CN104554619B - Technique for processing ballast tank duplex stainless steel surface of stainless steel category II chemical tanker - Google Patents
Technique for processing ballast tank duplex stainless steel surface of stainless steel category II chemical tanker Download PDFInfo
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- CN104554619B CN104554619B CN201410699347.XA CN201410699347A CN104554619B CN 104554619 B CN104554619 B CN 104554619B CN 201410699347 A CN201410699347 A CN 201410699347A CN 104554619 B CN104554619 B CN 104554619B
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Abstract
The invention relates to a technique for processing a ballast tank duplex stainless steel surface of a stainless steel category II chemical tanker. The technique includes the following steps of assembling and welding stainless steel plates and forming a plurality of subsections; before abrasive blasting in sections, firstly brush coating lime water for the stainless steel in a cargo compartment area, covering the stainless steel by using three-protective cloth, and finally sealing the joint of the three-protective cloth by using a duct tape and fixing the three-protective cloth; spraying cast steel grits with high rigidity to the stainless steel of the plurality sections of ballast tank areas so that the roughness of the stainless steel plate surface is 55-65 microns; cleaning the stainless steel plate surface by using a dust collector; sweeping the grits by using relatively fine iron and aluminum garnet sand so as to remove the cast steel grit abrasive pollutes on the stainless steel plate surface; cleaning the stainless steel plate surface by using the dust collector again; performing inspection declaration for the cleaned stainless steel plate surface; after the inspection passes, sending the stainless steel plates into a paint shop for spraying. The stainless steel surface processed by the technique disclosed by the invention has the advantages of good surface roughness, relatively clean surface and low cost.
Description
Technical field
The present invention relates to a kind of shipbuilding field, the ballast tank two phase stainless steel process of surface treatment of a kind of rustless steel two class chemical tanker.
Background technology
Along with the rise of the development of chemical industry, especially petro chemical industry, the freight volume of raw material that it is required and products thereof increases day by day.Such as early thirties in last century, the projection of Japan's artificial silk industry, need to consume substantial amounts of sodium hydroxide, originally supply client in solid transportation mode, allow client use according to the solution needing to be made into solid caustic soda variable concentrations of oneself again, for in terms of safety with work efficiency, this method does not adapts to.For amount transport liquid caustic soda, occur in that the Liquid Chemicals in Bulk ship of mass transport liquid caustic soda product the most earlier.
Chemical tanker should be defined as tanker, it is simply that build or reequip for deliver various poisonous, inflammable, easily play or the freighter of the chemical substance that is corrosive.Liquid chemical tanker mostly is double bottom and dual topside, and cargo hold is provided with separation and equipped with special goods pump and piping.Before 2005, the steel used by domestic construction chemical tanker are generally carbon steel, and loading cabin paint to be brushed carries out patch and is coated with, most 3 years of its anticorrosion time limit.If the kind of chemicals is transported in conversion, loading cabin internal layer also needs again to paste painting, the most costly, time-consuming, and later maintenance expense is the highest, so the cargo hold learning product some boats and ships of ship of constructionization have employed rustless steel at present is main material, and rustless steel transporting, lift, assemble, weld, welding inspection (such as flaw detection coloring, pressure test) and the course of processing also can bring surface and oil contaminant, scuffing, rust, impurity, low-melting-point metal pollutant, paint, welding slag, splash etc., these materials also have impact on stainless steel surfaces quality.The most polished passivation technology processes and directly uses, then stainless steel surfaces is easy to corrosion；Stainless corrosion resistance is covered with the fine and close passivating film of one layer of very thin (about Inm) mainly due to surface, and corrosive medium is isolated by this tunic, is the basic barrier of rustless steel protection.Passivation for stainless steel has behavioral characteristics: generally tending to when there is reducing agent (such as chloride ion) in environment destroy film, then can keep or repair membrane in the presence of oxidant (such as air).Although rustless steel is positioned in air with oxygen can be slowly formed oxide-film, but the protectiveness of this film is the most perfect.Generally first to carry out thorough pickling, then be passivated with oxidant, the integrity of guarantee passivating film and stability.One of purpose of pickling is to create favorable conditions for Passivation Treatment, it is ensured that form the passivating film of high-quality.Because making one layer of active iron of stainless steel surfaces and the oxide of ferrum be corroded by pickling, the chemism of acid solution makes the dissolution rate at other position on the dissolution rate specific surface of rejected region want height, therefore some can be easily caused the hidden danger of corrosion and disposed by pickling originally, made whole surface tend to uniform balance；Then, under the passivation of oxidant, stainless steel surfaces is made to produce the most stable corrosion-resistant passivating film.But the rustless steel in ballast tank region; because there being a lot of carbon steel structure in region; organic coating with protection carbon steel; so ballast tank cannot implement above-mentioned passivation technology as oil cargo tank; in addition the rustless steel of ballast tank to be also immersed in the sea water containing chloride ion, and the technology mode that therefore rustless steel of ballast tank must use sandblasting to paint carries out corrosion protection.Surface before ballast tank rustless steel japanning now processes abrasive material, a lot of shipyards generally use the non-metallic abrasive outside aluminium oxide (Brown Alundum) or use aluminium oxide, when using aluminium oxide (Brown Alundum), the carbon steel of whole segmentation and rustless steel all use aluminum oxide blast, before sandblasting, the rustless steel of Cargo Oil on-deck needs protection, enter the sandblasting of alumina abrasive workshop, sand removal is cleaned, inspection declaration, enter paint shop's spraying, the alumina ratio that the method consumes is huger, cost is the highest, abrasive material outside another kind of use aluminium oxide, the non-metallic abrasive hardness of the known inner definition of ISO 11127 is generally between Mohs 6-8, relative low price.But shipyard is had in the face of the embedding sand of steel plate of severe pollutes or relatively small surface roughness.Specification and technology requirement cannot be met.
nullObviously，For technical standpoint，The first-selected non-metallic abrasive of rustless steel sandblasting shipyard should be aluminium oxide，Stainless hardness on boats and ships is the hardest relative to for carbon steel，Hardness is at 31HRC，This characteristic causes the result of most non-metallic abrasive sandblasting the most barely satisfactory，When abrasive size (particle diameter) is big，Abrasive material clashes into stainless energy and strengthens，Roughness also can become big,Roughness meets technology requirement，But stainless steel surfaces can embed more broken sand，Cause poor surface cleaning，Can not meet the standard of ISO8502-3 dust distribution，Abrasive size (particle diameter) hour，Abrasive material clashes into stainless energy diminuendo，The embedding sand of stainless steel surfaces can reduce，Meet the standard of ISO8502-3 dust distribution，But stainless steel watch surface roughness can significantly diminish，Technical specification requirement cannot be met.
Summary of the invention
The invention aims to overcome above deficiency, it is provided that a kind of surface roughness is good, can obtain relatively clean surface cleaning situation, the ballast tank two phase stainless steel process of surface treatment of rustless steel two class chemical tanker with low cost.
The purpose of the present invention is achieved through the following technical solutions: the ballast tank two phase stainless steel process of surface treatment of a kind of rustless steel two class chemical tanker, comprises the following steps:
A, corrosion resistant plate is assembled, welding, form multiple segmentation；
Rustless steel to cargo hold district before B, sandblasting, first uses lime water to brush, then with conventional protective cloth covering, finally seals protective cloth seam with cloth base adhesive tape and fix；
C, the carbon steel structure in multiple segmentation ballast tank districts and stainless steel structure use the cast steel sand of high rigidity spray, the roughness making corrosion resistant plate surface is 55um～65um；
D, employing vacuum cleaner carry out sand removal cleaning to corrosion resistant plate surface；
E, the then thinner ferrum aluminum Punica granatum L. sand of use carry out sweeping sand, pollute for removing the cast steel sand milling material on corrosion resistant plate surface；
F, it is again with vacuum cleaner corrosion resistant plate surface is carried out sand removal cleaning；
G, finally to cleaning process after corrosion resistant plate surface carry out inspection declaration, after inspection declaration is qualified, corrosion resistant plate is sent into paint shop spraying.
Further improvement of the present invention is: the high rigidity described in step C refers to >=and 40 mesh of 55HRC～the cast steel sand of 25 mesh.
Further improvement of the present invention is: the ferrum aluminum Punica granatum L. sand more carefully referring to 60 mesh～30 mesh described in step E.
The present invention compared with prior art has the advantage that rustless steel is penetrated in the cast steel sand blasting using high rigidity 40 mesh-25 mesh, produces the roughness about 55 μm-65 μm, solves the non-metallic abrasive hardness outside aluminium oxide and causes the problem that roughness is less not.Then re-use the ferrum aluminum Punica granatum L. sand of 60 thinner mesh-30 mesh, sweep sand and remove the cast steel sand milling material of stainless steel surfaces and pollute, solve rustless steel and can not use the problem of metal abrasives, but also the problem solving the embedding sand in non-metallic abrasive surface.Both met the technology requirement of final non-metallic abrasive sandblasting, and achieved again excellent roughness and surface cleaning requirement, and the most former technological process of cost significantly declines.
Detailed description of the invention:
In order to deepen the understanding of the present invention, below in conjunction with embodiment, the invention will be further described, and this embodiment is only used for explaining the present invention, is not intended that limiting the scope of the present invention.
Invention shows the detailed description of the invention of the ballast tank two phase stainless steel process of surface treatment of a kind of rustless steel two class chemical tanker, comprise the following steps:
A, corrosion resistant plate is assembled, welding, form multiple segmentation；
Rustless steel to cargo hold district before B, sandblasting, first uses lime water to brush, then with conventional protective cloth covering, finally seals protective cloth seam with cloth base adhesive tape and fix；
C, the carbon steel structure in multiple segmentation ballast tank districts and stainless steel structure use the cast steel sand of high rigidity spray, the roughness making corrosion resistant plate surface is 55um～65um；
D, employing vacuum cleaner carry out sand removal cleaning to corrosion resistant plate surface；
E, the then thinner ferrum aluminum Punica granatum L. sand of use carry out sweeping sand, pollute for removing the cast steel sand milling material on corrosion resistant plate surface；
F, it is again with vacuum cleaner corrosion resistant plate surface is carried out sand removal cleaning；
G, finally to cleaning process after corrosion resistant plate surface carry out inspection declaration, after inspection declaration is qualified, corrosion resistant plate is sent into paint shop spraying.
High rigidity described in preferred steps C of the present invention refers to >=40 mesh of 55HRC～the cast steel sand of 25 mesh, the ferrum aluminum Punica granatum L. sand more carefully referring to 60 mesh～30 mesh described in step E.
The present invention uses the cast steel sand blasting of high rigidity 40 mesh-25 mesh to penetrate rustless steel, produces the roughness about 55 μm-65 μm, solves the non-metallic abrasive hardness outside aluminium oxide and causes the problem that roughness is less not.Then re-use the ferrum aluminum Punica granatum L. sand of 60 thinner mesh-30 mesh, sweep sand and remove the cast steel sand milling material of stainless steel surfaces and pollute, solve rustless steel and can not use the problem of metal abrasives, but also the problem solving the embedding sand in non-metallic abrasive surface.Both met the technology requirement of final non-metallic abrasive sandblasting, and achieved again excellent roughness and surface cleaning requirement, and the most former technological process of cost significantly declines.
Step roughness of the present invention is excellent, and surface dirt distribution ISO8502-3 is less than 2 grades, clean surface；Roughness 50-75 μm, roughness is excellent；Fully meet the requirement of PSPC specification, and save substantial amounts of shipbuilding cost.
Claims (3)
1. the ballast tank two phase stainless steel process of surface treatment of a rustless steel two class chemical tanker, it is characterised in that comprise the following steps:
A, corrosion resistant plate is assembled, welding, form multiple segmentation；
Rustless steel to ballast tank district before B, sandblasting, first uses lime water to brush, then with conventional protective cloth covering, finally seals protective cloth seam with cloth base adhesive tape and fix；
C, the carbon steel structure in multiple segmentation ballast tank districts and stainless steel structure using the cast steel sand of high rigidity spray, the roughness making corrosion resistant plate surface is 55um～65um；
D, employing vacuum cleaner carry out sand removal cleaning to corrosion resistant plate surface；
E, then carry out sweeping sand with thin ferrum aluminum Punica granatum L. sand, pollute for removing the cast steel sand milling material on corrosion resistant plate surface；
F, it is again with vacuum cleaner corrosion resistant plate surface is carried out sand removal cleaning；
G, finally to cleaning process after corrosion resistant plate surface carry out inspection declaration, after inspection declaration is qualified, corrosion resistant plate is sent into paint shop spraying.
The ballast tank two phase stainless steel process of surface treatment of rustless steel two class chemical tanker the most according to claim 1, it is characterised in that: the high rigidity described in step C refers to >=40 mesh of 55HRC～the cast steel sand of 25 mesh.
The ballast tank two phase stainless steel process of surface treatment of rustless steel two class chemical tanker the most according to claim 1, it is characterised in that: the thin ferrum aluminum Punica granatum L. sand described in step E refers to the ferrum aluminum Punica granatum L. sand of 60 mesh～30 mesh.
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| CN201410699347.XA CN104554619B (en) | 2014-11-28 | 2014-11-28 | Technique for processing ballast tank duplex stainless steel surface of stainless steel category II chemical tanker |
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| CN201410699347.XA CN104554619B (en) | 2014-11-28 | 2014-11-28 | Technique for processing ballast tank duplex stainless steel surface of stainless steel category II chemical tanker |
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| CN104554619B true CN104554619B (en) | 2017-01-11 |
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| CN106425874B (en) * | 2016-10-12 | 2019-02-05 | 沪东中华造船(集团)有限公司 | The coating front surface processing method of the double material-structure ballast tanks of carbon steel-stainless steel |
| CN111054891A (en) * | 2019-12-31 | 2020-04-24 | 江苏德华泵业有限公司 | Precision casting method of novel ship jet pump |
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| US4495225A (en) * | 1984-03-21 | 1985-01-22 | Economics Laboratory, Inc. | Method and composition for the prevention or inhibition of corrosion |
| GB8822641D0 (en) * | 1988-09-27 | 1988-11-02 | Int Paint Plc | Improvements related to coatings |
| JPH09206675A (en) * | 1996-02-08 | 1997-08-12 | Kansai Paint Co Ltd | Method for preventing rust in rusting face |
| JPH11139382A (en) * | 1997-11-10 | 1999-05-25 | Ishikawajima Harima Heavy Ind Co Ltd | Method for painting ballast tank of ship |
| JP2000037659A (en) * | 1998-05-20 | 2000-02-08 | Chugoku Marine Paints Ltd | Painting method for inner face of ship tank and ship painted thereby |
| CN101797555A (en) * | 2010-02-26 | 2010-08-11 | 惠生（南通）重工有限公司 | Technology for spraying seawater ballast tank |
| CN101804401A (en) * | 2010-03-29 | 2010-08-18 | 扬帆集团股份有限公司 | Painting method of seawater ballast tank |
| CN104087956B (en) * | 2014-07-22 | 2016-03-30 | 徐强 | The acid washing passivation technology of duplex stainless steel chemical tanker |
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Effective date of registration: 20161019 Address after: 226361 industrial concentration area, five town, Nantong, Jiangsu, Tongzhou District Applicant after: NANTONG RUNLI MACHINE MANUFACTURING CO., LTD. Address before: 226000 Tongzhou District City, Jiangsu Province, the town of Thean Hou Temple,, five Applicant before: Nantong Mingde Heavy Industry Co., Ltd. |
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