GB757188A - Improvements relating to the production of a protective coating of aluminium or its alloys on poppet valves - Google Patents
Improvements relating to the production of a protective coating of aluminium or its alloys on poppet valvesInfo
- Publication number
- GB757188A GB757188A GB32549/54A GB3254954A GB757188A GB 757188 A GB757188 A GB 757188A GB 32549/54 A GB32549/54 A GB 32549/54A GB 3254954 A GB3254954 A GB 3254954A GB 757188 A GB757188 A GB 757188A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coating metal
- salt bath
- aluminium
- valve head
- water
- 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
Links
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
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Lift Valve (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
757,188. Tinning; cleaning metal; fluxing. GENERAL MOTORS CORPORATION. Nov. 10, 1954 [Nov. 27, 1953], No. 32549/54. Class 82(2). Poppet valves are provided with an aluminium or aluminium alloy protective coating on the valve head by dipping into the molten coating metal and thereafter removing excess coating metal by a gaseous jet directed against the seating surface. The valve head is first dipped into a salt bath at 1280‹- 1400‹F. of a composition 37-57 KCl; 25-45 NaCl; 8-20 Na 3 AlF 6 ; 0À5-12 AlF 3 , all in parts per centum and then dipped in the coating metal (if aluminium alloy is used. A1 must comprise at least 80 per centum) for 5-10 seconds. A short rinse in the salt bath may follow to remove some of the excess coating metal; the salt bath in this case may float on the coating metal. The part is then gas blasted in the apparatus described below and air-cooled to below 800‹F., then water quenched. If the valve head is very dirty, it may be cleaned by dipping in a molten electrolytic salt bath at 900‹F., washed in water, and then pickled in a mixture of hydrofluoric, sulphuric and nitric acids in water. Alternatively, or in addition, degreasing solvents or grit or sand blasting may be resorted to. Parts not to be coated are treated by a stop-off comprising 20-50 per centum sodium silicate in aqueous solution. The gaseous blast is applied in an apparatus comprising a cylindrical casing 10 having secured therein two cylinders 22, 14 the former being screw-threaded to vary the distance apart of these cylinders, the gap forming an annular nozzle 30. The bottom cylinder 14 is secured to the outer casing 10 and provided with a gas inlet 40. A further gas inlet pipe 48 provides a blast on the end of the head of the valve, which is held in a clamp 54. Compressed air is supplied to the device at 75-110 1bs. sq. in. but other gases could be used.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US757188XA | 1953-11-27 | 1953-11-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB757188A true GB757188A (en) | 1956-09-12 |
Family
ID=22127562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB32549/54A Expired GB757188A (en) | 1953-11-27 | 1954-11-10 | Improvements relating to the production of a protective coating of aluminium or its alloys on poppet valves |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB757188A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1204911B (en) * | 1957-07-30 | 1965-11-11 | Edward Peter Schreyer | Method and device for the production of heat, corrosion and erosion-resistant protective coatings made of aluminum or an aluminum alloy on metallic objects, in particular engine valves, by immersion in a molten metal bath |
| WO2004010067A1 (en) * | 2002-07-23 | 2004-01-29 | Excera Materials Group, Inc. | Removal of adherent molten metal from surfaces |
-
1954
- 1954-11-10 GB GB32549/54A patent/GB757188A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1204911B (en) * | 1957-07-30 | 1965-11-11 | Edward Peter Schreyer | Method and device for the production of heat, corrosion and erosion-resistant protective coatings made of aluminum or an aluminum alloy on metallic objects, in particular engine valves, by immersion in a molten metal bath |
| WO2004010067A1 (en) * | 2002-07-23 | 2004-01-29 | Excera Materials Group, Inc. | Removal of adherent molten metal from surfaces |
| US7045022B2 (en) | 2002-07-23 | 2006-05-16 | Excera Materials Group, Inc. | Removal of adherent molten metal from surfaces |
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