CN103572303B - A kind of steel chemical pre-processing method and pickle solution used - Google Patents
A kind of steel chemical pre-processing method and pickle solution used Download PDFInfo
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- CN103572303B CN103572303B CN201310507104.7A CN201310507104A CN103572303B CN 103572303 B CN103572303 B CN 103572303B CN 201310507104 A CN201310507104 A CN 201310507104A CN 103572303 B CN103572303 B CN 103572303B
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Abstract
The invention discloses a kind of steel chemical pre-processing method and pickle solution used, wherein steel chemical pre-processing method comprises: pickling-degreasing-washing-phosphatization four procedure, coarse grain alkali is adopted in degreasing fluid, in pickling and degreasing process, solve normal temperature technique to promoting agent requirement respectively with AES and APAM tensio-active agent, phosphatization adopts molybdate phosphating liquor of iron series.Acid solution composition used is counted with gram often liter: sulfuric acid: 101-135g/L, potassium sulfocyanate: 3g/L, triethylenetetramine hexaacetic acid: 3g/L, acetamidine hydrochloride: 3g/L, di-o-tolyl-thiourea: 3g/L, the mass concentration of sulfuric acid is 15% ~ 19%.This technique is simple, and operation passage is few, saves water about 80%.Without the need to indirect heating equipment, facility investment can be reduced, normal operation economize on electricity about 70%.
Description
Technical field
The present invention relates to the chemical pre-processing method technical field of steel, be specifically related to a kind of oil removing of steel, rust cleaning, phosphating process and pickle solution used.
Background technology
At normal steel chemistry Pretreatment Line, in the oil removing of steel, rust cleaning, parkerizing process, first the greasy dirt of steel surface remove before eliminating rust, and then pickling removes the corrosion of steel surface.Chemical transformation in degreasing tank has saponification reaction, emulsion reaction and complex reaction, enter degreasing fluid residual after pickling tank can with acid solution generation acid-base reaction, cause the parameter in pickling tank sharply to reduce.In addition, need after pickling completes to neutralize the residual acid radical ion of steel surface, then show tune, phosphatization.
At present, as shown in Figure 1, this chemical pre-treating technology flow process needs through pre-degreasing-degreasing-washing-pickling-washing-neutralization-table tune-phosphatization-washing for Some Domestic producer steel chemistry pre-treatment oil removing, rust cleaning, phosphating process flow process.Pre-degreasing, degreasing process mainly grease to chemically react the soap and glycerine that generate and can be dissolved in water with alkali, and this soap belongs to soap class, and this kind of reaction is also referred to as saponification reaction, and this quasi-grease is referred to as saponified oil.For ensureing that the usual tank liquor temperature of effect of process controls at 40 ~ 50 DEG C.Steel surface degreasing raffinate cleans up by washing step, avoids degreasing fluid and pickle solution generation neutralization reaction below.Pickling process temperature 35 ~ 45 DEG C, pickling time controls at 3 ~ 5min.To ensure after pickling that the acid ion of steel surface is all gone out before entering phosphatization operation, to ensure the stability of phosphatization.Enter neutralization after pickling, the acid ion of workpiece surface band and alkali generation neutralization reaction are generated the ironic hydroxide precipitated.The state of the whole workpiece surface of table key, improves the quality of phosphatize phosphate coat.Phosphatization procedure calls control temperature at 35 ~ 40 DEG C, time 3 ~ 5min.Phosphorization filming mechanism is: 8Fe+5Me (H
2pO
4)
2+ 8H
2o+H
3pO
4→ Me
2fe (PO
4)
24H
2o (film)+Me
3(PO
4) 4H
2o (film)+7FeHPO
4(sediment)+8H
2↑ wherein Me be Mn, Zn etc.Priority control steel surface carries the destruction of acid ion to phosphatization.When adopting this steel pre-treating technology to carry out the oil removing of steel surface, rust cleaning, phosphatization, operation is many, facility investment floor space is large, need to heat that energy consumption is high, running cost is high, and pre-treatment washing water consumption is large.For addressing this problem, technician attempts to adopt simple technical process, the method for normal temperature degreasing, pickling, phosphatization, reduces facility investment, floor space, reduces the running cost of chemical pre-treatment.
For solving the problems of the technologies described above, the invention provides the steel chemistry pretreatment technology that a kind of technical process is simple, equipment is simple, cost is low, solving tank liquor needs the problem of heating.And a kind of pickle solution is provided, stay the problem of the acid solution neutralization degreasing fluid below of steel surface after solving pickling.
Summary of the invention
The invention discloses the Simple process method of a kind of steel chemistry pre-treatment oil removing, rust cleaning, phosphatization, in degreasing in this processing method, pickling, washing and parkerizing process, tank liquor is without the need to heating, and carries out all at normal temperatures.And facility investment is few, floor space is little, and running cost is low.
For solving the problems of the technologies described above, the present invention adopts four procedures, and technical process is as follows:
Pickling-degreasing-washing-phosphatization
The described four procedure times are respectively: pickling 3-5min, degreasing: 3-5min, washing: 1min, phosphatization: 3-5min.
Above four procedures carry out all at normal temperatures.
The temperature range of described normal temperature is 5-30 DEG C.
In described degreasing process, adopt coarse grain alkali in degreasing fluid used, technical grade purity is greater than 99%, both can make sour neutralization reagent and use, can work as grease-removing agent alkaline matter again; In degreasing fluid, paper mill wastewater is 25 ~ 45%.
The tensio-active agent adopted in pickling process is negatively charged ion polyoxyethylenated alcohol sodium sulfate, and in acid solution, concentration is 10g/L.
The tensio-active agent adopted in degreasing process is anionic polyacrylamide, and in degreasing fluid, mass concentration is 0.1% ~ 0.5%, solves normal temperature technique to promoting agent requirement.
Phosphatization adopts molybdate phosphating liquor of iron series, and phosphatize phosphate coat just can be made complete without the need to heating up, the indexs such as erosion resistance will reach requirement.
The chemical constitution of pickle solution used is counted with gram often liter:
The mass concentration of sulfuric acid used is 15% ~ 19%.
Present invention process is simple, and operation is few, saves water about 80%.Without the need to indirect heating equipment, facility investment can be reduced, normal operation economize on electricity about 70%.And workpiece phosphatization is effective, reach anticorrosion process requirement.
Accompanying drawing explanation
Fig. 1 is the steel surface pre-treating technology schematic flow sheet of prior art;
Fig. 2 is a kind of steel chemistry pre-treating technology schematic flow sheet disclosed by the invention.
Embodiment:
Below in conjunction with embodiment, the present invention is described in further detail:
Negatively charged ion polyoxyethylenated alcohol sodium sulfate manufacturer of the present invention is Zhejiang Province ZanYu Technology Co., Ltd.
The manufacturer of anionic polyacrylamide of the present invention is Henan Shuan Yuan Environmental Protection Technology Co., Ltd.
The manufacturer of coarse grain alkali of the present invention is grow into forest Chemical Co., Ltd. in Shandong Guangrao County.
Molybdate phosphating liquor of iron series manufacturer of the present invention is Changzhou Run Dong Chemical Co., Ltd..
Embodiment 1:
Preparating acid washing lotion:
The mass concentration of sulfuric acid used is 19%.
Workpiece soaks 5min in 30 DEG C of pickle solutions prepared, and in pickle solution, Anionic Surfactant polyoxyethylenated alcohol sodium sulfate concentration is 10g/L, and metal primary colors is exposed in the corrosion Ex-all of steel surface, drop liquid 2min; Enter 30 DEG C of degreasing fluids and soak 3min, in degreasing fluid containing mass concentration be 25% coarse grain alkali and mass concentration be the anionic polyacrylamide of 0.5%, after going out groove, workpiece surface moisture film is even, drop liquid 2min; Enter washing step, temperature 30 DEG C, soak 1min, drop liquid 1min; Enter 30 DEG C of molybdate phosphating liquor of iron series and soak 3min, the workpiece surface after process is colored.
Embodiment 2:
Preparating acid washing lotion:
The mass concentration of sulfuric acid used is 17%.
Workpiece is prepared soak 4min in pickle solution the institute of 18 DEG C, and in pickle solution, the concentration of Anionic Surfactant polyoxyethylenated alcohol sodium sulfate is 10g/L, and metal primary colors is exposed in the corrosion Ex-all of steel surface, drop liquid 2min; Enter 18 DEG C of degreasing fluids and soak 4min, in degreasing fluid containing mass concentration be 35% coarse grain alkali and mass concentration be the anionic polyacrylamide of 0.3%, after going out groove, workpiece surface moisture film is even, drop liquid 2min; Enter washing step, temperature 18 DEG C, soak 1min, drop liquid 1min; Enter 18 DEG C of molybdate phosphating liquor of iron series and soak 4min, the workpiece surface after process is colored.
Embodiment 3:
Preparating acid washing lotion:
The mass concentration of sulfuric acid used is 15%.
Workpiece soaks 3min in the pickle solution prepared of 5 DEG C, and in pickle solution, the concentration of Anionic Surfactant polyoxyethylenated alcohol sodium sulfate is 10g/L, and metal primary colors is exposed in the corrosion Ex-all of steel surface, drop liquid 2min; Enter 5 DEG C of degreasing tank immersions bubble 5min, in degreasing fluid containing mass concentration be 45% coarse grain alkali and mass concentration be the anionic polyacrylamide of 0.1%, after going out groove, workpiece surface moisture film is even, drop liquid 2min; Enter washing step, temperature 5 DEG C, soak 1min, drop liquid 1min; Enter 5 DEG C of molybdate phosphating liquor of iron series and soak 5min, the workpiece surface after process is colored.
Claims (9)
1. a steel chemical pre-processing method, is characterized in that comprising four procedures: pickling-degreasing-washing-phosphatization; Described four procedures carry out at 5-30 DEG C.
2. steel chemical pre-processing method according to claim 1, is characterized in that the described four procedure times are respectively: pickling: 3-5min, degreasing: 3-5min, washing: 1min, phosphatization: 3-5min.
3. steel chemical pre-processing method according to claim 1, is characterized in that: adopt coarse grain alkali in described degreasing process, technical grade purity is greater than 99%.
4. steel chemical pre-processing method according to claim 1, is characterized in that: in described degreasing process degreasing fluid used, the mass concentration of alkali is 25 ~ 45%.
5. steel chemical pre-processing method according to claim 1, is characterized in that: adopt tensio-active agent to be negatively charged ion polyoxyethylenated alcohol sodium sulfate in pickling process, concentration is 10g/L.
6. steel chemical pre-processing method according to claim 1, is characterized in that: adopt tensio-active agent to be anionic polyacrylamide in degreasing process, mass concentration counts 0.1% ~ 0.5%.
7. steel chemical pre-processing method according to claim 1, is characterized in that: phosphatization adopts molybdate phosphating liquor of iron series.
8. the pickle solution that a kind of steel chemical pre-processing method according to claim 1 is used, is characterized in that each component concentration in pickle solution is:
Sulfuric acid: 101-135g/L
Potassium sulfocyanate: 3g/L
Triethylenetetramine hexaacetic acid: 3g/L
Acetamidine hydrochloride: 3g/L
Di-o-tolyl-thiourea: 3g/L.
9. pickle solution according to claim 8, is characterized in that: the mass concentration of sulfuric acid used is 15% ~ 19%.
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| CN201310507104.7A CN103572303B (en) | 2013-10-24 | 2013-10-24 | A kind of steel chemical pre-processing method and pickle solution used |
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| CN103572303B true CN103572303B (en) | 2015-11-25 |
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| IT1288407B1 (en) * | 1996-12-09 | 1998-09-22 | Sviluppo Materiali Spa | METHOD FOR PICKLING METAL ALLOY PRODUCTS CONTAINING IRON AND TITANIUM AND ITS ALLOYS |
| CN101812679A (en) * | 2009-02-20 | 2010-08-25 | 江苏省金鑫安防设备有限公司 | Surface treatment process of steel plate |
| CN101671825B (en) * | 2009-10-13 | 2011-05-18 | 广东联塑科技实业有限公司 | Pre-treating technique for composite metal plastic pipe |
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