CN105345388A - Repair method for steel storage tank corrosion pit - Google Patents
Repair method for steel storage tank corrosion pit Download PDFInfo
- Publication number
- CN105345388A CN105345388A CN201510851061.3A CN201510851061A CN105345388A CN 105345388 A CN105345388 A CN 105345388A CN 201510851061 A CN201510851061 A CN 201510851061A CN 105345388 A CN105345388 A CN 105345388A
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- CN
- China
- Prior art keywords
- pit
- aluminium
- storage tank
- steel
- tank
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
- C23C4/08—Metallic material containing only metal elements
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/18—After-treatment
Abstract
The invention relates to a repair method for a steel storage tank corrosion pit and belongs to the technical field of welding. A pit after repair comprises three parts, including aluminum for filling up the pit, an aluminum-sprayed erosion resistant coating on the inner surface and a carbon fiber sheet back-up coat on the outer surface. In the repair method, the aluminum for filling up the pit plays the roles of smoothing tank wall and facilitating construction of the erosion resistant coating in later period and delaying of tank wall corrosion because the erosion resistant coating is used as a positive pole after corrosion perforation; the aluminum-sprayed erosion resistant coating on the inner surface can isolate direct contact between stored matter and steel of the tank wall and play the roles of delaying or even stopping further erosion and protecting the tank wall; the carbon fiber sheet back-up coat on the outer surface plays the roles of solidifying the tank body and shearing internal pressure so as to prevent discarding of the storage tank caused by the fact that the tank wall is thinned and cannot bear internal pressure. The combined use of the three parts can lastingly and effectively protect and solidify the storage tank.
Description
Technical field
The present invention relates to a kind of method for repairing and mending of steel storage tank corrosion pit, belong to welding technology field.Be applicable to H in storage substance
+the defect mending that contents level is lower, pit corrosion depth is less than the steel storage tank of 1/2 tank wall thickness and tank body are reinforced.
Background technology
Along with the development of national economy, storage tank is widely used in the field such as industrial production and communications and transportation, in the production and storage and transport process of the materials such as oil gas material, fluid chemical material, played very important effect.And As time goes on, at H
2under the acting in conjunction of the materials such as S, steam and air, steel storage tank will be corroded gradually, and the defects such as pit appear in inner surface, and this is by the safe handling of serious threat storage tank and shorten service life of storage tank.Therefore, steel storage tank pit corrosion repairing and reinforcing problem receive increasing concern.
The method mainly Machine Repairing method that present stage steel storage tank pit defect repairing is conventional.The basic thought of Machine Repairing method is exactly the steel plate at excision pit defect position, new steel plate in welding.The method expends more human and material resources and financial resources, and stress may be caused to concentrate when welding new steel plate and new crackle; Meanwhile, Machine Repairing operation of getting angry owned by France, for guaranteeing to cut, welding steel time Mars do not cause accident, costly, and it is longer to repair required time in security protection, and this is difficult to accept the storage tank that again comes into operation for being badly in need of.
In order to solve the repairing problem of Corrosion of Tanks, application number is CN201310729841.1, patent name is a kind of method that method utilizing carbon fiber to repair storage tank proposes a kind of storage tank rust cleaning reinforcing.Foregoing invention patent mainly comprises 6 steps, is followed successively by the first step and carries out rust cleaning reinforcing to the position that tank body corrodes, form back-up coat; Second step plays putty, floating; 3rd step daub, smears carbon cloth special glue; 4th step affixing carbon fabric, determine as required to paste the number of plies, the 5th step plays putty on carbon cloth; 6th step spray-coating surface glue, forming surface glue-line.There is following problem in foregoing invention:
1.pit defect not being filled up, anticorrosion etc. to process, may be still weak link after reinforcing;
2.the carbon fibre cloth layer being directly pasted onto inner surface may react with storage tank institute storage substance and be destroyed, and cannot play the effect of reinforcing;
3.tank surface and carbon cloth are beaten putty and can reduce carbon cloth and tank body, cohesive force between carbon cloth and carbon cloth.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method for repairing and mending of steel storage tank corrosion pit, and it can reduce difficulty of construction and renewal expense while guarantee repairing, consolidation effect.
The technical solution used in the present invention is:
A method for repairing and mending for steel storage tank corrosion pit, comprises the steps:
It forms by filling up three parts such as the aluminium of pit, the aluminium-plated anticorrosive coat of inner surface directly contacted with storage substance and the carbon cloth reinforced layer of outer surface of sharing interior pressure.Being combined of three can be protected more lastingly, more effectively, be reinforced storage tank.
1) cleaning treatment is carried out to position near the pit of steel storage tank and surfaces externally and internally thereof, make it to expose fresh steel;
2) with the aluminium liquid of fusing, pit is filled and led up, aluminium polishing will be protruded after cooling to concordant with periphery tank skin;
3) again clean the aluminium powder near pit, carry out aluminium-plated construction;
4) aluminium-plated complete after, utilize carbon arc to carry out re melting process, utilize the high temperature melt aluminium lamination of carbon arc and tank skin surface steel, make both merge;
5) re melting process carries out sealing pores after completing cooling, first priming, then brush finish paint;
6) on the steel storage tank outer wall corresponding with pit, affixing carbon fabric is as back-up coat;
7) blade coating one deck epoxy mortar again on carbon cloth surface.
In technique scheme, the construction of aluminium-plated anticorrosive coat is carried out after pit fills and leads up polishing and cleaning, and adopt plasma or high speed heat-spraying technology, the aluminium-plated number of plies and thickness are determined according to the corrosivity of institute's storage substance, sprayed-on Al layer thickness should not be less than 250 μm, and the situation that corrosivity is strong takes the circumstances into consideration to thicken.
In technique scheme, after sprayed-on Al layer completes, employing carbon arc carries out re melting process to it, utilizes the high temperature melt aluminium lamination of carbon arc and tank skin surface steel to make both merge.
In technique scheme, re melting process carries out sealing pores after completing cooling, sealing material adopts inorganic zinc coating to make priming paint and epoxide coal bituminous coating makes finish paint, the brushing number of channels of priming paint, finish paint and thickness are determined according to the corrosivity of aluminium lamination spraying effect and institute's storing matter, priming paint, finish paint number of channels are respectively more than 2 roads, and gross thickness should not be less than 200 μm.
In technique scheme, carbon cloth reinforced layer carries out after re melting process cooling, and the fiber of the carbon cloth used is continuous fiber, and is the little bunch fiber of polyacrylonitrile-radical (PAN yl) 12K or below 12K.
In technique scheme, the stickup number of plies of carbon cloth be one or more layers not etc., concrete adhered layer is several to be determined by simple FEM calculation according to interior pressure and tank skin corrosion condition.
In technique scheme, the binding agent of carbon cloth adopts epoxide-resin glue, and after stickup completes need on its surface blade coating one deck epoxy mortar again.
The present invention is applicable to the repairing of steel storage tank corrosion pit and tank body is reinforced.
Principle of the present invention is as follows:
a, fill up the aluminium of pit.Fill up after pit cleaning, and make it to flush with tank skin, play smooth tank skin, facilitate later stage aluminium-plated construction and aluminium-plated anticorrosive coat corrosion failure after to slow down the effect of tank skin corrosion as anode.
b, aluminium-plated anticorrosive coat.Aluminium-plated anticorrosive coat is made up of aluminium matter thin layer and hole sealing coating, and isolated storage substance contacts with the direct of tank skin, plays the effect slowing down and even stop and corrode and further develop.
c, carbon cloth reinforced layer.Back-up coat is bondd by several layers of carbon cloth and forms, and plays and reinforce tank body, shares the effect of the interior pressure of storage tank.
Compared with prior art, the advantage that has of the present invention and effect as follows:
1) without the need to cutting and welding, reducing repairing difficulty, decrease the possibility using naked light, having evaded because welding the risk brought.
2) without the need to cutting and welding, new stress can not be produced and concentrate and crackle, very favourable to the corrosion resistance and service life improving storage tank.
3) carbon cloth intensity is high, and load-carrying properties are excellent, can bear larger load, and be convenient to be cut into various shape, construct simple, convenient.
4) carbon cloth long service life, can completely cut off the erosion of rain water and air to tank wall, extends the service life of storage tank.
Accompanying drawing explanation
Fig. 1 is a kind of schematic diagram of method for repairing and mending of steel storage tank corrosion pit.
In figure: 1-pit fills up aluminium; 2-aluminium-plated anticorrosive coat; 3-carbon cloth reinforced layer; 4-corrosion pit;
5-tank skin; 6-aluminium matter spray-up; 7-zinc-rich coating; 8-epoxide coal bituminous finish paint; 9-carbon cloth; 10-epoxy glue.
Illustrate: I ~ VII is construction order, and wherein I is purge tank wall surface dirt and polishing, and accompanying drawing cannot be indicated, hereby illustrates.
Detailed description of the invention
Describe repair and reinforcement flow process of the present invention in detail below in conjunction with accompanying drawing, but they do not form limitation of the invention, only for example.Simultaneously by illustrating, advantage of the present invention will become clearly and should be readily appreciated that.
As shown in Figure 1, a kind of repairing and tank body of steel storage tank corrosion pit reinforce part, comprising: the aluminium-plated anticorrosive coat of tank inner surface 2 fill up the aluminium 1 of pit, directly contacting with storage substance and the carbon cloth reinforced layer 3 of tank body outer surface sharing interior pressure.
Specific construction process of the present invention is as follows:
1) adopt and scrape or shovel, polish and giant sprays the mode such as diluted acid or dilute alkaline soln and cleans dirt within the scope of tank skin pit and inside and outside surperficial 5 times of pit diameter thereof, make it to expose fresh steel, and use dust blower to spray except the residual water stain and powder stayed of polishing, keep reinforcing portion faces anhydrous dustless (operation I).
2), after pit cleaning, inject pit after utilizing ZP-15-15KW mid-frequency melting furnace (dynamo-electric Co., Ltd of the auspicious nation in Jiangyin produces) that aluminium fusing will be filled up, make it to flush with tank skin, after cooling, if there is the aluminium of protrusion, utilize sanding machine to be polished.(operation II)
3) reuse dust blower spray except dirts such as the aluminium powder within the scope of spray-up, then use the aluminium-plated machine of STR-250-D type (production of Si Teer coating equipment company of Zhangjagang City) to carry out aluminium-plated operation (operation III).
4) aluminium-plated complete after, utilize carbon arc to carry out re melting process (operation IV).
5) sealing pores is carried out, first priming after re melting process cooling, then brush finish paint (operation V).
6) construction (operation VI) carrying out the carbon cloth reinforced layer of tank body outer surface can also be started while carrying out sealing pores.
7) carbon cloth pasted after on its surface blade coating one deck epoxy mortar (operation VII) again.
Claims (4)
1. a method for repairing and mending for steel storage tank corrosion pit, is characterized in that, comprises the steps:
1) remove contamination and grinding process to the pit of steel storage tank and neighbouring position, for being difficult to clean, the position of polishing adopts diluted acid or dilute alkaline soln to clean, and makes it to expose fresh steel;
2) with the aluminium liquid of fusing, pit is filled and led up, aluminium polishing will be protruded after cooling to concordant with periphery tank skin;
3) again clean the aluminium powder near pit, carry out aluminium-plated construction;
4) aluminium-plated complete after, utilize carbon arc to carry out re melting process, utilize the high temperature melt aluminium lamination of carbon arc and tank skin surface steel, make both merge;
5) re melting process carries out sealing pores after completing cooling, first priming, then brush finish paint;
6) on the steel storage tank outer wall corresponding with pit, affixing carbon fabric is as back-up coat;
7) blade coating one deck epoxy mortar again on carbon cloth surface.
2. method for repairing and mending according to claim 1, is characterized in that, in step 3), adopt plasma or high speed heat-spraying technology aluminium-plated.
3. method for repairing and mending according to claim 1, is characterized in that, in step 4), sealing pores adopts inorganic zinc coating to make priming paint and epoxide coal bituminous coating makes finish paint.
4. method for repairing and mending according to claim 1, is characterized in that, in step 6), the fiber of the carbon cloth used is continuous fiber, and is the little bunch fiber of polyacrylonitrile-radical 12K or below 12K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510851061.3A CN105345388A (en) | 2015-11-30 | 2015-11-30 | Repair method for steel storage tank corrosion pit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510851061.3A CN105345388A (en) | 2015-11-30 | 2015-11-30 | Repair method for steel storage tank corrosion pit |
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| Publication Number | Publication Date |
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| CN105345388A true CN105345388A (en) | 2016-02-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510851061.3A Pending CN105345388A (en) | 2015-11-30 | 2015-11-30 | Repair method for steel storage tank corrosion pit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105666338A (en) * | 2016-02-25 | 2016-06-15 | 苏州市永通不锈钢有限公司 | Stainless steel surface treatment process with precise roughness control function |
| CN107138914A (en) * | 2017-04-06 | 2017-09-08 | 马富君 | A kind of restorative procedure of not getting angry of crude oil storage tank |
| CN112893055A (en) * | 2021-02-08 | 2021-06-04 | 新疆八一钢铁股份有限公司 | COREX gas chamber bottom plate anticorrosion treatment method |
| CN113106444A (en) * | 2021-03-22 | 2021-07-13 | 江苏万力机械股份有限公司 | Automobile crankshaft surface flow mark removing treatment method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004237386A (en) * | 2003-02-05 | 2004-08-26 | Sanyo Special Steel Co Ltd | Method of repairing aperture caused by thinning due to corrosive wear occurring in the gap between metallic members |
| CN103074570A (en) * | 2013-01-18 | 2013-05-01 | 大连理工大学 | Treatment process for improving high-temperature, salt and corrosion resisting performance of hot spraying coating |
| CN103706997A (en) * | 2013-12-26 | 2014-04-09 | 孙家成 | Method for repairing storage tank by utilizing carbon fibers |
| CN104534221A (en) * | 2015-01-06 | 2015-04-22 | 北京力强基业工程技术有限公司 | Method for repairing and reinforcing pipeline by means of composite materials |
| CN104741866A (en) * | 2013-12-27 | 2015-07-01 | 博爱县万通机械厂 | Method for repairing casting |
| CN104985386A (en) * | 2015-07-09 | 2015-10-21 | 安徽淮化股份有限公司 | Gas tank leakage repair method |
-
2015
- 2015-11-30 CN CN201510851061.3A patent/CN105345388A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004237386A (en) * | 2003-02-05 | 2004-08-26 | Sanyo Special Steel Co Ltd | Method of repairing aperture caused by thinning due to corrosive wear occurring in the gap between metallic members |
| CN103074570A (en) * | 2013-01-18 | 2013-05-01 | 大连理工大学 | Treatment process for improving high-temperature, salt and corrosion resisting performance of hot spraying coating |
| CN103706997A (en) * | 2013-12-26 | 2014-04-09 | 孙家成 | Method for repairing storage tank by utilizing carbon fibers |
| CN104741866A (en) * | 2013-12-27 | 2015-07-01 | 博爱县万通机械厂 | Method for repairing casting |
| CN104534221A (en) * | 2015-01-06 | 2015-04-22 | 北京力强基业工程技术有限公司 | Method for repairing and reinforcing pipeline by means of composite materials |
| CN104985386A (en) * | 2015-07-09 | 2015-10-21 | 安徽淮化股份有限公司 | Gas tank leakage repair method |
Non-Patent Citations (1)
| Title |
|---|
| 万世清: "《集输工》", 28 February 2013, 中国石化出版社 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105666338A (en) * | 2016-02-25 | 2016-06-15 | 苏州市永通不锈钢有限公司 | Stainless steel surface treatment process with precise roughness control function |
| CN107138914A (en) * | 2017-04-06 | 2017-09-08 | 马富君 | A kind of restorative procedure of not getting angry of crude oil storage tank |
| CN112893055A (en) * | 2021-02-08 | 2021-06-04 | 新疆八一钢铁股份有限公司 | COREX gas chamber bottom plate anticorrosion treatment method |
| CN113106444A (en) * | 2021-03-22 | 2021-07-13 | 江苏万力机械股份有限公司 | Automobile crankshaft surface flow mark removing treatment method |
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Application publication date: 20160224 |