CN103738003A - Composite lining for corrosion prevention of dissolution tank - Google Patents
Composite lining for corrosion prevention of dissolution tank Download PDFInfo
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- CN103738003A CN103738003A CN201310741845.1A CN201310741845A CN103738003A CN 103738003 A CN103738003 A CN 103738003A CN 201310741845 A CN201310741845 A CN 201310741845A CN 103738003 A CN103738003 A CN 103738003A
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Abstract
The invention discloses a composite lining for the corrosion prevention of a dissolution tank. The composite lining is characterized by comprising a metal layer, a closed layer and an acid-proof brick layer, wherein the metal layer, the closed layer and the acid-proof brick layer are sequentially combined on a metal substrate of the dissolution tank, the closed layer is formed by epoxy resin powder and a sheet metal material, and the acid-proof brick layer and the closed layer are connected with each other through an inorganic adhesive layer so as to prevent the infiltration of a corrosive medium. According to the invention, the metal layer can achieve an anode protection effect, or utilizes the excellent corrosion prevention properties of various metal alloys; the closed layer achieves an effect of adhering the inorganic adhesive layer to the metal layer, and also can isolate the metal layer; the acid-proof brick layer further has anticorrosive, isolated and abrasion-resistant effects, so that all the layers are entirely coordinated so as to achieve multiple corrosion prevention functions.
Description
Technical field
The invention belongs to protecting metallic surface technical field, be specifically related to a kind of compound lining for the corrosion protection of stripping tank.
Background technology
It is one of important way of fly ash recovery that flyash acid system extracts aluminium oxide, for carrying out the digester of dissolving with hydrochloric acid flyash reaction, be wherein steel equipment, owing to being subject to hcl corrosion always, rear easy appearance rust of long duration such as wears at the phenomenon, thereby cause the damage of equipment, have a strong impact on production process.Yet the high temperature high voltage resistant characteristic of steel structure material is other material, cannot replace as plastics, thereby under the condition that does not affect steel self character, steel surface be done to preservative treatment research and have very important significance.
The technical research of digester corrosion protective lining is long-standing, the method that mostly adopts coating technology to carry out single corrosion protection to digester metal shell inside in report, as all kinds of coating, metal thermal spraying coating, organic coating layer etc., obtained certain protection effect, yet after long-play due to the wearing and tearing of solid-phase material in digester after corrosion, corrosive medium still can penetrate its external anti-corrosion layer and corrode metal base, is difficult to guarantee the steady and continuous of production.
Summary of the invention
For the deficiencies in the prior art, the object of this invention is to provide a kind of corrosion protection compound lining for stripping tank, there is good antiacid corrosion and wear-resisting effect, to improve the service life of digester.
For achieving the above object, the present invention is by the following technical solutions:
A kind of compound lining for the corrosion protection of stripping tank, it is characterized in that, described compound lining is included in the metallic substrates of described stripping tank metal level, confining bed and the acidproof brick layer of combination successively, described confining bed comprises epoxy powder and flaky metallic material, between described acidproof brick layer and confining bed, by inorganic glue adhensive layer, be connected, to stop that corrosive medium infiltrates.
According to compound lining of the present invention, preferably, described metal level is attached in substrate by thermal spraying, and described confining bed is attached on described metal level by thermal spraying.
According to compound lining of the present invention, preferably, described metal level is the one pack system metal level of aluminium, zinc or magnesium, or is the alloy-layer that at least two kinds of metals in aluminium, zinc and magnesium form;
Or described metal level the serve as reasons superimposed layer that described one pack system metal level and one pack system metal level form, the superimposed layer being formed by described alloy-layer and alloy-layer or the superimposed layer being formed by described one pack system metal level and described alloy-layer.
According to compound lining of the present invention, preferably, described flaky metallic material is the one pack system sheet metal of aluminium, zinc or magnesium, or is the alloy sheet that at least two kinds of metals in aluminium, zinc and magnesium form.
According to compound lining of the present invention, preferably, the mass ratio of described epoxy powder and described flaky metallic material is 2:1-4:1, and the full-size of arbitrary dimension of described flaky metallic material is 8-30 μ m; Further preferably, the mass ratio of described epoxy powder and described flaky metallic material is 2.5:1-3.5:1, and the full-size of arbitrary dimension of described flaky metallic material is 10-20 μ m.
According to compound lining of the present invention, preferably, described inorganic glue adhensive layer is formed by inorganic adhesive, and the liquid phase of described inorganic adhesive is sodium silicate solution or potassium silicate solution, and the solid filling of described inorganic adhesive is alumina powder or SiO 2 powder; Further preferably, the liquid phase of described inorganic glue adhensive layer is sodium silicate solution, and the solid filling of described inorganic glue adhensive layer is alumina powder, and described acidproof brick layer is mullite acidproof brick.
According to compound lining of the present invention, preferably, the metallic substrates of described stripping tank is steel substrate.
According to compound lining of the present invention, preferably, the thickness of described metal level is 50-200 μ m, and the thickness of described confining bed is 40-120 μ m, and the thickness of described inorganic glue adhensive layer is 40-120 μ m; Further preferably, the thickness of described metal level is 80-150 μ m, and the thickness of described confining bed is 50-100 μ m, and the thickness of described inorganic glue adhensive layer is 50-100 μ m.
Compared with prior art, the metal level that meets lining of the present invention can play anodic protection effect or utilize the anticorrosive barrier propterty of excellence of various metal alloys; Confining bed plays the effect of bonding inorganic glue adhensive layer and metal level, can isolate described metal level simultaneously; And that acidproof brick layer further has is anticorrosion, isolation and wear-resisting effect, above-mentioned each layer of overall fitting reaches multiple corrosion protection function.In actual motion, due to the acting in conjunction of high temperature, wearing and tearing and corrosion, can, in the local location generation spot corrosion of acidproof brick layer, form leak source, once slurries flow into, what first can run into is inorganic glue adhensive layer, it has acid resistance and resistance to elevated temperatures, can play the further invasion that hinders pulp solution, if equipment also needs operation to overhaul in time, may allow slurry further corrode and penetrate inorganic glue adhensive layer, contact confining bed, and flaky metallic material in confining bed can be a large amount of consumption slurry in H+, reduce the corrosivity of slurry, while is due to the high warm nature of slurry, can make the epoxy powder in confining bed occur softening, in its softening process, also can be backfilling into the hole eroding away, further stop entering of slurry, after operation for equipment, overhaul the time striven for, and metal level plays last guaranteeing role, once above each layer all leaks and wears, because the maintenance of equipment need to be taked the operation in advance such as cooling and pressure release to equipment, in this process, utilize the principle of electrochemistry anode loss protection, expendable metal layer protection equipment, reduces HTHP and strong acid media and penetrates the probability that steel lining causes leakage to endanger, for its operation provides strong safety guarantee.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of compound lining of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail, but it should be noted that the present invention is not limited in embodiment shown in the drawings.
As shown in Figure 1, the corrosion protection compound lining for stripping tank provided by the present invention is included in the steel substrate 1 of described stripping tank and is combined with successively metal level 2, confining bed 3 and acidproof brick layer 5.
Wherein, described metal level 2 can be prepared in the steel substrate 1 of described stripping tank in several ways, such as plating or thermal spraying etc., consider that thermal spraying fast, flexibly, preferably adopt hot-spraying technique, metal is deposited to a kind of fusing or semi-molten state in the steel substrate 1 of described stripping tank and form metal level 2, described thermal spraying comprises flame-spraying, electric arc spraying and plasma spray coating, these spraying coating process are well known, repeat no more here.
Described metal level 2 can or can be the alloy-layer (as almag, allumen or aluminium zinc magnesium alloy etc.) being comprised of aluminium, zinc and/or magnesium for the one pack system metal level (as aluminium lamination, zinc layer or magnesium layer etc.) of aluminium, zinc or magnesium, or can, for the superimposed layer of multiple one pack system metal level and/or alloy-layer (as first aluminium-plated rear spray zinc, first spray zinc and then aluminium-plated magnesium alloy, can also be first to spray after zinc aluminium-plated aluminium-plated magnesium alloy again etc.), specifically can need to select according to the protection of substrate.When corroding, corrosive medium can first react with described metal level 2.Metal level 2 thickness of the present invention are preferably 50-200 μ m; 80-150 μ m more preferably.
Described confining bed 3 comprises epoxy powder and flaky metallic material (not shown), to stop that corrosive medium infiltrates described metal level 2.Described confining bed 3 is attached on described metal level 2 by thermal spraying mode equally, such as utilizing spray gun that the mixture of epoxy powder and flaky metallic material is sprayed on described metal level 2.The thickness of described confining bed 3 is preferably 40-120 μ m, more preferably 50-100 μ m.
In a preferred embodiment, described flaky metallic material is zinc metal sheet, aluminium flake or magnesium sheet, or is their alloy sheet.During spraying, the powdery paints of melting can be infiltrated up in the space of thermally sprayed coating fast, obtain good sealing effect, and flaky metallic material wherein not only can improve the packing of coating, its larger area can also hinder corrosive liquid and continue dirty, consume acid solution, the corrosivity that makes to be deep into this acid solution declines, simultaneously because pulp solution now has been permeated the distance of a section, once gradient decay of slurry internal corrosion between this distance regions, solution foremost due to continuous consumption reaction, corrosivity is the most weak, if can not get supplementing in time of external factor, corrosion will stop.Wherein, the full-size of arbitrary dimension of described flaky metallic material is preferably 8-30 μ m, and more preferably 10-20 μ m, can be ground and be obtained by machining; The mass ratio of described epoxy powder and described flaky metallic material is preferably 2:1-4:1, more preferably 2.5:1-3.5:1.
Between described acidproof brick layer 5 and confining bed 3, by inorganic glue adhensive layer 4, be connected.Described acidproof brick layer 5 can meet any applicable acidproof brick of GB/T8488-2001 regulation, described inorganic glue adhensive layer is formed by inorganic adhesive, the liquid phase of inorganic adhesive used can be sodium silicate solution or potassium silicate solution, and the solid filling of inorganic glue adhensive layer used is alumina powder or SiO 2 powder.Described inorganic glue adhensive layer 4 thickness are preferably 40-120 μ m, more preferably 50-100 μ m.In a preferred embodiment, the liquid phase of described inorganic adhesive is sodium silicate solution, solid filling is alumina powder, the material of described acidproof brick layer 5 is preferably mullite acidproof brick, the acidproof brick of mullite material can play isolated corrosive medium, Hardening is wear-resisting, the effect of corrosion resistant, by the coefficient of expansion of inorganic gluing and the coupling of compatibility, connects, and realizes the unification of intensity and protection.
Embodiment
1) prepare metal level: as shown in Figure 1, first clear up the steel substrate surface of described stripping lining, particularly, first use acetone washed samples surface, then with 30 order palm fibre corundum, sample is carried out to sandblasting pretreatment, after sandblast completes, the clean compressed air of use is blown away surperficial dust and chip; After for clearance, adopt the spraying of DPT2303 type arc spraying apparatus to the steel substrate surface spraying aluminum metal layer 2 of described stripping lining, the parameter of spraying is: voltage 30V～32V, electric current 140A～160A, air pressure 0.16MPa～0.17MPa, spray gun is vertical with workpiece, and spray distance is 200mm, coating thickness 40-60 μ m.
2) prepare confining bed: the confining bed 3 that the epoxy powder that the spraying of employing DPT2303 type arc spraying apparatus is 3:1 by mass ratio and zinc metal sheet form, the parameter of spraying is: voltage 20V～22V, electric current 100A～120A, air pressure 0.16MPa～0.17MPa, spray gun is vertical with workpiece, and spray distance is 200mm; After having sprayed, at 180 ℃ of baking 10min.
3) prepare acidproof brick layer: the sodium silicate solution that is 30wt% by concentration and alumina powder are the proportional arrangement inorganic adhesive of 3:1 in mass ratio, then smear to described confining bed 3, after smearing, lay rapidly the acidproof brick layer 5 of mullite material, under room temperature, place 24 hours, at 80 ℃, place 2 hours, at 120 ℃, place 2 hours.The thickness of described inorganic glue adhensive layer 4 is 70-90 μ m.
The stripping tank that utilization is prepared with corrosion protection compound lining carries out the molten reaction of flyash acid, through inspection side, and acid pulp solution pH<1.5, solid granulates content is about 270g/L.At 160 ℃ of temperature, after stripping tank work 150h, there is not corroding leakage phenomenon in compound lining, work after 600 hours, the outer surface of tank body is not found penetrability corrosion, carry out internal maintenance and maintenance discovery, there is pitting corrosion in the place, connection gap of part acidproof brick, after dismounting, most of corrosion micropore has only proceeded to inorganic gluing layer or confining bed 3, only a few has proceeded to sprayed metal coating, by pH detection paper, the micro solution pH value >6 in its hole, does not substantially have corrosivity to metal level 2 and threatens.
Claims (10)
1. the compound lining for the corrosion protection of stripping tank, it is characterized in that, described compound lining is included in the metallic substrates of described stripping tank metal level, confining bed and the acidproof brick layer of combination successively, described confining bed comprises epoxy powder and flaky metallic material, between described acidproof brick layer and confining bed, by inorganic glue adhensive layer, be connected, to stop that corrosive medium infiltrates.
2. compound lining according to claim 1, is characterized in that, described metal level is attached in substrate by thermal spraying, and described confining bed is attached on described metal level by thermal spraying.
3. compound lining according to claim 2, is characterized in that, described metal level is the one pack system metal level of aluminium, zinc or magnesium, or is the alloy-layer that at least two kinds of metals in aluminium, zinc and magnesium form;
Or described metal level the serve as reasons superimposed layer that described one pack system metal level and one pack system metal level form, the superimposed layer being formed by described alloy-layer and alloy-layer or the superimposed layer being formed by described one pack system metal level and described alloy-layer.
4. compound lining according to claim 1, is characterized in that, described flaky metallic material is the one pack system sheet metal of aluminium, zinc or magnesium, or is the alloy sheet that at least two kinds of metals in aluminium, zinc and magnesium form.
5. compound lining according to claim 4, is characterized in that, the mass ratio of described epoxy powder and described flaky metallic material is 2:1-4:1, and the full-size of arbitrary dimension of described flaky metallic material is 8-30 μ m.
6. compound lining according to claim 5, is characterized in that, the mass ratio of described epoxy powder and described flaky metallic material is 2.5:1-3.5:1, and the full-size of arbitrary dimension of described flaky metallic material is 10-20 μ m.
7. compound lining according to claim 1, it is characterized in that, described inorganic glue adhensive layer is formed by inorganic adhesive, and the liquid phase of described inorganic adhesive is sodium silicate solution or potassium silicate solution, and the solid filling of described inorganic adhesive is alumina powder or SiO 2 powder.
8. compound lining according to claim 7, is characterized in that, the liquid phase of described inorganic glue adhensive layer is sodium silicate solution, and the solid filling of described inorganic glue adhensive layer is alumina powder, and described acidproof brick layer is mullite acidproof brick.
9. according to the compound lining described in any one in claim 1-8, it is characterized in that, the metallic substrates of described stripping tank is steel substrate.
10. compound lining according to claim 9, is characterized in that, the thickness of described metal level is 50-200 μ m, and the thickness of described confining bed is 40-120 μ m, and the thickness of described inorganic glue adhensive layer is 40-120 μ m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310741845.1A CN103738003B (en) | 2013-12-27 | 2013-12-27 | A kind of compound lining for dissolution tank corrosion protection |
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| CN201310741845.1A CN103738003B (en) | 2013-12-27 | 2013-12-27 | A kind of compound lining for dissolution tank corrosion protection |
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| CN103738003A true CN103738003A (en) | 2014-04-23 |
| CN103738003B CN103738003B (en) | 2016-09-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111575629A (en) * | 2020-05-18 | 2020-08-25 | 神华准能资源综合开发有限公司 | Anti-corrosion composite layer, application and preparation method of anti-corrosion composite lining layer |
| CN114476310A (en) * | 2021-12-24 | 2022-05-13 | 江苏孚日玻璃科技有限公司 | Corrosion-resistant reinforced coating for inner surface of glass bottle |
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| US20040209092A1 (en) * | 2003-04-18 | 2004-10-21 | Near Shannon D. | Laminate material |
| CN101116855A (en) * | 2007-09-04 | 2008-02-06 | 中国船舶重工集团公司第七二五研究所 | Method for preparing corrosion-protection composite coating for the steel metalwork |
| WO2009073196A1 (en) * | 2007-12-04 | 2009-06-11 | United States Pipe And Foundry Company | Anti-corrosive coating for metal surfaces |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040209092A1 (en) * | 2003-04-18 | 2004-10-21 | Near Shannon D. | Laminate material |
| CN101116855A (en) * | 2007-09-04 | 2008-02-06 | 中国船舶重工集团公司第七二五研究所 | Method for preparing corrosion-protection composite coating for the steel metalwork |
| WO2009073196A1 (en) * | 2007-12-04 | 2009-06-11 | United States Pipe And Foundry Company | Anti-corrosive coating for metal surfaces |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111575629A (en) * | 2020-05-18 | 2020-08-25 | 神华准能资源综合开发有限公司 | Anti-corrosion composite layer, application and preparation method of anti-corrosion composite lining layer |
| CN111575629B (en) * | 2020-05-18 | 2022-07-26 | 神华准能资源综合开发有限公司 | Anti-corrosion composite layer, application and preparation method of anti-corrosion composite lining layer |
| CN114476310A (en) * | 2021-12-24 | 2022-05-13 | 江苏孚日玻璃科技有限公司 | Corrosion-resistant reinforced coating for inner surface of glass bottle |
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| CN103738003B (en) | 2016-09-07 |
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