US2971898A - Electroplating ferrous-base molded bodies - Google Patents
Electroplating ferrous-base molded bodies Download PDFInfo
- Publication number
- US2971898A US2971898A US741720A US74172058A US2971898A US 2971898 A US2971898 A US 2971898A US 741720 A US741720 A US 741720A US 74172058 A US74172058 A US 74172058A US 2971898 A US2971898 A US 2971898A
- Authority
- US
- United States
- Prior art keywords
- bodies
- electroplating
- oxide layer
- ferrous
- molded bodies
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000009713 electroplating Methods 0.000 title claims description 8
- 238000000576 coating method Methods 0.000 claims description 11
- 238000004663 powder metallurgy Methods 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 3
- 238000011282 treatment Methods 0.000 claims description 3
- 238000000151 deposition Methods 0.000 claims description 2
- 238000004326 stimulated echo acquisition mode for imaging Methods 0.000 claims 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 27
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- 229910052759 nickel Inorganic materials 0.000 description 14
- 238000005260 corrosion Methods 0.000 description 9
- 230000007797 corrosion Effects 0.000 description 9
- 229910052742 iron Inorganic materials 0.000 description 7
- 239000011148 porous material Substances 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 239000002659 electrodeposit Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000002815 nickel Chemical class 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
Classifications
-
- 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
- C25D5/36—Pretreatment of metallic surfaces to be electroplated of iron or steel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
Definitions
- the object of the invention is an iron containing body manufactured by powder metallurgy, which is electroplated in accordance with galvanic action and under the electroplated coating corrosion does not occur.
- a further object of the invention is a process for electroplating iron containing bodies manufactured by powder metallurgy.
- Iron containing molded bodies manufactured by powder metallurgy having a pore content more than can be treated according to the invention and firmly adhering electrolytically deposited metal layer can be obtained.
- the process according to the invention can be used with particular advantage on iron containing bodies, manufactured by powder metallurgy, the porosity of which exceeds and can range up to 30%.
- the blue oxide layer processed on the surface of these bodies closes the surface pores sufiiciently, so that under the electrolytically deposited metal layer corrosion does not occur.
- Example 1 Gears, produced by powder metallurgy from iron powder containing 7% Cu and 0.2% C in a manner known in the art, are treated with superheated steam at a temperature ranging between 550 and 600 degrees centigrade for 20 minutes. A blue oxide layer is formed in the course of this treatment. After cooling, these gears are nickel plated in a galvanic bath, accordingto known practice, for 50 minutes, whereby a nickel coating of 8-1011. is obtained. These nickel electroplated gears are polished with cloth buffs known in the art. This nickel layer can be coated if desired by electrolytically deposited chromium.
- Example 2 Gears are manufactured from iron powder containing 30% Cu and Fe, they are coated with a blue oxide layer and electroplated with nickel according to Example 1.
- the nickel layer adheres in both cases firmly and the corrosion caused by the galvanic bath under the nickel layer cannot be stated.
- the porosity of a nickel coating on such a blue oxide layer is less than that of a nickel coating produced in the usual manner on an electrodeposited copper layer.
- Example 3 Molded bodies were produced from iron powder according to the so-called Hametag process with an additive of 1% graphite and 2% copper powder in the usual way known in the art.
- the porosity of these bodies amounts to about 30%.
- These bodies are treated for .6 hour with superheated steam at a temperature between 550 and 600 degrees centigrade. Owing to the high porosity, not all the pores .are closed by the blue oxide layer so that some of the galvanic bath penetrates into the pores. But the quantity of this penetrated liquid is so small that the corrosion can practically be neglected.
- a process for electroplating ferrous-base molded bodies having a porosity ranging between 10 and 30% manufactured by powder metallurgy comprising first providing the bodies with a blue oxide layer by treatment with superheated steam, and, after cooling, electrolytically depositing a metal coating on the blue oxide layer.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating Methods And Accessories (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Description
United States Patent ELECTROPLATING FERROUS-BASE MOLDED BODIES Plma Szky, Izidor Nemnyi, and Terezia Eiilliis, Budapest, Hungary, assiguors to Altalanos Gptervezti Iroda, Budapest, Hungary No Drawing. Filed June 13, 1958, Ser. No. 741,720
Claims priority, application Hungary July 12, 1957 2 Claims. (Cl. 204-43) The object of the invention is an iron containing body manufactured by powder metallurgy, which is electroplated in accordance with galvanic action and under the electroplated coating corrosion does not occur. A further object of the invention is a process for electroplating iron containing bodies manufactured by powder metallurgy.
It is often desirable to electroplate molded bodies which were manufactured by powder metallurgy, especially with nickel or nickel and chromium. These bodies having a porous structure the galvanic bath used for the electroplating penetrates into them causing corrosion under the coating which might lead to the disintegration of the bodies. This phenomenon prevents the direct electroplating of such porous bodies.
It has been found that the corrosion mentioned above can be eliminated on these iron containing bodies manufactured by powder metallurgy and a firmly adhering electrodeposit can be achieved if it is applied on a body, the surface of which is provided with a blue oxide layer produced by superheated steam.
It is known in the art to produce a blue oxide layer on the surface of powder metallurgical bodies in order to reduce their porosity, to increase their resistance to corrosion and their hardness. Such blue oxide coatings are produced with superheated steam at a temperature ranging e.g. from 550 to 600 degrees centigrade and gives a certain protection against corrosion. Such bodies were not electroplated because it was not to be believed that the electrodeposit would firmly adhere to such an oxide layer. In the course of our experiments it was found that this blue oxide layer adheres not only to a great extent to the iron containing bodies manufactured by powder metallurgy, but also that a firmly adhering electrodeposit, for instance copper, nickel or chromium, can be produced on it. So for instance a nickel coating adheres so firmly to the blue oxide layer that the intermediate copper layer generally used hithereto is unnecessary, a fact which is surprising.
Iron containing molded bodies manufactured by powder metallurgy, having a pore content more than can be treated according to the invention and firmly adhering electrolytically deposited metal layer can be obtained. The process according to the invention can be used with particular advantage on iron containing bodies, manufactured by powder metallurgy, the porosity of which exceeds and can range up to 30%. The blue oxide layer processed on the surface of these bodies closes the surface pores sufiiciently, so that under the electrolytically deposited metal layer corrosion does not occur.
Example 1 Gears, produced by powder metallurgy from iron powder containing 7% Cu and 0.2% C in a manner known in the art, are treated with superheated steam at a temperature ranging between 550 and 600 degrees centigrade for 20 minutes. A blue oxide layer is formed in the course of this treatment. After cooling, these gears are nickel plated in a galvanic bath, accordingto known practice, for 50 minutes, whereby a nickel coating of 8-1011. is obtained. These nickel electroplated gears are polished with cloth buffs known in the art. This nickel layer can be coated if desired by electrolytically deposited chromium.
Example 2 Gears are manufactured from iron powder containing 30% Cu and Fe, they are coated with a blue oxide layer and electroplated with nickel according to Example 1.
The nickel layer adheres in both cases firmly and the corrosion caused by the galvanic bath under the nickel layer cannot be stated.
The porosity of a nickel coating on such a blue oxide layer is less than that of a nickel coating produced in the usual manner on an electrodeposited copper layer.
Example 3 Molded bodies were produced from iron powder according to the so-called Hametag process with an additive of 1% graphite and 2% copper powder in the usual way known in the art. The porosity of these bodies amounts to about 30%. These bodies are treated for .6 hour with superheated steam at a temperature between 550 and 600 degrees centigrade. Owing to the high porosity, not all the pores .are closed by the blue oxide layer so that some of the galvanic bath penetrates into the pores. But the quantity of this penetrated liquid is so small that the corrosion can practically be neglected. Should the porosity of the molded body produced by powder metallurgy not exceed 20% of the pores on the surface are sufficiently closed by the blue oxide layer applied so that electrolyte does not penetrate into the pores in the course of electroplating and so no corrosion can be traced under the electrolytically deposited layer.
What we claim is:
l. A process for electroplating ferrous-base molded bodies having a porosity ranging between 10 and 30% manufactured by powder metallurgy, comprising first providing the bodies with a blue oxide layer by treatment with superheated steam, and, after cooling, electrolytically depositing a metal coating on the blue oxide layer.
2. A process according to claim 1, in which the metal coating is a nickel coating.
References Cited in the file of this patent UNITED STATES PATENTS 2,528,717 H Batcheller Nov. 7, 1950
Claims (1)
1. A PROCESS FOR ELECTROPLATING FERROUS-BASE MOLDED BODIES HAVING A POROSITY RANGING BETWEEN 10 AND 30% MANUFACTURED BY POWDER METALLURGY, COMPRISING FIRST PROVIDING THE BODIES WITH A BLUE OXIDE LAYER BY TREATMENT WITH SUPERHEATED STEAM, AND, AFTER COOLING, ELECTROLYTICALLY DEPOSITING A METAL COATING ON THE BLUE OXIDE LAYER.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| HU852016X | 1957-07-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2971898A true US2971898A (en) | 1961-02-14 |
Family
ID=10980643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US741720A Expired - Lifetime US2971898A (en) | 1957-07-12 | 1958-06-13 | Electroplating ferrous-base molded bodies |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2971898A (en) |
| DE (1) | DE1060215B (en) |
| FR (1) | FR1208581A (en) |
| GB (1) | GB852016A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111074310A (en) * | 2019-12-25 | 2020-04-28 | 深圳市富优驰科技有限公司 | Process for improving wear resistance and corrosion resistance of iron-based powder metallurgy part |
| CN113802161A (en) * | 2021-07-19 | 2021-12-17 | 辉门环新（安庆）粉末冶金有限公司 | Copper plating process for powder metallurgy material |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104328463A (en) * | 2014-10-23 | 2015-02-04 | 苏州莱特复合材料有限公司 | Chromium-plating method for iron-based powder metallurgical material |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2528717A (en) * | 1944-10-11 | 1950-11-07 | Batcheller Clements | Method of electroplating stainless steels and irons |
-
1957
- 1957-11-26 DE DEA28395A patent/DE1060215B/en active Pending
-
1958
- 1958-06-13 US US741720A patent/US2971898A/en not_active Expired - Lifetime
- 1958-06-20 GB GB19858/58A patent/GB852016A/en not_active Expired
- 1958-07-10 FR FR1208581D patent/FR1208581A/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2528717A (en) * | 1944-10-11 | 1950-11-07 | Batcheller Clements | Method of electroplating stainless steels and irons |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111074310A (en) * | 2019-12-25 | 2020-04-28 | 深圳市富优驰科技有限公司 | Process for improving wear resistance and corrosion resistance of iron-based powder metallurgy part |
| CN111074310B (en) * | 2019-12-25 | 2022-05-03 | 东莞华晶粉末冶金有限公司 | Process for improving wear resistance and corrosion resistance of iron-based powder metallurgy part |
| CN113802161A (en) * | 2021-07-19 | 2021-12-17 | 辉门环新（安庆）粉末冶金有限公司 | Copper plating process for powder metallurgy material |
| CN113802161B (en) * | 2021-07-19 | 2022-09-27 | 辉门环新（安庆）粉末冶金有限公司 | Copper plating process for powder metallurgy material |
Also Published As
| Publication number | Publication date |
|---|---|
| FR1208581A (en) | 1960-02-24 |
| GB852016A (en) | 1960-10-19 |
| DE1060215B (en) | 1959-06-25 |
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