US3129111A - Process for tin coating copper plated magnesium - Google Patents
Process for tin coating copper plated magnesium Download PDFInfo
- Publication number
- US3129111A US3129111A US192293A US19229362A US3129111A US 3129111 A US3129111 A US 3129111A US 192293 A US192293 A US 192293A US 19229362 A US19229362 A US 19229362A US 3129111 A US3129111 A US 3129111A
- Authority
- US
- United States
- Prior art keywords
- article
- coating
- copper plated
- magnesium
- coating solution
- 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
- 239000011248 coating agent Substances 0.000 title claims description 24
- 238000000576 coating method Methods 0.000 title claims description 24
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims description 16
- 229910052749 magnesium Inorganic materials 0.000 title claims description 14
- 239000011777 magnesium Substances 0.000 title claims description 14
- 238000000034 method Methods 0.000 title claims description 12
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 title description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title description 7
- 229910052802 copper Inorganic materials 0.000 title description 7
- 239000010949 copper Substances 0.000 title description 7
- 230000004907 flux Effects 0.000 claims description 7
- 239000011253 protective coating Substances 0.000 claims description 5
- 238000007598 dipping method Methods 0.000 claims description 4
- 229910000679 solder Inorganic materials 0.000 claims description 4
- 230000001680 brushing effect Effects 0.000 claims description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- LQBJWKCYZGMFEV-UHFFFAOYSA-N lead tin Chemical compound [Sn].[Pb] LQBJWKCYZGMFEV-UHFFFAOYSA-N 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 2
- 239000004264 Petrolatum Substances 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 229940066842 petrolatum Drugs 0.000 description 1
- 235000019271 petrolatum Nutrition 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
Classifications
-
- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/08—Tin or alloys based thereon
Definitions
- This invention relates to a process for dip-coating previously copper plated metallic articles such as articles made of magnesium.
- Magnesium which is one of the more chemically active metals, is widely used on air borne equipment and for other uses where its relatively lightweight and favorable Weight-strength ratio make it a desirable material. It has always been a problem to provide articles and components made of magnesium with a suitable protective coating which would protect the magnesium from a corrosive atmosphere; and in many other applications to protect the article from salt spray conditions found around salt water bodies.
- magnesium parts which have been coated by the process to be described below have superior corrosion resistance to like magnesium parts coated by previously known methods.
- the primary object of the present invention is to provide a superior corrosion resistant protective coating for articles made of magnesium.
- Another object of the present invention is to provide a simple plating process which eliminates some of the ex pensive equipment required for previous plating processes.
- the process of applying the protective coating requires a clipping vat in which a mixture of 90% tin and 10% of 5050 solder (50% tin and 50% lead) is put into solution and maintained at a temperature of 475 F. Such a solution may also be made of 95% tin and lead.
- the process comprises the following steps:
- the previously copper plated magnesium article is covered or wiped with a paste flux such as Nokorode soldering paste comprising: mineral grease (petrolatum), wax, and resin 72 to 80%, zinc chloride 20 to 25%, and ammonium chloride 3%.
- a paste flux such as Nokorode soldering paste comprising: mineral grease (petrolatum), wax, and resin 72 to 80%, zinc chloride 20 to 25%, and ammonium chloride 3%.
- step 1 The article is then removed from the coating solution and its surface brushed with a brush saturated with the same flu); used in step 1 above.
- the molten solution on the hot surface acts much like a paint being applied with a brush and covers all pores and small pits on the surface of the article. Steps 2 and 3 may be repeated if necessary until the entire surface of the article shows a satisfactory coating.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating With Molten Metal (AREA)
Description
United States Patent Ofitice 3,129,111 Patented Apr. 14, 1964 3,129,111 PROCESS FOR TIN COATING QOPPER PLATED MAGNESIUM Werner F. E. Learning, Wilton, (301211., assignor to the United States of America as represented by the Secretary of the Air Force No Drawing. Filed May 3, 1962, Ser. No. 192,293 2 Claims. (Ill. 1117-51) This invention relates to a process for dip-coating previously copper plated metallic articles such as articles made of magnesium.
Magnesium, which is one of the more chemically active metals, is widely used on air borne equipment and for other uses where its relatively lightweight and favorable Weight-strength ratio make it a desirable material. It has always been a problem to provide articles and components made of magnesium with a suitable protective coating which would protect the magnesium from a corrosive atmosphere; and in many other applications to protect the article from salt spray conditions found around salt water bodies.
Experience and controlled test results have shown that magnesium parts which have been coated by the process to be described below have superior corrosion resistance to like magnesium parts coated by previously known methods.
The primary object of the present invention is to provide a superior corrosion resistant protective coating for articles made of magnesium.
Another object of the present invention is to provide a simple plating process which eliminates some of the ex pensive equipment required for previous plating processes.
The process of applying the protective coating requires a clipping vat in which a mixture of 90% tin and 10% of 5050 solder (50% tin and 50% lead) is put into solution and maintained at a temperature of 475 F. Such a solution may also be made of 95% tin and lead.
The process comprises the following steps:
(1) The previously copper plated magnesium article is covered or wiped with a paste flux such as Nokorode soldering paste comprising: mineral grease (petrolatum), wax, and resin 72 to 80%, zinc chloride 20 to 25%, and ammonium chloride 3%.
(2) The article is then immersed or dipped in the dipping vat containing the tin-lead solution to stabilize its temperature with that of the coating solution.
(3) The article is then removed from the coating solution and its surface brushed with a brush saturated with the same flu); used in step 1 above. The molten solution on the hot surface acts much like a paint being applied with a brush and covers all pores and small pits on the surface of the article. Steps 2 and 3 may be repeated if necessary until the entire surface of the article shows a satisfactory coating.
(4) The article is given a final dip in the molten solution to fuse and smooth the coating on the article.
(5) The article is removed from the molten solution and allowed to cool.
Having set forth my invention, I claim:
1. The process of applying a protective coating over a copper plated magnesium article in which the copper plated magnesium article is surface covered with paste flux, then immersing said article for a sufiicient length of time to bring the article to substantially the solution temperature in a coating solution at 475 F. and comprising 90% tin and 10% of 50 solder, then removing said article from the coating solution and brushing the surface of said article with a brush containing said flux, then final dipping said article into said coating solution to produce a smooth coating on the article and then removing said article from said coating solution for cooling.
2. The process of applying a protective tin-lead coating on the surface of a copper plated magnesium article in which the copper plated magnesium article is wiped with a paste flux, then immersing said article in a coating solution of tin and 10% of 50-50 solder at 475 F. for a sufficient length of time to stabilize the temperature of the article with the temperature of the coating solution, then removing said article from the coating solution and brushing the surface of said article with a brush containing said flux until all pores and pits are covered with the solution, then final dipping said article into the coating solution to produce a smooth coating on the article, and then removing said article from said coating solution for cooling.
References fitted in the file of this patent UNITED STATES PATENTS 213,015 Wahl et a1 Mar. 4, 1879 2,872,346 Miller Feb. 3, 1959 FOREIGN PATENTS 3,060 Great Britain of 1866 OTHER REFERENCES Lewis: Notes on Soldering, published by Tin Research Institute, Fraser Road, Greenford, Middlesex, England, revised edition October 1959, reprinted January 1961, pp. 18, 46 and 47. (Copy in Group 160, Coating.)
Claims (1)
1. THE PROCESS OF APPLYING A PROTECTIVE COATING OVER A COPPER PLATED MAGNESIUM ARTICLE IN WHICH THE COPPER PLATED MAGNESIUM ARTICLE IS SURFACE COVERED WITH PASTE FLUX, THEN IMMERSING SAID ARTICLE FOR A SUFFICIENT LENGTH OF TIME TO BRING THE ARTICLE TO SUBSTANTIALLY THE SOLUTION TEMPERATURE IN A COATING SOLUTION AT 475*F. AND COMPRISING 90% TIN AND 10% OF 50-50 SOLDER, THEN REMOVING SAID ARTICLE FROM THE COATING SOLUTION AND BRUSHING THE SURFACE OF SAID ARTICLE WITH A BRUSH CONTAINING SAID FLUX, THEN FINAL DIPPING SAID ARTICLE INTO SAID COATING SOLUTION TO PRODUCE A SMOOTH COATING ON THE ARTICLE AND THEN REMOVING SAID ARTICLE FROM SAID COATING SOLUTION FOR COOLING.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US192293A US3129111A (en) | 1962-05-03 | 1962-05-03 | Process for tin coating copper plated magnesium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US192293A US3129111A (en) | 1962-05-03 | 1962-05-03 | Process for tin coating copper plated magnesium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3129111A true US3129111A (en) | 1964-04-14 |
Family
ID=22709078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US192293A Expired - Lifetime US3129111A (en) | 1962-05-03 | 1962-05-03 | Process for tin coating copper plated magnesium |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US3129111A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US213015A (en) * | 1879-03-04 | Improvement in processes for galvanizing and tinning iron | ||
| US2872346A (en) * | 1956-05-21 | 1959-02-03 | Miller Adolph | Metal plating bath |
-
1962
- 1962-05-03 US US192293A patent/US3129111A/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US213015A (en) * | 1879-03-04 | Improvement in processes for galvanizing and tinning iron | ||
| US2872346A (en) * | 1956-05-21 | 1959-02-03 | Miller Adolph | Metal plating bath |
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