CN102744186B - Method for spraying coating and killing coating on surface of oil tank and for jointly preventing corrosion - Google Patents
Method for spraying coating and killing coating on surface of oil tank and for jointly preventing corrosion Download PDFInfo
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- CN102744186B CN102744186B CN201110100951.2A CN201110100951A CN102744186B CN 102744186 B CN102744186 B CN 102744186B CN 201110100951 A CN201110100951 A CN 201110100951A CN 102744186 B CN102744186 B CN 102744186B
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Abstract
The invention discloses a method for spraying a coating and a killing coating on the surface of an oil tank and for jointly preventing corrosion, wherein a metal corrosion prevention coating is sprayed on the metal surface of an oil tank base body at first; and next, the killing coating taking natural asphalt-improved epoxy resin as a base body, taking polyamide or isocyanate as a cross-linking agent, and taking quaternary ammonium or styrene-acrylic isothiazolinone as a killing agent, is coated on the surface of the sprayed metal coating. According to the method for spraying the coating and the killing coating on the surface of the oil tank and for jointly preventing the corrosion, due to the metal coating and the killing coating, double protections are formed for the inner wall of a tank body; and therefore, the corrosion of microorganism in a water accumulation area on the bottom of the oil tank is prevented; the even corrosion rate and the hole corrosion tendency are effectively decreased; the corrosion prevention performance in a sedimentation water area of the oil tank is excellent; and the service life of the oil tank is prolonged.
Description
Technical field
The invention belongs to metal corrosion and protection technical field, relate to a kind of anti-corrosion method of metallic oil tank, be specifically related to a kind of oil tank surface spraying and the coating of killing livestock associating preserving method.
Background technology
In recent years, peracid, high-sulfur, high-moisture crude oil constantly enter China, have increased the weight of the corrosion in oil tank, make domestic oil tank safety without keeping in repair the production cycle generally only in 3～5 years.Aspect the research of oil tank corrosion and guard technology, there iing larger development at present, influence factor to the corrosion condition of oil tank, corrosion and oil tank corrosion, comprise the impact of microorganism on corrosion in mud at the bottom of oil tank, under corrosive environment, the evaluation method of oil storage tank reliability etc. has all had some achievements in research.Simultaneously; aspect the anti-corrosion measure of oil tank, researcher and engineers and technicians are also to various cathodic protection materials, as Zn, Mg, Al etc. both at home and abroad; and the effect of different corrosion inhibiter in oil tank is anticorrosion test and study, corresponding anti-corrosion measure has been proposed.Although above-mentioned research and technical measures are comparatively comprehensively with careful; but the aseptic technic proposing is confined to the cathode protection measure of the metals such as the selection of corrosion inhibiter and zinc, magnesium substantially; and the rarely seen report of choice and application of coating that metallic aluminium sprayed coating is killed livestock in the antisepsis in oil tank deposition pool and oil tank connate water has no report to metal spraying and the combined measures of the coating of killing livestock.
Along with imported crude oil constantly enters China, particularly in the imported crude oil of the Middle East, sulfur content is high, and the decay resistance of domestic petrochemical industry, chemical industry equipment has been proposed to more and more higher requirement.Strengthening the research of petrochemical industry oil product storage tank corrosion mechanism, develop anticorrosion new technology and new technology cheap, high-efficient and lasting, improve the service life of oil product storage tank, is whole petrochemical industry problem demanding prompt solution.This work not only can improve the equipment Management Level of industrial enterprise, and to reducing checking maintenance expense, saves material and the energy, reduces environmental pollution, creates leakproof plant all significant.
Summary of the invention
The object of the present invention is to provide a kind of oil tank surface spraying and the coating of killing livestock associating preserving method; for oil tank bottom, accumulate the corrosive mediums such as water; tank body is adopted to cathodic protection coatings and biocide coating associating protective treatment; stop oil tank bottom and accumulate the microbiologic(al) corrosion in pool; can effectively reduce uniform corrosion rate and pitting tendency; improve antiseptic property, extend oil tank service life.
The technical solution used in the present invention is as follows:
A kind of oil tank surface spraying and the coating of killing livestock associating preserving method, it is characterized in that first at oil tank base metal surface spray metal corrosion-inhibiting coating, again on sprayed metal coating surface coated with the epoxy resin of bitumen modification as matrix, using polyamide or isocyanates as crosslinking agent, and quaternary amine, phenylpropyl alcohol OIT or its mixture are as the coating of killing livestock of biocide.
Anti-corrosive metal coating in the spraying of oil tank base metal surface; can play to parent metal the effect of cathodic protection; on sprayed metal coating surface, apply the coating of killing livestock simultaneously; can avoid the microorganism growing in oil tank connate water; if sulfur bacteria, iron bacteria and saprophytic bacteria etc. are to the microbiologic(al) corrosion that metal produced, further improve the life-span of sprayed coating.
Described anti-corrosive metal coating is metallic zinc, aluminium or their alloy, or the composite coating of zinc, aluminium or their alloy and nonmetal (as glass flake).
The spraying method of described anti-corrosive metal coating comprises the steps:
(1) clean
Adopt temperature >=70 ℃, pressure >=12MPa to add greasy dirt in the water purge tank of washing agent.
(2) mend pit
After being adopted to overlaying method reparation, existing pit at the bottom of tank skin and tank polishes to flat.
(3) derusting by sandblasting
Adopt blasting method to carry out processing of rust removing to tank skin and tank basal surface.
(4) metal spraying belongs to
Adopt electric arc spraying equipment, carry out the spraying of tank body, tank basal surface.
Described anti-corrosive metal coating coating thickness >=120 μ m, the adhesive force >=5MPa of metal level and mother metal.
The present invention applies the coating of killing livestock and seals processing on the basis of metal spraying, can effectively prevent microorganism in bottom settlings water, comprise the adhering on tank body such as sulfur bacteria, iron bacteria and saprophytic bacteria, the microbiologic(al) corrosion that reduces to cause therefrom and underdeposit corrosion, further improve the decay resistance of material.
The described coating of killing livestock selects the epoxy resin of bitumen modification as matrix, usings polyamide or isocyanates as crosslinking agent, quaternary amine or phenylpropyl alcohol OIT, or their mixture is as biocide.Before coating, the epoxy resin of equivalent quality is mixed with polyamide or isocyanates, and add quaternary amine, phenylpropyl alcohol OIT or their mixture of 1-15ppm, after mixing, at the bottom of adopting manual method to be coated on inner tank wall or tank.
Coat thickness >=150 μ the m of the described coating of killing livestock, and complete after within 24 hours, having solidified and need to carry out maintenance the examination that conducts a survey in coating.
The preferred dodecyl benzyl dimethyl ammonium chloride of described quaternary amine, phenylpropyl alcohol OIT preferably 1,2-phenylpropyl alcohol isothiazoline-3-ketone.
No matter have or not antimicrobial coating, the corrosion-inhibiting coating of aluminium-plated and aluminium-plated+glass flake all can effectively reduce the homogeneous corrosion of oil tank parent metal material, but the method for existing metal surface spraying does not relate to microbiologic(al) corrosion and respective handling means.Although antimicrobial coating itself also can play the effect that reduces material corrosion speed, its protection degree is relatively low, if adopted together with other means of antimicrobial coating and surface spraying, can obtain suitable effect.The inventive method forms the duplicate protection to tank body by metal coating and antimicrobial coating, and the coating of antimicrobial coating has further improved the decay resistance of material, excellent at oil tank connate water region antiseptic property.
The present invention can be applicable to the inner surface preservative treatment of the various carbon steels of the flow industry enterprise oil product storage tanks processed such as oil, petrochemical industry, chemical industry, prevent the homogeneous corrosion and the spot corrosion that by chlorion, sulphion, sulfate ion etc., are caused, and can effectively prevent microorganism in bottom settlings water, comprise the adhering on tank body such as sulfur bacteria, iron bacteria and saprophytic bacteria, the microbiologic(al) corrosion that reduces to cause therefrom and underdeposit corrosion.
The inventive method pin be take oil tank bottom and is accumulated water as corrosive medium, and carbon steel tank body is adopted to cathodic protection coatings and biocide coating associating protective treatment, stops the microbiologic(al) corrosion that oil tank bottom accumulates pool, effectively reduces uniform corrosion rate and pitting tendency.The inventive method forms the duplicate protection to inner tank wall by metal coating and antimicrobial coating; excellent at oil tank connate water region antiseptic property; long service life; can be enterprise and save a large amount of human, financial and material resources, the approach of a research and exploration is also provided for the solution of Process Equipment corrosion failure problem under the similar environmental condition of petrochemical industry simultaneously.Both there is theory significance, there is again great social and economic benefits.
In order better to illustrate, be further described content of the present invention below by specific embodiment.Protection scope of the present invention is limited by claims.
Accompanying drawing explanation
Sheet outward appearance is interviewed in the blank test piece of Fig. 1 down.
Sheet outward appearance is interviewed in the blank test piece of Fig. 2 upward.
After the aluminium-plated corrosion-inhibiting coating of Fig. 3, apply antimicrobial coating test piece outward appearance.
Fig. 4 aluminium-plated with glass flake composite coating after apply antimicrobial coating test piece outward appearance.
The specific embodiment
Adopt the inventive method to carry out preservative treatment to oil tank body inwall, the cathodic protection metal coating in tank inner surface spraying aluminium or aluminium and glass flake formation, forms cathodic protection to tank body metal; On anti-corrosive metal coating, be coated with the antimicrobial coating of killing livestock that modified epoxy and biocide form, prevent the formed microbiologic(al) corrosion of all kinds of bacterial depositions of bottom settlings aqua region.
Concrete grammar comprises the steps:
1, metal spraying technique
(1) clean
Adopt temperature >=70 ℃, pressure >=12MPa to add greasy dirt in the water purge tank of washing agent.
(2) mend pit
To existing pit at the bottom of tank skin and tank, especially larger-size pit is with polishing after overlaying method reparation to flat.
(3) derusting by sandblasting
Adopt blasting method to carry out processing of rust removing to tank skin and tank basal surface, cleannes reach ISO8501-1 Sa3, and roughness reaches 3 grades of ISO8503-1.
The object of this operation is that sprayed surface is carried out to oil removing, rust cleaning and degreasing.The compressed air system that need to jointly be comprised of oil free screw compressor, freeze drier and buffering air accumulator provides clean compressed air, selects automatically to enter sand blasting machine simultaneously and carries out sandblast operation.
(4) metal spraying belongs to
Adopt electric arc spraying equipment, in the compressed air system jointly being formed by oil free screw compressor, freeze drier and buffering air accumulator, provide under the compressed-air actuated condition of cleaning, carry out the spraying of tank body, tank basal surface.Operative norm is ISO2063, coating thickness >=120 μ m, the adhesive force >=5MPa of institute's metal layer spraying and collective's mother metal.
2, kill livestock coating sealing is processed
Select the epoxy resin of bitumen modification as matrix, using polyamide or isocyanates as crosslinking agent, dodecyl benzyl dimethyl ammonium chloride, 1,2-phenylpropyl alcohol isothiazoline-3-ketone or its mixture are as biocide.Before coating, the epoxy resin of equivalent is mixed with polyamide or isocyanates, and add 1-15ppm dodecyl benzyl dimethyl ammonium chloride, 1, after 2-phenylpropyl alcohol isothiazoline-3-ketone or its mixture, mix, at the bottom of adopting manual method to be coated on inner tank wall or tank.Operative norm is ISO12944/C4, coat thickness >=150 μ m, and complete after within 24 hours, having solidified and need to carry out maintenance the examination that conducts a survey in coating.
From 26 days to 2010 May in 2009 by the end of February, in the slop tank of Mou aromatic hydrocarbons factory storing workshop, carried out hanging film scene test.After test lacing film takes out, adopt weight-loss method to evaluate the impact of different anti-corrosion measures on A3 steel homogeneous corrosion situation.
The general weight-loss ratio of lacing film that adopts is described the effect that different anti-corrosion measures prevent homogeneous corrosion.The weight-loss ratio of oil tank inner product water zonal corrosion lacing film is as shown in table 1 below.
Table 1 hanging test result
As seen from the above table, no matter have or not antimicrobial coating, the corrosion-inhibiting coating of aluminium-plated and aluminium-plated+glass flake all can effectively reduce the homogeneous corrosion of material.In addition, although antimicrobial coating itself also can play the effect that reduces material corrosion speed, its protection degree is relatively low, if but together with other means of antimicrobial coating and surface spraying, adopt, desirable must beyond thought effect.As shown above, only spray aluminium+glass flake, during without antimicrobial coating, the protection degree of corrosion-inhibiting coating is 83.9%, once but apply after antimicrobial coating, the protection degree of its coating is up to 95.7%.Therefore,, from the angle of homogeneous corrosion weight-loss ratio, proved the validity of cathode of composite material protective finish and prevented the importance that microbiologic(al) corrosion is accumulated aqua region carbon steel material corrosion condition for minimizing oil tank.
In hanging test, the corrosion condition that blank test piece occurs as depicted in figs. 1 and 2.As seen from the figure, blank test piece down one side there is no and be subject to noticeable local corrosion, interviews sheet local corrosion upward comparatively obvious, and existing spot corrosion also has pitting corrosion and underdeposit corrosion, and wherein spot corrosion density is 6/cm
2, depth capacity is about 0.012mm.
Fig. 3 and Fig. 4 are respectively the test piece that applies antimicrobial coating after aluminium-plated rear coating antimicrobial coating and aluminium-plated+glass flake composite coating and in accumulating water, soak the situation after 8 months.Wherein the black on test piece surface is partly not due to local corrosion, but because leave a small amount of imprecision sealing at test piece edge while applying antimicrobial coating, makes to accumulate water and infiltrates and form under coating, and obviously test piece surface is without visible local corrosion situation.The coating of antimicrobial coating has improved the resistance to local corrosion performance of material.
Claims (4)
1. an oil tank surface spraying and the coating of killing livestock associating preserving method, it is characterized in that first at oil tank base metal surface spray metal corrosion-inhibiting coating, again on sprayed metal coating surface coated with the epoxy resin of bitumen modification as matrix, using polyamide or isocyanates as crosslinking agent, and quaternary ammonium salt, phenylpropyl alcohol OIT or its mixture are as the coating of killing livestock of biocide;
Described anti-corrosive metal coating coating thickness >=120 μ m, the adhesive force >=5MPa of metal level and mother metal; The spraying method of anti-corrosive metal coating comprises the steps:
(1) clean: adopt temperature >=70 ℃, pressure >=12MPa to add greasy dirt in the water purge tank of washing agent;
(2) mend pit: after existing pit at the bottom of tank skin and tank is adopted to overlaying method reparation, polish to flat;
(3) derusting by sandblasting: adopt blasting method to carry out processing of rust removing to tank skin and tank basal surface;
(4) metal spraying: adopt electric arc spraying equipment, carry out the spraying of tank body, tank basal surface;
The described coating of killing livestock is that the epoxy resin of equivalent mixes with polyamide or isocyanates, and adds quaternary ammonium salt, phenylpropyl alcohol OIT or its mixture of 1-15ppm; Coat thickness >=150 μ the m of the coating of killing livestock.
2. oil tank surface spraying according to claim 1 and the coating of killing livestock associating preserving method, is characterized in that: described anti-corrosive metal coating is metallic zinc, aluminium or their alloy, or zinc, aluminium or their alloy and nonmetallic composite coating.
3. oil tank surface spraying according to claim 2 and the coating of killing livestock associating preserving method, is characterized in that: described anti-corrosive metal coating is the composite coating of aluminium and glass flake.
4. oil tank surface spraying according to claim 1 and the coating of killing livestock associating preserving method, is characterized in that: described quaternary ammonium salt is dodecyl benzyl dimethyl ammonium chloride, and phenylpropyl alcohol OIT is 1,2-phenylpropyl alcohol isothiazoline-3-ketone.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110100951.2A CN102744186B (en) | 2011-04-22 | 2011-04-22 | Method for spraying coating and killing coating on surface of oil tank and for jointly preventing corrosion |
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| CN201110100951.2A CN102744186B (en) | 2011-04-22 | 2011-04-22 | Method for spraying coating and killing coating on surface of oil tank and for jointly preventing corrosion |
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| CN102744186B true CN102744186B (en) | 2014-04-02 |
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| CN104069995B (en) * | 2014-06-27 | 2016-03-16 | 贵州开磷集团股份有限公司 | A kind of means of defence for the system equipment that is corroded in sulphur fusion process |
| BR112018013275A2 (en) | 2015-12-31 | 2018-12-11 | Henkel Ag & Co Kgaa | self-priming coatings |
| CN105521680A (en) * | 2016-02-02 | 2016-04-27 | 中南大学 | Desulphurization and dust removal integrated wet type flue gas purification device and method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1324958A (en) * | 2000-05-18 | 2001-12-05 | 中国科学院海洋研究所 | Anticorrosion method of marine steel |
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| JP4132133B2 (en) * | 1997-06-20 | 2008-08-13 | 三井化学産資株式会社 | Waterproofing and anticorrosion coating methods and methods for forming painted objects |
| JP2002001203A (en) * | 2000-06-21 | 2002-01-08 | Nippon Paint Co Ltd | Method for forming double-layer coating film and double-layer coating film |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1324958A (en) * | 2000-05-18 | 2001-12-05 | 中国科学院海洋研究所 | Anticorrosion method of marine steel |
Non-Patent Citations (4)
| Title |
|---|
| "金属油罐腐蚀与综合防护";王治群;《辽宁化工》;20070731;第36卷(第7期);第498~500页 * |
| JP特开2002-1203A 2002.01.08 |
| JP特开平11-10066A 1999.01.19 |
| 王治群."金属油罐腐蚀与综合防护".《辽宁化工》.2007,第36卷(第7期),第498~500页. |
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