CN115216762B - 一种通用于镁合金的化学磷化方法 - Google Patents
一种通用于镁合金的化学磷化方法 Download PDFInfo
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- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 235000010344 sodium nitrate Nutrition 0.000 claims description 6
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- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 3
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 3
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- 239000011609 ammonium molybdate Substances 0.000 claims description 3
- APUPEJJSWDHEBO-UHFFFAOYSA-P ammonium molybdate Chemical compound [NH4+].[NH4+].[O-][Mo]([O-])(=O)=O APUPEJJSWDHEBO-UHFFFAOYSA-P 0.000 claims description 3
- 229940010552 ammonium molybdate Drugs 0.000 claims description 3
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- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
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- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims description 3
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- 229910000162 sodium phosphate Inorganic materials 0.000 claims description 3
- 229940048086 sodium pyrophosphate Drugs 0.000 claims description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 3
- 239000004094 surface-active agent Substances 0.000 claims description 3
- 235000019818 tetrasodium diphosphate Nutrition 0.000 claims description 3
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 3
- 229960001124 trientine Drugs 0.000 claims description 3
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 5
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 abstract description 4
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- 238000005254 chromizing Methods 0.000 description 2
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- 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
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- 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
- C23C22/42—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 phosphates
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Abstract
本发明公开了一种通用于镁合金的化学磷化方法,包括:超声波除油步骤,将镁合金工件放入超声波清洗设备的超声波溶液中进行超声波除油;酸洗步骤,在室温条件下,将除油后的镁合金工件放入酸洗溶液中进行酸洗处理;表调步骤,将酸洗后的镁合金工件放入表调溶液中进行化学表面调整处理;磷化步骤,在室温条件下,将表调后的镁合金工件放入磷化溶液中进行磷化处理;干燥步骤,将磷化后的镁合金工件置于烘干炉中进行干燥处理。本发明的通用于镁合金的化学磷化方法对于镁合金的牌号无任何要求,所使用的各种处理溶液不含有六价铬,利用本发明的磷化方法处理后的镁合金上所形成的磷化膜耐盐雾性能可达24~30H,大大提高了镁合金的耐蚀性能。
Description
技术领域
本发明属于金属材料表面处理技术领域,具体涉及一种通用于镁合金的化学磷化方法。
背景技术
镁合金具有重量轻、散热好、减震性强、电磁屏蔽效率高等优点,在电子及汽车领域的应用越来越广泛。但镁合金具有较高的化学活泼性,使得其耐蚀性不好。因此,通常需要对镁合金表面进行处理以形成化学氧化膜,以提高镁合金的耐蚀性能。
现有技术中,对镁合金表面进行处理以形成化学氧化膜的常用方式包括铬化、磷化、陶化,其中,铬化由于使用六价铬,对环境污染大,使用越来越少,而磷化及陶化,由于其氧化液的性质,使得陶化或者磷化只能针对某些特定牌号的镁合金,在处理不同牌号镁合金时,需要切换不同的磷化或陶化工艺,对工业生产不利。
因此,研发一种通用于镁合金的化学磷化方法,以适用于各种牌号镁合金的磷化,是本领域亟需解决的技术问题。
发明内容
为了解决以上技术问题,本发明提供一种通用于镁合金的化学磷化方法,包括如下工艺步骤:
超声波除油步骤:将镁合金工件放入超声波清洗设备的超声波溶液中进行超声波除油,去除镁合金工件表面油污;
酸洗步骤:在室温条件下,将除油后的镁合金工件放入酸洗溶液中进行酸洗处理,去除镁合金工件表面的氧化皮;
表调步骤:将酸洗后的镁合金工件放入表调溶液中进行化学表面调整处理;
磷化步骤:在室温条件下,将表调后的镁合金工件放入磷化溶液中进行磷化处理;
干燥步骤:将磷化后的镁合金工件置于烘干炉中进行干燥处理,直至完全干燥。
进一步地,在上述通用于镁合金的化学磷化方法中,在所述超声波除油步骤中,超声波溶液包括40~50g/L的氢氧化钠、10~15g/L的磷酸钠、5~10g/L的碳酸钠,超声波溶液的温度控制为55~75℃,超声波除油持续时间控制为15~30min。
进一步地,在上述通用于镁合金的化学磷化方法中,在所述酸洗步骤中,酸洗溶液包括10~15ml/L的硝酸、2~6g/L的钼酸铵、10~20g/L的硝酸钠。
进一步地,在上述通用于镁合金的化学磷化方法中,在所述酸洗步骤中,酸洗溶液置于具有抽风装置的耐酸槽中。
进一步地,在上述通用于镁合金的化学磷化方法中,在所述表调步骤中,表调溶液包括5~10g/L的焦磷酸钠、5~10g/L的柠檬酸钠、3~5g/L的乙二胺四乙酸二钠(EDTA-2Na)、10~30ml/L的双氧水、2~8ml/L的三乙烯四胺、1~5ml/L的三乙醇胺、10~20g/L的氢氧化钠、5~10g/L的表面活性剂,表调溶液的PH值控制为12~14,表调溶液的温度控制为80~90℃。
进一步地,在上述通用于镁合金的化学磷化方法中,在所述表调步骤中,表调溶液置于带有抽风装置的耐酸碱槽中。
进一步地,在上述通用于镁合金的化学磷化方法中,在所述磷化步骤中,磷化溶液包括10~35g/L的磷酸、6~10g/L的碳酸钙、0.2~0.4g/L的硫脲、0.5~3g/L的偏钒酸钠、0.5~2g/L的硅酸钠、1~3g/L的硝酸钠、0.5~3g/L的十二烷基磺酸钠,磷化溶液的PH值控制为2.0~3.5,磷化处理时间控制为1~5min。
进一步地,在上述通用于镁合金的化学磷化方法中,在所述磷化步骤中,磷化溶液置于耐酸槽中。
进一步地,在上述通用于镁合金的化学磷化方法中,在所述干燥步骤中,干燥温度控制为80~150℃、干燥时间控制为10~20min。
进一步地,在上述通用于镁合金的化学磷化方法中,在带有通风装置的烘干炉中进行所述干燥步骤。
与现有技术相比,本发明的通用于镁合金的化学磷化方法具有如下优点和有益效果:
本发明的通用于镁合金的化学磷化方法对于镁合金的牌号无任何要求,可以在任何牌号的镁合金上形成致密的磷化膜,显著降低了镁合金由于材料成份区别而带来的工艺生产和管理成本,增强了市场竞争;
本发明的通用于镁合金的化学磷化方法中所使用的各种处理溶液不含有六价铬,因而不会产生环保安全问题,可广泛使用在各种工业领域;
经实际检测,利用本发明的磷化方法处理后的镁合金上所形成的磷化膜耐盐雾性能可达24~30H,远高于现有技术中磷化膜6~12H的耐盐雾性能,大大提高了镁合金的耐蚀性能。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。
图1为本发明的通用于镁合金的化学磷化方法的工艺流程图。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚,下面将结合本发明具体实施例对本发明技术方案进行清楚、完整地描述。显然,所描述的实施例仅是本发明的一部分实施例,而不是全部的实施例。基于本发明的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
如图1所示,本发明的通用于镁合金的化学磷化方法包括如下工艺步骤:
超声波除油步骤:将镁合金工件放入超声波清洗设备的超声波溶液中进行超声波除油,以去除镁合金工件表面油污;
酸洗步骤:在室温条件下,将除油后的镁合金工件放入酸洗溶液中进行酸洗处理,以去除镁合金工件表面的氧化皮;
表调步骤:将酸洗后的镁合金工件放入表调溶液中进行化学表面调整处理;
磷化步骤:在室温条件下,将表调后的镁合金工件放入磷化溶液中进行磷化处理;
干燥步骤:将磷化后的镁合金工件置于烘干炉中进行干燥处理,直至完全干燥。
作为一种具体实施方式,在超声波除油步骤中,超声波溶液包括40~50g/L的氢氧化钠、10~15g/L的磷酸钠、5~10g/L的碳酸钠,超声波溶液的温度控制为55~75℃,超声波除油持续时间控制为15~30min。
作为一种具体实施方式,在酸洗步骤中,酸洗溶液包括10~15ml/L的硝酸、2~6g/L的钼酸铵、10~20g/L的硝酸钠。
优选地,在酸洗步骤中,酸洗溶液置于具有抽风装置的耐酸槽中。
作为一种具体实施方式,在表调步骤中,表调溶液包括5~10g/L的焦磷酸钠、5~10g/L的柠檬酸钠、3~5g/L的乙二胺四乙酸二钠(EDTA-2Na)、10~30ml/L的双氧水、2~8ml/L的三乙烯四胺、1~5ml/L的三乙醇胺、10~20g/L的氢氧化钠、5~10g/L的表面活性剂,表调溶液的PH值控制为12~14,表调溶液的温度控制为80~90℃。
优选地,在表调步骤中,表调溶液置于带有抽风装置的耐酸碱槽中。
作为一种具体实施方式,在磷化步骤中,磷化溶液包括10~35g/L的磷酸、6~10g/L的碳酸钙、0.2~0.4g/L的硫脲、0.5~3g/L的偏钒酸钠、0.5~2g/L的硅酸钠、1~3g/L的硝酸钠、0.5~3g/L的十二烷基磺酸钠,磷化溶液的PH值控制为2.0~3.5,磷化处理时间控制为1~5min。
优选地,在磷化步骤中,磷化溶液置于耐酸槽中。
作为一种具体实施方式,在干燥步骤中,干燥温度控制为80~150℃、干燥时间控制为10~20min。
优选地,在干燥步骤中,在带有通风装置的烘干炉中进行干燥处理。
本发明的通用于镁合金的化学磷化方法对于镁合金的牌号无任何要求,可以在任何牌号的镁合金上形成致密的磷化膜,显著降低了镁合金由于材料成份区别而带来的工艺生产和管理成本,增强了市场竞争力。而且,本发明的通用于镁合金的化学磷化方法中所使用的各种处理溶液不含有六价铬,因而不会产生环保安全问题,可广泛使用在各种工业领域。此外,经实际检测,利用本发明的磷化方法处理后的镁合金上所形成的磷化膜耐盐雾性能可达24~30H,远高于现有技术中磷化膜6~12H的耐盐雾性能,大大提高了镁合金的耐蚀性能。
需要说明的是,在本文中,术语“包括”或者其任何其他变体意在涵盖非排他性的包含,从而使得包括一系列要素的物品或者设备不仅包括那些要素,而且还包括没有明确列出的其他要素,或者是还包括为这种物品或者设备所固有的要素。
还需要说明的是,以上实施例仅用于说明本发明的技术方案,而非对其限制;尽管参照前述实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本发明的范围。
Claims (6)
1.一种通用于镁合金的化学磷化方法,其特征在于,所述通用于镁合金的化学磷化方法包括如下工艺步骤:
超声波除油步骤:将镁合金工件放入超声波清洗设备的超声波溶液中进行超声波除油,去除镁合金工件表面油污;
酸洗步骤:在室温条件下,将除油后的镁合金工件放入酸洗溶液中进行酸洗处理,去除镁合金工件表面的氧化皮;
表调步骤:将酸洗后的镁合金工件放入表调溶液中进行化学表面调整处理;
磷化步骤:在室温条件下,将表调后的镁合金工件放入磷化溶液中进行磷化处理;
干燥步骤:将磷化后的镁合金工件置于烘干炉中进行干燥处理,直至完全干燥;
在所述超声波除油步骤中,超声波溶液包括40~50g/L的氢氧化钠、10~15g/L的磷酸钠、5~10g/L的碳酸钠,超声波溶液的温度控制为55~75℃,超声波除油持续时间控制为15~30min;
在所述酸洗步骤中,酸洗溶液包括10~15ml/L的硝酸、2~6g/L的钼酸铵、10~20g/L的硝酸钠;
在所述表调步骤中,表调溶液包括5~10g/L的焦磷酸钠、5~10g/L的柠檬酸钠、3~5g/L的乙二胺四乙酸二钠、10~30ml/L的双氧水、2~8ml/L的三乙烯四胺、1~5ml/L的三乙醇胺、10~20g/L的氢氧化钠、5~10g/L的表面活性剂,表调溶液的pH值控制为12~14,表调溶液的温度控制为80~90℃;
在所述磷化步骤中,磷化溶液包括10~35g/L的磷酸、6~10g/L的碳酸钙、0.2~0.4g/L的硫脲、0.5~3g/L的偏钒酸钠、0.5~2g/L的硅酸钠、1~3g/L的硝酸钠、0.5~3g/L的十二烷基磺酸钠,磷化溶液的pH值控制为2.0~3.5,磷化处理时间控制为1~5min;
处理后的镁合金上所形成的磷化膜耐盐雾性能达24~30H。
2.如权利要求1所述的通用于镁合金的化学磷化方法,其特征在于,在所述酸洗步骤中,酸洗溶液置于具有抽风装置的耐酸槽中。
3.如权利要求1所述的通用于镁合金的化学磷化方法,其特征在于,在所述表调步骤中,表调溶液置于带有抽风装置的耐酸碱槽中。
4.如权利要求1所述的通用于镁合金的化学磷化方法,其特征在于,在所述磷化步骤中,磷化溶液置于耐酸槽中。
5.如权利要求1所述的通用于镁合金的化学磷化方法,其特征在于,在所述干燥步骤中,干燥温度控制为80~150℃、干燥时间控制为10~20min。
6.如权利要求5所述的通用于镁合金的化学磷化方法,其特征在于,在带有通风装置的烘干炉中进行所述干燥步骤。
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