GB1044962A - Producing a protective coating on metal by cathodic coating - Google Patents
Producing a protective coating on metal by cathodic coatingInfo
- Publication number
- GB1044962A GB1044962A GB23025/63A GB2302563A GB1044962A GB 1044962 A GB1044962 A GB 1044962A GB 23025/63 A GB23025/63 A GB 23025/63A GB 2302563 A GB2302563 A GB 2302563A GB 1044962 A GB1044962 A GB 1044962A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coating
- metal
- salt
- typically
- sufficient
- 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
- 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
- C25D11/38—Chromatising
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)
- Coating With Molten Metal (AREA)
Abstract
A tough protective coating is cathodically deposited on a metal base, e.g. of steel, zinc-electroplated steel, or aluminium sheet, from an aqueous solution of pH<1.5 containing a hexavalent chromium compound and a halogen oxyacid or a salt thereof. The halogen oxyacid or salt which may be present in an amount of 1 to 200 g/l is typically perchloric acid, sodium perchlorate, potassium chlorate, or sodium or potassium bromate, while the hexavalent chromium compound which may be in a concentration of 10 to 300 g/l is typically chromic acid but may be a soluble chromate or dichromate together with sufficient perchloric or nitric acid to obtain the necessary pH. Bath temperatures may be from 10 to 90 DEG C with cathode current densities up to 20 A/sq.dm. and treatment times of not more than 1 second. The colour of the coating varies with its thickness, endures working without peeling and accepts paint, for which purpose a coating thickness corresponding to 2 to 3 mg/sq.dm. is sufficient. Before coating the metal is degreased and if rust is present it is pickled, and after coating it is subjected to an alkali dip in dilute sodium hydroxide or ammonia solution.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2391062 | 1962-06-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1044962A true GB1044962A (en) | 1966-10-05 |
Family
ID=12123617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB23025/63A Expired GB1044962A (en) | 1962-06-13 | 1963-06-10 | Producing a protective coating on metal by cathodic coating |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US3288691A (en) |
| DE (1) | DE1521098B2 (en) |
| GB (1) | GB1044962A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1106292A (en) * | 1963-12-04 | 1968-03-13 | Ass Chem Co | Improvements in or relating to the treatment of metals |
| US3535213A (en) * | 1967-12-20 | 1970-10-20 | Yawata Seitetsu Kk | Method of surface-treating metals |
| JPS62107096A (en) * | 1985-11-01 | 1987-05-18 | Nippon Parkerizing Co Ltd | Surface treatment of galvanized steel sheet |
| JPH03223472A (en) * | 1990-01-25 | 1991-10-02 | Nippon Parkerizing Co Ltd | Surface treating liquid and surface treatment for galvanized steel sheet |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2780592A (en) * | 1951-08-22 | 1957-02-05 | Bethlehem Steel Corp | Electrolytic treatment of metal surfaces |
| US2769774A (en) * | 1952-08-05 | 1956-11-06 | Republic Steel Corp | Electrodeposition method |
| FR1080914A (en) * | 1953-06-16 | 1954-12-14 | United States Steel Corp | Electrochemical process for coating steel surfaces, products intended for its implementation and resulting products |
| GB915426A (en) * | 1958-05-30 | 1963-01-09 | Yawata Iron & Steel Co | Electrolytic treatment of metal surfaces |
| US3032487A (en) * | 1958-05-30 | 1962-05-01 | Yawata Iron & Steel Co | Electrolytic treatment of ferrous metal surfaces |
| US2998361A (en) * | 1958-06-11 | 1961-08-29 | Toyo Kohan Co Ltd | Electrochemical treatment of metal surfaces and the products thereof |
| US3081238A (en) * | 1958-09-03 | 1963-03-12 | Quaker Chem Corp | Electrolytic treatment of metal surfaces |
| US3138548A (en) * | 1961-04-11 | 1964-06-23 | Inland Steel Co | Tin plate treatment |
-
1963
- 1963-06-10 GB GB23025/63A patent/GB1044962A/en not_active Expired
- 1963-06-11 US US286918A patent/US3288691A/en not_active Expired - Lifetime
- 1963-06-12 DE DE19631521098 patent/DE1521098B2/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US3288691A (en) | 1966-11-29 |
| DE1521098A1 (en) | 1970-08-20 |
| DE1521098B2 (en) | 1971-05-06 |
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