CN104928617A - Laser remelting method for steel electric arc spraying aluminum coating layer used for ocean platform - Google Patents
Laser remelting method for steel electric arc spraying aluminum coating layer used for ocean platform Download PDFInfo
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- CN104928617A CN104928617A CN201510393588.6A CN201510393588A CN104928617A CN 104928617 A CN104928617 A CN 104928617A CN 201510393588 A CN201510393588 A CN 201510393588A CN 104928617 A CN104928617 A CN 104928617A
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- coating
- substrate surface
- coating layer
- aluminum
- arc spraying
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 37
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 20
- 239000010959 steel Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000005507 spraying Methods 0.000 title claims abstract description 16
- 238000010891 electric arc Methods 0.000 title claims abstract description 10
- 239000011247 coating layer Substances 0.000 title abstract 10
- 239000000758 substrate Substances 0.000 claims abstract description 24
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 229910052742 iron Inorganic materials 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims description 46
- 239000011248 coating agent Substances 0.000 claims description 39
- 239000007921 spray Substances 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 8
- 239000004411 aluminium Substances 0.000 claims description 7
- 239000011159 matrix material Substances 0.000 claims description 7
- 238000005488 sandblasting Methods 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 238000004372 laser cladding Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 229910001018 Cast iron Inorganic materials 0.000 claims description 2
- 244000137852 Petrea volubilis Species 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000003749 cleanliness Effects 0.000 claims description 2
- 238000005238 degreasing Methods 0.000 claims description 2
- 239000004519 grease Substances 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 abstract description 21
- 230000007797 corrosion Effects 0.000 abstract description 20
- 238000005516 engineering process Methods 0.000 abstract description 6
- 239000013535 sea water Substances 0.000 abstract description 4
- 238000012986 modification Methods 0.000 abstract description 3
- 230000004048 modification Effects 0.000 abstract description 3
- 229910045601 alloy Inorganic materials 0.000 abstract description 2
- 239000000956 alloy Substances 0.000 abstract description 2
- 239000002131 composite material Substances 0.000 abstract description 2
- 239000010410 layer Substances 0.000 abstract 2
- 150000003839 salts Chemical class 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 238000012876 topography Methods 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000003245 working effect Effects 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004626 scanning electron microscopy Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
Abstract
The invention relates to the technical field of steel surface modification processing, in particular to a laser remelting method for a steel electric arc spraying aluminum coating layer used for an ocean platform, in order to solve the problem that the seawater corrosion resistant capacity of the coating layer is improved without increasing the thickness of the coating layer, and belongs to a material surface modification composite processing technology. By means of a electric arc spraying technology, a layer of the aluminum coating layer is prepared by using the surface of a steel base material on the ocean platform, then a laser remelting technology is used to iron melt the aluminum coating layer and the surface of a substrate, and after cooling is conducted, a Fe-Al alloy layer is formed; the surface of the coating layer is flat, the structure property can be improved, alloy combination is formed between the coating layer and the base material, a few amorphous state aluminum is generated in the coating layer, and the corrosion resistant performance of the coating layer can be improved.
Description
Technical field
The present invention relates to offshore platform steel surface modification technologies field, refer in particular to the laser remolten method of a kind of offshore platform steel surface arcing spraying aluminum coating, for solving the problem not improving the anti-sea-water corrosion ability of coating by increasing coat-thickness, belong to material surface modifying composite treatment technology.
Background technology
Ocean platform is mainly used in marine oil, gas extraction work, because oil-gas mining region is constantly to deep-sea regional development, ocean platform will be subject to the corrosion of the physical-chemical such as more severe typhoon, wave, tide and salt fog, ionogen, marine microorganism; Especially in wave splash zone, the erosion rate of steel is under normal circumstances 6 times, the a small amount of breakage in spud leg steel surface can cause the generation of closed battery, will accelerate its erosion rate, and the protection against corrosion time limit of the application of mobile ocean platform to ocean platform also been proposed new requirement; Arc spraying aluminium is a kind of long-acting metal surface anticorrosive technique, 200 μm of thick aluminum coatings in the seawater theoretical service life are 30 years, in salt fog and the stronger Tidal zone environment of seawater erosion, its work-ing life obviously declines, and extends the mechanical property that will have influence on its load carrier work-ing life of ocean platform simply by increase coat-thickness; Along with the increase of coating thickness, in coating, the spraying such as space, hole defect can significantly increase; Secondly, the combination of aluminum coating and ground is that a small amount of metallurgical binding and a large amount of mechanical bond coexist, and the increase of coat-thickness can cause coating to occur that entirety is peeled off.
Patent of the present invention prepares one deck aluminum coating by electric arc spraying process at offshore platform steel substrate surface, by Laser Cladding, aluminum coating and substrate surface iron are melted again, Fe-Al alloy layer is formed after cooling, coatingsurface is smooth, structure property is improved, coating and matrix are formed in metallurgical binding, coating and occur a small amount of amorphous aluminum, and the Corrosion Protection of coating gets a promotion height.
Summary of the invention
Patent of the present invention adopts electric arc spraying-laser remolten recombining process to the process of offshore platform steel modifying surface, by the series of physical that occurs between Fe element and Al element, chemical reaction steel surface prepare a layer thickness evenly, combines well, the alloy coat of excellent anti-corrosion performance; Can under the condition not increasing coat-thickness; increase the service life of coating; thus reduce coating wt to the impact of ocean platform mechanical property; do not need coating and matrix just to be made to be formed by heat diffusion treatment technique to combine closely; reach Simplified flowsheet; the object reduced costs, can make ocean platform obtain long-acting protection.
Concrete steps of the present invention are as follows: the preparation method of surface coating of offshore platform steel arc spraying aluminium-laser remolten, is characterized in that, first carries out mechanical grinding to substrate surface, and chemical liquids cleaning arrives Sa3 level degree of cleaning, sandblasting; With industrial Ф 2mm aluminium wire for raw material, guarantee its purity > 99.5%, utilize the heat energy of electric arc that aluminium wire is heated to molten state, its operating voltage is 20-32V, electric current is 150-300A, with the high pressure draft of 0.5-0.6Mpa for power, molten aluminum is sprayed onto substrate surface, the translational speed of guarantee spray gun is 300-400mm/s, spray distance is 5-8mm, sprayed rear cooling 80min-100min, substrate surface is covered aluminum coating that a layer thickness is 200-250 μm, coating and matrix form good mechanical bond and a small amount of metallurgical binding; Finally carry out laser remolten art breading; laser power is 1000-1200W; spot diameter is 3-4mm; sweep velocity is 6-8mm/s; and be filled with argon gas as protection gas, to guarantee that whole aluminum coating and substrate surface thickness 30-50 μm of place can both enter molten state, fully react; form the Fe-Al alloy layer that thickness is 100-150 μm, make matrix become as a whole with coating.
Accompanying drawing explanation
Fig. 1 is the surface topography comparison diagram before and after the present invention is corroded; After (a) virgin state (b) corrosion.
Fig. 2 is the interface topography comparison diagram before and after the present invention is corroded; After (a) virgin state (b) corrosion.
Fig. 3 is the XRD comparison diagram before and after the present invention is corroded; After (a) virgin state (b) corrosion.
Embodiment
(1) 180 are used
#-1000
#sand paper is polished to substrate surface, and with washes of absolute alcohol, acetone degreasing, to remove specimen surface grease and foreign material, guarantees that substrate surface cleanliness reaches Sa3 level.
(2) use particle diameter for 1mm cast iron shot be abrasive particle, compressed air pressure > 0.8MPa, sandblasting distance be 200mm, sandblasting angle is 20 °, make smart rugosity arrival RZ60 μm.
(3) with industrial Ф 2mm aluminium wire for raw material, guarantee its purity > 99.5%, utilize the heat energy of electric arc that aluminium wire is heated to molten state, its operating voltage is 20-32V, electric current is 150-300A, with the high pressure draft of 0.5-0.6Mpa for power, molten aluminum is sprayed onto substrate surface, the translational speed of guarantee spray gun is 300-400mm/s, spray distance is 5-8mm, spray rear cooling 80min-100min, substrate surface is covered aluminum coating that a layer thickness is 200-250 μm, coating and matrix form good mechanical bond and a small amount of metallurgical binding.
(4) finally laser remolten art breading is carried out; laser power is 1000-1200W; spot diameter is 3-4mm; sweep velocity is 6-8mm/s; and be filled with argon gas as protection gas; to guarantee that whole aluminum coating and substrate surface thickness 30-50 μm of place can both enter molten state, fully react, form the Fe-Al alloy layer that thickness is 100-150 μm.
(5) verified the Corrosion Protection of this coating by salt spray corrosion test, adopt concentration to be the NaCl solution of 5%, spray pressure is 0.1MPa, and test temperature is 35 ± 2 DEG C.
(6) by SEM and XRD analysis Fe-Al alloy layer salt air corrosion front and rear surfaces-interface topography, chemical element composition, the Corrosion Protection of layer is observed.As shown in Fig. 1 (a), (b), corrosion Front-coating mirror surface is comparatively smooth, and the rear coating of corrosion in the form of sheets entirety is peeled off, and does not occur local corrosion; As shown in Fig. 2 (a), (b), before and after corrosion only there is minimum change in coating on thickness, and coating-substrate bonding properties is excellent; As shown in Fig. 3 (a), (b), corrosion Front-coating mirror is based on Fe-Al alloy, and after corrosion, coating is with Al
2o
3oxide film is main, and Corrosion Protection gets a promotion.
Claims (5)
1. the laser remolten method of an offshore platform steel arc spraying aluminum coatings, it is characterized in that: prepare one deck aluminum coating by electric arc spraying process at offshore platform steel substrate surface, by Laser Cladding, aluminum coating and substrate surface iron are melted again, Fe-Al alloy layer is formed after cooling, make base material become as a whole with coating, improve the non-corrosibility of coating.
2. the laser remolten method of a kind of offshore platform steel arc spraying aluminum coatings as claimed in claim 1, it is characterized in that described prepare one deck aluminum coating by electric arc spraying process at offshore platform steel substrate surface and referring to: first carry out mechanical grinding to substrate surface, chemical liquids cleaning arrives Sa3 level degree of cleaning, sandblasting; With industrial Ф 2mm aluminium wire for raw material, guarantee its purity > 99.5%, utilize the heat energy of electric arc that aluminium wire is heated to molten state, its operating voltage is 20-32V, electric current is 150-300A, with the high pressure draft of 0.5-0.6Mpa for power, molten aluminum is sprayed onto substrate surface, the translational speed of guarantee spray gun is 300-400mm/s, spray distance is 5-8mm, sprayed rear cooling 80min-100min, substrate surface is covered aluminum coating that a layer thickness is 200-250 μm, coating and matrix form good mechanical bond and a small amount of metallurgical binding.
3. the laser remolten method of a kind of offshore platform steel arc spraying aluminum coatings as claimed in claim 1, it is characterized in that described aluminum coating and substrate surface iron being melted by Laser Cladding again, Fe-Al alloy layer is formed after cooling, base material is made to become as a whole finger with coating: laser power is 1000-1200W, spot diameter is 3-4mm, sweep velocity is 6-8mm/s, and be filled with argon gas as protection gas, to guarantee that whole aluminum coating and substrate surface thickness 30-50 μm of place can both enter molten state, abundant reaction, form the Fe-Al alloy layer that thickness is 100-150 μm, matrix is made to become as a whole with coating.
4. the laser remolten method of a kind of offshore platform steel arc spraying aluminum coatings as claimed in claim 2, its
Be characterised in that: first described carries out mechanical grinding to substrate surface, chemical liquids cleaning arrives Sa3 level degree of cleaning and refers to: use 180
#-1000
#sand paper is polished to substrate surface, and with washes of absolute alcohol, acetone degreasing, to remove specimen surface grease and foreign material, guarantees that substrate surface cleanliness reaches Sa3 level.
5. the laser remolten method of a kind of offshore platform steel arc spraying aluminum coatings as claimed in claim 2, its
Be characterised in that described sandblasting refers to: use particle diameter for 1mm cast iron shot be abrasive particle, compressed air pressure > 0.8MPa, sandblasting distance be 200mm, sandblasting angle is 20 °, make smart rugosity arrival RZ60 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510393588.6A CN104928617B (en) | 2015-07-08 | 2015-07-08 | A kind of laser remolten method of offshore platform steel arc spraying aluminum coatings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510393588.6A CN104928617B (en) | 2015-07-08 | 2015-07-08 | A kind of laser remolten method of offshore platform steel arc spraying aluminum coatings |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104928617A true CN104928617A (en) | 2015-09-23 |
| CN104928617B CN104928617B (en) | 2017-10-20 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510393588.6A Active CN104928617B (en) | 2015-07-08 | 2015-07-08 | A kind of laser remolten method of offshore platform steel arc spraying aluminum coatings |
Country Status (1)
| Country | Link |
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| CN (1) | CN104928617B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106399897A (en) * | 2016-09-22 | 2017-02-15 | 常州大学 | Method and device for preparing amorphous aluminum coating by means of laser thermal spraying |
| CN109023210A (en) * | 2018-08-10 | 2018-12-18 | 天津德天助非晶纳米科技有限公司 | The preparation method of cast iron alitizing coating |
| CN109112461A (en) * | 2018-09-30 | 2019-01-01 | 常州大学 | A kind of method that laser two-step method prepares aluminium-based amorphous alloy composite ceramic coat in ocean platform steel surface |
| CN109440049A (en) * | 2017-11-27 | 2019-03-08 | 常州大学 | A kind of electric arc spraying and the compound method for preparing amorphous aluminized coating of laser remolten |
| CN110643922A (en) * | 2019-10-24 | 2020-01-03 | 广东石油化工学院 | Surface modification method of twin-wire arc spraying and laser remelting |
| CN111004992A (en) * | 2019-12-13 | 2020-04-14 | 西安交通大学 | Process for in-situ synthesis of Fe-Al coating through laser remelting |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106399897A (en) * | 2016-09-22 | 2017-02-15 | 常州大学 | Method and device for preparing amorphous aluminum coating by means of laser thermal spraying |
| CN109440049A (en) * | 2017-11-27 | 2019-03-08 | 常州大学 | A kind of electric arc spraying and the compound method for preparing amorphous aluminized coating of laser remolten |
| CN109023210A (en) * | 2018-08-10 | 2018-12-18 | 天津德天助非晶纳米科技有限公司 | The preparation method of cast iron alitizing coating |
| CN109112461A (en) * | 2018-09-30 | 2019-01-01 | 常州大学 | A kind of method that laser two-step method prepares aluminium-based amorphous alloy composite ceramic coat in ocean platform steel surface |
| CN109112461B (en) * | 2018-09-30 | 2020-10-09 | 常州大学 | Method for preparing aluminum-based amorphous composite ceramic coating on surface of ocean platform steel by laser two-step method |
| CN110643922A (en) * | 2019-10-24 | 2020-01-03 | 广东石油化工学院 | Surface modification method of twin-wire arc spraying and laser remelting |
| CN111004992A (en) * | 2019-12-13 | 2020-04-14 | 西安交通大学 | Process for in-situ synthesis of Fe-Al coating through laser remelting |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104928617B (en) | 2017-10-20 |
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