CN108570673A - 一种冷轧低碳钢无镍无亚硝酸盐常温磷化液及其配制方法 - Google Patents
一种冷轧低碳钢无镍无亚硝酸盐常温磷化液及其配制方法 Download PDFInfo
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 229910001209 Low-carbon steel Inorganic materials 0.000 title claims abstract description 21
- 239000007788 liquid Substances 0.000 title claims abstract description 18
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 title claims abstract description 16
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 14
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000008367 deionised water Substances 0.000 claims abstract description 20
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 20
- 238000004458 analytical method Methods 0.000 claims abstract description 16
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 11
- APUPEJJSWDHEBO-UHFFFAOYSA-P ammonium molybdate Chemical compound [NH4+].[NH4+].[O-][Mo]([O-])(=O)=O APUPEJJSWDHEBO-UHFFFAOYSA-P 0.000 claims abstract description 11
- 235000018660 ammonium molybdate Nutrition 0.000 claims abstract description 11
- 239000011609 ammonium molybdate Substances 0.000 claims abstract description 11
- 229940010552 ammonium molybdate Drugs 0.000 claims abstract description 11
- PPSSQRUPSRPZON-UHFFFAOYSA-N nitrobenzene;sodium Chemical compound [Na].[O-][N+](=O)C1=CC=CC=C1 PPSSQRUPSRPZON-UHFFFAOYSA-N 0.000 claims abstract description 11
- VKJKEPKFPUWCAS-UHFFFAOYSA-M potassium chlorate Chemical compound [K+].[O-]Cl(=O)=O VKJKEPKFPUWCAS-UHFFFAOYSA-M 0.000 claims abstract description 11
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 10
- MPPQGYCZBNURDG-UHFFFAOYSA-N 2-propionyl-6-dimethylaminonaphthalene Chemical compound C1=C(N(C)C)C=CC2=CC(C(=O)CC)=CC=C21 MPPQGYCZBNURDG-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000011787 zinc oxide Substances 0.000 claims abstract description 5
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 12
- 235000014692 zinc oxide Nutrition 0.000 claims description 10
- 235000014655 lactic acid Nutrition 0.000 claims description 7
- 239000002253 acid Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- KZDMWVBUOTWRDX-UHFFFAOYSA-J sodium cerium(3+) tetrahydroxide Chemical compound [OH-].[Na+].[Ce+3].[OH-].[OH-].[OH-] KZDMWVBUOTWRDX-UHFFFAOYSA-J 0.000 claims description 6
- RNWHGQJWIACOKP-UHFFFAOYSA-N zinc;oxygen(2-) Chemical class [O-2].[Zn+2] RNWHGQJWIACOKP-UHFFFAOYSA-N 0.000 claims description 6
- 231100000252 nontoxic Toxicity 0.000 claims description 2
- 230000003000 nontoxic effect Effects 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 238000004448 titration Methods 0.000 claims description 2
- JVTAAEKCZFNVCJ-REOHCLBHSA-N L-lactic acid Chemical compound C[C@H](O)C(O)=O JVTAAEKCZFNVCJ-REOHCLBHSA-N 0.000 claims 2
- ALRHLSYJTWAHJZ-UHFFFAOYSA-N 3-hydroxypropionic acid Chemical compound OCCC(O)=O ALRHLSYJTWAHJZ-UHFFFAOYSA-N 0.000 abstract description 4
- 238000005097 cold rolling Methods 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 150000002815 nickel Chemical class 0.000 abstract description 2
- 231100000053 low toxicity Toxicity 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 229910052738 indium Inorganic materials 0.000 description 4
- 229910021653 sulphate ion Inorganic materials 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010960 cold rolled steel Substances 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000357 carcinogen Toxicity 0.000 description 1
- 239000003183 carcinogenic agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 201000009240 nasopharyngitis Diseases 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910001453 nickel ion Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/40—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing molybdates, tungstates or vanadates
- C23C22/44—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing molybdates, tungstates or vanadates containing also fluorides or complex fluorides
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- Metallurgy (AREA)
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- Chemical Treatment Of Metals (AREA)
Abstract
本发明公开了一种冷轧低碳钢无镍无亚硝酸盐常温磷化液及其配制方法,取5.0~7.0g分析纯氧化锌,加入少量去离子水将其搅拌成糊状;加入分析纯磷酸15~25mL,剧烈搅拌直至溶液澄清;加入溶解后的柠檬酸3.8~4.2 g,充分搅拌;分别取氯酸钾1.8~2.2 g、钼酸铵0.4~0.6g、间硝基苯磺酸钠0.55~0.65g,各自用去离子水溶解后加入到上述溶液中,充分搅拌;称取2‑羟基丙酸0.25~0.35g,在搅拌下缓慢滴加至上述溶液中;加入氟硅酸钠0.5~0.8g,充分搅拌,得磷化液。该磷化液的游离酸度在2.5~5.5点之间,总酸度在40~45点之间。本发明从节能环保角度开发了一种高性能低毒低污染新型冷轧低碳钢无镍无亚硝酸盐常温磷化液,该磷化液不含镍盐和亚硝酸盐,降低了对环境的污染。
Description
技术领域
本发明属于冷轧低碳钢件的表面处理技术领域,尤其涉及一种冷轧低碳钢无镍无亚硝酸盐常温磷化液及其配制方法。
背景技术
改革开放以来,尤其是进入 21 世纪,我国的汽车工业得到了快速发展,汽车用户对车辆的性能要求也越来越高。随着资源节约型和环境友好型经济社会的发展以及汽车工业界3R(Reduce, Reuse, Recycle)战略的提出 ,对汽车板材用钢也提出了更高的要求。冷轧钢,因其具有良好的物理性能和机械性能,被广泛应用在汽车、家电、工业设备和工程机械的制造中,目前仍是汽车板材用钢的主流,在汽车用钢板中,目前热轧板占20%左右,冷轧板占80%左右。但冷轧钢与其他金属材料一样,存在着严重的腐蚀现象。据发达国家统计,每年因金属腐蚀造成的损失,约占其国民生产总值的4%以上,为减少损失,节约资源,世界各国均采用不同的方法来防止腐蚀,其中最重要的一种手段即为表面工程的方法,目前工业上较常用的冷轧钢表面处理方法有铬化处理和磷化处理技术。磷化处理在众多表面处理技术中占有重要的地位,铬化处理因制备过程中产生的 Cr6+为致癌物质,对人体和环境会造成严重的危害,已早就被欧盟等许多国家禁止,随着我国环境友好型经济社会的发展和对环境执法力度的加强,目前我国也已经禁止。再者,随着汽车用户对车辆性能要求的提高,对汽车涂装质量也提出了更高的要求,为了改善汽车板的涂装质量,提高基体与涂层的结合力,在涂装前也需要对汽车板材进行磷化处理。目前国内外汽车生产线上对汽车钢板的磷化处理仍普遍采用含 Zn2+、Mn2+、Ni2+的中温磷化处理方式,此类磷化方式含有重金属离子,处理温度较高,能耗大、沉渣量大;常温磷化虽然得到大规模推广应用,但其促进剂仍以亚硝酸盐和镍离子为主,产生有毒气体、污染环境,同时存在沉渣多、耐蚀性差等缺点。因此,为了降低传统磷化工艺对环境的污染,降低磷化工艺温度,节约能源,提高磷化膜层综合性能,迫切需要开发出一种低温节能、无毒无污染、快速成膜、高耐蚀性的磷化液。
发明内容
本发明本发明要解决的技术问题是提供一种冷轧低碳钢无镍无亚硝酸盐常温磷化液及其配制方法。
为解决上述技术问题,本发明包括:
氧化锌: 5.0~7.0g/L
磷酸: 15~25mL/L
2-羟基丙酸: 0.25~0.35g/L
间硝基苯磺酸钠: 0.55~0.65g/L
氯酸钾: 1.8~2.2 g/L
氟硅酸钠: 0.5~0.8g/L
钼酸铵: 0.4~0.6g/L
柠檬酸: 3.8~4.2 g/L
水: 余量。
优选的包括:
氧化锌: 6.0g/L
磷酸: 20mL/L
2-羟基丙酸: 0.3g/L
间硝基苯磺酸钠: 0.6g/L
氯酸钾: 2.0 g/L
氟硅酸钠: 0.75g/L
钼酸铵: 0.5g/L
柠檬酸: 4.0 g/L
水: 余量。
所述磷化液的游离酸度为2.5~5.5点。
所述磷化液的总酸度为40~45点。
所述磷化液的酸比为10.5~ 16.4。
本发明的配制方法,包括以下步骤:
(1)称取5.0~7.0g分析纯氧化锌置于搅拌容器中,加入少量去离子水将其搅拌成糊状;
(2)量取分析纯磷酸15~25mL,加入上述搅拌容器中,剧烈搅拌直至溶液澄清,称为②号溶液;
(3)称取柠檬酸3.8~4.2 g,用去离子水充分溶解后加入②号溶液中,并充分搅拌,得③号溶液;
(4)分别称取氯酸钾1.8~2.2 g、钼酸铵0.4~0.6g、间硝基苯磺酸钠0.55~0.65g,各自用去离子水溶解完全后均加入到③号溶液中,并充分搅拌,得④号溶液;
(5)称取2-羟基丙酸0.25~0.35g,在搅拌下缓慢滴加至④号溶液中,得到⑤号溶液;
(6)称取氟硅酸钠0.5~0.8g,加入⑤号溶液中,并充分搅拌,得磷化液。
所述的磷化液的游离酸度在2.5~5.5点之间,总酸度在40~45点之间。
所述的磷化液的游离酸度及总酸度由酸度调整剂调节,所述的酸度调整剂为分析纯氢氧化钠,分析纯氢氧化钠在酸度调整剂中的含量为90~110g/L,将酸度调整剂缓慢滴加至所述磷化液中,剧烈搅拌,采用化学滴定法频繁测定磷化液的游离酸度点数和总酸度点数,直至游离酸度在2.5~5.5点之间,总酸度在40~45点之间。
本发明以现代汽车用冷轧钢板为研究对象,从节能环保角度开发了一种高性能低毒低污染新型冷轧低碳钢无镍无亚硝酸盐常温磷化液。该磷化液不含镍盐和亚硝酸盐,降低了对环境的污染。通过扫描电镜SEM分析、XRD物相分析、电化学Tafel极化曲线、交流阻抗(EIS)图谱、中性盐雾实验等测试,表明:该磷化液能够在较低温度(25~35°C )下快速(7~10分钟) 在冷轧低碳钢表面获得性能优良的晶态磷化膜,各项性能均能达到国家标准,可以满足涂装行业需求,在汽车涂装行业具有较为广阔的市场应用前景。
具体实施方式
称取18~22g分析纯氢氧化钠,溶解于约200ml去离子水中,然后用500ml容量瓶定容,得酸度调整剂,分析纯氢氧化钠在酸度调整剂中的含量为90~110g/L。
实施例1
称取6.0g分析纯氧化锌置于搅拌容器中,加入少量去离子水将其搅拌成糊状;量取分析纯磷酸20mL,加入上述搅拌容器中,剧烈搅拌直至溶液澄清,称为②号溶液;称取柠檬酸4.0 g,用去离子水充分溶解后加入②号溶液中,并充分搅拌,得③号溶液;分别称取氯酸钾2.0 g、钼酸铵0.5g、间硝基苯磺酸钠0.6g,各自用去离子水溶解完全后均加入到③号溶液中,并充分搅拌,得④号溶液;称取2-羟基丙酸0.3g,在搅拌下缓慢滴加至④号溶液中,得到⑤号溶液;称取氟硅酸钠0.75g,加入⑤号溶液中,并充分搅拌,得磷化液;将酸度调整剂缓慢滴加至磷化液中,剧烈搅拌,直至游离酸度为2.57点,总酸度为42.18点,酸比为16.4。将冷轧低碳钢工件或试样置于上述磷化液中磷化9min后,形成的磷化膜其硫酸铜点滴试验时间为148 s。
实施例2
称取5.0g分析纯氧化锌置于搅拌容器中,加入少量去离子水将其搅拌成糊状;量取分析纯磷酸20mL,加入上述搅拌容器中,剧烈搅拌直至溶液澄清,称为②号溶液;称取柠檬酸4.2g,用去离子水充分溶解后加入②号溶液中,并充分搅拌,得③号溶液;分别称取氯酸钾2.0g、钼酸铵0.4g、间硝基苯磺酸钠0.65g,各自用去离子水溶解完全后均加入到③号溶液中,并充分搅拌,得④号溶液;称取2-羟基丙酸0.25g,在搅拌下缓慢滴加至④号溶液中,得到⑤号溶液;称取氟硅酸钠0.8g,加入⑤号溶液中,并充分搅拌,得磷化液;将酸度调整剂缓慢滴加至磷化液中,剧烈搅拌,直至游离酸度为4.12点,总酸度为43.21点,酸比为10.5。将冷轧低碳钢工件或试样置于上述磷化液中磷化10min后,形成的磷化膜其硫酸铜点滴试验时间为123s。
实施例3
称取6.0g分析纯氧化锌置于搅拌容器中,加入少量去离子水将其搅拌成糊状;量取分析纯磷酸15mL,加入上述搅拌容器中,剧烈搅拌直至溶液澄清,称为②号溶液;称取柠檬酸3.8g,用去离子水充分溶解后加入②号溶液中,并充分搅拌,得③号溶液;分别称取氯酸钾2.2 g、钼酸铵0.6g、间硝基苯磺酸钠0.55g,各自用去离子水溶解完全后均加入到③号溶液中,并充分搅拌,得④号溶液;称取2-羟基丙酸0.3g,在搅拌下缓慢滴加至④号溶液中,得到⑤号溶液;称取氟硅酸钠0.5g,加入⑤号溶液中,并充分搅拌,得磷化液;将酸度调整剂缓慢滴加至磷化液中,剧烈搅拌,直至游离酸度为2.51点,总酸度为40.16点,酸比为16。将冷轧低碳钢工件或试样置于上述磷化液中7min后,形成的磷化膜其硫酸铜点滴试验时间为137s。
实施例4
称取7.0g分析纯氧化锌置于搅拌容器中,加入少量去离子水将其搅拌成糊状;量取分析纯磷酸25mL,加入上述搅拌容器中,剧烈搅拌直至溶液澄清,称为②号溶液;称取柠檬酸4.0 g,用去离子水充分溶解后加入②号溶液中,并充分搅拌,得③号溶液;分别称取氯酸钾1.8g、钼酸铵0.5g、间硝基苯磺酸钠0.6g,各自用去离子水溶解完全后均加入到③号溶液中,并充分搅拌,得④号溶液;称取2~羟基丙酸0.35g,在搅拌下缓慢滴加至④号溶液中,得到⑤号溶液;称取氟硅酸钠0.75g,加入⑤号溶液中,并充分搅拌,得磷化液。将酸度调整剂缓慢滴加至磷化液中,剧烈搅拌,直至游离酸度为3.09点,总酸度为42.7点,酸比为13.8。将冷轧低碳钢工件或试样置于上述磷化液中7min后,形成的磷化膜其硫酸铜点滴试验时间为132s。
Claims (8)
1.一种冷轧低碳钢无镍无亚硝酸盐常温磷化液,其特征是包括:
氧化锌: 5.0~7.0g/L
磷酸: 15~25mL/L
2-羟基丙酸: 0.25~0.35g/L
间硝基苯磺酸钠: 0.55~0.65g/L
氯酸钾: 1.8~2.2 g/L
氟硅酸钠: 0.5~0.8g/L
钼酸铵: 0.4~0.6g/L
柠檬酸: 3.8~4.2 g/L
水: 余量。
2.根据权利要求1所述的冷轧低碳钢无镍无亚硝酸盐常温磷化液,其特征是包括:
氧化锌: 6.0g/L
磷酸: 20mL/L
2-羟基丙酸: 0.3g/L
间硝基苯磺酸钠: 0.6g/L
氯酸钾: 2.0 g/L
氟硅酸钠: 0.75g/L
钼酸铵: 0.5g/L
柠檬酸: 4.0 g/L
水: 余量。
3.根据权利要求1所述的冷轧低碳钢无镍无亚硝酸盐常温磷化液,其特征是所述磷化液的游离酸度为2.5~5.5点。
4.根据权利要求1所述的冷轧低碳钢无镍无亚硝酸盐常温磷化液,其特征是所述磷化液的总酸度为40~45点。
5. 根据权利要求1所述的冷轧低碳钢无镍无亚硝酸盐常温磷化液,其特征是所述磷化液的酸比为10.5~ 16.4。
6.一种冷轧低碳钢无镍无亚硝酸盐常温磷化液的配制方法,其特征是包括以下步骤:
(1)称取5.0~7.0g分析纯氧化锌置于搅拌容器中,加入少量去离子水将其搅拌成糊状;
(2)量取分析纯磷酸15~25mL,加入上述搅拌容器中,剧烈搅拌直至溶液澄清,称为②号溶液;
(3)称取柠檬酸3.8~4.2 g,用去离子水充分溶解后加入②号溶液中,并充分搅拌,得③号溶液;
(4)分别称取氯酸钾1.8~2.2 g、钼酸铵0.4~0.6g、间硝基苯磺酸钠0.55~0.65g,各自用去离子水溶解完全后均加入到③号溶液中,并充分搅拌,得④号溶液;
(5)称取2-羟基丙酸0.25~0.35g,在搅拌下缓慢滴加至④号溶液中,得到⑤号溶液;
(6)称取氟硅酸钠0.5~0.8g,加入⑤号溶液中,并充分搅拌,得磷化液。
7.根据权利要求6所述的冷轧低碳钢无镍无亚硝酸盐常温磷化液的配制方法,其特征是所述的磷化液的游离酸度在2.5~5.5点之间,总酸度在40~45点之间。
8.根据权利要求7所述的冷轧低碳钢表面覆盖常温无毒磷化膜的方法,其特征是所述的磷化液的游离酸度及总酸度由酸度调整剂调节,所述的酸度调整剂为分析纯氢氧化钠,分析纯氢氧化钠在酸度调整剂中的含量为90~110g/L,将酸度调整剂缓慢滴加至所述磷化液中,剧烈搅拌,采用化学滴定法频繁测定磷化液的游离酸度点数和总酸度点数,直至游离酸度在2.5~5.5点之间,总酸度在40~45点之间。
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