CN101649440B - Hot-dip aluminum plating assistant method - Google Patents
Hot-dip aluminum plating assistant method Download PDFInfo
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- CN101649440B CN101649440B CN2009101143834A CN200910114383A CN101649440B CN 101649440 B CN101649440 B CN 101649440B CN 2009101143834 A CN2009101143834 A CN 2009101143834A CN 200910114383 A CN200910114383 A CN 200910114383A CN 101649440 B CN101649440 B CN 101649440B
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- dip aluminum
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Abstract
The invention relates to the technical field of surface corrosion prevention of steel and belongs to an environmental-protection hot-dip aluminum plating assistant used for assisting plating in the process of steel hot-dip aluminum plating technique by a hydrosolvent method. The assistant comprises a mixed water solution consisting of borax (Na2B4O7.10H2O) and sodium chloride (NaCl). The plating assisting of the steel workpieces is carried out at 70-90 DEG C for 2-5 minutes, and then drying and hot-dip aluminum plating are carried out. The plating assistant can solve the problems of uneven plating layer and plating missing of the hot-dip aluminum plating products, which are caused by the plating assisting, and can also solve the problems of high toxicity and high price of the potassium fluorozirconate plating assistant. The assistant has the advantages of simple formula, low cost, no toxicity and environmental protection, and is beneficial to the health of the workers; the product hasthe advantages of high quality and favorable corrosion resistance; and the plating layer has the advantages of compactness, evenness, high adhesive force, golden luster on the surface layer, and beautiful appearance.
Description
Technical field
The present invention relates to steel surface aseptic technic field, particularly a kind of thermal dip plating of steel aluminium helps the method for plating.
Background technology
After the steel material is aluminized, can make its intensity that had both had steel, have the character of aluminium again.Its surperficial aluminium coated has the outward appearance of aluminium, and the alloy layer that coating and steel matrix form has good thermotolerance, can prevent the corrosion of steel effectively.Aluminum steel has been widely used in interchanger, automobile exhaust pipe, sound damper etc.Aluminum plating process adopts the solvent method or immersion more, and its method is that the steel workpiece is dipped in the molten aluminum liquid, and dipping for some time, at this moment a series of chemistry and physical reaction will take place for steel and aluminium liquid, forms metallic compound at steel surface.After the steel workpiece took out cooling, the surface attachment layer of aluminum liquid of steel formed aluminium coat.Thereby the corrosion resistance of steel is greatly improved, and reduced the loss that steel oxidation gets rusty and causes, and saves resource, produces good economic benefit.The resistance to corrosion of hot dip aluminum plating steel depends on the quality of aluminium coat, and the quality of the quality of aluminium coated and the quality of molten aluminium, preplating steel has close getting in touch.Water solvent method hot dip aluminum plating steel workpiece must be handled through helping plating, could improve the surfactivity of preplating steel workpiece before entering molten aluminium.Helping plating to handle is that the steel workpiece through alkali cleaning, pickling is immersed in the plating assistant agent, makes steel surface generation chemistry and physical reaction.After the steel workpiece took out drying, the steel workpiece surface formed layer of even salt film thereby can secluding air, and protection steel workpiece is not oxidized, strengthens the surfactivity of steel workpiece, so that the effect that obtains in the time of hot dip aluminum plating.Help the direct quality that influences steel workpiece hot dip aluminum plating coating of quality of plating quality.When helping the plating quality good, hot-dip coating does not have plating leakage, and coating is even, and sticking power is good, and can enhance productivity.Yet, still do not have the ideal method about thermal dip plating of steel aluminium at present.
Plating assistant agent commonly used is the mixture aqueous solution of zinc chloride, ammonium chloride and other fluorochemicals, and ammonium chloride, Repone K and the sodium chloride mixture aqueous solution of employing etc. is also arranged.Wherein use zinc chloride, ammonia chloride plating assistant agent to handle the steel workpiece, when immersing aluminium liquid, help the plating salt film and the aluminium liquid of steel workpiece surface react, emit ammonia, hydrogenchloride, aluminum chloride gas, cause uneven coating even, even the plating leakage phenomenon is arranged, and the aluminum chloride contaminate environment of emitting, and zinc chloride is poisonous, the injury HUMAN HEALTH.
NH
4Cl＝HCl↑+NH3↑
3ZnCl
2+2Al＝2AlCl
3↑+3Zn
Chinese patent CN99100655.0 discloses a kind of hot dipping aluminium plating technology for steel, adopt Repone K, sodium-chlor, sodium aluminum fluoride and aluminum fluoride as plating assistant agent, can access the less hot dip process product of plating leakage, but its product surface defectiveness still easily forms the pin hole plating leakage.The disclosed water-soluble plating aid for hot immersion aluminum-plating of Chinese patent CN88105051.2, the mixing water solvent that adopts potassium fluozirconate, Repone K, aluminum fluoride, Potassium monofluoride, hydrofluoric acid is as plating assistant agent.Steel surface there is stronger activation, has improved the wetting capacity of aluminium liquid, can obtain seldom quality hot dip aluminum plating product preferably of plating leakage steel surface.Patent CN01127196.5 thermal dip plating of steel zinc-aluminium is the alloy water-soluble fluxing agent, adopt potassium fluozirconate, Repone K, aluminum fluoride, Potassium monofluoride, Neutral ammonium fluoride and ammonium chloride as plating assistant agent, steel surface there is stronger wetting capacity, simultaneously the oxide compound in the plating bath there is certain solvency action, has improved the quality of coating.Chinese patent CN88105051.2 and CN01127196.5 report can improve the quality of coating, but the potassium fluozirconate toxicity that is adopted in the prescription big, cost an arm and a leg, be not suitable for the extensive use of factory.
Summary of the invention
The objective of the invention is in order to overcome the deficiency of present thermal dip plating of steel aluminium institute using method, invent and a kind ofly help plating effective, be applicable to factory's scale operation hot dip aluminum plating method.
The present invention is achieved in that
Thermal dip plating of steel aluminium helps the method for plating, it is characterized in that: earlier the steel workpiece is carried out alkali cleaning, pickling, washing, guarantee that steel workpiece to be plated is rustless, surface cleaning immerses borax 30～400g/L with the steel workpiece then, in the water-soluble fluxing agent solution that sodium-chlor 5～80g/L forms, controlled temperature is 70～90 ℃, time is 2～5min, and it is even to make plating assistant agent fully activate, soak into steel workpiece film forming, adopts 300 ℃ of dry solidifications then.
Above-described water-soluble fluxing agent solution in the application process of thermal dip plating of steel aluminium, adopts the air blowing mode to guarantee the even of plating assistant agent solution.
Below describe processing step of the present invention in detail:
1, alkali cleaning: the steel workpiece is inserted 5～30%NaOH, 5～25%Na
2SiO
3With 5～35%Na
3PO
4In the mixed aqueous solution, temperature is 80～100 ℃, and the time is 30 minutes, removes the greasy dirt of steel workpiece surface.
2, once washing: the alkali of water flush away steel workpiece surface remnants.
3, pickling: the steel workpiece is inserted in 20～31% aqueous hydrochloric acids, remove the iron rust of steel surface.
4, secondary water washing: the hydrochloric acid water flush away that pickling steel workpiece surface is residual.
5, help plating: it is that 30～400g/L, sodium chloride content are in the plating assistant agent aqueous solution of 5～80g/L that the steel workpiece is inserted borax content, and helping the plating temperature is 70～90 ℃, and the time is 2～5min, and adopts the air blowing mode to guarantee the even of the plating assistant agent aqueous solution.
6, drying: drying temperature is 300 ℃, and the time is 5min, makes the steel workpiece surface form thin film.
7, hot dip aluminum plating: lentamente the steel workpiece is put into molten aluminium, the temperature of aluminium liquid is 700～720 ℃, and the hot dip process time is 2min.
8, cooling: with pull rate slowly the steel workpiece is proposed from molten aluminium, be placed on naturally cooling in the air, coating is fully solidified.
9, aftertreatment and be packaged to be the hot dip aluminum plating product
Advantage of the present invention and effect:
1, thermal dip plating of steel aluminium of the present invention helps the method for plating, and the plating assistant agent of selecting for use is with low cost, and the borax of use and sodium-chlor all are inexpensive pharmaceutical chemicalss commonly used, and the component concentration of the medicine of plating assistant agent is low, and it is few to consume medicine.
2, the plating assistant agent nontoxicity selected for use of present method is to not injury of workers'health.
3, the plating assistant agent selected for use of present method has very strong wetting capacity to the steel workpiece surface, can form good salt film protection steel workpiece when helping plating to handle.
4, adopt present method to help plating free from environmental pollution, in the time of hot dip aluminum plating, can not emit toxic gases such as aluminum chloride.
5, the hot dip aluminum plating product corrosion resistance that adopts present method to produce is outstanding.Quality of coating is good, surfacing, and coating is evenly fine and close, no plating leakage phenomenon, sticking power is good, and coating is thinner, has reduced the consumption of aluminium.Steel workpiece coating is golden yellow, and product is attractive in appearance.
Below in conjunction with accompanying drawing, the present invention is described in detail.
Description of drawings
Fig. 1 is a process flow diagram of the present invention.
Technological process of the present invention is: alkali cleaning, once washing, pickling, secondary washing, obtain the immersion plating product after helping plating, drying, hot-dip aluminizing, cooling and post processing.
Embodiment
Embodiment 1: 1.2 mm thick Q235 steel workpiece are inserted 15%NaOH, 10%Na
2SiO
3And 10%Na
3PO
4In the mixed aqueous solution, temperature is 90 ℃, and the time is 30 minutes, removes the greasy dirt of steel workpiece surface, the alkali of water flush away steel workpiece surface remnants.Then the steel workpiece is inserted concentration and be in 31% the aqueous hydrochloric acid, remove the iron rust of steel surface, the residual hydrochloric acid of water flush away steel workpiece surface.It is that 50g/L, sodium chloride content are in the plating assistant agent aqueous solution of 10g/L that the steel workpiece is inserted borax content, adopts the air blowing mode to guarantee the even of the plating assistant agent aqueous solution, and helping the plating temperature is 90 ℃, and the time is 2.5min.To carry out drying through the steel workpiece that helps plating to handle, temperature is 300 ℃, and the time is 5min, makes the steel workpiece surface form thin film.Slowly the steel workpiece is put into molten aluminium, the temperature of aluminium liquid is 720 ℃, and the hot dip process time is 2min.With certain pull rate the steel workpiece is taken out from molten aluminium, place naturally cooling in the air, coating is fully solidified.Obtain the hot dip aluminum plating product at last.The thermal dip plating of steel aluminium product surface of gained is smooth, and coating is evenly fine and close, is golden yellow, no plating leakage defective, and sticking power is good, and resistance to corrosion is strong.
Embodiment 2: 3 mm thick Q235 steel special-shaped structural parts are inserted 12%NaOH, 8%Na
2SiO
3And 15%Na
3PO
4In the mixed aqueous solution, temperature is 95 ℃, and the time is 30 minutes, removes the greasy dirt of steel workpiece surface, the alkali of water flush away steel workpiece surface remnants.Then the steel workpiece is inserted concentration and be in 27% the aqueous hydrochloric acid, remove the iron rust of steel surface, the residual hydrochloric acid of water flush away steel workpiece surface.It is 30g/L that the steel workpiece is inserted borax content, and sodium chloride content is in the plating assistant agent aqueous solution of 30g/L, adopts the air blowing mode to guarantee the even of the plating assistant agent aqueous solution, and helping the plating temperature is 80 ℃, and the time is 3.5min.To carry out drying through the steel workpiece that helps plating to handle, temperature is 300 ℃, and the time is 5min, makes the steel workpiece surface form thin film.Slowly the steel workpiece is put into molten aluminium, the temperature of aluminium liquid is 710 ℃, and the hot dip process time is 2min.With certain pull rate the steel workpiece is taken out from molten aluminium, place naturally cooling in the air, coating is fully solidified.Obtain the hot dip aluminum plating product at last.The thermal dip plating of steel aluminium product surface of gained is smooth, and coating is evenly fine and close, is golden yellow, no plating leakage defective, and sticking power is good, and resistance to corrosion is strong.
Embodiment 3: No. 45 steel workpieces of 2 mm thick are inserted concentration 10%NaOH, 12%Na
2SiO
3And 15%Na
3PO
4In the mixed aqueous solution, temperature is 90 ℃, and the time is 30 minutes, removes the greasy dirt of steel workpiece surface, the alkali of water flush away steel workpiece surface remnants.Then the steel workpiece is inserted concentration and be in 20% the aqueous hydrochloric acid, remove the iron rust of steel surface, the residual hydrochloric acid of water flush away steel workpiece surface.It is 80g/L that the steel workpiece is inserted borax content, and sodium chloride content is in the plating assistant agent aqueous solution of 5g/L, adopts the air blowing mode to guarantee the even of the plating assistant agent aqueous solution, and helping the plating temperature is 70 ℃, and the time is 5min.To carry out drying through the steel workpiece that helps plating to handle, temperature is 300 ℃, and the time is 5min, makes the steel workpiece surface form thin film.Slowly the steel workpiece is put into molten aluminium, the temperature of aluminium liquid is 700 ℃, and the hot dip process time is 2min.With certain pull rate the steel workpiece is taken out from molten aluminium, place naturally cooling in the air, coating is fully solidified.Obtain the hot dip aluminum plating product at last.The thermal dip plating of steel aluminium product surface of gained is smooth, and coating is evenly fine and close, no plating leakage defective, and sticking power is good, and resistance to corrosion is strong.
Embodiment 4: 2 mm thick Q235 steel special-shaped structural parts are inserted 12%NaOH, 8%Na
2SiO
3And 15%Na
3PO
4In the mixed aqueous solution, temperature is 95 ℃, and the time is 30 minutes, removes the greasy dirt of steel workpiece surface, the alkali of water flush away steel workpiece surface remnants.Then the steel workpiece is inserted concentration and be in 27% the aqueous hydrochloric acid, remove the iron rust of steel surface, the residual hydrochloric acid of water flush away steel workpiece surface.It is 200g/L that the steel workpiece is inserted borax content, and sodium chloride content is in the plating assistant agent aqueous solution of 60g/L, adopts the air blowing mode to guarantee the even of the plating assistant agent aqueous solution, and helping the plating temperature is 80 ℃, and the time is 3.5min.To carry out drying through the steel workpiece that helps plating to handle, temperature is 300 ℃, and the time is 5min, makes the steel workpiece surface form thin film.Slowly the steel workpiece is put into molten aluminium, the temperature of aluminium liquid is 710 ℃, and the hot dip process time is 2min.With certain pull rate the steel workpiece is taken out from molten aluminium, place naturally cooling in the air, coating is fully solidified.Obtain the hot dip aluminum plating product at last.The thermal dip plating of steel aluminium product surface of gained is smooth, and coating is evenly fine and close, is golden yellow, no plating leakage defective, and sticking power is good, and resistance to corrosion is strong.
Claims (2)
1. a thermal dip plating of steel aluminium helps the method for plating, it is characterized in that: earlier the steel workpiece is carried out alkali cleaning, pickling, washing, guarantee that steel workpiece to be plated is rustless, surface cleaning immerses borax 30～400g/L with the steel workpiece then, in the water-soluble fluxing agent solution that sodium-chlor 5～80g/L forms, controlled temperature is 70～90 ℃, time is 2～5min, and it is even to make plating assistant agent fully activate, soak into steel workpiece film forming, adopts 300 ℃ of dry solidifications then.
2. thermal dip plating of steel aluminium according to claim 1 helps the method for plating, it is characterized in that: described water-soluble fluxing agent solution, in the application process of thermal dip plating of steel aluminium, adopt the air blowing mode to guarantee the even of plating assistant agent solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101143834A CN101649440B (en) | 2009-09-11 | 2009-09-11 | Hot-dip aluminum plating assistant method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101143834A CN101649440B (en) | 2009-09-11 | 2009-09-11 | Hot-dip aluminum plating assistant method |
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| Publication Number | Publication Date |
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| CN101649440A CN101649440A (en) | 2010-02-17 |
| CN101649440B true CN101649440B (en) | 2011-01-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102251203B (en) * | 2010-05-18 | 2014-03-12 | 海洋王照明科技股份有限公司 | Technology of hot dip aluminium-plating and application thereof |
| CN104404421A (en) * | 2014-11-10 | 2015-03-11 | 安徽瑞研新材料技术研究院有限公司 | Novel nanotechnology mechanical galvanizing anticorrosion technology |
| JP7350058B2 (en) * | 2019-03-29 | 2023-09-25 | 株式会社アライドマテリアル | composite material |
| CN111015131B (en) * | 2019-12-31 | 2021-06-29 | 福建金锐达金属包装有限公司 | Preparation process of tinplate can cover |
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Effective date of registration: 20170601 Address after: 530200, 2, Liang Ling Road, Nanning, the Guangxi Zhuang Autonomous Region Patentee after: Nanning Kaiyuan iron tower Co., Ltd. Address before: 530004 the Guangxi Zhuang Autonomous Region XiXiangTang Nanning University Road No. 100 Patentee before: Guangxi University |
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