CN111304702A - Process for chrome plating of parts - Google Patents
Process for chrome plating of parts Download PDFInfo
- Publication number
- CN111304702A CN111304702A CN202010317644.9A CN202010317644A CN111304702A CN 111304702 A CN111304702 A CN 111304702A CN 202010317644 A CN202010317644 A CN 202010317644A CN 111304702 A CN111304702 A CN 111304702A
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- Prior art keywords
- water
- plating
- hanger
- chromium
- electroplating solution
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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
- C25D3/04—Electroplating: Baths therefor from solutions of chromium
- C25D3/06—Electroplating: Baths therefor from solutions of chromium from solutions of trivalent chromium
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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
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/10—Electroplating with more than one layer of the same or of different metals
- C25D5/12—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
The invention discloses a part chromium plating process method, which comprises the following steps: the method comprises the following steps: derusting the parts, observing the surface cleanliness of the parts, and taking out the parts when the surfaces are smooth and clean; step two: and clamping the taken-out part by using a clamp, putting the part into water, rotating the part clockwise for two to five minutes when the part is completely immersed in the water, and then rotating the part anticlockwise for two to five minutes to ensure that the part is fully contacted with the water, wherein when the part is hung and cleaned by using the hook, the cleaning of the hook is not ignored. According to the invention, a chromium coating with large internal stress can be obtained by adding a small amount of SeO 42-into the electroplating solution, and the internal stress of the high-stress nickel coating and the internal stress of the chromium coating are superposed to further improve the stress of the coating, so that the problem that the surface stress of the existing chromium plating process is usually insufficient after the chromium plating is carried out on the part, and the part is easily damaged when the chromium plating process is used under the condition of large mechanical stress requirement is solved.
Description
Technical Field
The invention relates to the technical field of part electroplating, in particular to a part chromium plating process method.
Background
Chromium is a slightly bluish silvery white metal, the chromium metal is extremely easy to passivate in the air, a very thin passivating film is formed on the surface, so that the property of noble metal is displayed, the chromium plated layer has very high hardness, the hardness can be changed within a very wide range of 400-1200 HV according to different plating solution components and process conditions, the chromium plated layer has good heat resistance, the gloss and the hardness of the chromium plated layer are not obviously changed when the chromium plated layer is heated below 500 ℃, the chromium plated layer starts to be oxidized and discolored when the temperature is higher than 500 ℃, the hardness of the chromium plated layer starts to be reduced when the temperature is higher than 700 ℃, the friction coefficient of the chromium plated layer is small, particularly the dry friction coefficient is the lowest in all metals, so the chromium plated layer has good wear resistance, the hard chromium plated layer is generally applied to the surface of a product position of a mold, and after the chromium plated treatment, the mold and a workpiece have the advantages.
The existing chromium plating process has insufficient surface stress after the parts are subjected to chromium plating, and the parts are easily damaged when the chromium plating process is used under the condition of high mechanical stress requirement.
Disclosure of Invention
The invention aims to provide a part chromium plating process method, which has the advantage of large chromium plating surface stress and solves the problem that the existing chromium plating process is often insufficient in surface stress after chromium plating is carried out on parts, and the parts are easily damaged when the process is used under the condition of large mechanical stress requirement.
In order to achieve the purpose, the invention provides the following technical scheme: a part chromium plating process method comprises the following steps:
the method comprises the following steps: derusting the parts, observing the surface cleanliness of the parts, and taking out the parts when the surfaces are smooth and clean;
step two: clamping the taken-out part by using a clamp, putting the part into water, rotating the part clockwise for two to five minutes when the part is completely immersed in the water, then rotating the part anticlockwise for two to five minutes to enable the part to be fully contacted with the water, when the part is hung and cleaned by using a hook, not neglecting the cleaning of the hook, when the depth of a cleaning tank is shallow (the depth of the front few grooves of a counter-current cleaning tank is shallower), the upper part of a hanger cannot be soaked below the water surface when the hanger is cleaned, when the hanger is dismounted and dried, the solution on the hanger can pollute a plated part to cause the plating to bloom and generate spots, at the moment, a tap can be used for washing or a water spoon is used for pouring the upper part of the hanger which is not cleaned to avoid the fault, when the part is taken out, the part stays above the cleaning tank for a moment, not neglecting the cleaning of the hook, when the depth of the cleaning tank is shallower (the depth of the front few grooves, when the hanger is cleaned, the upper part of the hanger can not be soaked below the water surface, when the hanger is dismounted and dried, the solution on the hanger can pollute a plating part to cause the plating layer to bloom and generate spots, and at the moment, the upper part of the hanger which is not cleaned can be washed by a tap or poured by a water spoon to avoid the fault;
step three: etching, namely putting the part into a container containing sulfuric acid, immersing the part into the container, removing oxide skin and rusty materials on the surface of the metal part by using the sulfuric acid, taking out the part, and repeating the step two;
step four: preparing electroplating solution, easily placing the prepared electroplating solution on a workbench, and then placing the part in the electroplating solution to immerse the part in the electroplating solution for chromium electroplating;
step five: adding a small amount of SeO 42-into the chromium plating electroplating solution until the plating layer reaches 20-25 μm, reducing the temperature of the electroplating solution, taking out the electroplating solution, standing for a period of time, and repeating the step two;
step six: plating a layer of high stress nickel with the thickness of 0.5-3 mu m on the original chromium plating layer, taking out the high stress nickel, and repeating the step two;
step seven: plating 0.25 μm common decorative chromium on the surface of the high-stress nickel, taking out, and repeating the step two;
step eight: and after the water washing is finished, placing the parts in a drying box, adjusting the temperature of the drying box to 200-250 ℃ for drying treatment, and taking the parts out of the drying box after drying for 3 minutes.
Preferably, the plating solution is prepared by:
the method comprises the following steps: adding two thirds of distilled water into the plating tank;
step two: dissolving needed chromic anhydride in water and adding into a chromium plating tank;
step three: adding the required sulfuric acid, and fully stirring;
step four: adding hydrogen peroxide to generate the required trivalent chromium, and adding water while stirring (1 g of trivalent chromium is generated per 2ml of hydrogen peroxide);
step five: adding HD05-2 additive according to the required dosage, and stirring and adding;
step six: filling distilled water on the required liquid level, and fully stirring;
step seven: heating the electroplating solution to a certain temperature, and carrying out electrolysis treatment for 2 to 10 hours.
Preferably, the rust removing treatment adopts high-pressure water jet injection treatment, and the method comprises the following specific steps:
the method comprises the following steps: clamping and fixing the part by a clamp, and then placing the part on a workbench of a high-pressure jet flow derusting machine;
step two: starting a high-pressure jet flow deruster, and spraying high pressure moving at high speed to the surface of a part to generate strong impact and friction with rust on the surface of the part;
step three: and when the rust on the surface of the part is gradually washed until the surface of the part is completely smooth, closing the high-pressure jet flow rust remover and taking out the part.
Preferably, the standing time is 5 to 10 minutes.
Preferably, the initial temperature of the plating solution is 66 ℃ to 74 ℃, and the temperature of the plating solution after being reduced is 52 ℃ to 58 ℃.
Preferably, the anode current density of the plating solution is: 30A/dm 2.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, a chromium coating with large internal stress can be obtained by adding a small amount of SeO 42-into the electroplating solution, and the internal stress of the high-stress nickel coating and the internal stress of the chromium coating are superposed to further improve the stress of the coating, so that the problem that the surface stress of the existing chromium plating process is usually insufficient after the chromium plating is carried out on the part, and the part is easily damaged when the chromium plating process is used under the condition of large mechanical stress requirement is solved.
Detailed Description
In order to make the objects, contents, and advantages of the present invention clearer, embodiments of the present invention are described in further detail:
a part chromium plating process method comprises the following steps:
the method comprises the following steps: the method comprises the following steps of (1) carrying out rust removal treatment on parts, (wherein the rust removal treatment adopts high-pressure water jet treatment, and the method comprises the following specific steps:
the method comprises the following steps: clamping and fixing the part by a clamp, and then placing the part on a workbench of a high-pressure jet flow derusting machine;
step two: starting a high-pressure jet flow deruster, and spraying high pressure moving at high speed to the surface of a part to generate strong impact and friction with rust on the surface of the part;
step three: when the rust on the surface of the part is gradually washed until the surface of the part is completely smooth, closing the high-pressure jet flow rust remover and taking out the part);
observing the surface cleanliness of the part, and taking out the part when the surface is smooth and clean;
step two: clamping the taken-out part by using a clamp, putting the part into water, rotating the part clockwise for two to five minutes when the part is completely immersed in the water, then rotating the part anticlockwise for two to five minutes to enable the part to be fully contacted with the water, when the part is hung and cleaned by using a hook, not neglecting the cleaning of the hook, when the depth of a cleaning tank is shallow (the depth of the front few grooves of a counter-current cleaning tank is shallower), the upper part of a hanger cannot be soaked below the water surface when the hanger is cleaned, when the hanger is dismounted and dried, the solution on the hanger can pollute a plated part to cause the plating to bloom and generate spots, at the moment, a tap can be used for washing or a water spoon is used for pouring the upper part of the hanger which is not cleaned to avoid the fault, when the part is taken out, the part stays above the cleaning tank for a moment, not neglecting the cleaning of the hook, when the depth of the cleaning tank is shallower (the depth of the front few grooves, when the hanger is cleaned, the upper part of the hanger can not be soaked below the water surface, when the hanger is dismounted and dried, the solution on the hanger can pollute a plating part to cause the plating layer to bloom and generate spots, and at the moment, the upper part of the hanger which is not cleaned can be washed by a tap or poured by a water spoon to avoid the fault;
step three: etching, namely putting the part into a container containing sulfuric acid, immersing the part into the container, removing oxide skin and rusty materials on the surface of the metal part by using the sulfuric acid, taking out the part, and repeating the step two;
step four: preparing an electroplating solution, wherein the anode current density of the electroplating solution is as follows: 30A/dm2, (the plating solution preparation steps are:
the method comprises the following steps: adding two thirds of distilled water into the plating tank;
step two: dissolving needed chromic anhydride in water and adding into a chromium plating tank;
step three: adding the required sulfuric acid, and fully stirring;
step four: adding hydrogen peroxide to generate the required trivalent chromium, and adding water while stirring (1 g of trivalent chromium is generated per 2ml of hydrogen peroxide);
step five: adding HD05-2 additive according to the required dosage, and stirring and adding;
step six: filling distilled water on the required liquid level, and fully stirring;
step seven: heating the electroplating solution to a certain temperature, and carrying out electrolysis treatment for 2 to 10 hours);
placing the prepared electroplating solution on a workbench, and then placing the part in the electroplating solution to immerse the part in the electroplating solution for chromium electroplating;
step five: adding a small amount of SeO 42-into the chromium plating electroplating solution until the plating layer reaches 20-25 μm, reducing the temperature of the electroplating solution, taking out the electroplating solution and standing for a period of time, wherein the standing time is 5-10 minutes, and repeating the step II;
step six: plating a layer of high stress nickel with the thickness of 0.5-3 mu m on the original chromium plating layer, taking out the high stress nickel, and repeating the step two;
step seven: plating 0.25 μm common decorative chromium on the surface of the high-stress nickel, taking out, and repeating the step two;
step eight: and after the water washing is finished, placing the parts in a drying box, adjusting the temperature of the drying box to 200-250 ℃ for drying treatment, and taking the parts out of the drying box after drying for 3 minutes.
The first embodiment is as follows: a part chromium plating process method comprises the following steps:
the method comprises the following steps: the method comprises the following steps of (1) carrying out rust removal treatment on parts, (wherein the rust removal treatment adopts high-pressure water jet treatment, and the method comprises the following specific steps:
the method comprises the following steps: clamping and fixing the part by a clamp, and then placing the part on a workbench of a high-pressure jet flow derusting machine;
step two: starting a high-pressure jet flow deruster, and spraying high pressure moving at high speed to the surface of a part to generate strong impact and friction with rust on the surface of the part;
step three: when the rust on the surface of the part is gradually washed until the surface of the part is completely smooth, closing the high-pressure jet flow rust remover and taking out the part);
observing the surface cleanliness of the part, and taking out the part when the surface is smooth and clean;
step two: clamping the taken-out part by using a clamp, putting the part into water, rotating the part clockwise for two to five minutes when the part is completely immersed in the water, then rotating the part anticlockwise for two to five minutes to enable the part to be fully contacted with the water, when the part is hung and cleaned by using a hook, not neglecting the cleaning of the hook, when the depth of a cleaning tank is shallow (the depth of the front few grooves of a counter-current cleaning tank is shallower), the upper part of a hanger cannot be soaked below the water surface when the hanger is cleaned, when the hanger is dismounted and dried, the solution on the hanger can pollute a plated part to cause the plating to bloom and generate spots, at the moment, a tap can be used for washing or a water spoon is used for pouring the upper part of the hanger which is not cleaned to avoid the fault, when the part is taken out, the part stays above the cleaning tank for a moment, not neglecting the cleaning of the hook, when the depth of the cleaning tank is shallower (the depth of the front few grooves, when the hanger is cleaned, the upper part of the hanger cannot be soaked below the water surface, when the hanger is detached and dried, the solution on the hanger can pollute a plated part to cause the plating layer to bloom and generate spots, at the moment, the upper part of the hanger which is not cleaned can be washed by a tap or poured by a water spoon to avoid the fault, and before cleaning, the cleaning water cannot contain excessive calcium and magnesium ions, otherwise, the hanger is easy to generate precipitation after being brought into the plating solution; the plating solution can not contain excessive calcium and magnesium ions, otherwise, the plating solution is easy to generate precipitation; the plating solution can not contain excessive calcium and magnesium ions, otherwise, the plating solution is easy to generate precipitation;
step three: etching, namely putting the part into a container containing sulfuric acid, immersing the part into the container, removing oxide skin and rusty materials on the surface of the metal part by using the sulfuric acid, taking out the part, and repeating the step two;
step four: preparing electroplating solution, easily placing the prepared electroplating solution on a workbench, and then placing the part in the electroplating solution to immerse the part in the electroplating solution for chromium electroplating;
step five: adding a small amount of SeO 42-into the chromium plating electroplating solution until the plating layer reaches 20-25 μm, reducing the temperature of the electroplating solution, taking out the electroplating solution and standing for a period of time, wherein the standing time is 5-10 minutes, and repeating the step II;
step six: plating a layer of high stress nickel with the thickness of 0.5-3 mu m on the original chromium plating layer, taking out the high stress nickel, and repeating the step two;
step seven: plating 0.25 μm common decorative chromium on the surface of the high-stress nickel, taking out, and repeating the step two;
step eight: and after the water washing is finished, placing the parts in a drying box, adjusting the temperature of the drying box to 200-250 ℃ for drying treatment, and taking the parts out of the drying box after drying for 3 minutes.
In summary, the following steps: the part chromium plating process method solves the problems that the surface stress of the existing chromium plating process is usually insufficient after chromium plating is carried out on the part, and the part is easily damaged when the chromium plating process is used under the condition of high mechanical stress requirement.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A part chromium plating process method is characterized in that: the method comprises the following steps:
the method comprises the following steps: derusting the parts, observing the surface cleanliness of the parts, and taking out the parts when the surfaces are smooth and clean;
step two: clamping the taken-out part by using a clamp, putting the part into water, rotating the part clockwise for two to five minutes when the part is completely immersed in the water, then rotating the part anticlockwise for two to five minutes to enable the part to be fully contacted with the water, when the part is hung and cleaned by using a hook, not neglecting the cleaning of the hook, when the depth of a cleaning tank is shallow (the depth of the front few grooves of a counter-current cleaning tank is shallower), the upper part of a hanger cannot be soaked below the water surface when the hanger is cleaned, when the hanger is dismounted and dried, the solution on the hanger can pollute a plated part to cause the plating to bloom and generate spots, at the moment, a tap can be used for washing or a water spoon is used for pouring the upper part of the hanger which is not cleaned to avoid the fault, when the part is taken out, the part stays above the cleaning tank for a moment, not neglecting the cleaning of the hook, when the depth of the cleaning tank is shallower (the depth of the front few grooves, when the hanger is cleaned, the upper part of the hanger can not be soaked below the water surface, when the hanger is dismounted and dried, the solution on the hanger can pollute a plating part to cause the plating layer to bloom and generate spots, and at the moment, the upper part of the hanger which is not cleaned can be washed by a tap or poured by a water spoon to avoid the fault;
step three: etching, namely putting the part into a container containing sulfuric acid, immersing the part into the container, removing oxide skin and rusty materials on the surface of the metal part by using the sulfuric acid, taking out the part, and repeating the step two;
step four: preparing electroplating solution, easily placing the prepared electroplating solution on a workbench, and then placing the part in the electroplating solution to immerse the part in the electroplating solution for chromium electroplating;
step five: adding a small amount of SeO 42-into the chromium plating electroplating solution until the plating layer reaches 20-25 μm, reducing the temperature of the electroplating solution, taking out the electroplating solution, standing for a period of time, and repeating the step two;
step six: plating a layer of high stress nickel with the thickness of 0.5-3 mu m on the original chromium plating layer, taking out the high stress nickel, and repeating the step two;
step seven: plating 0.25 μm common decorative chromium on the surface of the high-stress nickel, taking out, and repeating the step two;
step eight: and after the water washing is finished, placing the parts in a drying box, adjusting the temperature of the drying box to 200-250 ℃ for drying treatment, and taking the parts out of the drying box after drying for 3 minutes.
2. The process for chrome plating of parts according to claim 1, characterized in that: the preparation steps of the electroplating solution are as follows:
the method comprises the following steps: adding two thirds of distilled water into the plating tank;
step two: dissolving needed chromic anhydride in water and adding into a chromium plating tank;
step three: adding the required sulfuric acid, and fully stirring;
step four: adding hydrogen peroxide to generate the required trivalent chromium, and adding water while stirring (1 g of trivalent chromium is generated per 2ml of hydrogen peroxide);
step five: adding HD05-2 additive according to the required dosage, and stirring and adding;
step six: filling distilled water on the required liquid level, and fully stirring;
step seven: heating the electroplating solution to a certain temperature, and carrying out electrolysis treatment for 2 to 10 hours.
3. The process for chrome plating of parts according to claim 1, characterized in that: the rust removing treatment adopts high-pressure water jet injection treatment, and the method comprises the following specific steps:
the method comprises the following steps: clamping and fixing the part by a clamp, and then placing the part on a workbench of a high-pressure jet flow derusting machine;
step two: starting a high-pressure jet flow deruster, and spraying high pressure moving at high speed to the surface of a part to generate strong impact and friction with rust on the surface of the part;
step three: and when the rust on the surface of the part is gradually washed until the surface of the part is completely smooth, closing the high-pressure jet flow rust remover and taking out the part.
4. The process for chrome plating of parts according to claim 1, characterized in that: the standing time is 5 to 10 minutes.
5. The process for chrome plating of parts according to claim 1, characterized in that: the initial temperature of the electroplating solution is 66-74 ℃, and the temperature of the electroplating solution after being reduced is 52-58 ℃.
6. The process for chrome plating of parts according to claim 1, characterized in that: the anode current density of the electroplating solution is as follows: 30A/dm 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010317644.9A CN111304702A (en) | 2020-04-21 | 2020-04-21 | Process for chrome plating of parts |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010317644.9A CN111304702A (en) | 2020-04-21 | 2020-04-21 | Process for chrome plating of parts |
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| CN111304702A true CN111304702A (en) | 2020-06-19 |
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| CN202010317644.9A Pending CN111304702A (en) | 2020-04-21 | 2020-04-21 | Process for chrome plating of parts |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4473448A (en) * | 1981-02-09 | 1984-09-25 | W. Canning Materials Limited | Electrodeposition of chromium |
| US4477315A (en) * | 1980-11-10 | 1984-10-16 | Omi International Corporation | Trivalent chromium electrolyte and process employing reducing agents |
| CN87100409A (en) * | 1987-01-26 | 1988-08-10 | 北京市理化分析测试中心 | A kind of low cost, little contaminated, high performance, micro-cracked chrome plating process |
| CN1038676A (en) * | 1988-06-21 | 1990-01-10 | M&T化学品公司 | The electroplate liquid of the bright smooth functional chromium of high-level efficiency deposition |
| CN103046085A (en) * | 2012-12-27 | 2013-04-17 | 南通市申海工业技术科技有限公司 | Chromium plating process of nuclear generator unit members |
-
2020
- 2020-04-21 CN CN202010317644.9A patent/CN111304702A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4477315A (en) * | 1980-11-10 | 1984-10-16 | Omi International Corporation | Trivalent chromium electrolyte and process employing reducing agents |
| US4473448A (en) * | 1981-02-09 | 1984-09-25 | W. Canning Materials Limited | Electrodeposition of chromium |
| CN87100409A (en) * | 1987-01-26 | 1988-08-10 | 北京市理化分析测试中心 | A kind of low cost, little contaminated, high performance, micro-cracked chrome plating process |
| CN1038676A (en) * | 1988-06-21 | 1990-01-10 | M&T化学品公司 | The electroplate liquid of the bright smooth functional chromium of high-level efficiency deposition |
| CN103046085A (en) * | 2012-12-27 | 2013-04-17 | 南通市申海工业技术科技有限公司 | Chromium plating process of nuclear generator unit members |
Non-Patent Citations (2)
| Title |
|---|
| 王翠平 主编: "《电镀工艺实用技术教程》", 31 August 2007, 国防工业出版社 * |
| 胡明辉 编著: "《电镀企业现场管理与技术》", 30 September 2012, 国防工业出版社 * |
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Application publication date: 20200619 |
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