CN104152836A - Hot-dip galvanizing process - Google Patents
Hot-dip galvanizing process Download PDFInfo
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- CN104152836A CN104152836A CN201410395698.1A CN201410395698A CN104152836A CN 104152836 A CN104152836 A CN 104152836A CN 201410395698 A CN201410395698 A CN 201410395698A CN 104152836 A CN104152836 A CN 104152836A
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Abstract
The invention provides a hot-dip galvanizing process. The hot-dip galvanizing process comprises the processing steps of black piece stacking, acid pickling, washing, plating assistance, drying, galvanizing, air blowing, cooling, finishing, packaging, passivating, rinsing and warehouse entering. Hydrochloric acid inhibitors are added into pickling solutions, mist suppression corrosion inhibitors are adopted by the hydrochloric acid inhibitors, the pickling speed is high, the rust removal quality is good, the overpickling phenomenon is avoided, generation of acid mist can be suppressed, the labor environment can be improved, and the comprehensive production cost of an enterprise is reduced.
Description
?
Technical field
The present invention relates to chemical field, be specifically related to zincincation.
Background technology
Galvanizing is make molten metal and iron-based precursor reactant and produce alloy layer, thereby make matrix and coating, the two combines, galvanizing is first the parts of iron and steel matter to be carried out to pickling, in order to remove the ferric oxide of parts surface of iron and steel matter, after pickling, by soaking in ammonium chloride or solder(ing)acid or ammonium chloride and zinc chloride mixed aqueous solution groove, formation helps plating salt film, then send in hot dip process pot, it is even that pot galvanize has coating, strong adhesion, the advantages such as long service life, but, under prior art condition, the technical hydrochloric acid that pickle solution composition is is 32% left and right by concentration is diluted with water to 17% left and right gained, because hydrochloric acid is very violent with iron reaction, if pickling time is not grasped, easily cause black to occur overpickling phenomenon, black loss is large, also consumed a large amount of hydrochloric acid simultaneously, increase production cost.
Summary of the invention
Technical problem to be solved by this invention is to provide hot-dip galvanizing technique, and pickling speed is fast, and derusting is good, has avoided occurring overpickling phenomenon, can suppress the generation of acid mist, can improve work situation, has reduced the comprehensive production cost of enterprise.
For solving above-mentioned existing technical problem, the present invention adopts following scheme: hot-dip galvanizing technique, and its processing step is:
(1) stacking neat by black;
(2) pickle solution is sprayed on black and is rinsed; Put into acid tank by black and carry out pickling;
(3) will clean by clear water through black of overpickling;
(4) black is put into and help coating bath, by reacting with the quickening liquid being formed with ammonium chloride solution by liquor zinci chloridi, form salt film on black surface;
(5) by black the oven dry through helping plating reaction;
(6) put into zinc liquid by black of oven dry zinc-plated;
(7) just having plated black of zinc enters air knife mouthpiece by the running roller on air-blowing roller-way and carries out air-blowing;
(8) made black of air-blowing cooling;
(9) by zinc-plated black finishing, the packing completing;
(10) by zinc-plated black passivation, the rinsing completing;
(11) to completing black finished product warehouse-in of rinsing,
It is characterized in that: in described pickle solution, be added with salt acid inhibitor, described salt acid inhibitor adopts and presses down mist inhibiter, and pickling speed is fast, derusting is good, has avoided occurring overpickling phenomenon, can suppress the generation of acid mist, can improve work situation, reduce the comprehensive production cost of enterprise.
As preferably, described tail gas heating after helping coating bath by gas-fired also makes the temperature of quickening liquid reach 40 DEG C ~ 60 DEG C, quickening liquid temperature raises, its activity also increases thereupon, ammonium chloride and zinc oxide concentration just can suitably reduce, thereby have reduced production cost, have avoided because of ammonium chloride and zinc oxide concentration is too high forms blocked up salt film on black surface, while having avoided zinc-plated, undried salt film causes that zinc liquid is quick-fried and spatters, and has avoided the generation of the situation such as blocked up in coating simultaneously.
As preferably, described in tail gas heating after helping coating bath by gas-fired make the temperature of quickening liquid reach 50 DEG C, can make quickening liquid activity reach best, reduced to the full extent ammonium chloride and zinc oxide concentration.
As preferably, the concentration of described ammonium chloride adopts 150g/L ~ 350g/L, has reduced the concentration of ammonium chloride, has avoided forming on black surface the blocked up plating salt film that helps.
As preferably, the concentration of described ammonium chloride adopts 250g/L, makes the concentration of ammonium chloride reach best, has further avoided forming on black surface the blocked up plating salt film that helps.
As preferably, described chlorination zinc concentration adopts 75g/L ~ 175g/L, has reduced chlorination zinc concentration, has avoided forming on black surface the blocked up plating salt film that helps.
As preferably, described chlorination zinc concentration adopts 125g/L, makes chlorination zinc concentration reach best, has further avoided forming on black surface the blocked up plating salt film that helps.
As preferably, described helping is provided with circulation deferrization equipment in coating bath, comprise the magnetic screen that some metafiltration hole arranges from big to small successively, magnetic screen one side is provided with water pump, and water pump is carried quickening liquid, and quickening liquid is constantly passed through from magnetic screen, make iron adsorption in magnetic screen, ensure that the ferrous ion content in plating assistant agent can be not too high, cadmia generation is reduced, saved zinc consumption.
As preferably, in described zinc liquid, be added with zinc-aluminium rare earth multicomponent alloy, can improve the oxidation-resistance of zinc liquid, reduce the oxidization burning loss of zinc face, reduce zinc gray, zinc liquid good fluidity, in zinc liquid, slag is few, can make the speed of response of zinc liquid and plating piece iron reduce, obviously attenuate fe-zn alloy layer, the outward appearance of coating and bright property are good, and the resistance to white rust ability of coating is good.
As preferably, the running roller of described air-blowing roller-way adopts magnetic roll, and magnetic force is adsorbed on plating piece on running roller, and plating piece does not rock in transport process, and after being blown over by air knife, surperficial zinc layer is very even.
Beneficial effect:
The hot-dip galvanizing technique that the present invention adopts technique scheme to provide, pickling speed is fast, derusting is good, avoid occurring overpickling phenomenon, can suppress the generation of acid mist, can improve work situation, reduce the comprehensive production cost of enterprise, ammonium chloride and chlorination zinc concentration are reduced, avoid because of ammonium chloride and zinc oxide concentration is too high forms blocked up salt film on black surface, ensure that the ferrous ion content in plating assistant agent can be not too high, cadmia generation is reduced, save zinc consumption, can improve the oxidation-resistance of zinc liquid, reduce the oxidization burning loss of zinc face, reduce zinc gray, zinc liquid good fluidity, in zinc liquid, slag is few, can make the speed of response of zinc liquid and plating piece iron reduce, obviously attenuate fe-zn alloy layer, the outward appearance of coating and bright property are good, the resistance to white rust ability of coating is good, can make plating piece not rock in transport process, after being blown over by air knife, surface zinc layer is very even.
Embodiment
Hot-dip galvanizing technique, its processing step is:
(1) stacking neat by black;
(2) pickle solution is sprayed on black and is rinsed; Put into acid tank by black and carry out pickling;
(3) will clean by clear water through black of overpickling;
(4) black is put into and help coating bath, by reacting with the quickening liquid being formed with ammonium chloride solution by liquor zinci chloridi, form salt film on black surface;
(5) by black the oven dry through helping plating reaction;
(6) put into zinc liquid by black of oven dry zinc-plated;
(7) just having plated black of zinc enters air knife mouthpiece by the running roller on air-blowing roller-way and carries out air-blowing;
(8) made black of air-blowing cooling;
(9) by zinc-plated black finishing, the packing completing;
(10) by zinc-plated black passivation, the rinsing completing;
(11) to completing black finished product warehouse-in of rinsing,
In described pickle solution, be added with salt acid inhibitor, described salt acid inhibitor adopts and presses down mist inhibiter, before improving, the technical hydrochloric acid that pickle solution composition is is 32% left and right by concentration is diluted with water to 17% left and right gained, because hydrochloric acid is very violent with iron reaction, if pickling time is not grasped, easily cause black to occur overpickling phenomenon, black loss is large, also consumed a large amount of hydrochloric acid simultaneously, increase production cost, after improvement, in original pickle solution, add salt acid inhibitor, pickling speed is fast, derusting is good, there will not be overpickling phenomenon, can also suppress the generation of acid mist, improve work situation, reduce the comprehensive production cost of enterprise.Below the measure of merit to salt acid inhibitor:
1, two glasss of aqueous hydrochloric acid 100mL that concentration of hydrochloric acid is 15% left and right of preparation;
2, add wherein that 1mL's press down mist inhibiter in one glass;
3, in two beakers, put into five iron blocks that surface is clean respectively, after half an hour, one and a half hours, two and one-half-hours, measure respectively two iron protochloride concentration in beaker;
4, observe the degree that in two beakers, hydrochloric acid reacts with iron block.
Corrosion mitigating effect calculates:
| ? | 0.5h | 1.5h | 2.5h |
| Do not add the iron protochloride concentration (g/L) of inhibiter | 6.3 | 15.9 | 23.4 |
| Add the iron protochloride concentration (g/L) of inhibiter | 1 | 1.3 | 2 |
For example data are as implied above, the hcl corrosion speed that does not add inhibiter is (23.4-6.3)/2=8.55, the hcl corrosion speed that has added inhibiter is (2-1)/2=0.5, and the corrosion mitigating effect of inhibiter is (8.55-0.5)/2=0.94, and corrosion mitigating effect is 94%.
Described tail gas heating after helping coating bath by gas-fired also makes the temperature of quickening liquid reach 50 DEG C, the concentration of described ammonium chloride adopts 250g/L, described chlorination zinc concentration adopts 125g/L, before improving, quickening liquid temperature is too low, zinc chloride and ammonium chloride concentration are too high, ammonium chloride concentration is up to 350g/L, zinc oxide concentration is 175g/L, quickening liquid Central Asia iron ion content is too high, quickening liquid temperature is too low, cause quickening liquid activity too low, for avoiding product plating leakage, only be improved zinc chloride and ammonium chloride concentration, but zinc chloride and ammonium chloride concentration are too high, the salt film forming on black surface is difficult for parching, when zinc-plated, easily cause that zinc liquid is quick-fried to be spattered, for avoiding splashing of zinc, product can only slowly enter zinc and bathe, galvanizing time extends, cause thickness of coating to increase, after improvement, quickening liquid temperature raises, and activity also increases thereupon, and ammonium chloride and zinc oxide concentration just can suitably reduce, thereby have reduced production cost.
Described helping is provided with circulation deferrization equipment in coating bath, before improving, iron ion in quickening liquid can be followed black and be entered together zinc pot, reacts form cadmia with zinc, causes zinc consumption to rise, common 1 part of iron can consume the zinc formation cadmia of 25 parts, after improvement, the operation of circulation deferrization equipment, has ensured that the ferrous ion content in plating assistant agent can be not too high, cadmia generation is reduced, saved zinc consumption.
In described zinc liquid, be added with zinc-aluminium rare earth multicomponent alloy, before improving, zinc liquid composition in zinc pot is mainly the zinc ingot metal of No. 0, zinc liquid surface oxidation speed is fast, zinc gray is many, zinc liquid poor fluidity, plating piece surface zinc bed thickness, outward appearance is brightless, and after improving, in zinc liquid, rationally add zinc-aluminium rare earth multicomponent alloy, can improve the oxidation-resistance of zinc liquid, reduce the oxidization burning loss of zinc face, reduce zinc gray, zinc liquid good fluidity, in zinc liquid, slag is few, can make the speed of response of zinc liquid and plating piece iron reduce, obviously attenuate fe-zn alloy layer, the outward appearance of coating and bright property are good, the resistance to white rust ability of coating is good.
The running roller of described air-blowing roller-way adopts magnetic roll, before improving, plating piece enters air knife mouthpiece by the running roller on roller-way, due to mechanical vibration, plating piece teetertotters in transport process, after being blown over by air knife, surperficial zinc layer is inhomogeneous, after improvement, magnetic force is adsorbed on plating piece on running roller, plating piece does not rock in transport process, and after being blown over by air knife, surperficial zinc layer is very even.
Claims (10)
1. hot-dip galvanizing technique, its processing step is:
Stacking neat by black;
Pickle solution is sprayed on black and is rinsed;
To clean by clear water through black of overpickling;
Black is put into and help coating bath, by reacting with the quickening liquid being formed with ammonium chloride solution by liquor zinci chloridi, form salt film on black surface;
By black the oven dry through helping plating reaction;
Put into zinc liquid by black of oven dry zinc-plated;
Just having plated black of zinc enters air knife mouthpiece by the running roller on air-blowing roller-way and carries out air-blowing;
Made black of air-blowing cooling;
By zinc-plated black finishing, the packing completing;
By zinc-plated black passivation, the rinsing completing;
To completing black finished product warehouse-in of rinsing,
It is characterized in that: in described pickle solution, be added with salt acid inhibitor, described salt acid inhibitor adopts and presses down mist inhibiter.
2. hot-dip galvanizing technique according to claim 1, is characterized in that: described in tail gas heating after helping coating bath by gas-fired make the temperature of quickening liquid reach 40 DEG C ~ 60 DEG C.
3. hot-dip galvanizing technique according to claim 2, is characterized in that: described in tail gas heating after helping coating bath by gas-fired make the temperature of quickening liquid reach 50 DEG C.
4. hot-dip galvanizing technique according to claim 1, is characterized in that: the concentration of described ammonium chloride adopts 150g/L ~ 350g/L.
5. hot-dip galvanizing technique according to claim 4, is characterized in that: the concentration of described ammonium chloride adopts 250g/L.
6. hot-dip galvanizing technique according to claim 1, is characterized in that: described chlorination zinc concentration adopts 75g/L ~ 175g/L.
7. hot-dip galvanizing technique according to claim 6, is characterized in that: described chlorination zinc concentration adopts 125g/L.
8. hot-dip galvanizing technique according to claim 1, is characterized in that: described in help and in coating bath, be provided with circulation deferrization equipment.
9. hot-dip galvanizing technique according to claim 1, is characterized in that: in described zinc liquid, be added with zinc-aluminium rare earth multicomponent alloy.
10. hot-dip galvanizing technique according to claim 1, is characterized in that: the running roller of described air-blowing roller-way adopts magnetic roll.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410395698.1A CN104152836B (en) | 2014-08-13 | 2014-08-13 | hot-dip galvanizing technique |
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| CN201410395698.1A CN104152836B (en) | 2014-08-13 | 2014-08-13 | hot-dip galvanizing technique |
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| CN104152836A true CN104152836A (en) | 2014-11-19 |
| CN104152836B CN104152836B (en) | 2016-09-14 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105296998A (en) * | 2015-11-10 | 2016-02-03 | 首钢总公司 | Control method of surface cracks of passivated membrane of chromium-free passivated galvanized plate |
| CN105779921A (en) * | 2016-05-16 | 2016-07-20 | 安徽恒兴镀锌有限公司 | Zinc plating technology achieving vibrating dezincification |
| CN106591757A (en) * | 2017-02-21 | 2017-04-26 | 丹阳市腾黄钢管镀锌有限责任公司 | Steel pipe hot-dip galvanizing automatic production line |
| CN108531839A (en) * | 2017-03-01 | 2018-09-14 | 梁晓翠 | A kind of environment-friendly type hot-dip galvanizing technique |
| CN111876708A (en) * | 2020-07-15 | 2020-11-03 | 杨吉 | Improved process for reducing zinc consumption of hot-dip galvanized steel pipe by controlling uniformity of zinc layer |
| CN112063946A (en) * | 2020-09-10 | 2020-12-11 | 江苏银河钢杆有限公司 | Improved galvanizing process for electric power pole |
| CN114657493A (en) * | 2022-05-05 | 2022-06-24 | 河北华熙管业有限公司 | Corrosion-resistant galvanized steel pipe and production method thereof |
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| JP2004307903A (en) * | 2003-04-03 | 2004-11-04 | Nippon Steel Corp | Method and apparatus for cooling hot dip galvanized steel strip |
| JP2007291473A (en) * | 2006-04-27 | 2007-11-08 | Nippon Steel Corp | Method for producing hot dip galvanized steel strip |
| CN101565804A (en) * | 2008-04-22 | 2009-10-28 | 宝山钢铁股份有限公司 | Galvanizing flux and preparation method thereof |
| CN201605313U (en) * | 2010-02-04 | 2010-10-13 | 广州联兴热镀锌有限公司 | Inner and outer synchronous blowing device for hot galvanizing of steel pipes |
| CN103668030A (en) * | 2012-09-07 | 2014-03-26 | 天津市标典金属工艺制品有限公司 | Improved hot galvanizing method of iron handicraft or furniture |
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Patent Citations (5)
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| JP2004307903A (en) * | 2003-04-03 | 2004-11-04 | Nippon Steel Corp | Method and apparatus for cooling hot dip galvanized steel strip |
| JP2007291473A (en) * | 2006-04-27 | 2007-11-08 | Nippon Steel Corp | Method for producing hot dip galvanized steel strip |
| CN101565804A (en) * | 2008-04-22 | 2009-10-28 | 宝山钢铁股份有限公司 | Galvanizing flux and preparation method thereof |
| CN201605313U (en) * | 2010-02-04 | 2010-10-13 | 广州联兴热镀锌有限公司 | Inner and outer synchronous blowing device for hot galvanizing of steel pipes |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105296998A (en) * | 2015-11-10 | 2016-02-03 | 首钢总公司 | Control method of surface cracks of passivated membrane of chromium-free passivated galvanized plate |
| CN105779921A (en) * | 2016-05-16 | 2016-07-20 | 安徽恒兴镀锌有限公司 | Zinc plating technology achieving vibrating dezincification |
| CN106591757A (en) * | 2017-02-21 | 2017-04-26 | 丹阳市腾黄钢管镀锌有限责任公司 | Steel pipe hot-dip galvanizing automatic production line |
| CN108531839A (en) * | 2017-03-01 | 2018-09-14 | 梁晓翠 | A kind of environment-friendly type hot-dip galvanizing technique |
| CN111876708A (en) * | 2020-07-15 | 2020-11-03 | 杨吉 | Improved process for reducing zinc consumption of hot-dip galvanized steel pipe by controlling uniformity of zinc layer |
| CN112063946A (en) * | 2020-09-10 | 2020-12-11 | 江苏银河钢杆有限公司 | Improved galvanizing process for electric power pole |
| CN114657493A (en) * | 2022-05-05 | 2022-06-24 | 河北华熙管业有限公司 | Corrosion-resistant galvanized steel pipe and production method thereof |
| CN114657493B (en) * | 2022-05-05 | 2024-02-13 | 河北华熙管业有限公司 | Corrosion-resistant galvanized steel pipe and production method thereof |
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| CN104152836B (en) | 2016-09-14 |
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