CN104178755A - Coating method for metal coating - Google Patents
Coating method for metal coating Download PDFInfo
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- CN104178755A CN104178755A CN201410473533.1A CN201410473533A CN104178755A CN 104178755 A CN104178755 A CN 104178755A CN 201410473533 A CN201410473533 A CN 201410473533A CN 104178755 A CN104178755 A CN 104178755A
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- coating method
- plating solution
- chemical plating
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Abstract
The invention discloses a coating method for a metal coating. The coating method comprises the following steps: (1) spraying a first chemical plating solution on the surface of a substrate to be coated, thereby plating a first metal coating; (2) washing the surface which coated with the first metal layer, and subsequently performing secondary chemical plating in a second chemical plating solution containing a relatively gentle reduction agent, wherein the first chemical plating solution contains 5-10g/L stannous mono-sulphate, 10-20g/L sodium borohydride, 20-40g/L aluminum chloride, 15-25g/L citric acid, 20-50g/L sulfur dioxide, 0.01-0.05g/L polyethylene glycol and 0.5-1.0g/L gelatin. By adopting the coating method, the service life of an electroplating liquid can be prolonged, and electric leakage or short circuit can be also avoided when the coating method is used.
Description
Technical field
The present invention relates to a kind of metal working process, relate in particular to a kind of coating method of metal plating.
Background technology
Known manufacture polymkeric substance and the method for other plastic material are that polymkeric substance or the plastic material of liquid phase after heating are cooled down in a mould, to form the object with this mold shape.Conventionally, the mould of manufacturing plastic object is made by heat treated metal.The surface of this mould is coated with various coating, with the plastic object of guaranteeing to make, can successfully from mould, spin off.A kind of known coating is titanium nitride.
When manufacturing epoxy polymer, this polymkeric substance can be more prone to be bonded at than other polymkeric substance the surface of mould.So bonding in order to reduce, known method is at the thin chromium metal of the plated surface last layer of mould.Typical method of coating is to use the technology of electroplating, and this coating is also referred to as " hard chrome " coating sometimes.
In ideal conditions, this hard chromium should be thin and be plated in equably the surface of material.Yet the existing problem of existing hard chromium technology, is exactly at material surface everywhere, coating is also inhomogeneous.When this material is used to mfg. moulding die, this is a typical problem.
Inhomogeneous coating, comes from the corner of material surface and the electrical effect of intersection.These electrical effects caused the corner of material surface and intersection coating more, and the planar section coating of material surface is less.Alleviate a kind of method of this problem, redesign exactly the shape of mould, inhomogeneous like this coating just can not cause the difficulty of plastic shaping, the difficulty that for example mould dangles and causes.Yet in order to solve the problem of plating, and any specific redesign to mould adopting is all undesirable, because such work is not only time-consuming but also difficult.
Another known problem relevant with hard chromium is that, although hard chromium has less viscosity than other coating, for forming polymer, desirable coating should have less viscosity.In addition, the process of plating tends to produce a chromium coating that contains micropore.Consequently, the density of this coating is the 70-80% of chromium metal density.In order to realize intact, a smooth coating, such density needs to improve.
The hardness of durionise coating, normally between 8Gpa and 10Gpa.For a lot of application, its hardness needs to improve.
Sputter coating technology also can be used to chromium plating on mould, but same, and these technology can produce inhomogeneous, low-density coating, such coating, when starting or through after a period of time, can become very sticky, its result is exactly that plastic substance is difficult to spin off from mould.
Therefore, the coating method of the new metal plating of necessary exploitation.
Summary of the invention
The object of the invention is to provide a kind of coating method of metal plating.Coating method of the present invention can extend the work-ing life of electroplate liquid, also can avoid electric leakage or short circuit during application.
The coating method of metal plating provided by the present invention, comprises the steps:
A coating method for metal plating, comprises the steps:
(1) matrix surface that the first chemical plating solution is sprayed on to precoating plates the first metal plating;
(2) surface washing that applies the first metal layer is clean, then in the second chemical plating solution that contains gentleer reductive agent, carry out second step electroless plating;
Described the first chemical plating solution contains stannous sulfate 5～10g/L, such as being 6g/L, 7.5g/L, 9g/L etc., sodium borohydride 10～20g/L, such as being 12g/L, 14g/L, 16g/L, 19g/L etc.; Aluminum chloride 20～40g/L, such as being 22g/L, 25g/L, 28g/L, 31g/L, 36g/L, 38g/L etc.; Citric acid 15～25g/L, such as being 16g/L, 19g/L, 23g/L etc.; Sulfurous gas 20-50g/L, such as being 23g/L, 26g/L, 28g/L, 32g/L, 37g/L, 44g/L, 48g/L etc.; Polyoxyethylene glycol 0.01-0.05g/L, such as being 0.02g/L, 0.04g/L etc.; Gelatin 0.5～1.0g/L, such as being 0.7g/L, 0.9g/L etc.
The object of the first step electroless plating is promptly in base metal surface, to generate using the second step electroless plating of gentleer reducing power reductive agent to have the flash plating of katalysis.The coating that obtains required thickness is almost completed by second step electroless plating completely.Because second step chemical plating solution is not used powerful reductive agent, greatly extended the life-span of chemical plating fluid, two or seven kings have avoided generating in plating solution metallic particles and have been deposited on the danger that causes electric leakage or short circuit on metallic surface.
As optimal technical scheme, coating method of the present invention, described the first chemical plating solution contains stannous sulfate 5g/L, sodium borohydride 14g/L; Aluminum chloride 30g/L; Citric acid 20g/L; Sulfurous gas 30g/L; Polyoxyethylene glycol 0.03g/L; Gelatin 0.5g/L.
As optimal technical scheme, coating method of the present invention, the thickness of described the first metal plating is 5-15nm, such as being 7nm, 10nm, 14nm etc.
As optimal technical scheme, coating method of the present invention, described the second chemical plating solution contains stannous sulfate 10～25g/L, such as being 12g/L, 14g/L, 16g/L, 19g/L, 23g/L etc.; Thiocarbamide 75～90g/L, such as being 77g/L, 81g/L, 84g/L, 88g/L etc.; Citric acid 5～10g/L, such as being 6g/L, 7.5g/L, 9g/L etc.; Sulfurous gas 30-60g/L, such as being 33g/L, 36g/L, 40g/L, 45g/L, 49g/L, 53g/L, 59g/L etc.; The vitriol oil 10～30mL/L of 98%, such as being 12mL/L, 14mL/L, 16mL/L, 19mL/L, 22mL/L, 26mL/L etc.; Gelatin 2～5g/L, such as being 3g/L, 4.5g/L etc.
Preferably, described the second chemical plating solution contains stannous sulfate 15g/L; Thiocarbamide 80g/L; Citric acid 10g/L; Sulfurous gas 40g/L; 98% vitriol oil 10mL/L; Gelatin 5g/L.
As optimal technical scheme, coating method of the present invention, the bed thickness of described the second electroless plating is 30-100nm, such as being 40nm, 50nm, 65nm, 77nm, 89nm, 95nm etc.
Coating method provided by the invention not only can extend the work-ing life of electroplate liquid, is a kind of plating technic of environment-friendly and green, and when application also can be avoided electric leakage or short circuit.
Embodiment
Below by specific embodiment, technical scheme of the present invention is described in further detail.
Embodiment 1
A coating method for metal plating, comprises the steps:
(1) matrix surface that the first chemical plating solution is sprayed on to precoating plates the first metal plating;
(2) surface washing that applies the first metal layer is clean, then in the second chemical plating solution that contains gentleer reductive agent, carry out second step electroless plating;
Described the first chemical plating solution contains stannous sulfate 5g/L, sodium borohydride 20g/L; Aluminum chloride 20g/L; Citric acid 15g/L; Sulfurous gas 50g/L; Polyoxyethylene glycol 0.05g/L; Gelatin 0.5g/L;
The thickness of described the first metal plating is 5nm;
Described the second chemical plating solution contains stannous sulfate 25g/L; Thiocarbamide 90g/L; Citric acid 5g/L; Sulfurous gas 60g/L; 98% vitriol oil 10mL/L; Gelatin 2g/L;
The thickness of described the second metal plating is 100nm.
Embodiment 2
A coating method for metal plating, comprises the steps:
(1) matrix surface that the first chemical plating solution is sprayed on to precoating plates the first metal plating;
(2) surface washing that applies the first metal layer is clean, then in the second chemical plating solution that contains gentleer reductive agent, carry out second step electroless plating;
Described the first chemical plating solution contains stannous sulfate 10g/L, sodium borohydride 10g/L; Aluminum chloride 40g/L; Citric acid 25g/L; Sulfurous gas 20g/L; Polyoxyethylene glycol 0.01g/L; Gelatin 1.0g/L;
The thickness of described the first metal plating is 15nm;
Described the second chemical plating solution contains stannous sulfate 10g/L; Thiocarbamide 75g/L; Citric acid 10g/L; Sulfurous gas 30g/L; 98% vitriol oil 30mL/L; Gelatin 5g/L;
The thickness of described the second metal plating is 30nm.
Embodiment 3
A coating method for metal plating, comprises the steps:
(1) matrix surface that the first chemical plating solution is sprayed on to precoating plates the first metal plating;
(2) surface washing that applies the first metal layer is clean, then in the second chemical plating solution that contains gentleer reductive agent, carry out second step electroless plating;
Described the first chemical plating solution contains stannous sulfate 7g/L, sodium borohydride 15g/L; Aluminum chloride 30g/L; Citric acid 15～25g/L; Sulfurous gas 40g/L; Polyoxyethylene glycol 0.03g/L; Gelatin 0.7g/L;
The thickness of described the first metal plating is 10nm;
Described the second chemical plating solution contains stannous sulfate 15g/L; Thiocarbamide 80g/L; Citric acid 8g/L; Sulfurous gas 40g/L; 98% vitriol oil 20mL/L; Gelatin 4g/L;
The thickness of described the second metal plating is 60nm.
Applicant's statement, the present invention illustrates detailed process equipment and process flow process of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned detailed process equipment and process flow process, do not mean that the present invention must rely on above-mentioned detailed process equipment and process flow process and could implement.Person of ordinary skill in the field should understand, any improvement in the present invention, to the selection of the interpolation of the equivalence replacement of each raw material of product of the present invention and ancillary component, concrete mode etc., within all dropping on protection scope of the present invention and open scope.
Claims (6)
1. a coating method for metal plating, comprises the steps:
(1) matrix surface that the first chemical plating solution is sprayed on to precoating plates the first metal plating;
(2) surface washing that applies the first metal layer is clean, then in the second chemical plating solution that contains gentleer reductive agent, carry out second step electroless plating;
Described the first chemical plating solution contains stannous sulfate 5～10g/L, sodium borohydride 10～20g/L; Aluminum chloride 20～40g/L; Citric acid 15～25g/L; Sulfurous gas 20-50g/L; Polyoxyethylene glycol 0.01-0.05g/L; Gelatin 0.5～1.0g/L.
2. coating method according to claim 1, is characterized in that, described the first chemical plating solution contains stannous sulfate 5g/L, sodium borohydride 14g/L; Aluminum chloride 30g/L; Citric acid 20g/L; Sulfurous gas 30g/L; Polyoxyethylene glycol 0.03g/L; Gelatin 0.5g/L.
3. coating method according to claim 1 and 2, is characterized in that, the thickness of described the first metal plating is 5-15nm.
4. coating method according to claim 1 and 2, is characterized in that, described the second chemical plating solution contains stannous sulfate 10～25g/L; Thiocarbamide 75～90g/L; Citric acid 5～10g/L; Sulfurous gas 30-60g/L; The vitriol oil 10～30mL/L of 98%; Gelatin 2～5g/L.
5. coating method according to claim 4, is characterized in that, described the second chemical plating solution contains stannous sulfate 15g/L; Thiocarbamide 80g/L; Citric acid 10g/L; Sulfurous gas 40g/L; 98% vitriol oil 10mL/L; Gelatin 5g/L.
6. according to the coating method described in claim 1-5 any one, it is characterized in that, the bed thickness of described the second electroless plating is 30-100nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410473533.1A CN104178755A (en) | 2014-09-16 | 2014-09-16 | Coating method for metal coating |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410473533.1A CN104178755A (en) | 2014-09-16 | 2014-09-16 | Coating method for metal coating |
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| CN104178755A true CN104178755A (en) | 2014-12-03 |
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| CN201410473533.1A Pending CN104178755A (en) | 2014-09-16 | 2014-09-16 | Coating method for metal coating |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105839115A (en) * | 2016-05-30 | 2016-08-10 | 方雪锋 | Coating process for transmission shaft spline shaft |
| CN111663129A (en) * | 2019-03-06 | 2020-09-15 | 唐文海 | Chemical aluminium alloy plating process (aluminium chloride type) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101705482A (en) * | 2009-11-19 | 2010-05-12 | 广州电器科学研究院 | Alkyl sulfonic acid chemical tinning solution and chemical tinning solution based tinning process |
| CN101717929A (en) * | 2009-12-14 | 2010-06-02 | 昆明理工大学 | Semi-bright lead-free chemical tinning liquid and using method thereof |
| CN101760730A (en) * | 2010-02-21 | 2010-06-30 | 太原师范学院 | Low-temperature chemical tinning solution and tinning method |
| CN102994994A (en) * | 2012-10-30 | 2013-03-27 | 南通汇丰电子科技有限公司 | Lead-free electroless tin plating solution |
-
2014
- 2014-09-16 CN CN201410473533.1A patent/CN104178755A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101705482A (en) * | 2009-11-19 | 2010-05-12 | 广州电器科学研究院 | Alkyl sulfonic acid chemical tinning solution and chemical tinning solution based tinning process |
| CN101717929A (en) * | 2009-12-14 | 2010-06-02 | 昆明理工大学 | Semi-bright lead-free chemical tinning liquid and using method thereof |
| CN101760730A (en) * | 2010-02-21 | 2010-06-30 | 太原师范学院 | Low-temperature chemical tinning solution and tinning method |
| CN102994994A (en) * | 2012-10-30 | 2013-03-27 | 南通汇丰电子科技有限公司 | Lead-free electroless tin plating solution |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105839115A (en) * | 2016-05-30 | 2016-08-10 | 方雪锋 | Coating process for transmission shaft spline shaft |
| CN105839115B (en) * | 2016-05-30 | 2018-05-01 | 日照德艺智能仪表有限公司 | A kind of coating processes of splined driveshaft axis |
| CN111663129A (en) * | 2019-03-06 | 2020-09-15 | 唐文海 | Chemical aluminium alloy plating process (aluminium chloride type) |
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Application publication date: 20141203 |
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