CN105131660A - Rebar corrosion resistant coating and coating method therefor - Google Patents
Rebar corrosion resistant coating and coating method therefor Download PDFInfo
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- CN105131660A CN105131660A CN201510532166.2A CN201510532166A CN105131660A CN 105131660 A CN105131660 A CN 105131660A CN 201510532166 A CN201510532166 A CN 201510532166A CN 105131660 A CN105131660 A CN 105131660A
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Abstract
The invention discloses a rebar corrosion resistant coating, and raw material comprises the following components: 45-70 parts of glass powder, 2-8 parts of clay, 26-50 parts of borax, 0.5-3 parts of fiber, 5-15 parts of opacifier, 1-10 parts of adherence agent and 0.25-2.8 parts of electrolyte. The invention further discloses a rebar corrosion resistant coating coating method, comprising the following step of: 1) dry mixing; 2) wet mixing; 3) pre-treating; 4) coating; 5) drying; 6) sintering; and 7) cooling at room temperature. The rebar corrosion resistant coating is high in ductility, high in adhesion performance, high in compactness and excellent in corrosion resistance, the fiber is introduced into the coating so that the corrosion resistant coating, during the breaking process, absorbs energy through mechanisms such as crack deflection, fiber breakage and fiber and removal, so that the coating toughness is improved, the cracking formation is delayed, and the mechanical property of the rebar can be maintained at the same time.
Description
Technical field
The invention belongs to the metal material field for concrete structure, especially relate to a kind of steel bar anti-corrosion coating and coating method thereof.
Background technology
Enter 21 century, China has marched toward the epoch of coastal economy great development, can predict in following one period and large quantities of sea port dock, Oversea bridge, tunnel, offshore production platform etc. will be had to use skeleton construction.Steel Bars in Concrete Structure is become the principal element affecting Steel Concrete weather resistance by corrosion.Therefore, utilizing novel material, new technology to solve corrosion of reinforcing steel bar is one of the most urgent task of facing of current field of civil engineering scientific worker.
That studies along with Reinforcing Steel Bar In Reinforced Concrete Structure corrosion and protective mechanism deepens continuously, and reinforcing bar film coating technique obtains and develops rapidly.Reinforcing bar film coating technique can be divided into three kinds by coated material at present: (1) metallic substance.As stainless steel hot spray-on coating reinforcing bar, galvanizing steel etc.; (2) organic materials.As Epoxy Resin Coated Steel Bars; (3) inorganic materials.As phosphate coating reinforcing bar, porcelain glaze coating reinforcing bar etc.
From engineering application state analysis, adopt metallic substance to carry out coating to reinforcing bar, cost is higher, and the 2-5 usually reaching regular reinforcement price doubly, therefore can not large batch ofly be applied in the coastal heavy construction of seriously corroded.
Adopt epoxy resin coating reinforcing bar, generally adopt electrostatic coating method, epoxy powder is sprayed on the surface of Ribbed Bar and plain bar, make it form a kind of reinforcing bar with surrounding layer.As China Patent No. CN201593271 discloses " a kind of Epoxy Resin Coated Steel Bars ", be coated with epoxy coating at rebar surface, it efficiently solves the problem that bar construction is easily corroded, and can improve the work-ing life of buildings.Although Epoxy Resin Coated Steel Bars has good solidity to corrosion, obviously reduce with concrete cohesive strength, and epoxy coating exposes easily oxidized in atmosphere, its antiseptic property is greatly affected.
Chinese patent CN103074960 discloses " a kind of double-deck Epoxy Resin Coated Steel Bars and preparation method thereof ", and it comprises basic unit's reinforcing bar, scribbles coating, be coated with external coating (EC) outside undercoat outside basic unit's reinforcing bar.External coating (EC) has more Wear-resistant corrosion-resistant performance, can meet the needs of the construction project under various severe environment.But still there is following problem: 1, between its outer field epoxy resin and concrete, cohesive force is still weak; 2, for ensureing the bonding of two coating interface, accurate technical equipment support is needed; 3, two coating makes cost double, and economy is not good.
Chinese patent CN104404502 discloses " a kind of phosphate base steel bar anti-corrosion coating ", this patent relates to a kind of corrosion resistant coating material for reinforcing bar in Marine reinforced concrete structure, the excellent bonding performance of this corrosion protection coating and rebar surface, compact structure, cured strength is high.But its essence belongs to binding agent, can be used for concrete breakage and repair, but there is phosphate binders at tension state, the easily problem of cracking.
Adopt organic materials to carry out overlay film corrosionproof protection to reinforcing bar, because its main component is organic substance, border on the sea in environment in geomantic omen Exposure to Sunlight, coating can occur aging in time; Adopt inorganic materials to carry out overlay film corrosionproof protection to reinforcing bar, coating is grouped into overcomes organic coating shortcoming aging in time from one-tenth, but coating fragility increases greatly, limits its application in building iron.Building iron is in force and deformation state always; corrosion protection coating unavoidably also can be followed reinforcing bar and certain distortion is occurred; once coating reaches deformation limit; will ftracture; cause the protection of coating to reinforcing bar greatly to decline, this has suitable ductility to maintain protection to reinforcing bar with regard to needing coating.
In sum, existing steel bar anti-corrosion coating technology can not adapt to the steel bar anti-corrosion in the concrete structure in high corrosive environment, therefore find a kind of low cost, weather resistance is better, antiseptic property is better, ductility is high corrosion protection coating extremely coating method become a kind of and be badly in need of.
Summary of the invention
In order to overcome the deficiency that prior art exists, the steel bar anti-corrosion coating and the spraying method thereof that the invention provides that a kind of antiseptic property is good, cohesiveness is strong, there is better ductility.
The technical solution adopted for the present invention to solve the technical problems is: a kind of steel bar anti-corrosion coating, and its raw material comprises following component: glass powder 45-70 part, clay 2-8 part, borax 25-50 part, fiber 0.5-3 part, opacifying agent 5-15 part, adhesive agent 1-10 part, ionogen 0.25-2.8 part.Clay itself is a kind of refractory materials, not easily melts, but adds on a small quantity in powder system, the water of upper lower leaf originally and powder can be made to be mixed into slurry, inhibit the demixing phenomenon of powder and water.Borax is the important composition material of enamel dense structure, again in enamel sintering process, plays reduction sintering temperature, improves the effect of sintering character.Borax melts prior to glass powder, and is bonded in around glass powder, with glass powder generation complex chemical reaction, accelerates glass powder and transforms to enamel.Opposing glass powder, borax consumption is very few, and coating sintering temperature is too high, economical not good; Too much, excessive borax cannot be combined with glass powder, can hinder the formation of glass powder-borax agent structure on the contrary for borax and glass powder borax consumption, finally affects the intensity of coating structure.
Further, described fiber is silicon carbide fiber and/or basalt fibre/or polycrystalline mullite fibre and/or Zirconium oxide fibre.Above-mentioned fiber all belongs to fiber that is high temperature resistant, high strength, and it is added to the toughness that protective system effectively can strengthen coating, delays corrosion protection coating cracking, improves the work-ing life of reinforcing bar.
Further, the weight ratio of described glass powder and fiber is (15-60): 1.Need to control the consumption of fiber in glass powder, fiber and powder are the material of two kinds of different shapes and system in essence, mutual combination relies on powder sintering parcel fiber to complete both bondings, and cohesive force between the two is also the reason that fiber can strengthen coating ductility.Too much fiber, causes powder cannot wrap up fiber completely, is also waste the one of fiber simultaneously.Very few fiber, fiber improves not obvious to coating ductility.
Further, described glass powder and clay cross 300-500 mesh sieve respectively.
Further, described opacifying agent is one or more in fluorite, zirconium dioxide, titanium oxide, stannic oxide.
Further, described adhesive agent are one or more in a cobaltous oxide, nickel protoxide, molybdic oxide, antimonous oxide, aluminum oxide.
Further, described ionogen is one or more in sodium carbonate, tripoly phosphate sodium STPP, Sodium hexametaphosphate 99, SODIUM PHOSPHATE, MONOBASIC.Ionogen is water-soluble, can ionize out ion, and ion is hydrophilic, can be adsorbed on around the oxide compounds such as nickel oxide again, thus plays the effect helping oxide compound to disperse in the slurry.The electrolytical kind of choose reasonable and content can better help slurry to mix, and improve the performance of the rear coating of slurry sintering.
The invention also discloses a kind of coating method of steel bar anti-corrosion coating, comprise the steps:
1) be dry mixed: pour in container by the glass powder weighed by component ratio and clay, borax, fiber, opacifying agent, adhesive agent, ionogen, mix is even, is placed in abundant stirring of mixer and obtains mixture A;
2) wet mixing: add water in mixture A, the mass ratio of mixture A and water is (2-3): 1, is placed in mixer and is fully mixed to get slurry coating material B, for subsequent use;
3) pre-treatment: processing of rust removing is carried out to rebar surface, cleans up post-drying;
4) apply: by step 3) in the reinforcing bar that obtains immerse step 2) in the mixture B feed liquid that obtains, extract out from coating B while reinforcing bar is rotated;
5) dry: by step 4) in coating reinforcing bar be placed in 90-130 DEG C at dry;
6) sinter: by step 5) in the sintering that obtains have the reinforcing bar of coating B to be placed in electric furnace to be warming up to 500-650 DEG C with the speed of 5-8 DEG C/min, to sinter 10 minutes;
7) normal temperature cooling, to obtain final product.
Strict control bake out temperature: too high bake out temperature can make the water rapid evaporation in coating, causes coat inside to expand, the compactness of coating after impact sintering.Too low bake out temperature, considerably increases drying time, consumes multiple-energy-source.
The present invention with glass powder, borax, high-temperature fibre for main raw material, and mix several oxide high-temperature fusing after sintering at rebar surface, as the protective layer of reinforcing bar.Reinforcing bar and concrete cohesive strength in buildings effectively can be improved as the glass powder of inorganic materials and borax.High temperature sintering is adopted to form protective layer fine and close together by combining closely after various component melts.When reinforcing bar in building structure stressed cause distortion time, accordingly, the corrosion protection coating being wrapped in rebar surface also can produce certain deformation, and the high-temperature fibre in coating can utilize himself high-strength characteristic and toughness, delay the dehiscence process of corrosion protection coating, and then enhance the ductility of corrosion protection coating, improve the work-ing life of reinforcing bar.
The maximum operation (service) temperature of silicon carbide fiber reaches 1200 DEG C, and intensity reaches 1960-4410MPa, and under maximum operation (service) temperature, strength retention is more than 80%, and modulus is 176.4-294GPa, and chemical stability is good.
Basalt fibre tolerates 760 DEG C of high temperature, and 600 DEG C time, its tensile strength can keep more than 80%, its maximum tensile strength 3.2GPa, and modulus is 90GPa, and density is 2.75g.cm
-3.
The fiber design parameter that the present invention adopts is as follows:
As can be known from the above table, silicon carbide fiber, basalt fibre be belong to high temperature resistant, the inorganic fibre of high strength.Its tensile strength is all more than 2 times of reinforcing bar; Little (the 2g.cm of density
-3), filament diameter thin (12um), is not only conducive to the dispersion of fiber, and can greatly reduces the consumption of fiber; Wherein, the use temperature that silicon carbide fiber is 1100 DEG C, far above enamel sintering temperature.The research (tieing up general journal of writings: " research of Unidirectional SiClx short fiber reinforced glass ceramic material bend fracture behavior ") of nearest scholar shows that silicon carbide fiber effectively can improve the breaking tenacity of glass ceramic composite material, the toughness of reinforced composite.Basalt fibre is 600 DEG C time, and tensile strength retention is also more than 80%.
The advantage that the present invention has and positively effect are the resistance to corrosions that (1) gives prominence to.The steel bar anti-corrosion coating that with the addition of high-temperature fibre fired by low thermo-paint significantly can promote the corrosion resistance of reinforcing bar, reaches the 1.5-2.5 of regular reinforcement corrosion resistance doubly; (2) give prominence to concrete binding ability; (3) material self weather resistance is strong.Low thermo-paint is inorganic materials, self has stronger weather resistance, can play a role for a long time, effectively; (4) ductility is high.The strain value of reinforcing bar when tension crack being covered with corrosion protection coating increases.
In sum, the invention has the beneficial effects as follows, coating ductility is high, adhesive property good, compactness is good, antiseptic property is good, fiber being introduced coating makes corrosion protection coating in breaking-down process, energy is absorbed by mechanism such as crack deflection, fibre breakage and spike protein gene, increase the toughness of coating, delay cracking and formed, the mechanical property of reinforcing bar self can be kept simultaneously.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is the structural form figure of extexine under scanning electron microscope that the present invention is coated in the corrosion protection coating on reinforcing bar.
Fig. 2 is of the present inventionly coated in corrosion protection coating depth on reinforcing bar to the structural form figure under scanning electron microscope.
Embodiment
Better the present invention program is understood in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, clear, complete description is carried out to the technical scheme in inventive embodiments, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
Embodiment 1
Pre-treatment: get one section of reinforcing bar, rinses surface derusting with the dilute sulphuric acid again with 5% after dry sanding paper rust cleaning, then rinses well with clear water, dry for standby.
Produce coating: glass powder and clay are crossed 300 mesh sieves respectively, get 54 parts sieve after glass powder and 5 parts sieve after clay, 33 parts of boraxs, 1.0 parts of basalt fibres, 1.0 parts of zirconium dioxides, 3.6 parts of fluorites, 0.9 part of cobalt monoxide, 1.0 parts of nickel protoxides, 0.5 part of sodium carbonate, add in mixing tank and tentatively stir evenly by stirring rod, again mixing tank is placed in mixer to be dry mixed, until batch mixing uniform color, be fully mixed to get mixture A.Add in mixture A after being dry mixed, wherein the mass ratio of mixture A and water is 2.5:1, stirred until in pulpous state, insert in mixer and carry out wet mixing 5-7 minute, fully be mixed to get coating B, take out coating B to be placed in container and to leave standstill 10 minutes, observe coating B without layering, top layer is anhydrous secretes.Coating B is poured in accumulator tank for subsequent use.
Ionogen and the water yield can affect the viscosity of coating B, select sodium carbonate as ionogen, and sodium carbonate amount is 0.5% of mixture A gross weight, when the mass ratio of mixture A and water is 2:1, the viscosity of coating B is moderate, and when reinforcing bar is extracted out from coating B, coating applies naturally equably, when baking oven put into by reinforcing bar, coating B does not have slip and the drippage of naked eyes.
Coating: clamp pretreated reinforcing bar with iron clamp, immerses reinforcing bar in coating B, while slow circumvolve reinforcing bar, reinforcing bar is extracted out from coating B, ensures surface of reinforced bar uniform application coating B.
Dry: place two pieces of fire-resistant cushion blocks in an oven, the reinforced frame extracted out is stood on two pieces of fire-resistant cushion blocks, make the reinforcing bar part scribbling coating B be suspended in baking oven from coating B, dry at 90 DEG C.
Sintering: the dry reinforcing bar taken out from baking oven is put into electric furnace and heat up with the speed of 7 DEG C/min, until temperature reaches 620 DEG C, heat preservation sintering 10 minutes, naturally cools to room temperature, namely obtains the reinforcing bar being coated with protective system.
Embodiment 2
Pre-treatment: get one section of reinforcing bar, rinses surface derusting with the dilute sulphuric acid again with 5% after dry sanding paper rust cleaning, then rinses well with clear water, dry for standby.
Produce coating: glass powder and clay are crossed 400 mesh sieves respectively, get 54 parts sieve after glass powder and 3.8 parts sieve after clay, 32 parts of boraxs, 1.5 parts of silicon carbide fibers, 1.0 parts of zirconium dioxides, 0.7 part of cobalt monoxide, 0.8 part of nickel protoxide, 4.5 parts of fluorites, 1.7 parts of SODIUM PHOSPHATE, MONOBASIC, add in mixing tank and tentatively stir evenly by stirring rod, again mixing tank is placed in mixer to be dry mixed, until batch mixing uniform color, be fully mixed to get mixture A.Add in mixture A after being dry mixed, wherein the mass ratio of mixture A and water is 2.5:1, stirred until in pulpous state, insert in mixer and carry out wet mixing 5-7 minute, fully be mixed to get coating B, take out coating B to be placed in container and to leave standstill 10 minutes, observe coating B without layering, top layer is anhydrous secretes.Coating B is poured in accumulator tank for subsequent use.
Coating: clamp pretreated reinforcing bar with iron clamp, immerses reinforcing bar in coating B, while slow circumvolve reinforcing bar, reinforcing bar is extracted out from coating B, ensures surface of reinforced bar uniform application coating B.
Dry: place two pieces of fire-resistant cushion blocks in an oven, the reinforced frame extracted out is stood on two pieces of fire-resistant cushion blocks, make the reinforcing bar part scribbling coating B be suspended in baking oven from coating B, dry at 130 DEG C.
Sintering: the dry reinforcing bar taken out from baking oven is put into electric furnace and heat up with the speed of 5 DEG C/min, until temperature reaches 600 DEG C, heat preservation sintering 10 minutes, naturally cools to room temperature, namely obtains the reinforcing bar being coated with protective system.
Embodiment 3
Pre-treatment: get one section of HRB400 level Φ 12 reinforcing bar, rinses surface derusting with the dilute sulphuric acid again with 5% after dry sanding paper rust cleaning, then rinses well with clear water, dry for standby.
Produce coating: glass powder and clay are crossed 300 mesh sieves respectively, get 54 parts sieve after glass powder and 4.6 parts sieve after clay, 29 parts of boraxs, 2.5 parts of polycrystalline mullite fibres, 3.0 parts of zirconium dioxides, 0.9 part of cobalt monoxide, 1.0 parts of nickel protoxides, 2.0 parts of stannic oxide, 2.5 parts of molybdic oxides, 0.5 part of Sodium hexametaphosphate 99, add in mixing tank and tentatively stir evenly by stirring rod, again mixing tank is placed in mixer to be dry mixed, until batch mixing uniform color, be fully mixed to get mixture A.Add in mixture A after being dry mixed, wherein the mass ratio of mixture A and water is 2.7:1, stirred until in pulpous state, insert in mixer and carry out wet mixing 5-7 minute, fully be mixed to get coating B, take out coating B to be placed in container and to leave standstill 10 minutes, observe coating B without layering, top layer is anhydrous secretes.Coating B is poured in accumulator tank for subsequent use.
Coating: clamp pretreated reinforcing bar with iron clamp, immerses reinforcing bar in coating B, while slow circumvolve reinforcing bar, reinforcing bar is extracted out from coating B, ensures surface of reinforced bar uniform application coating B.
Dry: place two pieces of fire-resistant cushion blocks in an oven, the reinforced frame extracted out is stood on two pieces of fire-resistant cushion blocks, make the reinforcing bar part scribbling coating B be suspended in baking oven from coating B, dry at 110 DEG C.
Sintering: the dry reinforcing bar taken out from baking oven is put into electric furnace and heat up with the speed of 5 DEG C/min, until temperature reaches 570 DEG C, heat preservation sintering 10 minutes, naturally cools to room temperature, namely obtains the reinforcing bar being coated with protective system.
Embodiment 4
Pre-treatment: get one section of HRB400 level Φ, 12 grades of reinforcing bars, rinses surface derusting with the dilute sulphuric acid again with 5% after dry sanding paper rust cleaning, then rinses well with clear water, dry for standby.
Produce coating: glass powder and clay are crossed 400 mesh sieves respectively, get 57 parts sieve after glass powder and 5.1 parts sieve after clay, 25 parts of boraxs, 0.5 part of Zirconium oxide fibre, 4.0 parts of zirconium dioxides, 1.5 parts of cobalt monoxides, 1.9 parts of nickel protoxides, 5.0 parts of fluorites, 1.0 parts of tripoly phosphate sodium STPPs, add in mixing tank and tentatively stir evenly by stirring rod, again mixing tank is placed in mixer to be dry mixed, until batch mixing uniform color, be fully mixed to get mixture A.Add in mixture A after being dry mixed, wherein the mass ratio of mixture A and water is 2.5:1, stirred until in pulpous state, insert in mixer and carry out wet mixing 5-7 minute, fully be mixed to get coating B, take out coating B to be placed in container and to leave standstill 10 minutes, observe coating B without layering, top layer is anhydrous secretes.Coating B is poured in accumulator tank for subsequent use.
Coating: clamp pretreated reinforcing bar with iron clamp, immerses reinforcing bar in coating B, while slow circumvolve reinforcing bar, reinforcing bar is extracted out from coating B, ensures surface of reinforced bar uniform application coating B.
Dry: place two pieces of fire-resistant cushion blocks in an oven, the reinforced frame extracted out is stood on two pieces of fire-resistant cushion blocks, make the reinforcing bar part scribbling coating B be suspended in baking oven from coating B, dry at 120 DEG C.
Sintering: the dry reinforcing bar taken out from baking oven is put into electric furnace and heat up with the speed of 5 DEG C/min, until temperature reaches 620 DEG C, heat preservation sintering 10 minutes, naturally cools to room temperature, namely obtains the reinforcing bar being coated with protective system.
Embodiment 5
Pre-treatment: get one section of HRB400 level Φ, 12 grades of reinforcing bars, rinses surface derusting with the dilute sulphuric acid again with 5% after dry sanding paper rust cleaning, then rinses well with clear water, dry for standby.
Produce coating: glass powder and clay are crossed 325 mesh sieves respectively, get 48 parts sieve after glass powder and 7.1 parts sieve after clay, 32 parts of boraxs, 0.7 part of silicon carbide fiber, 2.7 parts of zirconium dioxides, 2.0 parts of cobalt monoxides, 3.5 parts of nickel protoxides, 3.5 parts of fluorites, 0.5 part of sodium carbonate, add in mixing tank and tentatively stir evenly by stirring rod, again mixing tank is placed in mixer to be dry mixed, until batch mixing uniform color, be fully mixed to get mixture A.Add in mixture A after being dry mixed, wherein the mass ratio of mixture A and water is 2.9:1, stirred until in pulpous state, insert in mixer and carry out wet mixing 5-7 minute, fully be mixed to get coating B, take out coating B to be placed in container and to leave standstill 10 minutes, observe coating B without layering, top layer is anhydrous secretes.Coating B is poured in accumulator tank for subsequent use.
Coating: clamp pretreated reinforcing bar with iron clamp, immerses reinforcing bar in coating B, while slow circumvolve reinforcing bar, reinforcing bar is extracted out from coating B, ensures surface of reinforced bar uniform application coating B.
Dry: place two pieces of fire-resistant cushion blocks in an oven, the reinforced frame extracted out is stood on two pieces of fire-resistant cushion blocks, make the reinforcing bar part scribbling coating B be suspended in baking oven from coating B, dry at 100 DEG C.
Sintering: the dry reinforcing bar taken out from baking oven is put into electric furnace and heat up with the speed of 5 DEG C/min, until temperature reaches 590 DEG C, heat preservation sintering 10 minutes, naturally cools to room temperature, namely obtains the reinforcing bar being coated with protective system.
In order to verify the effect of steel bar anti-corrosion coating of the present invention and coating method, test.
1) get five groups respectively, often organize six roots of sensation reinforcing bar and evenly apply protective system of the present invention, be placed in the sodium chloride solution of 5%, after energising, carry out accelerated corrosion test.
Table 1 reinforcing bar accelerated corrosion test
Can obtain from table 1, protective system low temperature of the present invention is coated on the surface of reinforcing bar, again reinforcing bar is placed in the sodium chloride solution of 5%, reinforcing bar keep the time be not corroded be without coated reinforcement 1.5-2.5 doubly, therefore steel bar anti-corrosion coating of the present invention effectively can delay the corrosion of reinforcing bar in water, and not fibrous coating and respectively containing the coating of various fiber, the corrosion-resistant time of reinforcing bar is substantially identical, and the visible erosion resistance of fiber on corrosion protection coating of adding does not affect substantially.
2) respectively regular reinforcement and the reinforcing bar being coated with protective system of the present invention are cast in concrete, after maintenance, carry out pull test reinforcing bar and concrete bond effect.
Table 2 pull
Can obtain from table 2, the cohesive strength be coated with between the reinforcing bar of protective system of the present invention and concrete obviously increases.
And as can be seen from Figure 1, after various powder sintering, leaving rough surface, coarse outside surface is conducive to the bonding of coating in concrete.As can be seen from Figure 2, be coating appearance layer on the upside of picture, downside is the internal layer near reinforcing bar, and the aperture in coating stays after the inner normal chemical reaction of powder, and each hole is isolated from each other.In conjunction with two pictures, can find that coatingsurface is coarse, firmly, tiny blind hole is roughly uniformly distributed, the coated parcel of fiber, has greatly delayed cracking when coating is out of shape with reinforcing bar, has enhanced the ductility of coating in inner combination.
3) mechanical property of reinforcing bar of the present invention after coating impregnating material
The present invention relates to the pyroprocessing (500-650 DEG C) to reinforcing bar, well-known reinforcing bar intensity after pyroprocessing can change, and table 3 shows reinforcing bar and is being 200 DEG C, 400 DEG C, 600 DEG C, the intensity after 800 DEG C of thermal treatments and mode of appearance change.
Mechanical property after table 3 reinforcing bar pyroprocessing
Can obtain from table 3, when reinforcing bar is subject to pyroprocessing, when particularly temperature is more than 600 DEG C, the yield strength of reinforcing bar obviously declines, and when more than 800 DEG C, its ultimate strength declines comparatively large, and cold-bending property is also poor, and larger change occurs formalness.Sintering temperature of the present invention is below 650 DEG C, and larger change can not occur its mechanical property, ensure that the original performance of reinforcing bar.
4) tension test of reinforcing bar of the present invention after coating impregnating material
Fire the plain bar of fibrous corrosion protection coating and the plain bar of not fibrous corrosion protection coating respectively, stick foil gauge respectively on its surface, when measuring steel bar stretching, strain value during coating cracking.
The tension test of table 4 band coating reinforcing bar
The strain value of the reinforcing bar of various fibrous coating when tension crack is all greater than the reinforcing bar of not fibre-bearing coating as can be seen from Table 4, illustrates that the interpolation of fiber improves the ductility of corrosion protection coating.
Above-mentioned embodiment is used for explaining and the present invention is described, instead of limits the invention, and in the protection domain of spirit of the present invention and claim, any amendment make the present invention and change, all fall into protection scope of the present invention.
Claims (8)
1. a steel bar anti-corrosion coating, is characterized in that: its raw material comprises following component: glass powder 45-70 part, clay 2-8 part, borax 25-50 part, fiber 0.5-3 part, opacifying agent 5-15 part, adhesive agent 1-10 part, ionogen 0.25-2.8 part.
2. steel bar anti-corrosion coating according to claim 1, is characterized in that: described fiber is silicon carbide fiber and/or basalt fibre/or polycrystalline mullite fibre and/or Zirconium oxide fibre.
3. steel bar anti-corrosion coating according to claim 1, is characterized in that: the weight ratio of described glass powder and fiber is (15-60): 1.
4. steel bar anti-corrosion coating according to claim 1, is characterized in that: described glass powder and clay cross 300-500 mesh sieve respectively.
5. steel bar anti-corrosion coating according to claim 1 and 2, is characterized in that: described opacifying agent is one or more in fluorite, zirconium dioxide, titanium oxide, stannic oxide.
6. steel bar anti-corrosion coating according to claim 1 and 2, is characterized in that: described adhesive agent are one or more in a cobaltous oxide, nickel protoxide, molybdic oxide, antimonous oxide, aluminum oxide.
7. steel bar anti-corrosion coating according to claim 1 and 2, is characterized in that: described ionogen is one or more in sodium carbonate, tripoly phosphate sodium STPP, Sodium hexametaphosphate 99, SODIUM PHOSPHATE, MONOBASIC.
8. the coating method of steel bar anti-corrosion coating as described in any one of claim 1-7, is characterized in that: comprise the steps:
1) be dry mixed: pour in container by the glass powder weighed by component ratio and clay, borax, fiber, opacifying agent, adhesive agent, ionogen, mix is even, is placed in abundant stirring of mixer and obtains mixture A; 2) wet mixing: add water in mixture A, the mass ratio of mixture A and water is (2-3): 1, is placed in mixer and is fully mixed to get slurry coating material B, for subsequent use;
3) pre-treatment: processing of rust removing is carried out to rebar surface, cleans up post-drying;
4) apply: by step 3) in the reinforcing bar that obtains immerse step 2) in the mixture B feed liquid that obtains, extract out from coating B while reinforcing bar is rotated;
5) dry: by step 4) in be placed in 90-130 DEG C by the reinforcing bar evenly applied at dry;
6) sinter: by step 5) in the sintering that obtains have the reinforcing bar of coating B to be placed in electric furnace to be warming up to 500-650 DEG C with the speed of 5-8 DEG C/min, to sinter 10 minutes;
7) normal temperature cooling, to obtain final product.
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| CN105670366A (en) * | 2016-03-04 | 2016-06-15 | 浙江大学 | Low-porosity coating for steel bar corrosion resistance and application method thereof |
| CN105819691A (en) * | 2016-03-04 | 2016-08-03 | 浙江大学 | Small-aperture inorganic coating layer used for steel bar anticorrosion, and coating method thereof |
| CN106000788A (en) * | 2016-07-27 | 2016-10-12 | 浙江大学 | Preparation device for rebar anticorrosive coating and integrated production system with preparation device |
| CN106187128A (en) * | 2016-07-20 | 2016-12-07 | 安徽省春谷3D打印智能装备产业技术研究院有限公司 | Anticorrosion 3D prints cooling water-cooled road of workpiece and preparation method thereof |
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