US2297241A - Plating of aluminum - Google Patents
Plating of aluminum Download PDFInfo
- Publication number
- US2297241A US2297241A US252503A US25250339A US2297241A US 2297241 A US2297241 A US 2297241A US 252503 A US252503 A US 252503A US 25250339 A US25250339 A US 25250339A US 2297241 A US2297241 A US 2297241A
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- US
- United States
- Prior art keywords
- fluoride
- aluminum
- boron
- solution
- objects
- 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
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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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/31—Coating with metals
Definitions
- the present invention relates to a process for mined the nature of my said-invention and in the production of firmly adherent metal coatings on objects of aluminum or aluminum alloys, in
- metal-salt solutions which the coatings are obtained solely by dipping the objects in suitable metal-salt solutions.
- an aqueous solution of metal-fluoride compounds and in particular an aqueous solution of metal-silicon-fiuoride or metal-boron-fluoride is proposed for this purp se.
- the saidsalts of metals which are nobler than aluminum are suitable.
- Example 2 An almost saturated solution; of zinc-boron- 1 fiuoride is diluted with iour to five volumes of water. Additions of a heavy metal'fiuoride say oi the metal nickel, iron, copper or tin in the pr0- portion of about two, per thousand and of a colloid in the proportion of about five per thousand of the total liquid, follow. The solution is used at about 30 f0 40 C.
- said solution containing a colloid selected from the group consisting of gelatin, gelatoses, albumoses, dextrine and sulphite-lye, the immersion being continued until a pure metallic coating of a thickness of the order of about 0.1 mm. has been produced.
- concentration of the aqueous solution is that corresponding to a saturated solution of the heavy metal silicon-fluoride or boron-fluoride which has been diluted with about 4-5 volumes of water.
- concentration of the aqueous solution is that corresponding to a saturated solution of the heavy metal silicon-fluoride or boron-fluoride which has been diluted with about 4-5 volumes of water.
- concentration 01 the aqueous solution is that corresponding to a saturated solution of the heavy metal silicon-fluoride or boron-fluoride which has been diluted with about 4-5 volumes of water.
- concentration otthe aqueous solution is that corresponding to a saturated solution of the heavy metal silicon-fluorid or boron-fluoride which has been diluted with about 4-5 volumes of water.
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- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Silicon Compounds (AREA)
- Chemically Coating (AREA)
Description
Patented 2 9,
* UNITED ,S'lATES aPA'lEN-T OFFICE,
. shame or summon Leonhard Pernen-Be'rlin, vested in tlie Alien Property No Drawing. Application was 2:, 1m, 's erial No. 252,503. In Germany August 2. 1931 Y Claims. 01. 117-130) The present invention relates to a process for mined the nature of my said-invention and in the production of firmly adherent metal coatings on objects of aluminum or aluminum alloys, in
which the coatings are obtained solely by dipping the objects in suitable metal-salt solutions. According to the invention an aqueous solution of metal-fluoride compounds and in particular an aqueous solution of metal-silicon-fiuoride or metal-boron-fluoride is proposed for this purp se. The saidsalts of metals which are nobler than aluminum are suitable.
In order on one hand to hinder the hydrolysis of the dissolved salts and on the-other to improve the deposition of the metal in question on to the objects, it is insome circumstances of advantage to add fluorides oi the alkali, light or heavy metals, in particular the fluor-silicates or fluorborates, to the solution. To improve the metal coating still further and in particular to obtain a fine-crystalline structure of the layer, it has been found advantageous to add to the bath organic wh'atmanner thesameis'tobe clare that what I claim is:
1. A non-electrolytic process for the produc-" tion ora firmly adherent coating of a pure heavy metal, which is nobler than aluminum and which forms a water-soluble silicon-fluoride andlor boron-fluoride, on objects of aluminum oraluminum alloys, in which the objects are merely immersed in an aqueous solution of a member ,0!
performed 1' dethe group consisting of the'silicon-fiuoride's and boron-fluorides of said heavy metal until a coating of the latter is termed, the immersion being continued until a pure metallic coating of a thickness or the order of about 0.1 him. has been produced. r 2. A non-electrolytic process for the production of a firmly adherent of a pure heavy metal, whichis nobler than aluminum'and which orms a water-soluble silicon-fluoride and/or ron-fiuoride, on objects or aluminum or aluminum alloys, in which the objects are merely immersed in an aqueous. solution of a silicon-fluorrelatively thick coatings can be obtained by the process, the coatings-are well adapted for polish- Ezanpl 1 An almost saturated cadmium-silicon fiuoride solution is diluted with four to five volumes of ide oi the said heavy metal until a coating of the latter is formed, the immersion being continued until a pure metallic coating .oi a thickness oi the order of about 0.1 mm has been produced.
3. A non-electrolytic process for the production of a firmly adherent coating of a pure heavy metal, which is nobler-than aluminumand which forms a water-soluble silicon-fluoride and/or boron-fluoride, on objects oi aluminum or aluminum alloys; in which the objects are merel immersed in an aqueous solution or a boron-fluoride oi the said heavy metal until a coating of the I Y latter is formed, the immersion'beingcontinu'ed until a puremetallic coating of .a thickness of water, One or two or the abovementioned colloids are added tov the solution in the proportion of. two to five parts per "thousand of the total solution. The work pieces to be treated are dipped in this solution for five to ten minutes at room temperature.
Example 2 An almost saturated solution; of zinc-boron- 1 fiuoride is diluted with iour to five volumes of water. Additions of a heavy metal'fiuoride say oi the metal nickel, iron, copper or tin in the pr0- portion of about two, per thousand and of a colloid in the proportion of about five per thousand of the total liquid, follow. The solution is used at about 30 f0 40 C.
' Having now Particularly. described a ascerthe order or about 0.1 mnnhas been produced.
.4. A non-electrolytic process for the produc-- tion of a firmly adherent coating of a -eheavy metal. which is nobler than aluminum and which forms a water-soluble silicon-fluoride and/or boron-fluoride. on objects of aluminum or aluminumnlloys, in which the objects are merely immersed in an aqueous solution oi a silicon-fluoride of the said heavymetal until a coating'oi the latter is formed, said solution containing a colloid selected from the sl'omzo oi' gelatin,
selatoses, albumoses, dextrlneand sulphite-lye,"
the immersion being continued until a pure metallic coating of a thickness or the order oi about 0.1 mm'. hasbeen'produced.
5. A non-electrolytic process for the produc .tionoiafirmlyadherentcoatingoiapureheavy metal, which is nobler and which forms a water-soluble silicon-fluoride and/or boron-fluoride, on objects of aluminum or aluminum alloys, in which the objects are merely im-V mersed in an aqueous solution of a boron-fluoride of the said heavy metal until a coating of the latter is formed. said solution containing a colloid selected from the group consisting of gelatin, gelatoses, albumoses, dextrine and sulphite-lye, the immersion being continued until a pure metallic coating of a thickness of the order of about 0.1 mm. has been produced.
6. A process according to claim 1, wherein the concentration of the aqueous solution is that corresponding to a saturated solution of the heavy metal silicon-fluoride or boron-fluoride which has been diluted with about 4-5 volumes of water.
7. A process according to claim 2, wherein the concentration of the aqueous solution is that corresponding to a saturated solution of the heavy. 20
has been diluted with about 4-5 volumes of water.
8. A process according to claim 3, wherein the concentration of the aqueous solution is that corresponding to a saturated solution of the heavy metal silicon-fluoride or boron-fluoride which has been diluted with about 4-5 volumes of water.
9. A process according to claim 4, wherein the concentration 01 the aqueous solution is that corresponding to a saturated solution of the heavy metal silicon-fluoride or boron-fluoride which has been diluted with about 4-5 volumes of water. I
10. A process according to claim 5, wherein the concentration otthe aqueous solution is that corresponding to a saturated solution of the heavy metal silicon-fluorid or boron-fluoride which has been diluted with about 4-5 volumes of water.
LEONHARD PERNER.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2297241X | 1937-08-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2297241A true US2297241A (en) | 1942-09-29 |
Family
ID=7993958
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US252503A Expired - Lifetime US2297241A (en) | 1937-08-02 | 1939-01-23 | Plating of aluminum |
Country Status (1)
Country | Link |
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US (1) | US2297241A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2526544A (en) * | 1947-10-06 | 1950-10-17 | Dow Chemical Co | Method of producing a metallic coating on magnesium and its alloys |
US2580773A (en) * | 1948-07-31 | 1952-01-01 | Philadelphia Rust Proof Co | Method and composition for coating aluminum with zinc |
US2680711A (en) * | 1950-03-10 | 1954-06-08 | Norwitz George | Deposition of copper by immersion |
US3050410A (en) * | 1960-09-15 | 1962-08-21 | Gen Motors Corp | Method of coating aluminum with lead |
US3193474A (en) * | 1959-07-13 | 1965-07-06 | M & T Chemicals Inc | Plating on aluminum |
US3284324A (en) * | 1962-12-28 | 1966-11-08 | Ibm | Substrate preparation method |
US4888218A (en) * | 1983-05-09 | 1989-12-19 | Alcan International Limited | Process for applying a zinc coating to an aluminum article |
US5466360A (en) * | 1994-10-13 | 1995-11-14 | Robert Z. Reath | Method for preparing aluminum for subsequent electroplating |
-
1939
- 1939-01-23 US US252503A patent/US2297241A/en not_active Expired - Lifetime
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2526544A (en) * | 1947-10-06 | 1950-10-17 | Dow Chemical Co | Method of producing a metallic coating on magnesium and its alloys |
US2580773A (en) * | 1948-07-31 | 1952-01-01 | Philadelphia Rust Proof Co | Method and composition for coating aluminum with zinc |
US2680711A (en) * | 1950-03-10 | 1954-06-08 | Norwitz George | Deposition of copper by immersion |
US3193474A (en) * | 1959-07-13 | 1965-07-06 | M & T Chemicals Inc | Plating on aluminum |
US3050410A (en) * | 1960-09-15 | 1962-08-21 | Gen Motors Corp | Method of coating aluminum with lead |
US3284324A (en) * | 1962-12-28 | 1966-11-08 | Ibm | Substrate preparation method |
US4888218A (en) * | 1983-05-09 | 1989-12-19 | Alcan International Limited | Process for applying a zinc coating to an aluminum article |
US5466360A (en) * | 1994-10-13 | 1995-11-14 | Robert Z. Reath | Method for preparing aluminum for subsequent electroplating |
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