CN100519670C - Corrosion resistant nano coating, corrosion resistant steel and preparation method thereof - Google Patents
Corrosion resistant nano coating, corrosion resistant steel and preparation method thereof Download PDFInfo
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- CN100519670C CN100519670C CNB2006100218399A CN200610021839A CN100519670C CN 100519670 C CN100519670 C CN 100519670C CN B2006100218399 A CNB2006100218399 A CN B2006100218399A CN 200610021839 A CN200610021839 A CN 200610021839A CN 100519670 C CN100519670 C CN 100519670C
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Abstract
The present invention belongs to the field of iron and steel surface treating technology, and is especially one kind of nanometer anticorrosive paint, its preparation process and steel rail coated with the paint. The nanometer inorganic paint consists of filming material 20-60 wt%, nanometer pigment 3-8 wt%, antirust assistant 5-15 wt%, other assistants 0.025-4 wt%, and deionized water 30-70 wt%. The nanometer inorganic paint has excellent painting performance, high mechanical strength, high anticorrosive performance, high weather resistance, capacity of forming thin smooth coating with certain conducting performance, and other advantages.
Description
Technical field
The invention belongs to the steel surface process field, be specifically related to a kind of corrosion resistant nano coating, be coated with the rail for preparing with this coating, and preparation method thereof.
Background technology
Along with the application of high duty rails, the corrosion of rail has become one of topmost factor that influences rail work-ing life.
Present on the corrosion resistance nature that improves rail, but technology moulding, complete industrial applications also do not had, only carried out some technical discussion and trials, comprising:
(1) adopt the sacrificing protection method to improve the rail corrosion resisting property;
(2) add alloying elements such as copper, chromium in the rail raw steel, improve the rail corrosion resisting property:
(3) alloy coat such as rail surface thermal spraying aluminum zinc improves the rail corrosion resisting property.
Above-mentioned all rail corrosionproof protections measure of taking all has certain effect, and still, these technology but exist significantly not enough on production technique enforcement and cost:
1, the enforcement of sacrificing protection method is limited by circuit, and the expendable of the current affects railway signal in sacrificing protection loop, and replacing is in addition sacrificed the cost height of zinc metal sheet, can't be applied.
2, in the rail raw steel, add alloying elements such as copper, chromium, though can improve the rail corrosion resisting property, but raw steel cost height, and the smelting of rail steel, Technology such as rolling need be done sizable improvement, and because of the adding of copper, chromium brings side effect to the toughness and the welding property of high carbon steel rail steel, reduced the security that rail uses, thereby failed to promote.
3, some countries of Europe adopt thermal spraying aluminum zinc alloy technology at railroad bridge, railway carriage etc.France once attempted the test of rail thermal spraying aluminum zinc alloy layer; Japan also once to after the rail head of rail derusting by sandblast, sprays the aluminum-zinc alloy coating of 120 μ m again, uses twice bituminous varnish sealing of hole at last.But there is following defective in thermal spraying alloy aluminium spelter coating, can't large-scale promotion use:
A, thermal spraying aluminum are Zinc alloy coated to rail surface derusting class requirement height, need reach the surface treatment " surface should not have visible grease, dirt, oxide skin, iron rust, paint coating and impurity, and the surface has the even metal color and luster " of Sa3.0 level.For neither heavy section more is not the rail of steel plate shape, because section is little and asymmetric, it is very difficult that the surface sand-blasting processing will reach the Sa3.0 level, and it is slow to reduce production rate greatly, and the contour edges such as foot of rail are easily fallen by " cutting ".
B, the homogeneity of the coating of hot dip process guarantees that difficulty is quite big in the plane, and thermospray is thread aluminum-zinc alloy coating on little and asymmetric rail end face, can't guarantee the homogeneity of coating, and facility investment is big, complex process.
C, hot spray coating porosity height need carry out the organic coating sealing treatment.The organic coating sealing of hole needs 2 to be coated with 2 baking technologies.Thermospray need comprise derusting by sandblast, dedusting, thermospray, cool off, be sprayed with organic coating, dry, be sprayed with 8 sections master operations of organic coating, oven dry, and technical process is long, operation is loaded down with trivial details.
In addition, what adopt in " a kind of corrosion-resistant finishes Rail Production technology " (China date of application: on May 26th, 2003 patent No. ZL03117936.3) is coating such as the rich zinc of spraying, rich zinc-aluminium, rich aluminium zinc, this method technological process of production is long, floor space is bigger, the coating that splashes that reaches spraying can't reclaim and form certain pollutent, brings the processing cost problem of higher.Coating moisture-prooves such as rich zinc, rich zinc-aluminium, rich aluminium zinc, salt spray resistance are good, but because zinc, zinc-aluminium, aluminium zinc belong to amphoteric metal, both can with acid-respons, again can with alkali reaction, under acidity and alkaline condition, the hold-time of 75 microns coating is short.
Summary of the invention
One of the technical problem to be solved in the present invention provide a kind of tack height, with low cost, production technique is simple, corrosion resistant inorganic nano paint.This inorganic nano paint is that the component by following weight per-cent is prepared from:
Film forming matter 20～60
Nano dye 3～8
Antirust auxiliary agent 5～15
Other auxiliary agent 0.025～4
Deionized water 30～70;
Film forming matter wherein is at least a in aluminium dihydrogen phosphate or the aluminium dihydrogen tripolyphosphate;
Nano dye wherein is a nano-TiO
2, nanometer SiO
2, in the nano-ZnO one or more;
Antirust auxiliary agent wherein can adopt water-solubility Cr
3+In the water-soluble cpds of the water-soluble cpds of compound, Mo, the water-soluble cpds of W, Zr, the water-soluble cpds of V one or more;
Other auxiliary agent wherein is at least a in Sodium hexametaphosphate 99 or the tripoly phosphate sodium STPP.
Preferably, above-mentioned inorganic nano paint is that component by following weight per-cent is prepared from:
Film forming matter 45
Nano dye 5
Antirust auxiliary agent 8
Other auxiliary agent 1
Deionized water 41.
It is easy that two of the technical problem to be solved in the present invention provides a kind of step, the method for the above-mentioned inorganic nano paint of preparation with low cost.This method may further comprise the steps:
A, take off by proportioning and to state component: film forming matter, nano dye, antirust auxiliary agent, other auxiliary agent, deionized water;
B, get film forming matter and be added to the water, fully dissolving, solution;
C, antirust auxiliary agent join in the solution of step b gained, fully stir, and get mixture;
D, in the mixture of step c gained, add nano dye, it be uniformly dispersed, mixture;
E, in steps d gained mixture, add other auxiliary agent, dispersed with stirring 15～30 minutes, promptly.
Three of the technical problem to be solved in the present invention provides the corrosion resistant steel that a kind of corrosion resisting property is good, weathering resistance is good.The surface of this corrosion resistant steel has the coating that is formed by claim 1 or 2 described inorganic nano paint coatings.
Further, the thickness of above-mentioned coating is 5～45 microns.
Preferably, the thickness of above-mentioned coating is 10～15 microns.
It is easy that four of the technical problem to be solved in the present invention provides a kind of step, the method for the above-mentioned corrosion resistant steel of preparation that raw material availability is high.This method comprises the steps:
A, get common rail, surface derusting removes dust;
B, with the common rail after the surface treatment, inorganic nano paint is applied to the surface of common rail lower jaw to the flange of rail through spray equipment, again coating is wipeed off, the corrosion resistant steel first product;
C, adopt 80 ℃～120 ℃ hot blast, promptly get the corrosion resistant steel finished product after the cooling the inorganic nano coated and dried on step b gained corrosion resistant steel first product surface.
Wherein, the common rail described in the above-mentioned steps a refers to not be coated with the rail of inorganic nano paint of the present invention.These rail all need be removed surperficial rusty stain, dust, other coating etc. in use, expose the basal plane of the steel of rail itself.
Wherein, surface derusting described in the above-mentioned steps a is to use the sandblast apparatus derusting by sandblast, and dedusting is that the air of 30 ℃～35 ℃ hot blast or not heating is removed the dust of rail remained on surface.
Wherein, the nozzle of spray equipment described in the above-mentioned steps b is controlled to be 10cm～20cm to the distance on rail surface, and spray pressure is 3kgf/cm
2～5kgf/cm
2
The nozzle spray angle of spray equipment is 45 °～135 ° among the above-mentioned steps b, and best angle is 135 °.
Cooling is to adopt clean air to blow spray with the cooling coating among the above-mentioned steps d.
Wherein, antirust auxiliary agent of the present invention can be at least a in the following compound: water-soluble trivalent chromium compound, and as chromium sulphate (Cr
2(SO
1)
3), chromium nitrate (Cr (NO
3)
3), chromium chloride (Cr (Cl)
3), the chromic acid guanidine; The water-soluble cpds of Mo, as ammonium molybdate, Sodium orthomolybdate, potassium molybdate; The water-soluble cpds of W, as ammonium tungstate, sodium wolframate, potassium wolframate, ammonium paratungstate; The water-soluble cpds of Zr, as the zirconic acid ammonium, sodium fluozirconate, potassium zirconium, zirconium sulfate, acetic acid zirconium; The water-soluble cpds of V, as ammonium meta-vanadate, sodium metavanadate, potassium metavanadate.
Inorganic nano paint of the present invention selects for use nano-metal-oxide as raw material, and wherein said other auxiliary agent mainly plays the dispersing nanometer material.Need in the preparation process of inorganic nano paint of the present invention before adding nano dye, to add antirust auxiliary agent, in order to avoid destroy the current potential that adds the nano dye dispersed system; The speed of best dispersed with stirring is about 1400 commentaries on classics/min, about 20 minutes optimum dispersion time.
The employed raw material rail of corrosion resistant steel of the present invention should meet the regulation of People's Republic of China's railroad industry standard [TB/T2344-2003] " 43kg/m～75kg/m hot rolled rail order technical qualification ".Wherein used raw material rail can be the rail of new production, also can be to reclaim the rail that meets again production standard, adopts and reclaims the availability that rail can improve steel, can save cost.
Beneficial effect of the present invention is: inorganic nano paint of the present invention has good coating performance and physical strength, corrosion resistance nature and good weatherability, formed coating is thin, smooth in appearance is smooth, have certain conductivity, and low, the easy application of viscosity, with low cost.Advantages such as corrosion resistant steel of the present invention has that preparation is simple, smooth smooth, the material of corrosion resisting property and acid-proof alkaline excellence, appearance of coat is easy to get, and is with low cost.The method steps that the present invention prepares corrosion resistant steel is simple, pre-treatment to rail requires low, the derusting by sandblast grade only need reach the Sa2.0 level and get final product,), coating curing temperature low (80 ℃～120 ℃), set time short (2min is following), coating can be saved cost near 100% utilization, faster production is beneficial to and promotes the use of.
Further specify below by embodiment but do not limit the present invention.
Embodiment
Embodiment one inorganic nano paint preparation of the present invention
The preparation method:
A, take off and state components in weight percentage: aluminium dihydrogen phosphate 20%, nano level TiO
23%, Sodium orthomolybdate 5%, Sodium hexametaphosphate 99 2%, deionized water 70%;
B, aluminium dihydrogen phosphate is added to the water, fully dissolving;
C, Sodium orthomolybdate is joined in the solution of step b, fully stir;
D, in the mixture of step c gained, add nano level TiO
2Nano dye is uniformly dispersed it;
E, in steps d gained mixture, add Sodium hexametaphosphate 99, dispersed with stirring 30 minutes, packing, warehouse-in.Make inorganic nano paint a of the present invention.
Preparation embodiment two inorganic paints of the present invention and rail
The preparation method:
1, inorganic nano paint raw material weight per-cent: aluminium dihydrogen phosphate 60%, nano level ZnO8%, Potassium Zirconium Fluoride 15%, Sodium hexametaphosphate 99 4%, deionized water 13%.
A, take off and state components in weight percentage: 60% aluminium dihydrogen phosphate, 8% nano level ZnO, 15% Potassium Zirconium Fluoride, 4% Sodium hexametaphosphate 99,13% deionized water;
B, get aluminium dihydrogen phosphate and be added to the water, fully dissolving;
C, Potassium Zirconium Fluoride join in the solution of step b, fully stir;
D, in the mixture of step c gained, add nano level ZnO, it is uniformly dispersed;
E, in steps d gained mixture, add Sodium hexametaphosphate 99, dispersed with stirring 20 minutes, packing, warehouse-in.Make inorganic nano paint b of the present invention.
The preparation of embodiment three inorganic paints of the present invention
The preparation method:
A, take off and state components in weight percentage: part by weight is aluminium dihydrogen phosphate and the aluminium dihydrogen tripolyphosphate 35% of 1:1, nano level SiO
25%, chromium nitrate 5%, tripoly phosphate sodium STPP 3%, deionized water 52%;
B, aluminium dihydrogen phosphate and aluminium dihydrogen tripolyphosphate are added to the water, fully dissolving;
C, chromium nitrate join in the solution of step b, fully stir;
D, in the mixture of step c gained, add nano level SiO
2, it is uniformly dispersed;
E, in steps d gained mixture, add tripoly phosphate sodium STPP, dispersed with stirring 15 minutes, packing, warehouse-in.Make inorganic nano paint c of the present invention.
The preparation of embodiment four corrosion resistant steels of the present invention
Inorganic nano paint a with the embodiment of the invention one preparation prepares corrosion resistant steel.
The rail inversion is sent in the sandblasting device, the rail lower jaw is removed substantially to grease, dirt, oxide skin, iron rust, paint coating and the impurity on the surface of the flange of rail, roughness grade reaches the Sa2.0 level.In this process, rail moves ahead by 10m/min speed.
Rail still is sent in the cleaning apparatus with 10m/min speed, with hot blast (30～35 ℃ of temperature) dedusting method with sandblast after the removing residues on rail surface, repeats 2 times, surface cleaning, exsiccant rail entered spray in the groove.
Rail is under roller-way transmits, still with the special airtight spray equipment of 10m/min speed by 1m length.After rail head entered spray equipment, proofing unit was sent out signal, and the nozzle that all directions are arranged in the spray equipment sprays the inorganic nano paint a of the embodiment of the invention one preparation automatically, formed the inorganic anti-corrosion nano coating of one deck at the rail lower jaw to the surface of the flange of rail.Then, rail proceeds to the spraying doctor blade device, and scraper extracts coating and make coating evenly smooth.
And then, rail passes through 20 meters long hot-air seasoning device.Rail head enters drying unit, and hot air apparatus starts, and adopts 80 ℃ hot blast that the rail inorganic coating is dried.
After the rail coated and dried, adopt clean air at room temperature to blow spray cooling coating, get corrosion resistant steel A of the present invention.
Corrosion resistant steel rolls off the production line, and lifting, heap are cut warehouse-in.
The preparation of embodiment five corrosion resistant steels of the present invention
Inorganic nano paint b with the embodiment of the invention one preparation prepares corrosion resistant steel.
Rail is sent in the sandblasting device, the rail lower jaw is removed substantially to grease, dirt, oxide skin, iron rust, paint coating and the impurity on the surface of the flange of rail, roughness grade reaches more than the Sa2.0 level.In this process, rail moves ahead by 5m/min speed.
Rail still is sent in the cleaning apparatus with 5m/min speed, with hot blast (25～35 ℃ of temperature) dedusting method with sandblast after the removing residues on rail surface, surface cleaning, exsiccant rail enter in the spraying groove.
Rail is under roller-way transmits, still with the special airtight spray equipment of 5m/min speed by 1m length.After rail head enters spray equipment, the proofing unit sender, the spray equipment inner roof wall, about the nozzle put of 2 wall cloths spray the inorganic nano paint b of the embodiment of the invention two preparations automatically, to the surface of the flange of rail, form the inorganic anti-corrosion nano coating of one deck at the rail lower jaw.Rail proceeds to the spraying doctor blade device, and scraper extracts coating and make coating evenly smooth.
And then, rail passes through 20 meters long hot-air seasoning device.Rail head enters drying unit, and hot air apparatus starts, and 120 ℃ hot blast is dried the rail inorganic coating.
After the rail coated and dried, adopt clean air at room temperature to blow spray cooling coating, get corrosion resistant steel B of the present invention.
Corrosion resistant steel rolls off the production line, and lifting, heap are cut warehouse-in.
The preparation of embodiment six corrosion resistant steels of the present invention
Inorganic nano paint c with the embodiment of the invention one preparation prepares corrosion resistant steel.
Rail is sent in the sandblasting device, the rail lower jaw is removed substantially to grease, dirt, oxide skin, iron rust, paint coating and the impurity on the surface of the flange of rail, roughness grade reaches the Sa2.0 level.In this process, rail moves ahead by 8m/mi speed.
Rail still is sent in the cleaning apparatus with 8m/min speed, with hot blast (25～35 ℃ of temperature) 2 dedusting methods with sandblast after the removing residues on rail surface, rail enters in the spraying groove with clean, dry surface.
Rail is under roller-way transmits, still with the special airtight spray equipment of 8m/min speed by 1m length.After rail head enters spray equipment, the proofing unit sender, the spray equipment inner roof wall, about the nozzle put of two wall cloths spray the inorganic nano paint c of the embodiment of the invention two preparations automatically, to the surface of the flange of rail, form the inorganic anti-corrosion nano coating of one deck at the rail lower jaw.Rail proceeds to the spraying doctor blade device, and scraper extracts coating and make coating evenly smooth.
And then, rail passes through 20 meters long hot-air seasoning device.Rail head enters drying unit, and hot air apparatus starts, and 100 ℃ hot blast is dried the rail inorganic coating.
After the rail coated and dried, adopt clean air at room temperature to blow spray cooling coating, get corrosion resistant steel C of the present invention.
Corrosion resistant steel rolls off the production line, and lifting, heap are cut warehouse-in.
The detection of test example one inorganic nano paint of the present invention
Detect coating a, the b that the embodiment of the invention one, two, three prepares respectively, the quality of c respectively.Main evaluation index: dope viscosity (flow cup), the settling velocity of nano dye (settling process), solid ingredient (the hot oven drying method of unit volume coating).With existing rail in contrast with corrosion resistant coating Lw-1 inorganic zinc coating (production of Wuhan eisenocher limited liability company).
The Preliminary detection result of table one inorganic nano paint of the present invention
| A (embodiment one) | B (embodiment two) | C (embodiment three) | Reference substance Lw-1 | |
| Dope viscosity | 45 ± 2s | 75 ± 2s | 55 ± 2s | 85 ± 2s |
| The settling velocity of nano dye | 2%/30 day | 0.5%/30 day | 1%/30 day | No nano dye does not have settled notion. |
| Solid ingredient | 37 | 56 | 42 | 68 |
The quality examination of test example two corrosion resistant steels of the present invention
Corrosion resistant steel A, B, C that the embodiment of the invention four, five, six is prepared carry out the detection of indexs such as corrosion resisting property, coating adhesion property, acid-proof alkaline, appearance of coat planeness, conductivity.
Steel produces to climb, and the PD360k/m rail that Lw-1 inorganic zinc coating application thickness 75 μ m are adopted on the surface in contrast.
1, corrosion resisting property detects
Detection method: neutral salt spray accelerated corrosion test.Operative norm: GB/T10125-1997 " artificial atmosphere corrosion test salt-fog test ".Experimental procedure: the sodium chloride aqueous solution of preparation 5%, the solution pH value is PH6.5～7.2, pours in the salt fog cabinet liquid holding groove; Start the salt-spray cabinet power supply, set 35 ℃ ± ℃ of salt fog cabinet test temperatures; Adjust spraying pressure, the salt fog sinkability is at 1～2ml/.h.80cm
2To test rail and contrast the rail coat side and accept face, and be inclined to 20 ° as salt fog; Close salt fog cabinet, and open the salt fog cabinet spray switch and carry out spray testing; Test was 1 cycle with 24h, and the phase sprays continuously weekly.In the process of the test, every 24h OOBA, write down and take pictures.The nascent red rust time of rail coating of accepting face with salt fog can standard as evaluation rail corrosion resistance coating.
Experimental result: the time of the nascent red rust of reference substance (adopting the rail of Lw-1 inorganic zinc coating brushing thickness 75 μ m) coating is 1080 hours (promptly 45 days); The time of the nascent the earliest red rust of rail of the present invention is 1440 hours (promptly 60 days), obviously is better than reference product.
2, the coating adhesion property detects
Detection method: the present invention adopts dynamic load method (the tired load test of three-point bending) and drop weight test to estimate the coating adhesion property of anti-corrosion nano rail of the present invention.
Dynamic load method (the tired load test of three-point bending) loading environment: alternative frequency is the sine wave of 5Hz, load 7.8t～40t, and span 1000mm is loaded into 2 * 10
6Inferior.
Judgement criteria: be loaded into 2 * 10
6Inferior back rail fracture is observed the rail top coat and should not had and come off; Rail fracture position coating answers firm attachment on rail; Rail fracture surface coating is answered consistent with the shape of rail fracture.
The weight of drop weight test condition: 1t is pounded on the rail surface from the height freely falling body of 9m.
The judgement criteria of dropping hammer: the rail not coating of fracture location crackle should not occur, comes off; Rail fracture position coating should be consistent with appearance of fracture.
General evaluation coating adhesion property adopts cross-hatching (to adopt ordinary blade to draw grid on coating, sticking with adhesive tape, see whether the coating on the grid of drawing comes off), draw circle method (it is sticking with adhesive tape again to adopt the wedge angle of similar compasses pin to draw behind the circle), ballistic method (ball of 1kg highly falls from 50cm and pounds coating) etc., be not enough to detect the rail coating in the tack under huge tensile stress and the action of compressive stress of being subjected on the railway line.And dynamic load method (three-point bending tired load test) and drop weight test be the Simulation evaluation rail on railway line in the use train by the time rail condition that whether ruptures, the tack of estimating the rail top coats with these 2 kinds of methods is suitable harshness realistic applicable cases also.
The coating adhesion property that experimental result shows corrosion resistant steel of the present invention is very excellent, can be in the high tack that is subjected to keeping under huge tensile stress and the action of compressive stress coating, and the coating adhesion property of reference substance is also better.
3, acid-proof alkaline detects:
Detection method: the sulphuric acid soln of employing 5% and 25% sodium hydroxide solution soak the rail coating respectively, the record coating shedding time.
Corrosion resistant steel of the present invention soaked in 5% sulphuric acid soln after 8 hours, and coating does not have and comes off; And the coating of reference substance is soaked in 5% sulphuric acid soln, just all comes off in 2 minutes, shows the coating acid resistance excellence of corrosion resistant steel of the present invention.
Corrosion resistant steel of the present invention adopts 25% sodium hydroxide solution to soak the rail coating, soaks after 24 hours, and coating does not have and comes off; And the coating of reference substance is soaked in 25% sodium hydroxide solution, all comes off in 5 minutes, shows corrosion resistant steel coating alkali resistance excellence of the present invention.
4, appearance of coat:
Appearance of coat is smooth smooth: touching the rail coating with hand does not have harsh feeling; Magnification with 300 times under micro-Electronic Speculum is observed coatingsurface pattern, the image of coating no concave-convex injustice.Coating color is canescence or light gray-white.
5, conductivity detects:
Adopt interlamination resistance method testing coating surface resistivity, corrosion resistant steel resistance value of the present invention＜5 Ω/cm
2And contrast rail coatingsurface resistance 50 Ω/cm
2, be better than reference substance.
The quality examination result of table two corrosion resistant steel of the present invention
| A (embodiment four) | B (embodiment five) | C (embodiment six) | Reference substance | |
| Corrosion resisting property | Nascent red rust 1440h | Nascent red rust 1704h | Nascent red rust 1608h | Nascent red rust 1080h |
| The coating adhesion property | Tired load test and drop weight test: coating does not all have and comes off: rail fracture site coating is consistent with appearance of fracture. | Tired load test and drop weight test: coating does not all have and comes off: rail fracture site coating is consistent with appearance of fracture. | Tired load test and drop weight test: coating does not all have and comes off: rail fracture site coating is consistent with appearance of fracture. | Tired load test and drop weight test: coating does not all have and comes off; Rail fracture site coating is consistent with appearance of fracture, but has a little to come off. |
| Acid-proof alkaline | Acidproof 8h does not have the alkaline-resisting 24h that comes off and does not have and come off | Acidproof 8h does not have the alkaline-resisting 24h that comes off and does not have and come off | Acidproof 8h does not have the alkaline-resisting 24h that comes off and does not have and come off | The acidproof 2min alkaline-resisting 5min that comes off comes off |
| Appearance of coat | Light gray-white | Canescence | Canescence | Light grey |
| Conductivity | 3 Ω .cm 2 | 4 Ω .cm 2 | 3.6 Ω .cm 2 | 62.1 Ω .cm 2 |
Above-mentioned specific examples shows: inorganic nano paint corrosion resistance and good of the present invention, resistance to acids and bases and good weatherability, low, the easy application of viscosity, with low cost, formed coating is thin, smooth in appearance is smooth.Corrosion resistant steel of the present invention has smooth more smooth, the advantage such as preparation is simple, with low cost of corrosion resisting property and acid-proof alkaline excellence, appearance of coat.The method steps that the present invention prepares corrosion resistant steel is simple, and is low to the pre-treatment requirement of rail.The derusting by sandblast grade only need reach the Sa2.0 level and get final product, coating curing temperature low (80 ℃～120 ℃), set time short (2min is following), and coating can be near 100%
Utilize, can save cost, faster production is beneficial to and promotes the use of.
Claims (9)
1, a kind of inorganic nano paint is characterized in that being prepared from by the component of following weight per-cent:
Film forming matter 20～60
Nano dye 3～8
Antirust auxiliary agent 5～15
Other auxiliary agent 0.025～4
Deionized water 30～70;
Film forming matter wherein is at least a in aluminium dihydrogen phosphate or the aluminium dihydrogen tripolyphosphate;
Nano dye wherein is a nano-TiO
2, nanometer SiO
2, in the nano-ZnO one or more;
Antirust auxiliary agent wherein adopts water-solubility Cr
3+In the water-soluble cpds of the water-soluble cpds of compound, Mo, the water-soluble cpds of W, Zr, the water-soluble cpds of V one or more;
Other auxiliary agent wherein is at least a in Sodium hexametaphosphate 99 or the tripoly phosphate sodium STPP.
2, inorganic nano paint according to claim 1 is characterized in that being prepared from by the component of following weight per-cent:
Film forming matter 45
Nano dye 5
Antirust auxiliary agent 8
Other auxiliary agent 1
Deionized water 41.
3, a kind of method for preparing claim 1 or 2 described inorganic nano paints, it comprises the steps:
A, take off by proportioning and to state component: film forming matter, nano dye, antirust auxiliary agent, other auxiliary agent, deionized water;
B, get film forming matter and be added to the water, fully dissolving, solution;
C, antirust auxiliary agent join in the solution of step b gained, fully stir, and get mixture;
D, in the mixture of step c gained, add nano dye, it be uniformly dispersed, mixture;
E, in steps d gained mixture, add other auxiliary agent, dispersed with stirring 15～30 minutes, promptly.
4, a kind of corrosion resistant steel is characterized in that the surface has the coating that is formed by claim 1 or 2 described inorganic nano paint coatings.
5, corrosion resistant steel according to claim 4 is characterized in that: the thickness of described coating is 5～45 microns.
6, corrosion resistant steel according to claim 5 is characterized in that: the thickness of described coating is 10～15 microns.
7, a kind of method for preparing each described corrosion resistant steel of claim 4 to 6, it comprises the steps:
A, get common rail, surface derusting removes dust;
B, with the common rail after the surface treatment, inorganic nano paint is applied to the surface of common rail lower jaw to the flange of rail through spray equipment, again coating is wipeed off, the corrosion resistant steel first product;
C, adopt 80 ℃～120 ℃ hot blast, promptly get the corrosion resistant steel finished product after the cooling the inorganic nano coated and dried on step b gained corrosion resistant steel first product surface.
8, the method for preparing corrosion resistant steel according to claim 7, it is characterized in that: surface derusting described in the step a is to use the sandblast apparatus derusting by sandblast, and the dedusting described in the step a is a dust of removing the rail remained on surface with the air of 30 ℃～35 ℃ hot blast or not heating.
9, the method for preparing corrosion resistant steel according to claim 8, it is characterized in that: the nozzle of spray equipment described in the step b is controlled to be 10cm～20cm to the distance on rail surface, and spray pressure is 3kgf/cm
2～5kgf/cm
2
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| CN101634022B (en) * | 2008-07-24 | 2013-03-27 | 中国第一汽车股份有限公司 | Process for corrosion-resistance passivation of ferrite stainless steel for packaging vehicle-mounted SCR |
| CN101725091B (en) * | 2008-10-20 | 2012-07-18 | 攀钢集团研究院有限公司 | Anti-rust steel rail |
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