CN102776458A - Single-side galvanizing method for producing hot-dip galvanized steel pipe - Google Patents
Single-side galvanizing method for producing hot-dip galvanized steel pipe Download PDFInfo
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- CN102776458A CN102776458A CN2012102346522A CN201210234652A CN102776458A CN 102776458 A CN102776458 A CN 102776458A CN 2012102346522 A CN2012102346522 A CN 2012102346522A CN 201210234652 A CN201210234652 A CN 201210234652A CN 102776458 A CN102776458 A CN 102776458A
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Abstract
The invention relates to a single-side galvanizing method for producing a hot-dip galvanized steel pipe. The single-side galvanizing method comprises the following steps of: 1) workpiece pretreatment; 2) acid washing; 3) water washing; 4) plating aid dipping; 5) neutralization of plating aid on the inner wall of the steel pipe; 6) drying and preheating; 7) hot-dip galvanization; 8) passivation; 9) cooling; and 10) inspection and packaging. By destroying a plating aid layer on the inner wall of the steel pipe and accurately controlling process parameters such as galvanizing time, the single-side galvanizing method for producing the hot-dip galvanized steel pipe has the advantages that the single-size galvanizing goal of fully galvanizing the outer wall and not galvanizing the inner wall at all is achieved, the single-side hot-dip galvanized steel pipe produced by adopting the method can be closely combined with a plastic pipe, the plastic is not apt to fall, the service life of a compound pipe is guaranteed, the product quality is greatly improved and the market promotion prospect is wide.
Description
Technical field
The invention belongs to the plastic lining composite steel pipe manufacture field, particularly a kind of hot galvanized steel pipe one side zinc coating method.
Background technology
Plastic lining composite steel pipe is to mould pipe by one deck that galvanized steel pipe base material and internal surface adhere to constitute.Plastic lining composite steel pipe is compared with other various metal tubes, plastics tubing, multiunit tube; Combine the characteristics of various pipelines; The HS, deep drawing quality of steel pipe, the advantage that low temperature brittleness is good, the coefficient of expansion is little are promptly arranged; Advantages such as plastics tubing is corrosion-resistant, wear-resistant, fluid resistance is little are arranged again, are a kind of novel plumbing, anticorrosion green pipeline, by the employing more and more widely of domestic every profession and trade.
The existing existing greatest problem of plastic lining composite steel pipe is: galvanized steel pipe and internal layer are moulded and are combined effect not good enough between the pipe; The reason of searching to the bottom is: through the pot galvanize step, steel pipe inwall and outer wall after the pot galvanize all are attached with the zinc layer to galvanized steel pipe when process for processing, and the later stage moulds pipe and adopts high temperature adhesives when the steel pipe inwall; Inwall zinc layer combines dynamics little with moulding between the pipe; Particularly about 70 degree, then automatic obscission can take place, influence the intensity and the use properties of product.
To mould pipe and can combine in order to make, must the zinc layer of inwall be removed with the galvanized steel pipe inwall.At present; Inwall zinc layer is removed the following mode that adopts usually: 1: the inwall pickling, and promptly be employed in galvanized steel pipe inside and pour into the acid solution mode and carry out pickling, can dissolve after zinc layer and the acid; But it exists contaminative strong; Not environmental protection, the galvanized steel pipe outer wall contacts with acid solution easily and forms black surround, influences the product appearance quality; 2: adopt abrasion wheel grinding, it exists cost high, inefficient problem, and also lapping mode only can be removed the zinc layer of galvanized steel pipe two ends inwall, and inner zinc layer still can't be removed, and there is hidden danger in quality product; 3: sandblast dezincifies, and adopt high pressure that particle is sprayed into body inside inwall is polished, but it still exists two ends easy to operate, the problem that interlude can't be operated.
It is thus clear that it is not thorough all to exist the zinc layer to remove with upper type, there is residual problem in the galvanized pipe inwall, has a strong impact on the quality of plastic lining composite steel pipe.Therefore, it is complete bright and clean how to generate a kind of outer wall zinc layer, and the galvanized steel pipe that inwall does not have the zinc layer is a difficult problem to be solved in the industry.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, provide a kind of inwall of can realizing not have the hot galvanized steel pipe one side zinc coating method of zinc fully, it has easy handling, and the feature of environmental protection is good, and cost is low, the efficient advantages of higher.
It is to adopt following technical scheme to realize that the present invention solves its technical problem:
A kind of hot galvanized steel pipe one side zinc coating method is characterized in that: comprise the steps:
⑴ workpiece pre-treatment: remove dirts such as tube surfaces burr, iron filings, grease;
⑵ pickling: place pickling tub to soak tubing and remove steel pipe top layer oxide debris, it is 18～19%HCl that pickle solution adopts concentration, and temperature is controlled at 21～22 ℃, and the pickling time was controlled at 20～30 minutes;
⑶ washing: adopt flushing with clean water, remove the tube surfaces pickle solution;
⑷ soak plating assistant agent: steel pipe is put into helped coating bath to soak plating assistant agent, plating assistant agent is ammonium chloride, zinc chloride mixed aqueous solution, and ammonium chloride concentration is 160-180g/L, and zinc oxide concentration is 280-300g/L, and 50～60 ℃ of plating assistant agent temperature, soak time are 10-15 second;
⑸ help coating with the steel pipe inwall in: adopt the nitrate soln spraying at the steel pipe inwall, nitrate concentration is 0.5%, makes and helps in the coating ammonium chloride and inefficacy;
⑹ drying and forewarm: steel pipe is carried out preheating, and preheating temperature is 80～140 ℃;
⑺ pot galvanize: steel pipe is transported to carries out pot galvanize in the galvanizing kettle, zinc liquid temperature is 447～457 ℃, and the immersion plating time is 5～9 seconds;
⑻ passivation: adopt the passivating solution passivation;
⑼ cooling: adopt water-cooling pattern that steel pipe is cooled off, cooling temperature is 50 ℃-70 ℃;
⑽ check, packing.
And among the said step ⑷, ammonium chloride concentration is 170g/L, and zinc oxide concentration is 290g/L, and 50 ℃ of plating assistant agent temperature, soak time are 10 seconds.
And among the said step ⑺, zinc liquid temperature is 452 ℃, and the immersion plating time is 9 seconds.
Advantage of the present invention and beneficial effect are:
1. hot galvanized steel pipe one side zinc coating method of the present invention is employed in pipe material inner wall nitrate salt spray pattern, makes the steel pipe inwall help coating to lose efficacy; Reaching the later stage inwall does not have the purpose of zinc layer, and plating assistant agent adopts the mixed aqueous solution of ammonium chloride, zinc chloride, and the ammonium chloride of plating assistant agent in pot galvanize plays complexing action; Impel zinc and iron to merge, producing alloy layer increases sticking power, and zinc chloride then plays the ammonium chloride evaporable effect that prevents; Behind the spraying nitrate salt; The steel pipe inwall helps in the coating neutralization of ammonium chloride and nitrate salt and lost efficacy, thereby stops the generation of inwall alloy layer, realizes that inwall can't galvanized purpose.
2. hot galvanized steel pipe one side zinc coating method of the present invention through ammonium chloride, zinc oxide concentration among the accurate controlled step ⑷, helps plating temperature and helping the plating time; Make outer wall of steel pipe help coating to keep helping the plating effect, simultaneously, inwall helps coating to neutralize fully with the nitrate salt spraying; Simultaneously; Accurate zinc liquid temperature and soaking the time of crossing among the controlled step ⑺, thus realize that outer pipe wall is zinc-plated, and inwall does not have galvanized technical purpose.
3. hot galvanized steel pipe working method of the present invention helps coating through destroying the steel pipe inwall, accurately controls processing parameters such as zinc-plated time; Thereby reach the complete zinc layer of outer wall, and inwall does not have the one side zinc coating purpose of zinc fully, the purpose that pipe is combined closely can realized and mould to the single face hot galvanized steel pipe that the present invention produced; Mould the pipe difficult drop-off; Guarantee the work-ing life of multiunit tube, quality product improves greatly, has the vast market promotion prospect.
Embodiment
Do further explain in the face of the present invention down, following examples are descriptive, are not determinate, can not limit protection scope of the present invention with this.
A kind of hot galvanized steel pipe one side zinc coating method is characterized in that: comprise the steps:
⑴ workpiece pre-treatment: remove dirts such as tube surfaces burr, iron filings, grease; Wherein, degreasing can adopt the water-base metal degreased cleaning agent to deoil, and reaching tubing can be fully by till the water infiltration.
⑵ pickling: place pickling tub to soak tubing and remove steel pipe top layer oxide debris, it is 18～19%HCl that pickle solution adopts concentration, under 21～22 ℃, carries out pickling, and the pickling time was controlled at 20～30 minutes; In pickle solution, add inhibiter and can prevent the matrix excessive erosion and reduce iron-based body hydrogen, add the acid mist inhibiting fog agent, can suppress acid mist and overflow.
⑶ washing: adopt flushing with clean water, remove the tube surfaces pickle solution.
⑷ soak plating assistant agent: steel pipe is put into helped coating bath to soak plating assistant agent, plating assistant agent is ammonium chloride, zinc chloride mixed aqueous solution, and ammonium chloride concentration is 160-180g/L, and zinc oxide concentration is 280-300g/L, and 50～60 ℃ of plating assistant agent temperature, soak time are 10-15 second; In this step, ammonium chloride concentration the best is 170g/L, and zinc oxide concentration is 290g/L, and 50 ℃ of plating assistant agent temperature, soak time are 10 seconds.
⑸ help coating with the steel pipe inwall in: adopt the nitrate soln spraying at the steel pipe inwall, nitrate concentration is 0.5%, makes and helps in the coating ammonium chloride and inefficacy.
⑹ drying and forewarm: be out of shape owing to temperature sharply raises when the immersion plating in order to prevent workpiece, and remove residual water-content, prevent to produce quick-fried zinc, cause that zinc liquid is quick-fried to be spattered, steel pipe is carried out preheating, preheating temperature is 80～140 ℃.
⑺ pot galvanize: steel pipe is transported to carries out pot galvanize in the galvanizing kettle, zinc liquid temperature is 447～457 ℃, and the immersion plating time is: 5～9 seconds; Optimum parameter is: zinc liquid temperature is 452 ℃, and the immersion plating time is 9 seconds.Temperature is low excessively, and zinc liquid is mobile poor, and coating is thick and inhomogeneous, is prone to produce sagging, and visual appearance is poor; Temperature is high, and zinc liquid good fluidity, zinc liquid are prone to break away from workpiece, and reduce sagging and elephant skin phenomenon and take place, strong adhesion, coating is thin, and outward appearance is good, and production efficiency is high; But temperature is too high, and workpiece and zinc pot iron loss are serious, produce a large amount of cadmias, influences the zinc-impregnating layer quality and causes aberration to make surface color ugly easily, and the zinc consumption is high.Accurately control is soaked the time of crossing, and guarantees that outer wall of steel pipe is zinc-plated fully, and inwall is not zinc-plated fully.
⑻ passivation: adopt the passivating solution passivation, purpose is to improve workpiece surface weather-resistant performance, reduces or prolong the white rust time of occurrence, keeps coating to have good surface appearance.
⑼ arrangement: arrangement mainly is to remove surperficial surplus zinc and list edge to workpiece in the plating back, with adopting the special-purpose electromagnetic shaker of pot galvanize to accomplish.
⑼ cooling: adopt water-cooling pattern that steel pipe is cooled off, cooling temperature is 50 ℃-70 ℃.
⑾ check: the coating outward appearance is bright, careful, no sag, elephant skin phenomenon.The thickness check can be adopted coating thickness detector, and method is easier.Also can convert and obtain thickness of coating through the zinc adhesion amount.Bonding strength can adopt bending press, and exemplar is done 90～180 ° of bendings, answers flawless and coating to come off.Also available weight knocks check, and batch-wise is done salt-fog test and copper sulfate etching test.
⑿ packing: with the steel pipe enlacement packaging.
Although disclose embodiments of the invention and accompanying drawing for the purpose of illustration; But it will be appreciated by those skilled in the art that: in spirit that does not break away from the present invention and accompanying claims and scope; Various replacements, variation and modification all are possible; Therefore, scope of the present invention is not limited to embodiment and the disclosed content of accompanying drawing.
Claims (3)
1. a hot galvanized steel pipe one side zinc coating method is characterized in that: comprise the steps:
⑴ workpiece pre-treatment: remove dirts such as tube surfaces burr, iron filings, grease;
⑵ pickling: place pickling tub to soak tubing and remove steel pipe top layer oxide debris, it is 18～19%HCl that pickle solution adopts concentration, and temperature is controlled at 21～22 ℃, and the pickling time was controlled at 20～30 minutes;
⑶ washing: adopt flushing with clean water, remove the tube surfaces pickle solution;
⑷ soak plating assistant agent: steel pipe is put into helped coating bath to soak plating assistant agent, plating assistant agent is ammonium chloride, zinc chloride mixed aqueous solution, and ammonium chloride concentration is 160-180g/L, and zinc oxide concentration is 280-300g/L, and 50～60 ℃ of plating assistant agent temperature, soak time are 10-15 second;
⑸ help coating with the steel pipe inwall in: adopt the nitrate soln spraying at the steel pipe inwall, nitrate concentration is 0.5%, makes and helps in the coating ammonium chloride and inefficacy;
⑹ drying and forewarm: steel pipe is carried out preheating, and preheating temperature is 80～140 ℃;
⑺ pot galvanize: steel pipe is transported to carries out pot galvanize in the galvanizing kettle, zinc liquid temperature is 447～457 ℃, and the immersion plating time is 5～9 seconds;
⑻ passivation: adopt the passivating solution passivation;
⑼ cooling: adopt water-cooling pattern that steel pipe is cooled off, cooling temperature is 50 ℃-70 ℃;
⑽ check, packing.
2. according to right 1 described hot galvanized steel pipe one side zinc coating method, it is characterized in that: among the said step ⑷, ammonium chloride concentration is 170g/L, and zinc oxide concentration is 290g/L, and 50 ℃ of plating assistant agent temperature, soak time are 10 seconds.
3. according to right 1 described hot galvanized steel pipe one side zinc coating method, it is characterized in that: said step ⑺ zinc liquid temperature is 452 ℃, and the immersion plating time is 9 seconds.
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| CN2012102346522A CN102776458A (en) | 2012-07-09 | 2012-07-09 | Single-side galvanizing method for producing hot-dip galvanized steel pipe |
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| CN2012102346522A CN102776458A (en) | 2012-07-09 | 2012-07-09 | Single-side galvanizing method for producing hot-dip galvanized steel pipe |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103276334A (en) * | 2013-06-13 | 2013-09-04 | 句容恒达金属制品有限公司 | Hot galvanizing process used for road component and capable of reducing waste gas emission |
| CN103480610A (en) * | 2013-09-05 | 2014-01-01 | 贵州安吉航空精密铸造有限责任公司 | Cleaning method for oxide skins of semi-closed tubular castings |
| CN104561876A (en) * | 2014-12-30 | 2015-04-29 | 广东运通热镀锌厂有限公司 | Hot galvanizing technical method |
| CN104646954A (en) * | 2014-12-15 | 2015-05-27 | 湖南元拓实业集团有限公司 | Online continuous plating process |
| CN105113729A (en) * | 2015-09-02 | 2015-12-02 | 深圳市云宇金属科技有限公司 | Rail material for building decoration and manufacturing method thereof |
| CN107090570A (en) * | 2017-04-07 | 2017-08-25 | 江苏银河钢杆有限公司 | A kind of zincincation of electric power bar |
| CN110331357A (en) * | 2019-08-16 | 2019-10-15 | 东北大学 | The method that a kind of pair of hollow type steel carry out Coloring hot-dip galvanization |
| CN110373622A (en) * | 2019-09-04 | 2019-10-25 | 浙江量泰标准件有限公司 | A kind of method for anticorrosion treatment of bolt |
| CN110629144A (en) * | 2019-10-31 | 2019-12-31 | 溧阳市中大电力交通装备有限公司 | Channel steel hot galvanizing process |
| CN110904399A (en) * | 2019-12-03 | 2020-03-24 | 浙江天阳钢管有限公司 | Hot-dip galvanizing process for high-strength steel pipe |
| JP2020147775A (en) * | 2019-03-12 | 2020-09-17 | 日本製鉄株式会社 | Manufacturing method of galvanized steel tube |
| CN111945091A (en) * | 2019-05-15 | 2020-11-17 | 扬州澳洋顺昌金属材料有限公司 | Galvanizing production process |
| CN114086093A (en) * | 2021-11-19 | 2022-02-25 | 湖南杭德通讯有限公司 | Galvanizing treatment process for urban intelligent traffic pole |
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2012
- 2012-07-09 CN CN2012102346522A patent/CN102776458A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103276334A (en) * | 2013-06-13 | 2013-09-04 | 句容恒达金属制品有限公司 | Hot galvanizing process used for road component and capable of reducing waste gas emission |
| CN103480610A (en) * | 2013-09-05 | 2014-01-01 | 贵州安吉航空精密铸造有限责任公司 | Cleaning method for oxide skins of semi-closed tubular castings |
| CN104646954A (en) * | 2014-12-15 | 2015-05-27 | 湖南元拓实业集团有限公司 | Online continuous plating process |
| CN104561876A (en) * | 2014-12-30 | 2015-04-29 | 广东运通热镀锌厂有限公司 | Hot galvanizing technical method |
| CN105113729A (en) * | 2015-09-02 | 2015-12-02 | 深圳市云宇金属科技有限公司 | Rail material for building decoration and manufacturing method thereof |
| CN107090570A (en) * | 2017-04-07 | 2017-08-25 | 江苏银河钢杆有限公司 | A kind of zincincation of electric power bar |
| JP2020147775A (en) * | 2019-03-12 | 2020-09-17 | 日本製鉄株式会社 | Manufacturing method of galvanized steel tube |
| JP7218625B2 (en) | 2019-03-12 | 2023-02-07 | 日本製鉄株式会社 | Manufacturing method of hot-dip galvanized steel pipe |
| CN111945091A (en) * | 2019-05-15 | 2020-11-17 | 扬州澳洋顺昌金属材料有限公司 | Galvanizing production process |
| CN110331357A (en) * | 2019-08-16 | 2019-10-15 | 东北大学 | The method that a kind of pair of hollow type steel carry out Coloring hot-dip galvanization |
| CN110373622A (en) * | 2019-09-04 | 2019-10-25 | 浙江量泰标准件有限公司 | A kind of method for anticorrosion treatment of bolt |
| CN110629144A (en) * | 2019-10-31 | 2019-12-31 | 溧阳市中大电力交通装备有限公司 | Channel steel hot galvanizing process |
| CN110904399A (en) * | 2019-12-03 | 2020-03-24 | 浙江天阳钢管有限公司 | Hot-dip galvanizing process for high-strength steel pipe |
| CN114086093A (en) * | 2021-11-19 | 2022-02-25 | 湖南杭德通讯有限公司 | Galvanizing treatment process for urban intelligent traffic pole |
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Application publication date: 20121114 |