CN103898579A - Zinc dipping solution of electroplating chromium on surface of magnesium alloy die casting - Google Patents
Zinc dipping solution of electroplating chromium on surface of magnesium alloy die casting Download PDFInfo
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- CN103898579A CN103898579A CN201310217469.6A CN201310217469A CN103898579A CN 103898579 A CN103898579 A CN 103898579A CN 201310217469 A CN201310217469 A CN 201310217469A CN 103898579 A CN103898579 A CN 103898579A
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- magnesium alloy
- zinc
- die casting
- alloy die
- zincate solution
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Abstract
The invention discloses a zinc dipping solution of electroplating chromium on the surface of a magnesium alloy die casting. The zinc dipping solution comprises the following components: 20-28g/L of zinc sulfate, 9-15g/L of zinc carbonate, 200-210g/L of potassium pyrophosphate, 8-12g/L of sodium carbonate, 2-6g/L of potassium fluoride, 2-6g/L of ammonium bifluoride and the balance of water.
Description
Technical field
The present invention relates to electroplating technology field, relate in particular to a kind of zincate solution of magnesium alloy die casting electroplating Cr onto surface.
Background technology
Magnesium alloy is described as the green metal structured material of 21 century, has that density is low, a specific tenacity and specific rigidity is high and damping and amortization, machinability, castability are superior, in automotive industry, space flight and aviation industry, electronic industry, has obtained increasingly extensive application.Magnesium raw material is abundant, and in natural resources, in the 8th, but as structured material, its solidity to corrosion is poor has restricted the major cause that it uses widely.
The Standard Electrode Potentials of magnesium is-2.34V, there is very high reactive behavior, in air or solution, magnesium alloy can generate one deck passive film as thin as a wafer very soon, thereby while causing plating or electroless plating, metal plating and magnesium substrate adhesion are not strong, do not reach service requirements, in addition according to known to the observation of magnesium alloy materials metal structure, magnesium alloy is to form α phase by purity compared with high magnesium, and the β being formed by alloy ingredient forms mutually, wherein β order skewness and electromotive force are higher than α phase, therefore Mg alloy surface Potential Distributing inequality, galvanic corrosion easily occurs in treatment solution makes Mg alloy surface plating or electroless plating become difficulty, therefore wish obtains the metal plating with good combination power, before plating and electroless plating, must first carry out special pre-treatment to remove surperficial passive film and segregation layer to magnesium alloy materials, to obtain one evenly, clean surface.
Surface pretreatment common method based on magnesium alloy plating or electroless plating has at present: Dow
[1]the zinc method of the soaking technique of company exploitation, main flow process is: oil removing → anode cleaning → acid etching → acid activation → soak zinc → cyanide electroplating.On this basis, constantly improve, as Olsen
[2]the Norsk-Hydro technique proposing: oil removing → acid etching → alkaline purification → soak zinc → cyanide electroplating, Dennis
[3]wCM technique is proposed: oil removing → acid etching → acid activation → soak zinc → cyanide electroplating.In these pre-treating technology plating solutions, contain hypertoxic prussiate, the liquid waste disposal expense of generation is high.
Under the pressure of increasingly serious resources and environment protection; carrying out the researchs of magnesium metallic substance and anti-corrosion method thereof is one of urgent task of world's Sustainable development; although obtaining interim progress aspect magnesium alloy protection in recent years; and be applied in certain field, but still there is no to form the method that can replace traditional magnesium alloy plating completely.Therefore the electroplating technology that, hope can be developed a kind of environmental protection meets the production requirement of modern clean energy-saving.
Magnesium alloy die casting has been widely used in the fields such as automobile, traffic, aerospace, and wherein the application of some die casting needs surface that electrolytic coating is set, but the report about the electroplating technology of magnesium alloy die casting in prior art is little.And before electrodeposited chromium, conventionally need to soak zinc operation, and be beneficial to follow-up nickel plating and chrome-plated process, therefore, the effect of soaking zinc will directly affect the coating performance of electrodeposited chromium.
Summary of the invention
The object of the invention is to propose a kind of zincate solution of magnesium alloy die casting electroplating Cr onto surface, by the adjustment to zincate solution component, obtain the good zinc processing layer that soaks, for subsequent handling provides good basis.
For reaching this object, the present invention by the following technical solutions:
A zincate solution for magnesium alloy die casting electroplating Cr onto surface, described zincate solution consists of: zinc sulfate 20-28g/L, zinc carbonate 9-15g/L, potassium pyrophosphate 200-210g/L, sodium carbonate 8-12g/L, Potassium monofluoride 2-6g/L; Ammonium bifluoride 2-6g/L, surplus is water.
Preferably, described zincate solution consists of: zinc sulfate 22-26g/L, zinc carbonate 11-13g/L, potassium pyrophosphate 203-207g/L, sodium carbonate 9-11g/L, Potassium monofluoride 3-5g/L; Ammonium bifluoride 3-5g/L, surplus is water.
Most preferably, described zincate solution consists of: zinc sulfate 24g/L, zinc carbonate 12g/L, potassium pyrophosphate 205g/L, sodium carbonate 10g/L, Potassium monofluoride 4g/L; Ammonium bifluoride 4g/L, surplus is water.
The present invention has advantages of:
By the adjustment to zincate solution component, obtain the good zinc processing layer that soaks, for subsequent technique is laid a good foundation, the chromium coating bonding force of final preparation is strong.
Embodiment
Embodiment mono-
A zincate solution for magnesium alloy die casting electroplating Cr onto surface, described zincate solution consists of: zinc sulfate 20g/L, zinc carbonate 15g/L, potassium pyrophosphate 200g/L, sodium carbonate 12g/L, Potassium monofluoride 2g/L; Ammonium bifluoride 6g/L, surplus is water.
Embodiment bis-
A zincate solution for magnesium alloy die casting electroplating Cr onto surface, described zincate solution consists of: zinc sulfate 28g/L, zinc carbonate 9g/L, potassium pyrophosphate 210g/L, sodium carbonate 8g/L, Potassium monofluoride 6g/L; Ammonium bifluoride 2g/L, surplus is water.
Embodiment tri-
A zincate solution for magnesium alloy die casting electroplating Cr onto surface, described zincate solution consists of: zinc sulfate 22g/L, zinc carbonate 13g/L, potassium pyrophosphate 203g/L, sodium carbonate 11g/L, Potassium monofluoride 3g/L; Ammonium bifluoride 5g/L, surplus is water.
Embodiment tetra-
A zincate solution for magnesium alloy die casting electroplating Cr onto surface, described zincate solution consists of: zinc sulfate 26g/L, zinc carbonate 11g/L, potassium pyrophosphate 207g/L, sodium carbonate 9g/L, Potassium monofluoride 5g/L; Ammonium bifluoride 3g/L, surplus is water.
Embodiment five
A zincate solution for magnesium alloy die casting electroplating Cr onto surface, described zincate solution consists of: zinc sulfate 24g/L, zinc carbonate 12g/L, potassium pyrophosphate 205g/L, sodium carbonate 10g/L, Potassium monofluoride 4g/L; Ammonium bifluoride 4g/L, surplus is water.
Claims (3)
1. a zincate solution for magnesium alloy die casting electroplating Cr onto surface, is characterized in that, described zincate solution consists of: zinc sulfate 20-28g/L, zinc carbonate 9-15g/L, potassium pyrophosphate 200-210g/L, sodium carbonate 8-12g/L, Potassium monofluoride 2-6g/L; Ammonium bifluoride 2-6g/L, surplus is water.
2. the zincate solution of a kind of magnesium alloy die casting electroplating Cr onto surface as claimed in claim 1, is characterized in that, described zincate solution consists of: zinc sulfate 22-26g/L, zinc carbonate 11-13g/L, potassium pyrophosphate 203-207g/L, sodium carbonate 9-11g/L, Potassium monofluoride 3-5g/L; Ammonium bifluoride 3-5g/L, surplus is water.
3. the zincate solution of a kind of magnesium alloy die casting electroplating Cr onto surface as claimed in claim 2, is characterized in that, described zincate solution consists of: zinc sulfate 24g/L, zinc carbonate 12g/L, potassium pyrophosphate 205g/L, sodium carbonate 10g/L, Potassium monofluoride 4g/L; Ammonium bifluoride 4g/L, surplus is water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310217469.6A CN103898579A (en) | 2013-06-03 | 2013-06-03 | Zinc dipping solution of electroplating chromium on surface of magnesium alloy die casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310217469.6A CN103898579A (en) | 2013-06-03 | 2013-06-03 | Zinc dipping solution of electroplating chromium on surface of magnesium alloy die casting |
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| CN103898579A true CN103898579A (en) | 2014-07-02 |
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| CN201310217469.6A Pending CN103898579A (en) | 2013-06-03 | 2013-06-03 | Zinc dipping solution of electroplating chromium on surface of magnesium alloy die casting |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2654702A (en) * | 1948-09-03 | 1953-10-06 | Dow Chemical Co | Electrodepostion of metal from alkaline cyanide bath |
| US3152009A (en) * | 1962-05-17 | 1964-10-06 | Dow Chemical Co | Electroless nickel plating |
| CN1598059A (en) * | 2004-08-05 | 2005-03-23 | 广州杰赛科技股份有限公司 | Magnesium alloy non cyanogen plating copper chemical plating nickle and its plating process |
| CN1598053A (en) * | 2004-08-05 | 2005-03-23 | 湖南大学 | Plating solution of magnesium alloy nickle sulfate main salt and technology of chemical plating thereof |
| CN101153388A (en) * | 2006-09-28 | 2008-04-02 | 比亚迪股份有限公司 | Plating liquid for electroless zinc plating for magnesium alloy |
-
2013
- 2013-06-03 CN CN201310217469.6A patent/CN103898579A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2654702A (en) * | 1948-09-03 | 1953-10-06 | Dow Chemical Co | Electrodepostion of metal from alkaline cyanide bath |
| US3152009A (en) * | 1962-05-17 | 1964-10-06 | Dow Chemical Co | Electroless nickel plating |
| CN1598059A (en) * | 2004-08-05 | 2005-03-23 | 广州杰赛科技股份有限公司 | Magnesium alloy non cyanogen plating copper chemical plating nickle and its plating process |
| CN1598053A (en) * | 2004-08-05 | 2005-03-23 | 湖南大学 | Plating solution of magnesium alloy nickle sulfate main salt and technology of chemical plating thereof |
| CN101153388A (en) * | 2006-09-28 | 2008-04-02 | 比亚迪股份有限公司 | Plating liquid for electroless zinc plating for magnesium alloy |
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Application publication date: 20140702 |
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