (below 40%), furnace temperature wayward (burner hearth the most easily go here and there temperature), hot dipping molten aluminum ferrum crucible life-span short (the most all in some months), corrosion irony easily pollute aluminum liquid etc., and these factors constrain the development of aluminizing technology and significantly in the extensive popularization and application of every profession and trade.
As far back as the eighties, just there are fast electric heating and the research of high-frequency induction heating aluminising in China, Liu Xianshu, Fast Aluminizing overview [J]. metal heat treatmet, 1980(05), Cheng Shuhong etc., high-frequency induction heating aluminising [J]. mechanic, 1987/06, test result indicate that the method quickly being heated aluminising by electric current can substantially be shortened aluminizing period, improve diffusion layer organization and properties.But these researchs are all premised on unguentum method or solid state process aluminising, and are in laboratory stage more, cannot realize industrialization, benefit so far, also counteracts that the industrial applications of Fast Aluminizing technology.
Inventor herein is taken patent of invention CN1673406A of new one-tenth early stage and is the most successfully developed the quick hot dipping alumetizing process using electric current heating, this technique has a plurality of advantages compared with conventional diffusion alumetizing process: as low in hot aluminizing temperature (about 680 DEG C), aluminising process short (2-4 minute), eliminate infiltration layer and show brittle zone, improve thermal-shock resistance and thermal fatigue promotes more than 10%, the aluminising outermost aluminium lamination of part etc. can be retained.But this technique still suffer from shortcoming: heating aluminum melting still uses resistance furnace equipment, and aluminum melting crucible uses the iron pan of liner nonmetallic materials, and Fast Aluminizing process relies on additional power source generating means.The resistance furnace efficiency of heating surface is the most relatively low, and the thermal conductivity of inner lining material iron pan is low, and when this causes producing in enormous quantities, temperature of aluminum liquid can not compensate in time and rise again, and therefore, production line maximum annual production is only 1-1.2 about ten thousand tons.Additionally, the ferroaluminium layer thickness of aluminising steel workpieces can not be effectively controlled (generally more than 30 microns, the thickest reach 75 microns), the final bending property of material, toughness, punch forming performance have been damaged by this.
The steel workpieces pickling of pretreatment technique of aluminising industry, mostly is horizontal pickling tube at present, and acid strength is big, gaseous volatilization environmental pollution is big, and workpiece pickling time is long, efficiency is low, and pickling workpiece is easily generated hydrogen embrittlement and causes the infiltration layer of final aluminising part to there is crackle.Sulfuric acid concentration disclosed in Chinese patent CN1392283A is 20% ~ 25%, pickling time 15 ~ 20 minutes.Sulfuric acid concentration 15% disclosed in patent CN1673406A and concentration of hydrochloric acid 10% mixed acid washing liquid, pickling time also needs 15 minutes.
Summary of the invention
The technical problem to be solved is to provide a kind of aluminising freeway guardrail, can improve the decay resistance of freeway guardrail, and the toughness of surface layer strengthens, and eliminates the surface brittleness district of conventional diffusion aluminized coating, improves thermal-shock resistance and thermal fatigue.
It is a further object of the present invention to provide a kind of preparation method, can effectively control the thickness of aluminized coating, it is achieved hot dipping-Diffusional aluminizing settles method at one go, shorten whole technique preparation time, improve yield further.
For solving above-mentioned technical problem, the technical solution adopted in the present invention is: a kind of aluminising freeway guardrail, and including column, column upper end is provided with cap, column is connected with breast board by connector, and all parts of guardrail is divided into base layer, ferroalloy parts and aluminium lamination from inside to outside.
Described ferroaluminium layer thickness is 14 ~ 29 μm.
Described ferroalloy parts and aluminium lamination by workpiece through acid pickling and rust removing, surface active, help to immerse after oozing and be heated to induction mode in the aluminum liquid that temperature is 680 ~ 700 DEG C, the infiltration time is to obtain after 2 ~ 3min.
Preferably, described ferroaluminium layer thickness is 14 ~ 23 μm.
Preferably, described ferroaluminium layer thickness is 15 ~ 20 μm.
Pellumina is also formed outside described aluminium lamination.
Described ferroalloy parts is the ferroalloy parts of column eutectic state, and column crystal is vertical with the surface of aluminium lamination.
A kind of method preparing above-mentioned aluminising freeway guardrail, comprises the following steps:
One, by workpiece fire oil removing；
Two, acid pickling and rust removing；
Three, washing；
Four, surface active；
Five, help and ooze；
Six, dry；
Seven, sensing Fast Aluminizing；Workpiece after drying immerses immediately and is heated in the aluminum liquid that temperature is 680 ~ 700 DEG C with induction mode, and the infiltration time is 2 ~ 3min；
Eight, close；
The freeway guardrail of alitizing is obtained by above-mentioned steps.
In step 2, the component of pickle be mass percent be the 98wt%H of 2 ~ 7%2SO4, the 36wt%HCl of 8 ~ 15%, 3 ~ 6%Na3PO4 、Surplus is water；
Acid pickling step is carried out in the pickling tube being connected with alternating current, and current value is 30-50A, and frequency is 8-10kHz, and pickling time is 2 ~ 3 min, wherein alternating-current pulse time 1 ~ 2min, direct current time 0.5 ~ 1min.
In step 4, the workpiece after flushing immerses immediately containing mass percent 1.6 ~ 2.0%Na2B4O7、1.8~2.2%NaNO2, 27 ~ 33%NaOH, surplus be the activating solution of water, soak time 27 ~ 33s.
In step 5, helping sepage is mass fraction 0.3 ~ 2%ZrF4、0.12~1.5%Na2ZrF6、0.05~0.5%ZrO2、0.05~5.0%KMnO4、6~15%AlF3The configuration concentration that adds water reaches saturated, and helping the time of oozing is 3 ~ 4min.
In step 7, induction heating power frequency 8 ~ 10kHz, power 300 ~ 500kw, current value is 500-700A.
In step 8, confining liquid component is 6 ~ 20%Na of mass percent2CO3, 10 ~ 40%NaOH, surplus be water.
Pellumina and aluminized coating i.e. ferroalloy parts outside in the present invention, the surface peening layer of aluminising workpiece is by aluminium lamination and aluminium lamination are constituted, and aluminium lamination determines the performances such as the reflection of the weather-proof, anti-corrosion of steel and light (hot)；Ferroalloy parts then determines the performances such as the thermostability of workpiece, high-temperature oxidation, wearability and machine-shaping.
Inventor find to use the superaudio induction heating method of the present invention coordinate the present invention quick pickling, activate and help cementation process after the product that obtains, aluminized coating, the i.e. thickness of ferroalloy parts is effectively controlled, through speculating, this may a part be that the kelvin effect that can be produced by the outer field current applied is caused, and another part is by quick pickling, activating solution component after improvement and the effect helping sepage component to play, such as quickly pickling is due to time shortening, also have correspondingly the thickness of acid accumulator penetration.The thickness that the product iron aluminium alloy layer of the present invention is final can control in 14 ~ 29 μm, preferably in 15 ~ 20 μm, thus improve, showing from national communication safety devices Quality Supervision and Inspection Center (traffic engineering management monitoring center of Ministry of Communications) examining report 2001-CA01-278 is reported, the tensile strength of product, yield strength and percentage elongation that the inventive method obtains all meet the requirements.Wherein tensile strength standard is >=370 ~ 550MPa, and the product of the present invention is 440 ~ 455 MPa；Yield strength standard is >=235
MPa, the product of the present invention is 340 ~ 345 MPa；Percentage elongation standard is >=26%, and the product of the present invention is 36 ~ 38%.
The method using the present invention, also has the advantage that
1, freeway guardrail is made, the i.e. surface of breast board, column, cap and other connectors forms ferroalloy parts and the aluminium lamination of layer, it is possible not only to make it ensure the physical property of steel matrix, and corrosive nature in its resistance to Industrial Area Atmospheric, ocean and rural environments can be greatly improved, its corrosion resistance is zinc-plated guardrail 6 ~ 10 times；
2, form eutectic structure ferroaluminium due to aluminum and steel matrix, can with freeway guardrail not because of transport shocks, bend, the factor such as installation destroys protective layer, and reduces its corrosion resistance；
3, the present invention processes for freeway guardrail surface anticorrosion and provides a kind of novel low-cost, high reliability, high efficiency production technology, the industrialization of steel surface aseptic technic can be promoted, increase product technology content, it is allowed to that there is efficient, the feature of energy-saving and environmental protection, strengthen the international competitiveness of China's freeway guardrail surface anticorrosion, there is obvious economic benefit and social benefit.
Material property prepared by the present invention and tissue are such as following table:
Table 1 and Fig. 1, Fig. 2 are express-way guard-rail plates and the column material property after this technique hot-dip aluminizing and microstructure.Visible, after the inventive method Rapid Thermal aluminising, aluminising diffusion layer depth is effectively controlled, and the final mechanical property of material is not affected by destroying, and has superpower sea water corrosion resistant.
Additionally, proved by experimental data, aluminized coating prepared by this technique i.e. ferroalloy parts relatively conventional diffusion aluminized coating, while eliminating surface brittleness district, improves thermal shock stability and thermal fatigue property each more than 10%.
Structure property after table 1 express-way guard-rail plates and column aluminising:
Accompanying drawing explanation
The invention will be further described with embodiment below in conjunction with the accompanying drawings:
Fig. 1 is the cross section structure schematic diagram of product of the present invention.
Fig. 2 is the A-A generalized section of Fig. 1.
Fig. 3 is 500 times of lower metallographic structure micro-structure diagrams of product of the present invention.
Fig. 4 is 500 times of lower ferroalloy parts thickness charts of product of the present invention.
In figure: base layer 1, ferroalloy parts 2, aluminium lamination 3, pellumina 4, cap 5, breast board 6, connector 7, column 8.
Detailed description of the invention
A kind of freeway guardrail, including column 8, column 8 upper end is provided with cap 5, and column 8 is connected with breast board 6 by connector 7, and all parts of guardrail is divided into base layer 1, ferroalloy parts 2 and aluminium lamination 3 from inside to outside；Column 8, cap 5, breast board 6 and connector 7 hereinafter referred to as workpiece in this example, material is carbon steel or steel alloy.
Described ferroalloy parts 2 thickness is 14 ~ 29 μm.Thus microstructure, the product of the present invention while still possessing superpower corrosion resistance, thermostability, wearability and photothermal reflectance, improves the bending property of material, eliminates the surface brittleness of Diffusional aluminizing layer, improves thermal-shock resistance and thermal fatigue.
Preferably, described aluminized coating 2 thickness is 15 ~ 28 μm.
Preferably, described aluminized coating 2 thickness is 15 ~ 24 μm.
Preferably, described aluminized coating 2 thickness is 15 ~ 20 μm.
Pellumina 4 is also formed outside described aluminium lamination 3.Thus structure, improves corrosion resistance, thermostability, wearability.
The described ferroalloy parts that ferroalloy parts 2 is column eutectic state, column crystal is vertical with the surface of aluminium lamination.The described ferroalloy parts that aluminized coating 2 is column eutectic state, column crystal is vertical with the surface of aluminium lamination.Thus microstructure, eliminates the surface brittleness district of product.
A kind of method preparing above-mentioned aluminising freeway guardrail, comprises the following steps:
One, by workpiece fire oil removing；By workpiece chemical degreasing, in the temperature range of 400 DEG C ~ 450 DEG C fire oil removal treatment 10min to surface clean oil-free.
Two, acid pickling and rust removing；Preferably, the component of pickle be mass percent be the wt98H of 2 ~ 7%2SO4, the wt36HCl of 8 ~ 15%, 3 ~ 6%Na3PO4 、Surplus is water；It is further preferred that acid pickling step is carried out in the pickling tube being connected with alternating current, current value is 30-50A, and frequency is 8-10kHz, and pickling time is 2 ~ 3 min, wherein alternating-current pulse time 1 ~ 2min, and direct current time 0.5 ~ 1min, alternating-current pulse and direct current are alternately.
Three, washing；Eliminate rust complete workpiece, with high pressure water washing 1 ~ 2 time.
Four, surface active；Workpiece after flushing immerses immediately containing mass percent 1.6 ~ 2.0%Na2B4O7、1.8~2.2%NaNO2, 27 ~ 33%NaOH, surplus be water activating solution in 27 ~ 33s.
Five, help and ooze；Helping sepage is mass fraction 0.3 ~ 2%ZrF4、0.12~1.5%Na2ZrF6、0.05~0.5%ZrO2、0.05~5.0%KMnO4、6~15%AlF3The configuration concentration that adds water reaches close to saturated, and helping the time of oozing is 3 ~ 4min.
Six, dry；The workpiece after oozing is helped to dry 3min at a temperature of 300 DEG C.
Seven, sensing Fast Aluminizing；Workpiece after drying immerses immediately and is heated in the aluminum liquid that temperature is 680 ~ 700 DEG C with induction mode, and the infiltration time is 2 ~ 3min；Preferably, the aluminum liquid in this example is fine aluminium liquid, or containing mass percent 0.7% lead, the aluminum liquid of 0.06% antimony.Wherein the corresponding temperature of fine aluminium liquid is 680 DEG C, and is 700 DEG C containing lead, the aluminum liquid corresponding temperature of antimony.
Induction heating power frequency 8 ~ 10kHz, power 300 ~ 500kw, current value is 500-700A.
Preferably, induction heating power frequency 90kHz, power 400kw, current value is 650A.
Eight, close；Confining liquid component is 6 ~ 20%Na of mass percent2CO3, 10 ~ 40%NaOH, surplus be water.For ensureing freeway guardrail layer surface light and uniformity, and remove the oxide skin that surface is a small amount of, aluminized coating carried out sealing treatment simultaneously, the freeway guardrail after sealing treatment is carried out quality testing, detect qualified after pack warehouse-in.
The freeway guardrail of alitizing is obtained by above-mentioned steps.The present invention is possible not only to ensure freeway guardrail mechanical performance, and makes it have excellent anticorrosive performance, and service life is long, can greatly reduce freeway guardrail maintenance cost.
Claims (10)
1. an aluminising freeway guardrail, including column (8), column (8) upper end is provided with cap (5), column (8) is connected with breast board (6) by connector (7), it is characterized in that: all parts of guardrail is divided into base layer (1), ferroalloy parts (2) and aluminium lamination (3) from inside to outside, and described ferroalloy parts (2) thickness is 14 ~ 29 μm；
Described ferroalloy parts (2) and aluminium lamination (3) by workpiece through acid pickling and rust removing, surface active, help to immerse after oozing and be heated to induction mode in the aluminum liquid that temperature is 680 ~ 700 DEG C, the infiltration time is to obtain after 2 ~ 3min.
A kind of aluminising freeway guardrail the most according to claim 1, is characterized in that: described ferroalloy parts (2) thickness is 15 ~ 20 μm.
A kind of aluminising freeway guardrail the most according to claim 1, is characterized in that: also form pellumina (4) outside described aluminium lamination (3).
A kind of aluminising freeway guardrail the most according to claim 1, is characterized in that: the described ferroalloy parts that ferroalloy parts (2) is column eutectic state, column crystal is vertical with the surface of aluminium lamination.
5. the method preparing aluminising freeway guardrail described in any one of claim 1-4, is characterized in that comprising the following steps:
One, by workpiece fire oil removing；
Two, acid pickling and rust removing；
Three, washing；
Four, surface active；
Five, help and ooze；
Six, dry；
Seven, sensing Fast Aluminizing；Workpiece after drying immerses immediately and is heated in the aluminum liquid that temperature is 680 ~ 700 DEG C with induction mode, and the infiltration time is 2 ~ 3min；
Eight, close；
The freeway guardrail of alitizing is obtained by above-mentioned steps.
A kind of method preparing aluminising freeway guardrail the most according to claim 5, is characterized in that: in step 2, the component of pickle be mass percent be the 98wt%H of 2 ~ 7%2SO4, the 36wt%HCl of 8 ~ 15%, 3 ~ 6%Na3PO4 、Surplus is water；
Acid pickling step is carried out in the pickling tube being connected with alternating current, and current value is 30-50A, and frequency is 8-10kHz, and pickling time is 2 ~ 3 min, wherein alternating-current pulse time 1 ~ 2min, direct current time 0.5 ~ 1min.
A kind of method preparing aluminising freeway guardrail the most according to claim 5, is characterized in that: in step 4, the workpiece after flushing immerses immediately containing mass percent 1.6 ~ 2.0%Na2B4O7、1.8~2.2%NaNO2, 27 ~ 33%NaOH, surplus be the activating solution of water, soak time 27 ~ 33s.
A kind of method preparing aluminising freeway guardrail the most according to claim 5, is characterized in that: in step 5, and helping sepage is mass fraction 0.3 ~ 2%ZrF4、0.12~1.5%Na2ZrF6、0.05~0.5%ZrO2、0.05~5.0%KMnO4、6~15%AlF3The configuration concentration that adds water reaches saturated, and helping the time of oozing is 3 ~ 4min.
A kind of method preparing aluminising freeway guardrail the most according to claim 5, is characterized in that: in step 7, induction heating power frequency 8 ~ 10kHz, power 300 ~ 500kw, and current value is 500-700A.
A kind of method preparing aluminising freeway guardrail the most according to claim 5, is characterized in that: in step 8, confining liquid component is 6 ~ 20%Na of mass percent2CO3, 10 ~ 40%NaOH, surplus be water.
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| CN104308130A (en) * | 2014-10-28 | 2015-01-28 | 湖北广兴通信科技有限公司 | Method for utilizing high-temperature baking to remove oil stain in pinholes |
| CN108179376B (en) * | 2017-12-08 | 2019-03-26 | 宜昌市文宸科技有限公司 | A kind of quickly compound alumetizing process |
| CN112775626A (en) * | 2020-12-29 | 2021-05-11 | 重庆市奉节县宏耀金属制品制造有限公司 | Preparation process of zinc steel guardrail |
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| GB892280A (en) * | 1958-04-03 | 1962-03-21 | Atomic Energy Commission | Method of forming a protective coating on steel surfaces |
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| CN1673406A (en) * | 2005-03-11 | 2005-09-28 | 广州豪然润峰实业有限公司 | Fast thermal alumetizing technology for steel pieces |
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| CN101974728A (en) * | 2010-11-10 | 2011-02-16 | 武汉苏泊尔炊具有限公司 | Aluminizing process for iron pan |
| CN103014612A (en) * | 2012-11-21 | 2013-04-03 | 中国科学院金属研究所 | Method for performing high-speed aluminizing on slurry without protective atmosphere or protective layer under atmospheric conditions |
| CN203320455U (en) * | 2013-07-08 | 2013-12-04 | 湖北交投四优钢科技有限公司 | Aluminized highway guardrail |
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2013
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| GB892280A (en) * | 1958-04-03 | 1962-03-21 | Atomic Energy Commission | Method of forming a protective coating on steel surfaces |
| CN1047347A (en) * | 1989-05-13 | 1990-11-28 | 河北省石家庄市钢窗总厂 | Hot dipping calorization process for low-carbon steel |
| CN1673406A (en) * | 2005-03-11 | 2005-09-28 | 广州豪然润峰实业有限公司 | Fast thermal alumetizing technology for steel pieces |
| CN200967937Y (en) * | 2006-09-08 | 2007-10-31 | 徐州正菱涂装有限公司 | Highway guard bar with hot-spraying aluminum polyester composite coating |
| CN101974728A (en) * | 2010-11-10 | 2011-02-16 | 武汉苏泊尔炊具有限公司 | Aluminizing process for iron pan |
| CN103014612A (en) * | 2012-11-21 | 2013-04-03 | 中国科学院金属研究所 | Method for performing high-speed aluminizing on slurry without protective atmosphere or protective layer under atmospheric conditions |
| CN203320455U (en) * | 2013-07-08 | 2013-12-04 | 湖北交投四优钢科技有限公司 | Aluminized highway guardrail |
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