CN110714219A - Method for electroplating nickel on magnesium alloy micro-arc oxidation surface - Google Patents
Method for electroplating nickel on magnesium alloy micro-arc oxidation surface Download PDFInfo
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- CN110714219A CN110714219A CN201911063704.2A CN201911063704A CN110714219A CN 110714219 A CN110714219 A CN 110714219A CN 201911063704 A CN201911063704 A CN 201911063704A CN 110714219 A CN110714219 A CN 110714219A
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- 238000007745 plasma electrolytic oxidation reaction Methods 0.000 title claims abstract description 55
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 45
- 238000009713 electroplating Methods 0.000 title claims abstract description 37
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 22
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052709 silver Inorganic materials 0.000 claims abstract description 15
- 239000004332 silver Substances 0.000 claims abstract description 15
- 239000007921 spray Substances 0.000 claims abstract description 8
- 238000005507 spraying Methods 0.000 claims abstract description 8
- 239000000919 ceramic Substances 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 230000008569 process Effects 0.000 claims abstract description 4
- 230000009471 action Effects 0.000 claims abstract description 3
- 238000010891 electric arc Methods 0.000 claims abstract description 3
- 239000002923 metal particle Substances 0.000 claims abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 6
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 6
- PLKATZNSTYDYJW-UHFFFAOYSA-N azane silver Chemical compound N.[Ag] PLKATZNSTYDYJW-UHFFFAOYSA-N 0.000 claims description 6
- 239000003792 electrolyte Substances 0.000 claims description 4
- 238000007747 plating Methods 0.000 claims description 4
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims description 3
- -1 NaAlO 2 Substances 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 239000008103 glucose Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 abstract description 15
- 230000007797 corrosion Effects 0.000 abstract description 13
- 229910052751 metal Inorganic materials 0.000 abstract description 6
- 239000002184 metal Substances 0.000 abstract description 6
- 238000004381 surface treatment Methods 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000005536 corrosion prevention Methods 0.000 abstract 1
- 238000000576 coating method Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 229910021389 graphene Inorganic materials 0.000 description 4
- 229910052749 magnesium Inorganic materials 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910001961 silver nitrate Inorganic materials 0.000 description 2
- 206010070834 Sensitisation Diseases 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000009699 differential effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008313 sensitization Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/30—Anodisation of magnesium or alloys based thereon
-
- 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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/1601—Process or apparatus
- C23C18/1633—Process of electroless plating
- C23C18/1655—Process features
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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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/31—Coating with metals
- C23C18/42—Coating with noble metals
- C23C18/44—Coating with noble metals using reducing agents
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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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
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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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
- C23C28/322—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only
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- 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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
- C23C28/345—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with at least one oxide layer
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- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/026—Anodisation with spark discharge
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/12—Electroplating: Baths therefor from solutions of nickel or cobalt
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- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
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Abstract
本发明涉及一种镁合金微弧氧化表面电镀镍的方法，属于金属表面防腐蚀技术领域。在微弧氧化涂覆镁合金表面施加电镀镍，镁合金在高电压作用下，氧化膜被击穿，并在高温下被熔化，产生微弧放电现象，形成陶瓷氧化层；处理后的样品通过银镜反应利用喷涂装置在多孔的微弧氧化膜表面涂覆一层银金属颗粒使表面导电；在完成喷银处理后进行直流电镀在表面形成镀镍层。优点在于：在镁合金微弧氧化表面喷银后电镀镍不必进行复杂的传统镁合金电镀的表面处理过程，既提高了生产的效率又避免了重金属污染。同时陶瓷层的绝缘特性也进一步提升了腐蚀性能。本发明的微弧氧化涂覆镁合金表面施加电镀镍的方法，可快速、简单、方便的微弧氧化表面制备电镀镍膜层。The invention relates to a method for electroplating nickel on the surface of magnesium alloy micro-arc oxidation, and belongs to the technical field of metal surface corrosion prevention. Electroplating nickel is applied to the surface of the magnesium alloy coated by micro-arc oxidation. Under the action of high voltage, the oxide film of the magnesium alloy is broken down and melted at high temperature, resulting in the phenomenon of micro-arc discharge and the formation of a ceramic oxide layer; the treated sample passes through In the silver mirror reaction, a spraying device is used to coat a layer of silver metal particles on the surface of the porous micro-arc oxidation film to make the surface conductive; after the silver spray treatment is completed, DC electroplating is performed to form a nickel-plated layer on the surface. The advantages are: after spraying silver on the surface of the magnesium alloy micro-arc oxidation, the nickel electroplating does not need to carry out the complex surface treatment process of the traditional magnesium alloy electroplating, which not only improves the production efficiency but also avoids heavy metal pollution. At the same time, the insulating properties of the ceramic layer further improve the corrosion performance. The method for applying electroplating nickel on the surface of the magnesium alloy coated by the micro-arc oxidation of the present invention can quickly, simply and conveniently prepare the electro-nickel film on the surface of the micro-arc oxidation.
Description
技术领域technical field
本发明涉及金属表面防腐蚀技术领域，特别涉及一种镁合金表面微弧氧化快速电镀镍的技术，尤指一种镁合金微弧氧化表面电镀镍的方法。The invention relates to the technical field of anti-corrosion of metal surfaces, in particular to a technology for rapid nickel electroplating by micro-arc oxidation on the surface of magnesium alloys, in particular to a method for electroplating nickel on the surface of magnesium alloys by micro-arc oxidation.
背景技术Background technique
镁是地壳第八大最丰富的元素，因此有足够的资源保证其合金在各个工程领域的使用。镁合金已被证明具有最高的比强度，这种优异的力学性能满足节能减排的需求；镁合金还具有出色的阻尼能力，这种性能可广泛应用于3C产品；对环境和人体无毒（镁合金是可生物降解植入物的理想选择之一）。镁合金具有出色的铸造性，允许通过高生产率的方法（例如高压压铸）制造复杂的形状。除此之外镁合金易于通过高速铣削和车削进行加工成型。镁合金易被腐蚀的特性使用镁合金仍然明显受到限制。众多金属应用领域中,耐腐蚀是一个很重要的参数。镁具有低的化学活性，25℃时的标准电极电势-2.363V，比铁低约1.9V，比铝低约 0.7V，是所有结构金属中最低的。镁及其合金表面形成的氧化膜(Mg O)不能成为致密的保护膜。镁还存在负差数效应，当与阴极性金属或组元接触时腐蚀加剧。Magnesium is the eighth most abundant element in the earth's crust, so there are enough resources to warrant its alloys' use in various engineering fields. Magnesium alloy has been proven to have the highest specific strength, and this excellent mechanical property meets the needs of energy saving and emission reduction; magnesium alloy also has excellent damping capacity, which can be widely used in 3C products; non-toxic to the environment and human body ( Magnesium alloys are one of the ideal choices for biodegradable implants). Magnesium alloys have excellent castability, allowing complex shapes to be fabricated by high-productivity methods such as high-pressure die casting. In addition, magnesium alloys are easy to form by high-speed milling and turning. The corrosion-susceptible properties of magnesium alloys are still significantly limited in the use of magnesium alloys. Corrosion resistance is an important parameter in many metal applications. Magnesium has low chemical activity, with a standard electrode potential of -2.363V at 25°C, which is about 1.9V lower than iron and about 0.7V lower than aluminum, the lowest among all structural metals. The oxide film (MgO) formed on the surface of magnesium and its alloys cannot be a dense protective film. Magnesium also has a negative differential effect, which increases corrosion when in contact with cathodic metals or components.
研究合理、经济的镁合金防腐蚀方法有着重大的现实意义。众所周知，在腐蚀防护中表面处理是最为简单直接的方式，如何快速的在镁合金表面得到结合性良好并且可以提升其耐腐蚀的表面涂层是这个问题的关键。近些年来，人们开发了微弧氧化和金属电镀等方式来提高镁合金的耐腐蚀性能。虽然微弧氧化涂层具有许多理想的特性，例如与基材的粘结强度高，耐磨性好。但其表面还有许多微孔和裂纹，这些会大大降低耐腐蚀性。电镀要求试样的表面具有导电性。因此这两种手段都存在一定的局限性。It is of great practical significance to study a reasonable and economical method for corrosion protection of magnesium alloys. As we all know, surface treatment is the most simple and direct way in corrosion protection. How to quickly obtain a surface coating with good bonding on the surface of magnesium alloy and can improve its corrosion resistance is the key to this problem. In recent years, micro-arc oxidation and metal electroplating have been developed to improve the corrosion resistance of magnesium alloys. While micro-arc oxidation coatings have many desirable properties, such as high bond strength to the substrate and good abrasion resistance. However, there are still many micropores and cracks on the surface, which will greatly reduce the corrosion resistance. Electroplating requires that the surface of the specimen be electrically conductive. Therefore, both methods have certain limitations.
尚伟等人在专利【CN109898122A】中，配制微弧氧化液后对预处理后的镁合金进行微弧氧化形成微弧氧化膜，利用直流电源，微弧氧化处理后的镁合金为正极，镁合金片为负极，在氧化石墨烯电解液中进行电沉积。最后，取出正极镁合金样品得到镁合金表面微弧氧化/氧化石墨烯复合膜层。这项发明的方法所制备的复合膜层表面均匀平整，存在有氧化石墨烯典型的褶皱结构，并具有较低的腐蚀电流密度，能够较好的提高镁合金的耐蚀性能。上述方法虽然可以有效提高镁合金微弧氧化膜层的耐腐蚀性，但由于氧化石墨烯价格昂贵，无法在工厂推广使用。In the patent [CN109898122A], Shang Wei et al. prepared the micro-arc oxidation solution and performed micro-arc oxidation on the pretreated magnesium alloy to form a micro-arc oxidation film. The alloy sheet is the negative electrode, which is electrodeposited in the graphene oxide electrolyte. Finally, the positive magnesium alloy sample was taken out to obtain the micro-arc oxidation/graphene oxide composite film on the surface of the magnesium alloy. The surface of the composite film prepared by the method of the invention is uniform and smooth, has a typical wrinkle structure of graphene oxide, and has a low corrosion current density, which can better improve the corrosion resistance of magnesium alloys. Although the above method can effectively improve the corrosion resistance of the magnesium alloy micro-arc oxidation film, it cannot be popularized and used in factories due to the high price of graphene oxide.
宋仁国等人在中国专利【CN107460481A】中公开了一种镁合金微弧氧化与化学镀镍复合涂层的制备方法,对镁合金基体进行表面微弧氧化,形成微弧氧化陶瓷膜层。室温下将微弧氧化之后的镁合金基体放入敏化处理之后在硝酸银溶液中进行活化处理。处理后进行化学镀镍。所述微弧氧化加化学镀镍复合涂层的缺陷远少于传统微弧氧化膜层的缺陷,提高了耐腐蚀性能。但此过程对表面洁净要求高，需要浸入硝酸银溶液。化学镀镍要求温度高，需要耗能高，实验操作复杂。Song Renguo et al. disclosed a preparation method of magnesium alloy micro-arc oxidation and electroless nickel-plating composite coating in Chinese patent [CN107460481A]. The magnesium alloy substrate is subjected to surface micro-arc oxidation to form a micro-arc oxidation ceramic film. The magnesium alloy substrate after micro-arc oxidation was put into sensitization treatment at room temperature and then activated in a silver nitrate solution. Electroless nickel plating is performed after treatment. The defects of the micro-arc oxidation and electroless nickel-plated composite coating are far less than those of the traditional micro-arc oxidation coating, and the corrosion resistance is improved. However, this process requires high surface cleanliness and needs to be immersed in silver nitrate solution. Electroless nickel plating requires high temperature, high energy consumption, and complicated experimental operations.
发明内容SUMMARY OF THE INVENTION
本发明的目的在于提供一种镁合金微弧氧化表面电镀镍的方法，解决了现有技术存在的上述问题。本发明利用银镜反应，在微弧氧化件表面喷涂一层银颗粒。喷涂完成后进行电镀，结合了微弧氧化膜层与电镀膜层的优势，为镁合金防腐蚀提供了一种快速高效的处理方法。The purpose of the present invention is to provide a method for electroplating nickel on the surface of magnesium alloy micro-arc oxidation, which solves the above-mentioned problems existing in the prior art. The invention utilizes the silver mirror reaction to spray a layer of silver particles on the surface of the micro-arc oxidation part. Electroplating is carried out after spraying, which combines the advantages of the micro-arc oxidation film layer and the electroplating film layer, and provides a fast and efficient treatment method for magnesium alloy anti-corrosion.
本发明的上述目的通过以下技术方案实现：The above-mentioned purpose of the present invention is achieved through the following technical solutions:
镁合金微弧氧化表面电镀镍的方法，镁合金在高电压作用下，氧化膜被击穿，并在高温下被熔化，产生微弧放电现象，形成陶瓷氧化层；处理后的样品通过银镜反应利用喷涂装置在多孔的微弧氧化膜表面涂覆一层银金属颗粒使表面导电；在完成喷银处理后进行直流电镀在表面形成镀镍层。包括以下步骤：The method of electroplating nickel on the surface of magnesium alloy by micro-arc oxidation. Under the action of high voltage, the oxide film of magnesium alloy is broken down and melted at high temperature, resulting in the phenomenon of micro-arc discharge and the formation of ceramic oxide layer; the treated sample passes through the silver mirror The reaction uses a spraying device to coat a layer of silver metal particles on the surface of the porous micro-arc oxidation film to make the surface conductive; after the silver spraying treatment is completed, DC electroplating is performed to form a nickel-plated layer on the surface. Include the following steps:
步骤（1）将试样通过镁合金机械抛光的方式去除表面的氧化膜并除油，准备做微弧氧化处理；Step (1) Remove the oxide film and oil on the surface of the sample by mechanical polishing of magnesium alloy, and prepare for micro-arc oxidation treatment;
步骤（2）配制微弧氧化电解液，NaAlO2，KF，Na3C6H5O7·2H2O，NaOH，将试样置于微弧氧化设备阳极，不锈钢电解槽作为阴极，恒压模式下微弧氧化加工15分钟，终止电压在440V；Step (2) Prepare micro-arc oxidation electrolyte, NaAlO 2 , KF, Na 3 C 6 H 5 O 7 2H 2 O, NaOH, place the sample on the anode of micro-arc oxidation equipment, stainless steel electrolytic cell as cathode, constant pressure Micro-arc oxidation processing in the mode for 15 minutes, the termination voltage is 440V;
步骤（3）将微弧氧化完成的试样进行干燥并配置银氨溶液，设置两个空瓶分别盛放银氨溶液与葡萄糖溶液；采用喷涂装置，将空瓶溶液混合喷涂到试样的表面；Step (3) Dry the sample after micro-arc oxidation and configure silver ammonia solution, set two empty bottles to hold silver ammonia solution and glucose solution respectively; use a spraying device to mix and spray the empty bottle solution onto the surface of the sample ;
步骤（4）完成喷涂的试样进行去离子水冲洗，配置电镀镍溶液，将试样浸入电镀液中进行电镀镍处理。在微弧氧化表面进行喷银处理，因而镁合金微弧氧化表面形成了一层银颗粒从而表面有一定的导电性；存在导电性后使得电镀处理顺利进行。In step (4), the sprayed sample is rinsed with deionized water, a nickel electroplating solution is prepared, and the sample is immersed in the electroplating solution for nickel electroplating treatment. The micro-arc oxidation surface is sprayed with silver, so a layer of silver particles is formed on the surface of the magnesium alloy micro-arc oxidation, so that the surface has a certain electrical conductivity; after the electrical conductivity exists, the electroplating treatment can be carried out smoothly.
本发明的有益效果在于：在镁合金微弧氧化表面喷银后电镀镍不必进行复杂的传统镁合金电镀的表面处理过程，既提高了生产的效率又避免了重金属污染。同时陶瓷层的绝缘特性也进一步提升了腐蚀性能。本发明的微弧氧化涂覆镁合金表面施加电镀镍的方法，可快速、简单、方便的微弧氧化表面制备电镀镍膜层。The beneficial effect of the present invention is that: after spraying silver on the surface of the magnesium alloy micro-arc oxidation, the nickel electroplating does not need to carry out the complicated surface treatment process of the traditional magnesium alloy electroplating, which not only improves the production efficiency but also avoids heavy metal pollution. At the same time, the insulating properties of the ceramic layer further improve the corrosion performance. The method for applying electroplating nickel on the surface of the magnesium alloy coated by the micro-arc oxidation of the present invention can quickly, simply and conveniently prepare the electro-nickel film on the surface of the micro-arc oxidation.
具体实施方式Detailed ways
本发明的镁合金微弧氧化表面电镀镍的方法，镁合金在进行微弧氧化处理后形成陶瓷氧化层；将样品进行悬挂，进行表面喷银处理；取出样品，烘干浸入电镀槽中进行电镀镍处理。包括以下步骤：In the method for electroplating nickel on the surface of magnesium alloy by micro-arc oxidation, the magnesium alloy is subjected to micro-arc oxidation to form a ceramic oxide layer; the sample is suspended, and the surface is sprayed with silver; the sample is taken out, dried and immersed in an electroplating tank for electroplating Nickel treatment. Include the following steps:
步骤（1）将尺寸为30×10×3mm的试样通过镁合金机械抛光的方式去除表面的氧化膜并除油，准备做微弧氧化处理；Step (1) Remove the oxide film and oil on the surface of the sample with a size of 30×10×3mm by mechanical polishing of magnesium alloy, and prepare for micro-arc oxidation treatment;
步骤（2）配制微弧氧化电解液，NaAlO2，KF，Na3C6H5O7·2H2O，NaOH，将试样置于微弧氧化设备阳极，不锈钢电解槽作为阴极，恒压模式下微弧氧化加工15分钟，终止电压在440V；Step (2) Prepare micro-arc oxidation electrolyte, NaAlO 2 , KF, Na 3 C 6 H 5 O 7 2H 2 O, NaOH, place the sample on the anode of micro-arc oxidation equipment, stainless steel electrolytic cell as cathode, constant pressure Micro-arc oxidation processing in the mode for 15 minutes, the termination voltage is 440V;
步骤（3）将微弧氧化完成的试样进行干燥并配置银氨溶液，设置两个空瓶分别盛放银氨溶液与葡萄糖溶液。采用喷涂装置，将空瓶溶液混合喷涂到试样的表面。Step (3) Dry the sample after the micro-arc oxidation and prepare the silver ammonia solution, and set two empty bottles to hold the silver ammonia solution and the glucose solution respectively. Using a spray device, mix the solution from the empty bottle and spray it onto the surface of the sample.
步骤（4）完成喷涂的试样进行去离子水冲洗，配置电镀镍溶液，将试样浸入电镀液中进行电镀镍处理。In step (4), the sprayed sample is rinsed with deionized water, a nickel electroplating solution is prepared, and the sample is immersed in the electroplating solution for nickel electroplating treatment.
以上所述仅为本发明的优选实例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡对本发明所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。The above descriptions are only preferred examples of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made to the present invention shall be included within the protection scope of the present invention.
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