CN104018108A - Steel surface modification treatment method for ocean platform - Google Patents
Steel surface modification treatment method for ocean platform Download PDFInfo
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- CN104018108A CN104018108A CN201410291642.1A CN201410291642A CN104018108A CN 104018108 A CN104018108 A CN 104018108A CN 201410291642 A CN201410291642 A CN 201410291642A CN 104018108 A CN104018108 A CN 104018108A
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- oxide film
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Abstract
The invention relates to the technical field of steel surface treatment for ocean platforms, particularly a steel surface modification treatment method for an ocean platform. The method uses steel S355 for ocean platforms as a substrate, and is characterized by comprising the following steps: carrying out surface cleaning treatment, grit blasting and surface coarsening treatment on the S355; carrying out arc spraying to form a Fe-Al alloy layer on the S355 surface; carrying out surface polishing treatment on the formed sprayed aluminum layer, and carrying out anodic oxidation to generate an Al2O3 oxide film on the surface of the sprayed aluminum layer; and finally, carrying out hole sealing treatment on the Al2O3 oxide film by using the ceramic coating paint. The composite technique can use low energy consumption to obtain the more compact lower-porosity protective layer, and greatly enhances the corrosion resistance of the substrate S355.
Description
Technical field
The present invention relates to offshore platform steel technical field of surface, refer in particular to a kind of method of offshore platform steel surface modification treatment.Utilize the recombining process of a kind of arc spraying aluminum coatings+anodic oxidation+ceramic coating coating sealing of hole on offshore platform steel S355, to carry out surface treatment, generate fine and close oxide film, the corrosion resistance nature that improves offshore platform steel, belongs to material surface modifying process field.
Background technology
Ocean is around storing the abundant resources such as oil and gas, and along with the mankind are to the continually developing of ocean, Offshore Platform has obtained developing rapidly; A series of features such as ocean platform has working conditions that lotus carves, requires strict safe reliability, long service life, maintenance are more difficult, have therefore proposed very high requirement to the performance of offshore platform steel; S355 is one of most widely used steel type during current ocean platform is built, and because be on active service bad border is severe, not only requires S355 to have higher intensity, plasticity and good toughness, also requires it to have stronger corrosion resistance simultaneously; For improving the work-ing life of offshore platform steel S355, by electric arc spraying at S355 Surface Creation one deck Fe-Al alloy layer, this method has improved the features such as the solidity to corrosion of S355 and high temperature oxidation resistance, and do not destroy the whole mechanical property of matrix, yet sprayed-on Al layer is in long-time use procedure, because air and corrosive medium can intrude into matrix steel surface by sprayed-on Al layer hole and crackle, thereby etched the matrix causes the peeling phenomenon of sprayed-on Al layer; Patent exploitation of the present invention, for the surperficial method for anti-corrosion treatment of the offshore platform steel S355 under severe environment that is on active service, has solved the defect of above-mentioned sprayed-on Al layer, can further improve the corrosion resistance nature of offshore platform steel S355.
Summary of the invention
The object of the present invention is to provide the recombining process of a kind of arc spraying aluminum coatings+anodic oxidation+ceramic coating coating sealing of hole to improve the corrosion resistance nature of offshore platform steel S355, adopt the method at S355 Surface Creation one deck Al
2o
3protective layer, has eliminated crackle and the hole on electric arc aluminium spraying layer surface, has further improved the corrosion resistance nature of offshore platform steel S355, thereby has improved the work-ing life of offshore platform steel S355.
Concrete steps of the present invention are as follows: a kind of method of offshore platform steel surface modification treatment, using offshore platform steel S355 as ground, and it is characterized in that: first S355 is carried out to surface cleaning processing, derusting by sandblast and surface irregularity and process; Secondly using electric arc as thermal source, commercial-purity aluminium is as spray material, utilizes the ferro element that the high-energy of electric arc is heated into aluminium in molten state and ground to interpenetrate, formation metallurgical binding; Next the sprayed-on Al layer forming is carried out after surface finish processing, utilize anonizing at sprayed-on Al layer Surface Creation Al
2o
3oxide film; Finally utilize ceramic coating coating to Al
2o
3oxide film carries out sealing of hole processing, and its technique is: by aluminum oxide powder, silica powder and sodium silicate binder in mass ratio 4:4:1 be pre-mixed and obtain compound, compound and deionized water ball milling are mixed into coating, are brushed to oxide film surface, then seasoning; This recombining process can obtain the protective layer finer and close, porosity is lower by less energy consumption, has greatly improved the corrosion resistance nature of ground S355.
Sealing of hole principle is to utilize the perviousness of oxide film hole adsorptivity and ceramic coating coating, and coated coating infiltration hole, is deposited in fenestra, thereby reaches the object of sealing.
Described carries out surface cleaning processing, derusting by sandblast and surface irregularity processing to S355, guarantees that S355 degree of cleaning reach Sa3 level and roughness reaches Rz40～100 μ m.
Described compound and the mass ratio of deionized water are 3:1.
Accompanying drawing explanation
Fig. 1 is S355 surface arcing spraying aluminum coating surface-interface topography, wherein (a) surface topography; (b) interface topography.
Fig. 2 is S355 surface anodic oxidation treatment rear surface-interface topography, (a) surface topography wherein, (b) interface topography.
Fig. 3 is S355 arc spraying aluminum coatings and anode oxide film surface XRD analysis schematic diagram, wherein after (a) arc spraying aluminium, (b) after anodic oxidation treatment.
Fig. 4 is sealing of hole rear surface-interface topography; (a) surface topography (b) interface topography wherein.
Fig. 5 salt air corrosion rear surface pattern, wherein (a) S355 surface corrosion pattern, (b) aluminium-plated processing rear surface erosion profile, (c) recombining process rear surface erosion profile.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
The present invention utilizes recombining process in the method for offshore platform steel S355 Surface Creation protective film, and this invention process comprises concrete steps below:
The first step: process early stage
First with organic solvent, clean S355 surface, remove surperficial grease and spot; Then adopt the method for derusting by sandblast to remove the corrosion product on S355 surface, after processing, obtain the surface of degree of cleaning Sa3 level and roughness Rz40～100 μ m.
Second step: electric arc spraying
The wire aluminium wire of spraying use, its purity >=99.5%, diameter specifications 2mm.The processing parameter of electric arc spraying is: arc voltage is controlled at (20～30) V, current control is at (200～300) A, compressed air pressure remains on (0.6～0.7) MPa, during electric arc spraying, spray gun and steel matrix surface angle are controlled at 60～90 °, distance remains on (200～250) mm, the even translational speed of spray gun (350～400) mm/s, the transfer rate of aluminium wire is (3～4) m/min, at S355 surface arcing, generate sprayed-on Al layer, its surface-interface topography as shown in Figure 1, on visible sprayed-on Al layer surface and interface, exist the defects such as hole, this has affected its corrosion resistance nature.
The 3rd step: anodic oxidation treatment
The sprayed-on Al layer that S355 surface arcing is generated carries out after surface finish and polished finish, then carries out anodic oxidation treatment.Anode oxidation process parameter is: sulfuric acid concentration: 160g/L, and aluminium ion concentration: (5-10) g/L, all the other are water; Temperature: 20 ℃, oxidation voltage: (18～20) V, current density: 1.5A/dm
2, alr mode: pressurized air, time: 45min, generates multi-hole type Al after processing
2o
3oxide film, exists obvious hole, as shown in Figure 2 on oxide film surface and interface.
Arc spraying aluminum coatings is mainly comprised of the solid solution phase of Al, as shown in Fig. 3 (a); Oxide film after anodic oxidation treatment is by Al
2o
3with Al phase composite, as shown in Fig. 3 (b).
The 4th step: sealing treatment
The concrete technology of sealing treatment is: 40g aluminum oxide powder, 40g silica powder and 10g sodium silicate binder are pre-mixed, then add 30ml deionized water ball milling to be mixed into coating, by the method for brushing, be coated to oxide film surface, then seasoning.Sealing treatment rear oxidation film surface is dense, and the hole on interface also seals, and as shown in Figure 4, can further improve the corrosion resistance nature of oxide film.
The 5th step: salt-fog test
Sample is carried out to salt spray corrosion test, salt spray corrosion test carries out according to GB 6458-86 (NSS experiment), test conditions: the continuous salt fog of (5 ± 0.5) % NaCl solution, pH scope is 6.5-7.2, spin manifold temperature is controlled at (35 ± 1) ℃, and testing installation is YQW-250 type salt-mist corrosion tester.Through 24h salt air corrosion rear surface pattern as shown in Figure 5, the S355 surface corrosion of virgin state is the most serious, occurs large-area corrosion pit, as shown in Fig. 5 (a); Electric arc spraying is processed rear sprayed-on Al layer surface slight corrosion has been occurred, and has occurred less corrosion pit and the peeling phenomenon of a little, as shown in Fig. 5 (b); Through recombining process, process rear oxidation film surface and almost do not corrode, as shown in Fig. 5 (c), its corrosion resistance nature is best.
Claims (6)
1. a method for offshore platform steel surface modification treatment, usings offshore platform steel S355 as ground, it is characterized in that: first S355 is carried out to surface cleaning processing, derusting by sandblast and surface irregularity and process; Secondly using electric arc as thermal source, commercial-purity aluminium is as spray material, utilizes the ferro element that the high-energy of electric arc is heated into aluminium in molten state and ground to interpenetrate, formation metallurgical binding; Next the sprayed-on Al layer forming is carried out after surface finish processing, utilize anonizing at sprayed-on Al layer Surface Creation Al
2o
3oxide film; Finally utilize ceramic coating coating to Al
2o
3oxide film carries out sealing of hole processing, and its technique is: by aluminum oxide powder, silica powder and sodium silicate binder in mass ratio 4:4:1 be pre-mixed and obtain compound, compound and deionized water ball milling are mixed into coating, are brushed to oxide film surface, then seasoning; This recombining process can obtain the protective layer finer and close, porosity is lower by less energy consumption, has greatly improved the corrosion resistance nature of ground S355.
2. the method for a kind of offshore platform steel surface modification treatment as claimed in claim 1, it is characterized in that: described carries out surface cleaning processing, derusting by sandblast and surface irregularity processing to S355, guarantees that S355 degree of cleaning reach Sa3 level and roughness reaches Rz40～100 μ m.
3. the method for a kind of offshore platform steel surface modification treatment as claimed in claim 1, is characterized in that: described compound and the mass ratio of deionized water are 3:1.
4. the method for a kind of offshore platform steel surface modification treatment as claimed in claim 1, it is characterized in that, described usings electric arc as thermal source, commercial-purity aluminium is as spray material, utilize the ferro element that the high-energy of electric arc is heated into aluminium in molten state and ground to interpenetrate, formation metallurgical binding refers to: the wire aluminium wire of spraying use, its purity >=99.5%, diameter specifications 2mm.
5. the processing parameter of electric arc spraying is: arc voltage is controlled at (20～30) V, current control is at (200～300) A, compressed air pressure remains on (0.6～0.7) MPa, during electric arc spraying, spray gun and steel matrix surface angle are controlled at 60～90 °, distance remains on (200～250) mm, the even translational speed of spray gun (350～400) mm/s, the transfer rate of aluminium wire is (3～4) m/min, at S355 surface arcing, generates sprayed-on Al layer.
6. the method for a kind of offshore platform steel surface modification treatment as claimed in claim 1, is characterized in that, described utilizes anonizing at sprayed-on Al layer Surface Creation Al
2o
3oxide film refers to: anode oxidation process parameter is: sulfuric acid concentration: 160g/L, and aluminium ion concentration: (5-10) g/L, all the other are water; Temperature: 20 ℃, oxidation voltage: (18～20) V, current density: 1.5A/dm
2, alr mode: pressurized air, time: 45min, generates multi-hole type Al after processing
2o
3oxide film.
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| CN201410291642.1A CN104018108B (en) | 2014-06-26 | 2014-06-26 | A kind of method of offshore platform steel surface modification treatment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108103430A (en) * | 2017-11-24 | 2018-06-01 | 四川富乐德科技发展有限公司 | A kind of control method of arc procedure aluminium meltallizing layer surface tip burr |
| CN110355691A (en) * | 2019-07-19 | 2019-10-22 | 法柯特科技（江苏）有限公司 | A kind of novel automatic sandblasting ickle plating machine |
| CN110821837A (en) * | 2019-12-12 | 2020-02-21 | 国家能源蓬莱发电有限公司 | Slurry pump |
| CN114214624A (en) * | 2021-12-20 | 2022-03-22 | 中国兵器工业第五九研究所 | Preparation method of steel material composite coating |
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|---|---|---|---|---|
| JPS60194094A (en) * | 1984-03-13 | 1985-10-02 | Sumitomo Metal Ind Ltd | Steel material thermally sprayed with aluminum having high corrosion resistance |
| CN102691025A (en) * | 2012-06-12 | 2012-09-26 | 沈阳工业大学 | Preparation method of metal-based long-acting anti-oxidation protective coating |
| CN102888640A (en) * | 2012-10-10 | 2013-01-23 | 常州大学 | Anti-salt-spray-corrosion treatment method of X70 pipeline steel surface |
| CN103374694A (en) * | 2012-04-24 | 2013-10-30 | 中国石油天然气股份有限公司 | Preparation method for anti-corrosion composite coating of oil pipe |
-
2014
- 2014-06-26 CN CN201410291642.1A patent/CN104018108B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60194094A (en) * | 1984-03-13 | 1985-10-02 | Sumitomo Metal Ind Ltd | Steel material thermally sprayed with aluminum having high corrosion resistance |
| CN103374694A (en) * | 2012-04-24 | 2013-10-30 | 中国石油天然气股份有限公司 | Preparation method for anti-corrosion composite coating of oil pipe |
| CN102691025A (en) * | 2012-06-12 | 2012-09-26 | 沈阳工业大学 | Preparation method of metal-based long-acting anti-oxidation protective coating |
| CN102888640A (en) * | 2012-10-10 | 2013-01-23 | 常州大学 | Anti-salt-spray-corrosion treatment method of X70 pipeline steel surface |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108103430A (en) * | 2017-11-24 | 2018-06-01 | 四川富乐德科技发展有限公司 | A kind of control method of arc procedure aluminium meltallizing layer surface tip burr |
| CN110355691A (en) * | 2019-07-19 | 2019-10-22 | 法柯特科技（江苏）有限公司 | A kind of novel automatic sandblasting ickle plating machine |
| CN110821837A (en) * | 2019-12-12 | 2020-02-21 | 国家能源蓬莱发电有限公司 | Slurry pump |
| CN114214624A (en) * | 2021-12-20 | 2022-03-22 | 中国兵器工业第五九研究所 | Preparation method of steel material composite coating |
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| CN104018108B (en) | 2016-06-08 |
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Effective date of registration: 20201110 Address after: 221300 Chahe Town New District, Pizhou City, Xuzhou City, Jiangsu Province Patentee after: Pizhou Borui Investment Management Co.,Ltd. Address before: Gehu Lake Road Wujin District 213164 Jiangsu city of Changzhou province No. 1 Patentee before: CHANGZHOU University |
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