CA2155566A1 - Two-step electrochemical process for coating magnesium - Google Patents
Two-step electrochemical process for coating magnesiumInfo
- Publication number
- CA2155566A1 CA2155566A1 CA002155566A CA2155566A CA2155566A1 CA 2155566 A1 CA2155566 A1 CA 2155566A1 CA 002155566 A CA002155566 A CA 002155566A CA 2155566 A CA2155566 A CA 2155566A CA 2155566 A1 CA2155566 A1 CA 2155566A1
- Authority
- CA
- Canada
- Prior art keywords
- solution
- per liter
- fluoride
- article
- magnesium
- 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.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/30—Anodisation of magnesium or alloys based thereon
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
A two-step process for the coating of magnesium and its alloys is disclosed.
The first step comprises immersing the magnesium workpiece in a first electrochemical solution comprising about 3 to 10 wt-% of a hydroxide and about 5 to 30 wt-% of a fluoride having a pH of at least about 12. By controlling a current density to about 10 to 200 mA/cm2, an increasing voltage differential is established between an anode comprising the pretreated article and a cathode also in contact with the electrolytic solution. Next, the article is immersed in an aqueous electrolytic solution having a pH of at least about 11 and which solution is prepared from components comprising a water soluble hydroxyde, a fluoride source and a water soluble silicate in amounts to result in an addition of about 2 to 15 g of a hydroxide per liter of solution, about 2 to 14 g of a fluoride per liter of solution and about S to 40 g of a silicate per liter of solution. Again, by controlling the current density to about 5 to 100 mA/cm2, an increasing voltage differential of at least about 150 volts is established between an anode comprising the pretreated article and a cathode also in contact with the electrolytic solution. This process results in a superior coating which has increased abrasion and corrosion resistance.
The first step comprises immersing the magnesium workpiece in a first electrochemical solution comprising about 3 to 10 wt-% of a hydroxide and about 5 to 30 wt-% of a fluoride having a pH of at least about 12. By controlling a current density to about 10 to 200 mA/cm2, an increasing voltage differential is established between an anode comprising the pretreated article and a cathode also in contact with the electrolytic solution. Next, the article is immersed in an aqueous electrolytic solution having a pH of at least about 11 and which solution is prepared from components comprising a water soluble hydroxyde, a fluoride source and a water soluble silicate in amounts to result in an addition of about 2 to 15 g of a hydroxide per liter of solution, about 2 to 14 g of a fluoride per liter of solution and about S to 40 g of a silicate per liter of solution. Again, by controlling the current density to about 5 to 100 mA/cm2, an increasing voltage differential of at least about 150 volts is established between an anode comprising the pretreated article and a cathode also in contact with the electrolytic solution. This process results in a superior coating which has increased abrasion and corrosion resistance.
Priority Applications (10)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/729,612 US5264113A (en) | 1991-07-15 | 1991-07-15 | Two-step electrochemical process for coating magnesium alloys |
| CN92105181A CN1039139C (en) | 1991-07-15 | 1992-06-26 | Two Step electrochemical magne-sium coating process |
| US07/943,325 US5266412A (en) | 1991-07-15 | 1992-09-10 | Coated magnesium alloys |
| DE69311376T DE69311376T2 (en) | 1991-07-15 | 1993-02-09 | TWO-STAGE ELECTROCHEMICAL METHOD FOR COATING MAGNESIUM |
| CA002155566A CA2155566C (en) | 1991-07-15 | 1993-02-09 | Two-step electrochemical process for coating magnesium |
| EP93905839A EP0688370B1 (en) | 1991-07-15 | 1993-02-09 | Two-step electrochemical process for coating magnesium |
| JP51797294A JP3178608B2 (en) | 1991-07-15 | 1993-02-09 | Two-step electrochemical method for magnesium coating |
| PCT/US1993/001165 WO1994018362A1 (en) | 1991-07-15 | 1993-02-09 | Two-step electrochemical process for coating magnesium |
| AU36607/93A AU3660793A (en) | 1991-07-15 | 1993-02-09 | Two-step electrochemical process for coating magnesium |
| NO953131A NO309660B1 (en) | 1991-07-15 | 1995-08-09 | Process for forming an improved corrosion-resistant coating on a magnesium-containing article |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/729,612 US5264113A (en) | 1991-07-15 | 1991-07-15 | Two-step electrochemical process for coating magnesium alloys |
| US07/943,325 US5266412A (en) | 1991-07-15 | 1992-09-10 | Coated magnesium alloys |
| CA002155566A CA2155566C (en) | 1991-07-15 | 1993-02-09 | Two-step electrochemical process for coating magnesium |
| PCT/US1993/001165 WO1994018362A1 (en) | 1991-07-15 | 1993-02-09 | Two-step electrochemical process for coating magnesium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2155566A1 true CA2155566A1 (en) | 1994-08-18 |
| CA2155566C CA2155566C (en) | 2004-07-20 |
Family
ID=27170060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002155566A Expired - Lifetime CA2155566C (en) | 1991-07-15 | 1993-02-09 | Two-step electrochemical process for coating magnesium |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU3660793A (en) |
| CA (1) | CA2155566C (en) |
-
1993
- 1993-02-09 CA CA002155566A patent/CA2155566C/en not_active Expired - Lifetime
- 1993-02-09 AU AU36607/93A patent/AU3660793A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| AU3660793A (en) | 1994-08-29 |
| CA2155566C (en) | 2004-07-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLC | Lapsed (correction) | ||
| MKEX | Expiry |
Effective date: 20130211 |