JPS5565398A - Surface blackening method of steel plate or steel strip - Google Patents
Surface blackening method of steel plate or steel stripInfo
- Publication number
- JPS5565398A JPS5565398A JP13641978A JP13641978A JPS5565398A JP S5565398 A JPS5565398 A JP S5565398A JP 13641978 A JP13641978 A JP 13641978A JP 13641978 A JP13641978 A JP 13641978A JP S5565398 A JPS5565398 A JP S5565398A
- Authority
- JP
- Japan
- Prior art keywords
- steel plate
- tannin
- polarized
- positive
- voltage
- 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.)
- Pending
Links
Landscapes
- Electrochemical Coating By Surface Reaction (AREA)
Abstract
PURPOSE: To achieve the reduction in annealing time by dipping an ungreased steel plate as one pole into a tannin-contained electrolytic bath and supplying current under the specific conditions thereby forming a black film on the steel plate surfaces.
CONSTITUTION: At the time of subjecting a cold rolled steel plate to continuous annealing treatment, it is dipped with its rolling oil being held unremoved into the aqueous solution containing tannin or tannic acid. Next, if DC voltage and AC voltage are applied simultaneously and in the direction where a positive DC bias is applied to the steel plate, between the steel plate and counter electrode, then the oil contents are removed when the steel plate surfaces are polarized to negative and tannin or tannic acid deposits thereon when they are polarized to positive, whereby the black film of a uniform thickness is formed. Thereby, the thermal efficiency in the next annealing process is enhanced considerably and the annealing time may be reduced.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13641978A JPS5565398A (en) | 1978-11-06 | 1978-11-06 | Surface blackening method of steel plate or steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13641978A JPS5565398A (en) | 1978-11-06 | 1978-11-06 | Surface blackening method of steel plate or steel strip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5565398A true JPS5565398A (en) | 1980-05-16 |
Family
ID=15174708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13641978A Pending JPS5565398A (en) | 1978-11-06 | 1978-11-06 | Surface blackening method of steel plate or steel strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5565398A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110306429A1 (en) * | 2009-02-27 | 2011-12-15 | Nte Corporation | Grease composition, grease-packed bearing, universal joint for propeller shaft, lubricating oil composition, and oil-impregnated sintered bearing |
-
1978
- 1978-11-06 JP JP13641978A patent/JPS5565398A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110306429A1 (en) * | 2009-02-27 | 2011-12-15 | Nte Corporation | Grease composition, grease-packed bearing, universal joint for propeller shaft, lubricating oil composition, and oil-impregnated sintered bearing |
| US8946134B2 (en) * | 2009-02-27 | 2015-02-03 | Ntn Corporation | Grease composition, grease-packed bearing, universal joint for propeller shaft, lubricating oil composition, and oil-impregnated sintered bearing |
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