CN106391434A - Anticorrosion nodular cast iron pipe and preparation method thereof - Google Patents

Anticorrosion nodular cast iron pipe and preparation method thereof Download PDF

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Publication number
CN106391434A
CN106391434A CN201610786787.8A CN201610786787A CN106391434A CN 106391434 A CN106391434 A CN 106391434A CN 201610786787 A CN201610786787 A CN 201610786787A CN 106391434 A CN106391434 A CN 106391434A
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CN
China
Prior art keywords
iron pipe
ductile iron
coating
corrosion
cast iron
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Pending
Application number
CN201610786787.8A
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Chinese (zh)
Inventor
傅绍军
吕方振
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Tianjin Xueyang Pipe Industry Ltd By Share Ltd
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Tianjin Xueyang Pipe Industry Ltd By Share Ltd
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Priority to CN201610786787.8A priority Critical patent/CN106391434A/en
Publication of CN106391434A publication Critical patent/CN106391434A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00Processes for applying liquids or other fluent materials
    • B05D1/02Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/06Applying particulate materials
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/002Pretreatement
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B05D7/146Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies to metallic pipes or tubes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/22Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
    • B05D7/222Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes of pipes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D163/00Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/03Powdery paints
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08Anti-corrosive paints
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00Metallic substrate
    • B05D2202/10Metallic substrate based on Fe
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2254/00Tubes
    • B05D2254/04Applying the material on the interior of the tube
    • B05D2254/06Applying the material on the interior and exterior of the tube
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2504/00Epoxy polymers

Abstract

The present invention provides an anticorrosion nodular cast iron pipe and a preparation method thereof. The anticorrosion nodular cast iron pipe comprises a body, an inner coating attached to the inner wall of the body, and an outer coating attached to the outer wall of the body. The body is made of nodular cast iron, and the inner coating and the outer coating are made of thermosetting epoxy powder. The thermosetting epoxy powder serves as the anticorrosion coatings of the nodular cast iron pipe, and by utilizing the thermosetting cross-linked molecular structure characteristics and the characteristic of binding with the chemical bond of the nodular cast iron, the obtained coatings are good in corrosion resistance, tough and wearproof, and excellent in impact resistance and bendability performance, and have high adhesive force with the cast iron pipe. The preparation method is simple and easy in production process, a primer is not needed, the curing is quick, the assembly line work is realizable, the coating efficiency is high, and the preparation method is suitable for industrial production.

Description

A kind of anti-corrosion ductile iron pipe and preparation method thereof
Technical field
The present invention relates to technical field of metal anti-corrosion, particularly to a kind of anti-corrosion ductile iron pipe and preparation method thereof.
Background technology
Ductile iron pipe has the advantages that good mechanical properties, interface reliability are high, it is simple to install, and is widely used at present In urban construction, industrial and mining establishment's water delivery, oil transportation, gas transmission etc..Strong with corresponding infrastructure construction to developing of water resource with the whole world Strong demand, and the enhancing of countries in the world environmental consciousness and the reinforcement to draining the drain pollution management, promote sewage network construction Flourish, make ductile iron pipe market be able to high speed development.However, matched corrosion-inhibiting coating species is various, performance is each Different, application is more chaotic.
At present, the outside surface anticorrosion coating of ductile iron pipe include bituminous coating, epoxy coal tar coating, spray zinc add spraying Asphalt caulk, polyurethane coating and polyethylene jacket etc.;Inner surface corrosion-inhibiting coating includes cement mortar liner, epoxy ceramic coating, interior Lining polyurethane coating, interior cover PE film and cement adds epoxy resin liner etc..
And liner cement industry to be existing ductile iron pipe adopt relatively broad anti-corrosion method, liner cement has necessarily Permeability, but there are some problems, such as poor adhesive force, not shock resistance easy to crack, easy cooperating microorganisms, pumped (conveying) medium is easy Contaminated.
Content of the invention
It is an object of the invention to provide a kind of adhesive force is good, not easy to crack, and shock proof anti-corrosion ductile iron pipe and Its preparation method.
The invention provides a kind of anti-corrosion ductile iron pipe, including body be attached respectively to the interior of inboard wall of tube body and outer wall Coating and external coating, described body is spheroidal graphite cast-iron, and described undercoating and external coating are thermoset epoxy powder.
Preferably, described internally coated thickness is 0.35~0.5mm.
Preferably, the thickness of described external coating is 0.35~0.5mm.
Preferably, the nominal diameter of described body is DN80~DN2600.
Preferably, the nominal wall thickness of described body is 4.4~27.9mm.
Present invention also offers a kind of preparation method of anti-corrosion ductile iron pipe described in technique scheme, walk including following Suddenly:
(1) ductile iron pipe is carried out surface preparation, obtain body;
(2) body obtaining described step (1) is heated to application temperature, applies thermosetting in described inboard wall of tube body and outer wall Property epoxy powder, obtains anti-corrosion ductile iron pipe.
Preferably, in described step (1), surface preparation includes ball blast or sandblasting.
Preferably, the derusting grade of described step (1) middle tube body reaches Sa2.5 level, surface depth of abrasion pattern be 0.05~ 0.1mm.
Preferably, the application temperature in described step (2) is 225~235 DEG C.
Preferably, in described step (2), the mode of coating is electrostatic spraying.
The invention provides a kind of anti-corrosion ductile iron pipe, including body be attached respectively to the interior of inboard wall of tube body and outer wall Coating and external coating, described body is spheroidal graphite cast-iron, and described undercoating and external coating are thermoset epoxy powder.The present invention with Thermoset epoxy powder as the corrosion-inhibiting coating of ductile iron pipe, using its thermoset cross-linked molecular structure property and and spheroidal graphite The chemical bonds characteristic of cast iron, the coating obtaining has a very high vitrification point, temperature limit width, can -30~ Keep optimum performance, tough and hard wear resistant, impact resistance and bendability excellent between 100 DEG C, and have splendid attached and cast iron pipe between Put forth effort;And, coating has good chemical resistance, solvent resistance in itself, can resist the acid being transmitted in medium, alkali, The chemical attack of the materials such as salt, Organic substance;There is good insulating properties, electrochemical corrosion can be resisted under cathodic protection effect, Reach the purpose of digital preservation;Latus rectum is unaffected compared with conventional cement liner, and the smooth fluid resistance of coating surface is little, defeated Send medium efficiency higher.Test result indicate that, the anti-corrosion ductile iron pipe coating adhesion that the present invention provides is not less than 20MPa, Anti- 3 ° of bending flawlesses, anti-8J impact is pin-free, and salt spray resistance 1000h anticorrosive coat is unchanged, room temperature acid and alkali-resistance test passes, high temperature And the corrosion of room temperature resistance to Organic substance is qualified, 24h or 48h resistance to cathodic disbonding size is not higher than 6.5mm.
The preparation method production and processing that the present invention provides is simple, and without priming paint, solidification is rapid, can assembly line work, application Efficiency high is it is adaptable to industrialized production.
Specific embodiment
The invention provides a kind of anti-corrosion ductile iron pipe, the undercoating including body, being attached to inboard wall of tube body and attachment In the external coating of tube wall, described body is spheroidal graphite cast-iron, and described undercoating and external coating are thermoset epoxy powder.At this In invention, described internally coated thickness is preferably 0.35~0.5mm, more preferably 0.4~0.45mm.In the present invention, described The thickness of external coating is preferably 0.35~0.5mm, more preferably 0.4~0.45mm.
The present invention does not have special restriction to the size of described body, using spheroidal graphite cast-iron well known to those skilled in the art Manage.In the present invention, the nominal diameter of described body is preferably DN80~DN2600, more preferably DN500~DN2000, Most preferably DN1000~DN1500.In the present invention, the nominal wall thickness of described body is preferably 4.4~27.9mm, more preferably For 10~20mm, most preferably 14~17mm.
The present invention does not have special restriction to the species of described thermoset epoxy powder, is known using those skilled in the art Commercially available thermoset epoxy powder.In the present invention, described thermoset epoxy powder preferably includes following component:100 matter Amount part epoxy resin E-12,10~20 mass parts dicyandiamides, 0.8~1 mass parts levelling agent, 5~10 mass parts toughener, 30~ 40 mass parts fillers and 0.1~20 mass parts pigment, more preferably 100 mass parts epoxy resin E-12,13~16 mass parts are double Cyanogen ammonia, 0.85~0.9 mass parts levelling agent, 6~8 mass parts toughener, 34~37 mass parts fillers and 2~7 mass parts pigment. In the present invention, the particle diameter of described thermoset epoxy powder is preferably not higher than 100 μm, more preferably 32~75 μm.At this In bright, in described thermoset epoxy powder particle diameter be 3~99 μm ratio be 65~70%.
Present invention also offers the preparation method of anti-corrosion ductile iron pipe described in technique scheme, comprise the steps:
(1) ductile iron pipe is carried out surface preparation, obtain body;
(2) body that described step (1) obtains is heated, apply thermoset epoxy powder, obtain anti-corrosion ductile iron pipe.
Ductile iron pipe is carried out surface preparation by the present invention, obtains body.In the present invention, described surface preparation is excellent Choosing includes ball blast or sandblasting.The present invention does not have special restriction to the operation of described ball blast and sandblasting, using people in the art Ball blast known to member and the technical scheme of sandblasting.In the present invention, during described ball blast, the movement rate of shot is preferred For 60~80m/s, more preferably 65~75m/s.In the present invention, the abrasive material of described sandblasting is preferably steel sand.In the present invention, Described pretreatment can remove oxide and the impurity of Surface of Nodular Cast Iron Pipe, improves the adhesive force of coating and body.
In the present invention, after described surface preparation, the derusting grade obtaining body preferably reaches Sa2.5 level, surface anchor Stricture of vagina depth is preferably 0.05~0.1mm.
The present invention preferably purges to body after ball blast or sandblasting terminate.The present invention does not have to the operation of described purging Special restriction, using the technical scheme of purging well known to those skilled in the art.In the present invention, described purging is preferred For compressed air purging;The pressure of described compressed air is preferably not lower than 0.7MPa, more preferably 1~1.2MPa;Described pressure The capacity of contracting air is preferably 18~22m3/min,.In the present invention, the time of described purging is preferably 10~50s, more excellent Elect 30~40s as.
After obtaining body, described body is heated to application temperature by the present invention, applies thermoset epoxy powder, obtains anti-corrosion Ductile iron pipe.The present invention does not have special restriction to the mode of described heating, using body well known to those skilled in the art The technical scheme of heating.In the present invention, described heating is preferably heating in medium frequency.In the present invention, described application temperature It is preferably 225~235 DEG C, more preferably 228~232 DEG C.In the present invention, under described application temperature, the time of insulation is preferably 0.5~2min, more preferably 1~1.5min.
The present invention does not have special restriction to the mode of described coating, using powder coating well known to those skilled in the art Technical scheme.In the present invention, described coating is preferably electrostatic spraying.In the present invention, the voltage of described electrostatic is excellent Elect 60~90kV, more preferably 70~80kV as;The electric current of described electrostatic is preferably 10~20 μ A, more preferably 14~16 μ A. In the present invention, the gun slot of described electrostatic spraying to workpiece distance be preferably 150~300mm, more preferably 200~ 250mm;The velocity pressure of described electrostatic spraying is preferably 0.30~0.55MPa, more preferably 0.35~0.45MPa;Described quiet The atomizing pressure of electrospray is preferably 0.30~0.45MPa, more preferably 0.35~0.40MPa;The clear rifle of described electrostatic spraying Pressure is preferably 0.48~0.52;The powder barrel fluidized pressure of described electrostatic spraying is preferably 0.04~0.10MPa, more preferably 0.06~0.08MPa.
The present invention preferably makes coating levelling solidify after completing described coating, obtains anti-corrosion ductile iron pipe.In the present invention In, described hardening time is preferably 40~140s, more preferably 60~100s.
In order to further illustrate the present invention, the anti-corrosion ductile iron pipe present invention being provided with reference to embodiment and its system Preparation Method is described in detail, but they can not be interpreted as limiting the scope of the present invention.
Embodiment 1:
Ductile iron pipe inside and outside surface sand-blasting process, derusting grade reaches Sa2.5 level (closely white level), and depth of abrasion pattern is average 0.06mm;
Tube surfaces dust, impurities purging are done by the compressed air using the cleaning through oil-water separation and dried Only;
Using intermediate frequency electromagnetic induction heating circle, body is heated uniformly to 233 DEG C, is incubated 1min;
The epoxy powder different hardening time is passed through electrostatic spraying gun even application inside and outside ductile iron pipe body Surface, one-pass film-forming, coating layer thickness undercoating is 0.5mm, and external coating is 0.35mm;
Body trypsin method interior spraying time lag 2 minutes, the epoxy powder undercoating being attached to tube surfaces melts for 2.5 minutes Melt solidification, 0.5 minute melting and solidification of external coating;
It is cooled to less than 60 DEG C using Water spray, obtain anti-corrosion ductile iron pipe.
The anti-corrosion ductile iron pipe flat appearance of the present embodiment offer, uniform color, bubble-free, no cracking and shrinkage cavity, permit Permitted there is slight Pericarpium Citri tangerinae shape decorative pattern.
The anti-corrosion ductile iron pipe that the present embodiment is provided carries out performance test, obtains result as follows:
24h or 48h resistance to cathodic disbonding size≤6.5mm;
Adhesive surface porosity is 1~4 grade;
Section porosity is 1~3 grade;
Anti- 3 ° of bending flawlesses;
Anti- 8J impact is pin-free;
Sled strip test adhesive force rank is 1~2 grade;
Pull open method test adhesive force >=20MPa;
Electrical strength >=30MV/m;
Specific insulation >=1 × 1013Ω·m;
Salt spray resistance 1000h anticorrosive coat is unchanged;
Resistance to 10%HCl, 3%NaCl, 10%H under room temperature2SO4, 10%NaOH corrosion qualified;
Under room temperature, resistance to gasoline, kerosene and diesel corrosion are qualified;
Resistance to original qualified with oilfield sewage corrosion at 80 DEG C;
Wearability (1000g/1000rcs-17 wheel)≤20mg;
High temperature high voltage resistant tests 80 DEG C, and under 14MPa, 16h no bubbles.
Embodiment 2:
Ductile iron pipe body surfaces externally and internally Shot Blasting, derusting grade reaches Sa2.5 level (closely white level), and depth of abrasion pattern is put down All 0.09mm;
Tube surfaces dust, impurities purging are done by the compressed air using the cleaning through oil-water separation and dried Only;
Using intermediate frequency electromagnetic induction heating circle, body is heated uniformly to 227 DEG C, is incubated 0.5min;
Identical epoxy powder hardening time is passed through electrostatic spraying gun even application inside and outside ductile iron pipe body Surface, one-pass film-forming, coating layer thickness undercoating is 0.5mm, and external coating is 0.5mm;
It is attached to melting and solidification in the epoxy powder 1 minute of tube surfaces;
It is cooled to less than 60 DEG C using Water spray, obtain anti-corrosion ductile iron pipe.
The anti-corrosion ductile iron pipe that the present embodiment is provided carries out performance test, obtains result as follows:
The resistance to cathodic disbonding size≤5.5mm of 65 DEG C of 48h;
Adhesive surface porosity is 1~4 grade;
Section porosity is 1~3 grade;
Anti- 3 ° of bending flawlesses;
Anti- 8J impact is pin-free;
Sled strip test adhesive force rank is 1~2 grade;
Electrical strength >=30MV/m;
Specific insulation >=1 × 1013Ω·m;
Salt spray resistance 1000h anticorrosive coat is unchanged;
Resistance to 10%HCl, 3%NaCl, 10%H under room temperature2SO4, 10%NaOH corrosion qualified;
Under room temperature, resistance to gasoline, kerosene and diesel corrosion are qualified;
Resistance to original qualified with oilfield sewage corrosion at 80 DEG C;
Wearability (1000g/1000rcs-17 wheel)≤20mg;
High temperature high voltage resistant tests 80 DEG C, and under 14MPa, 16h no bubbles.
Embodiment 3:
Ductile iron pipe body surfaces externally and internally Shot Blasting, derusting grade reaches Sa2.5 level (closely white level), and depth of abrasion pattern is put down All 0.07mm;
Tube surfaces dust, impurities purging are done by the compressed air using the cleaning through oil-water separation and dried Only;
Using intermediate frequency electromagnetic induction heating circle, body is heated uniformly to 228 DEG C, is incubated 1min;
The epoxy powder different hardening time is passed through electrostatic spraying gun even application inside and outside ductile iron pipe body Surface, one-pass film-forming, coating layer thickness undercoating is 0.5mm, and external coating is 0.5mm;
Body trypsin method interior spraying time lag 1.5 minutes, the epoxy powder undercoating being attached to tube surfaces melts for 2 minutes Melt solidification, 0.5 minute melting and solidification of external coating;
It is cooled to less than 60 DEG C using Water spray, obtain anti-corrosion ductile iron pipe.
The anti-corrosion ductile iron pipe flat appearance of the present embodiment offer, uniform color, bubble-free, no cracking and shrinkage cavity, permit Permitted there is slight Pericarpium Citri tangerinae shape decorative pattern.
The anti-corrosion ductile iron pipe that the present embodiment is provided carries out performance test, obtains result as follows:
48h resistance to cathodic disbonding size≤6.5mm;
Adhesive surface porosity is 1~4 grade;
Section porosity is 1~3 grade;
Anti- 3 ° of bending flawlesses;
Anti- 8J impact is pin-free;
Sled strip test adhesive force rank is 1~2 grade;
Pull open method test adhesive force >=20MPa;
Electrical strength >=30MV/m;
Specific insulation >=1 × 1013Ω·m;
Salt spray resistance 1000h anticorrosive coat is unchanged;
Resistance to 10%HCl, 3%NaCl, 10%H under room temperature2SO4, 10%NaOH corrosion qualified;
Under room temperature, resistance to gasoline, kerosene and diesel corrosion are qualified;
Resistance to original qualified with oilfield sewage corrosion at 80 DEG C;
Wearability (1000g/1000rcs-17 wheel)≤20mg;
High temperature high voltage resistant tests 80 DEG C, and under 14MPa, 16h no bubbles.
As can be seen from the above embodiments, the anti-corrosion spheroidal graphite cast-iron pipe coating tough and hard wear resistant that the present invention provides, impact resistance And bendability is excellent, and there is splendid adhesive force and cast iron pipe between;And, coating have in itself good chemical resistance, Solvent resistance, can resist the chemical attack of the materials such as the acid being transmitted in medium, alkali, salt, Organic substance.
The above is only the preferred embodiment of the present invention, and not the present invention is made with any pro forma restriction.Should Point out, for those skilled in the art, under the premise without departing from the principles of the invention, if can also make Dry improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.

Claims (10)

1. a kind of anti-corrosion ductile iron pipe, the undercoating including body, being attached to inboard wall of tube body and be attached to the outer of tube wall Coating, described body is spheroidal graphite cast-iron, and described undercoating and external coating are thermoset epoxy powder.
2. anti-corrosion ductile iron pipe according to claim 1 it is characterised in that described internally coated thickness be 0.35~ 0.5mm.
3. anti-corrosion ductile iron pipe according to claim 1 and 2 is it is characterised in that the thickness of described external coating is 0.35 ~0.5mm.
4. anti-corrosion ductile iron pipe according to claim 1 it is characterised in that described body nominal diameter be DN80~ DN2600.
5. anti-corrosion ductile iron pipe according to claim 4 it is characterised in that described body nominal wall thickness be 4.4~ 27.9mm.
6. a kind of preparation method of anti-corrosion ductile iron pipe described in Claims 1 to 5 any one, comprises the steps:
(1) ductile iron pipe is carried out surface preparation, obtain body;
(2) body obtaining described step (1) is heated to application temperature, applies thermosetting ring in described inboard wall of tube body and outer wall Oxygen powder, obtains anti-corrosion ductile iron pipe.
7. preparation method according to claim 6 it is characterised in that in described step (1) surface preparation include ball blast Or sandblasting.
8. preparation method according to claim 6 is it is characterised in that the derusting grade of described step (1) middle tube body reaches Sa2.5 level, surface depth of abrasion pattern is 0.05~0.1mm.
9. preparation method according to claim 6 it is characterised in that application temperature in described step (2) be 225~ 235℃.
10. preparation method according to claim 6 is it is characterised in that the mode applying in described step (2) is electrostatic Apply.
CN201610786787.8A 2016-08-31 2016-08-31 Anticorrosion nodular cast iron pipe and preparation method thereof Pending CN106391434A (en)

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CN106883738A (en) * 2017-03-27 2017-06-23 德施普科技发展温州有限公司 A kind of ductile iron pipe with Corrosion Protection and preparation method thereof
CN109092638A (en) * 2018-10-17 2018-12-28 杭州奔宇科技有限公司 A kind of pipeline coatings technique
CN109290157A (en) * 2018-09-13 2019-02-01 山东国铭球墨铸管科技有限公司 A kind of production technology of ductile iron pipe liner epoxy resin

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