CN102634784B - Surface treatment method of nuclear bridge - Google Patents
Surface treatment method of nuclear bridge Download PDFInfo
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- CN102634784B CN102634784B CN201210121964.2A CN201210121964A CN102634784B CN 102634784 B CN102634784 B CN 102634784B CN 201210121964 A CN201210121964 A CN 201210121964A CN 102634784 B CN102634784 B CN 102634784B
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Abstract
The invention provides a surface treatment method of a nuclear bridge. The method comprises a zinc-plating process and a secondary passivation process. In the surface treatment method, twice passivation treatments are carried out on a zinc-plated bridge main body; an initial passivation layer which is formed by primary passivation treatment and has is a self-healing function is combined with a protection layer subjected to secondary passivation treatment; the protection layer is arranged on the outer surface of the initial passivation layer to greatly improve the sealing performance between the molecules of the initial passivation layer and prevent the bridge main body from being oxidized; and therefore, the corrosion resistance of the surface of the bridge is greatly improved, the phenomenon that white rust is easy to generate on the surface of the bridge because the bridge is deposited for a long period and is placed in humid air is effectively controlled, and the service life of the nuclear bridge is prolonged; and the service life of the bridge can reach 60 years at minimum.
Description
Technical field
The present invention relates to a kind of surface treatment method of crane span structure, particularly a kind of nuclear power crane span structure surface treatment method, belongs to the production technical field of nuclear power crane span structure.
Background technology
In the face of the rapid growth that global energy consumes, being developed to for inexorable trend of new cleaning fuel.In recent years the Quantity of domestic nuclear power is a lot, according to national nuclear power developing plan, will have at least every year six 1,000,000 kilowatts of units and building, and every unit is used the amount of cable testing bridge at 1500～2000 tons, so the consumption of nuclear power cable crane span structure is very large, market outlook are very wide.
Domestic nuclear power is all built by the sea now, and in engineering site humid environment, air, saltiness is high, very large to steel product surface corrosion.Nuclear power crane span structure surface treatment mode of the prior art is galvanizing, so zinc coating thickness, sticking power, appearance etc. are had to very high requirement.But when piling up closely and being placed in malaria due to hot galvanizing piece, plating piece surface does not have free-pouring air, the local surfaces of coating can not form protective membrane in time, and plating piece generation galvanic corrosion forms white rust.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of surface treatment method of nuclear power crane span structure, this surface treatment method can effectively be controlled the problem of nuclear power crane span structure surface at raw white rust, thereby, greatly improved the non-corrosibility of nuclear power crane span structure, extended the work-ing life of nuclear power crane span structure.
In order to solve the problems of the technologies described above, the surface treatment method of nuclear power crane span structure of the present invention, wherein, comprises the steps:
A, to the crane span structure body of moulding, carry out zinc-plated;
B, the crane span structure body after zinc-plated is carried out to water cooling, water temp is 10 ℃-40 ℃, crane span structure body is cooled to the temperature of 10 ℃-20 ℃;
C, will be cooled to the crane span structure body of 10 ℃ of-20 ℃ of temperature immerse in a passivating solution, passivating solution temperature is 20 ℃-40 ℃, passivation time is 15-20 second;
D, oven dry, dry the crane span structure body of a passivating solution of dipping, on the surface of crane span structure body, forms initial passivation, and bake out temperature is 70 ℃-80 ℃, and drying time is 20-30 second;
E, by the crane span structure body after drying, immerse in secondary passivity liquid, the temperature of secondary passivity liquid keeps 85 ℃-100 ℃; Passivation time is 50-60 second;
F, crane span structure body hot blast drying that will dipping secondary passivity liquid, formation protective membrane.
The surface treatment method of above-mentioned nuclear power crane span structure, wherein, one time passivating solution is comprised of following composition: chromium 10-100g/L, Seignette salt 10-100g/L, nitric acid 20-60g/L, surplus is water.
The surface treatment method of above-mentioned nuclear power crane span structure, wherein, secondary passivity liquid consists of the following composition: trivalent chromium 10-100g/L, silicate 30-80g/L, surplus is water.
The surface treatment method of above-mentioned nuclear power crane span structure, wherein, during hot blast drying, the first hot blast take temperature as 60 ℃-85 ℃, dries and blows 15-25 second; Hot blast take temperature as 20 ℃-35 ℃ again, dries and blows 30-45 second.
The surface treatment method of above-mentioned nuclear power crane span structure, wherein, steps A comprises the steps:
A1, employing thermokalite chemical degreasing liquid degreasing decontamination, degreasing fluid consists of the following composition (weight percent meter): sodium hydroxide 77%, sodium phosphate 7%, sodium carbonate 10%, emulsifying agent 6%; Degreasing fluid temperature is 70-90 ℃, degreasing time 10-20 minute;
A2, cleaning, clean the degreasing fluid of crane span structure body surface;
A3, rust cleaning, adopt pickle solution to eliminate rust to crane span structure body, pickle solution forms (by weight percentage) by following composition: hydrochloric acid 20%-25%, sustained release dosage 0.4%, sodium lauryl sulphate 15%, acid degreasing agent 5%, the 20-40 minute that eliminates rust under normal temperature, makes crane span structure body surface be uniform Steel Gray;
A4, by rust cleaning after crane span structure body with clear water, rinse;
A5, dipping plating assistant agent, plating assistant agent consists of the following composition: ammonium chloride 12-20g/L, zinc chloride 150-300g/L, iron protochloride 8g/L, detonation suppressor 12g/L, plating assistant agent temperature 50-60 ℃, dipping period is 1-4 minute;
A6, by dipping after crane span structure body dry after, carry out zinc-plated, crane span structure body surface form zinc coating.
The present invention carries out Passivation Treatment twice to the crane span structure body after zinc-plated, the initial passivation with self-healing function of a Passivation Treatment formation is combined with the protective layer of secondary passivity processing, at initial passivation outside surface, protective layer is set, stopping property between initial passivation molecule and molecule is improved greatly, avoid crane span structure body oxidized, thereby, greatly improved the non-corrosibility on crane span structure surface, effectively control crane span structure and piled up for a long time and be placed in the phenomenon of the easily raw white rust of malaria, extended the work-ing life (> 60 years in work-ing life) of nuclear power crane span structure.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
The surface treatment method of nuclear power crane span structure of the present invention, wherein, comprises the steps:
A, to the crane span structure body of moulding, carry out zinc-plated;
B, the crane span structure body after zinc-plated is carried out to water cooling, water temp is 10 ℃-40 ℃, crane span structure body is cooled to the temperature of 10 ℃-20 ℃;
C, cooled crane span structure body is immersed in a passivating solution, passivating solution temperature is 20 ℃-40 ℃, and passivation time is 15-20 second; One time passivating solution is comprised of following composition: chromium 10-100g/L, Seignette salt 10-100g/L, nitric acid 20-60g/L, surplus is water.
D, oven dry, dry the crane span structure body of a passivating solution of dipping, on the surface of crane span structure body, forms initial passivation, and bake out temperature is 70 ℃-80 ℃, and drying time is 20-30 second; Oxidized for fear of crane span structure body, can around crane span structure body, be coated rare gas element (as helium), avoid crane span structure body oxidized, guarantee the quality of following process,
E, by the crane span structure body after drying, immerse in secondary passivity liquid, the temperature of secondary passivity liquid keeps 85 ℃-100 ℃; Passivation time is 50-60 second; Secondary passivity liquid consists of the following composition: trivalent chromium 10-100g/L, silicate 30-80g/L, surplus is water.
F, crane span structure body hot blast drying that will dipping secondary passivity liquid, formation protective membrane.During hot blast drying, the first hot blast take temperature as 60 ℃-85 ℃, dries and blows 15-25 second; Hot blast take temperature as 20 ℃-35 ℃ again; 30-45 second is blown in baking; by the mode of successively decreasing, secondary passivity liquid is dried; form protective membrane; avoid owing to forming bubble, crackle between the too fast cooling crystal that makes protective membrane, protective membrane is formed more even, closely knit, greatly improved the erosion resistance of crane span structure; and can make protective membrane more firmly be adsorbed on the surface of crane span structure, avoid coming off.
The surface treatment method of above-mentioned nuclear power crane span structure, wherein, steps A comprises the steps:
A1, employing thermokalite chemical degreasing liquid degreasing decontamination, degreasing fluid consists of the following composition (weight percent meter): sodium hydroxide 77%, sodium phosphate 7%, sodium carbonate 10%, emulsifying agent 6% (emulsifying agent is triphen ethyl phenol, Soxylat A 25-7 or 6501); Degreasing fluid temperature is 70-90 ℃, degreasing time 10-20 minute;
A2, cleaning, clean the degreasing fluid of crane span structure body surface;
A3, rust cleaning, adopt pickle solution to eliminate rust to crane span structure body, pickle solution forms (by weight percentage) by following composition: hydrochloric acid 20%-25%, sustained release dosage 0.4% (sustained release dosage is ammonium molybdate) sodium lauryl sulphate 15%, (acid degreasing agent is BG-CLEANER acid degreasing agent or consists of the following composition acid degreasing agent 5%: polyoxyethylene octyl phenol ether 50～100g, Oleum Cocois alkylol amide 80～120g, peregal 15～25ml, polyoxyethylene aliphatic alcohol ether sodium sulphite 50～100g, phosphoric acid 80～120ml, nitric acid 150～200ml, Neutral ammonium fluoride 30～50g, hexamethyl tetramine 1～3g, surplus is water, by the mentioned component formation acid degreasing agent that stirs, this acid degreasing agent coordinates with hydrochloric acid and can reach at normal temperatures oil removing pickling one step and complete, coordinate and can remove stainless steel with sulfuric acid and hydrochloric acid, high carbon steel tempering form compared with thick-oxide, and steel surface light is corrosion-free.) surplus is water, the 20-40 minute that eliminates rust under normal temperature, makes crane span structure body surface be uniform Steel Gray;
A4, by rust cleaning after crane span structure body with clear water, rinse;
A5, dipping plating assistant agent, plating assistant agent consists of the following composition: ammonium chloride 12-20g/L, zinc chloride 150-300g/L, iron protochloride 8g/L, detonation suppressor 12g/L (the XY-FBJ-II detonation suppressor that Xuzhou Xin Yue Trade Co., Ltd. produces) surplus are water, plating assistant agent temperature 50-60 ℃, dipping period is 1-4 minute; This plating assistant agent can be removed oxygen residual on crane span structure body, and hangs up the special protective layer of one deck at crane span structure body surface, avoids crane span structure body to contact with air, prevents the generation of plating leakage, guarantees zinc-plated carrying out smoothly;
A6, by dipping after crane span structure body dry after, carry out zinc-plated, crane span structure body surface form zinc coating.
By each operation is strictly controlled, the quality of nuclear power crane span structure galvanizing is guaranteed, and has met the requirement of nuclear power to crane span structure surface galvanizing.
The present invention is by each operation is strictly controlled, and the quality of nuclear power crane span structure galvanizing is guaranteed, and has met the requirement of nuclear power to crane span structure surface galvanizing; By controlling and twice Passivation Treatment in crane span structure surface each operation is strict, effectively controlled pot galvanize product and pile up for a long time and be placed in malaria and give birth to the phenomenon of white rust.
Just the specific embodiment of the present invention of describing in above specification sheets, this does not illustrate flesh and blood of the present invention is construed as limiting, person of an ordinary skill in the technical field is reading after specification sheets and can foregoing embodiment made an amendment or is out of shape, and does not deviate from essence of an invention and scope.
Claims (2)
1. the surface treatment method of nuclear power crane span structure, is characterized in that, comprises the steps:
A, to the crane span structure body of moulding, carry out zinc-plated;
B, the crane span structure body after zinc-plated is carried out to water cooling, water temp is 10 ℃-40 ℃, crane span structure body is cooled to the temperature of 10 ℃-20 ℃;
C, will be cooled to the crane span structure body of 10 ℃ of-20 ℃ of temperature immerse in a passivating solution, passivating solution temperature is 20 ℃-40 ℃, passivation time is 15-20 second;
D, oven dry, dry the crane span structure body of a passivating solution of dipping, on the surface of crane span structure body, forms initial passivation, and bake out temperature is 70 ℃-80 ℃, and drying time is 20-30 second;
E, by the crane span structure body after drying, immerse in secondary passivity liquid, the temperature of secondary passivity liquid keeps 85 ℃-100 ℃; Passivation time is 50-60 second;
F, crane span structure body hot blast drying that will dipping secondary passivity liquid, formation protective membrane;
One time passivating solution is comprised of following composition: chromium 10-100g/L, Seignette salt 10-100g/L, nitric acid 20-60g/L, and surplus is water;
Secondary passivity liquid consists of the following composition: trivalent chromium 10-100g/L, silicate 30-80g/L, surplus is water.
2. the surface treatment method of nuclear power crane span structure as claimed in claim 1, is characterized in that, during hot blast drying, the first hot blast take temperature as 60 ℃-85 ℃, dries and blow 15-25 second; Hot blast take temperature as 20 ℃-35 ℃ again, dries and blows 30-45 second.
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| CN104087975A (en) * | 2013-12-19 | 2014-10-08 | 浙江工商大学 | Preparation method of foamed copper |
| CN103938204B (en) * | 2014-04-24 | 2016-08-17 | 上海坤孚企业(集团)有限公司 | A kind of zinc alloy surface processing method |
| CN105369242B (en) * | 2015-11-02 | 2017-11-28 | 常熟风范电力设备股份有限公司 | A kind of adjusting method of steel construction passivation temperature |
| CN109440042A (en) * | 2018-11-15 | 2019-03-08 | 江苏振光电力设备制造有限公司 | A kind of galvanized method of the scattered component of steel tower |
| CN110724945A (en) * | 2019-12-05 | 2020-01-24 | 长江润发(江苏)薄板镀层有限公司 | Surface passivation treatment process for galvanized steel sheet |
| CN115011900B (en) * | 2022-06-23 | 2023-09-15 | 上海聚丰热镀锌有限公司 | Ammonium-free plating assistant and hot galvanizing process using same |
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| CN102363875A (en) * | 2011-10-27 | 2012-02-29 | 北京京杰锐思技术开发有限公司 | Hot dip galvanizing method of steel structural members |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102363875A (en) * | 2011-10-27 | 2012-02-29 | 北京京杰锐思技术开发有限公司 | Hot dip galvanizing method of steel structural members |
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Application publication date: 20120815 Assignee: HUATONG ELECTRICAL GROUP CO., LTD. Assignor: Jiangsu Jinhuaxia Electrical Co., Ltd. Contract record no.: 2015320000557 Denomination of invention: Surface treatment method of nuclear bridge Granted publication date: 20140423 License type: Exclusive License Record date: 20150724 |
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