CN113355672A - 一种铝合金墩压件的电镀工艺 - Google Patents
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 68
- 238000003825 pressing Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000009713 electroplating Methods 0.000 title claims abstract description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 146
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 73
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 53
- 239000011701 zinc Substances 0.000 claims abstract description 53
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 53
- 238000000151 deposition Methods 0.000 claims abstract description 34
- 238000005266 casting Methods 0.000 claims abstract description 25
- 238000005530 etching Methods 0.000 claims abstract description 19
- 238000007747 plating Methods 0.000 claims abstract description 18
- 239000002253 acid Substances 0.000 claims abstract description 10
- 230000008021 deposition Effects 0.000 claims description 32
- 239000000126 substance Substances 0.000 claims description 31
- 239000000243 solution Substances 0.000 claims description 30
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 12
- 239000012670 alkaline solution Substances 0.000 claims description 12
- 229910017604 nitric acid Inorganic materials 0.000 claims description 12
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 239000011574 phosphorus Substances 0.000 claims description 9
- 229910052698 phosphorus Inorganic materials 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 238000001556 precipitation Methods 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 238000003486 chemical etching Methods 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000002161 passivation Methods 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- QELJHCBNGDEXLD-UHFFFAOYSA-N nickel zinc Chemical compound [Ni].[Zn] QELJHCBNGDEXLD-UHFFFAOYSA-N 0.000 description 2
- 241000784732 Lycaena phlaeas Species 0.000 description 1
- DOBRDRYODQBAMW-UHFFFAOYSA-N copper(i) cyanide Chemical compound [Cu+].N#[C-] DOBRDRYODQBAMW-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000017260 vegetative to reproductive phase transition of meristem Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Abstract
本发明公开了一种铝合金墩压件的电镀工艺,它包括以下步骤:S1、有机除油;S2、碱蚀;S3、酸蚀;S4、第一次沉锌;S5、退锌;S6、第二次沉锌;S7、基础镍层的形成;S8、将步骤S7中的铝合金墩压件浸入到枪黑镍溶液中,以在基础镍层上镀出底镍。本发明的有益效果是:提高镀层结合力、防脱层、清洗效果好、能够镀出亚光黑。
Description
技术领域
本发明涉及铝合金墩压件镀镍的技术领域,特别是一种铝合金墩压件的电镀工艺。
背景技术
在铝合金上电镀镍层的工艺是先对铝合金墩压件进行酸洗,以除去掉铝合金墩压件上油污,清洗后通过以下两种工艺在铝合金墩压件上镀基础镍层:其中一种工艺是先在铝合金墩压件上镀氰化碱铜,再镀普通铜,再进行电镀镍,虽然能够镀基础镍层,但是此工艺复杂,工序多,易产生各种电镀质量问题,包括脱层问题,镀层发花问题等;另一种工艺是直接化学镀镍,此工艺简单,但对化学镍污染大,易造成化学镍溶液迅速分解,使产品结晶粗糙发花斑点脱层等,后期在改进中增加了一个小型的预镀化学镍槽,虽然降低了加厚化学镍槽的污染,但预镀化学镍槽维护也成问题,几乎天天新配溶液,溶液不稳定;当基础镍层镀上后,采用铝合金镀黑镍溶液或锌镍体系在基础镍层上镀底层镍,从而实现铝合金墩压件的电镀。其中,当铝合金墩压件清洗后,直接进行镀基础镍层,造成基础镍层与铝合金墩压件的结合力差,容易脱层。此外,铝合金镀黑镍溶液或锌镍体系无法得到亚光黑的产品。
发明内容
本发明的目的在于克服现有技术的缺点,提供一种提高镀层结合力、防脱层、清洗效果好、能够镀出亚光黑的铝合金墩压件的电镀工艺。
本发明的目的通过以下技术方案来实现:一种铝合金墩压件的电镀工艺,它包括以下步骤:
S1、有机除油:通过有机溶液清除掉铝合金墩压件表面上的机加工油;
S2、碱蚀:将铝合金墩压件浸入到碱性溶液中,并向碱性溶液中通入超声波,碱性溶液中除去铝合金墩压件表面的油污、钝化层及不溶性物质,同时对铝合金墩压件表面进行化学蚀刻,蚀刻后形成微观腐蚀的表面;
S3、酸蚀:将铝合金墩压件浸入到稀硝酸溶液中,并向稀硝酸溶液中通入超声波,稀硝酸溶液除去铝合金墩压件表面上的挂灰,提高基材表面光洁度;
S4、第一次沉锌:将铝合金墩压件浸入无氰沉锌剂中,在铝合金墩压件的表面上置换一层沉锌层A;
S5、退锌:将步骤S4中的铝合金墩压件浸入稀硝酸溶液中,通过酸蚀除去沉锌层A;
S6、第二次沉锌:将步骤S5中的铝合金墩压件浸入无氰沉锌剂中,第二次沉锌后,在铝合金墩压件的表面上置换一层均匀细致、结合力好的沉锌层B;
S7、基础镍层的形成:将步骤S6中的铝合金墩压件浸入到碱性常温化学镍中,以在沉锌层B上形成一层化学镍层;将铝合金墩压件浸入高磷化学镍中,以在化学镍层的基础上形成一层高磷化学镍层;在高磷化学镍层的基础上镀上一层雾镍,从而在沉锌层B的基础上镀基础镍层;
S8、将步骤S7中的铝合金墩压件浸入到枪黑镍溶液中,以在基础镍层上镀出底镍。
所述碱性溶液为氢氧化钠碱蚀液。
所述沉锌层B为含有铜、铁、镍的致密均匀的锌层。
所述步骤S8结束后,对铝合金墩压件进行24h盐雾实验。
本发明具有以下优点:
1、本发明通过2次沉锌效果比1次沉锌效果好,1次沉锌结晶层粗糙,结合力也较差,通过酸蚀除去1次沉锌层,再进行第2次沉锌后结晶层均匀细致,也比较薄,在后面的化学镀镍过程结合力很好,避免了出现脱层现象。
2、沉锌后直接浸碱性常温化学镍,再化学沉镍,操作简单,溶液也很稳定,结合力优良。
3、枪黑镍溶液能够在基础镍层的底层上镀出亚光黑的镍层,从而满足了用户的需求。
附图说明
图1 为本发明的工艺流程图。
具体实施方式
下面结合附图对本发明做进一步的描述,本发明的保护范围不局限于以下所述:
如图1所示,一种铝合金墩压件的电镀工艺,它包括以下步骤:
S1、有机除油:通过有机溶液清除掉铝合金墩压件表面上的机加工油;
S2、碱蚀:将铝合金墩压件浸入到碱性溶液中,并向碱性溶液中通入超声波,碱性溶液中除去铝合金墩压件表面的油污、钝化层及不溶性物质,同时对铝合金墩压件表面进行化学蚀刻,蚀刻后形成微观腐蚀的表面;
S3、酸蚀:将铝合金墩压件浸入到稀硝酸溶液中,并向稀硝酸溶液中通入超声波,稀硝酸溶液除去铝合金墩压件表面上的挂灰,提高基材表面光洁度;
S4、第一次沉锌:将铝合金墩压件浸入无氰沉锌剂中,在铝合金墩压件的表面上置换一层沉锌层A;
S5、退锌:将步骤S4中的铝合金墩压件浸入稀硝酸溶液中,通过酸蚀除去沉锌层A;
S6、第二次沉锌:将步骤S5中的铝合金墩压件浸入无氰沉锌剂中,第二次沉锌后,在铝合金墩压件的表面上置换一层均匀细致、结合力好的沉锌层B;通过2次沉锌效果比1次沉锌效果好,1次沉锌结晶层粗糙,结合力也较差,通过酸蚀除去1次沉锌层,再进行第2次沉锌后结晶层均匀细致,也比较薄,在后面的化学镀镍过程结合力很好,避免了出现脱层现象。
S7、基础镍层的形成:将步骤S6中的铝合金墩压件浸入到碱性常温化学镍中,以在沉锌层B上形成一层化学镍层;将铝合金墩压件浸入高磷化学镍中,以在化学镍层的基础上形成一层高磷化学镍层;在高磷化学镍层的基础上镀上一层雾镍,从而在沉锌层B的基础上镀基础镍层;沉锌后直接浸碱性常温化学镍,再化学沉镍,操作简单,溶液也很稳定,结合力优良。
S8、将步骤S7中的铝合金墩压件浸入到枪黑镍溶液中,以在基础镍层上镀出底镍。枪黑镍溶液能够在基础镍层的底层上镀出亚光黑的镍层,从而满足了用户的需求。
所述碱性溶液为氢氧化钠碱蚀液。所述沉锌层B为含有铜、铁、镍的致密均匀的锌层。所述步骤S8结束后,对铝合金墩压件进行24h盐雾实验。
最后应说明的是:以上所述仅为本发明的优选实施例而已,并不用于限制本发明,尽管参照前述实施例对本发明进行了详细的说明,对于本领域的技术人员来说,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。凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (4)
1.一种铝合金墩压件的电镀工艺,其特征在于:它包括以下步骤:
S1、有机除油:通过有机溶液清除掉铝合金墩压件表面上的机加工油;
S2、碱蚀:将铝合金墩压件浸入到碱性溶液中,并向碱性溶液中通入超声波,碱性溶液中除去铝合金墩压件表面的油污、钝化层及不溶性物质,同时对铝合金墩压件表面进行化学蚀刻,蚀刻后形成微观腐蚀的表面;
S3、酸蚀:将铝合金墩压件浸入到稀硝酸溶液中,并向稀硝酸溶液中通入超声波,稀硝酸溶液除去铝合金墩压件表面上的挂灰,提高基材表面光洁度;
S4、第一次沉锌:将铝合金墩压件浸入无氰沉锌剂中,在铝合金墩压件的表面上置换一层沉锌层A;
S5、退锌:将步骤S4中的铝合金墩压件浸入稀硝酸溶液中,通过酸蚀除去沉锌层A;
S6、第二次沉锌:将步骤S5中的铝合金墩压件浸入无氰沉锌剂中,第二次沉锌后,在铝合金墩压件的表面上置换一层均匀细致、结合力好的沉锌层B;
S7、基础镍层的形成:将步骤S6中的铝合金墩压件浸入到碱性常温化学镍中,以在沉锌层B上形成一层化学镍层;将铝合金墩压件浸入高磷化学镍中,以在化学镍层的基础上形成一层高磷化学镍层;在高磷化学镍层的基础上镀上一层雾镍,从而在沉锌层B的基础上镀基础镍层;
S8、将步骤S7中的铝合金墩压件浸入到枪黑镍溶液中,以在基础镍层上镀出底镍。
2.根据权利要求1所述的一种铝合金墩压件的电镀工艺,其特征在于:所述碱性溶液为氢氧化钠碱蚀液。
3.根据权利要求1所述的一种铝合金墩压件的电镀工艺,其特征在于:所述沉锌层B为含有铜、铁、镍的致密均匀的锌层。
4.根据权利要求1所述的一种铝合金墩压件的电镀工艺,其特征在于:所述步骤S8结束后,对铝合金墩压件进行24h盐雾实验。
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