FR2081148A1 - Matt chromium plating - for offset printing plates of enhanced hydrophilic character - Google Patents
Matt chromium plating - for offset printing plates of enhanced hydrophilic characterInfo
- Publication number
- FR2081148A1 FR2081148A1 FR7008497A FR7008497A FR2081148A1 FR 2081148 A1 FR2081148 A1 FR 2081148A1 FR 7008497 A FR7008497 A FR 7008497A FR 7008497 A FR7008497 A FR 7008497A FR 2081148 A1 FR2081148 A1 FR 2081148A1
- Authority
- FR
- France
- Prior art keywords
- offset printing
- printing plates
- secs
- periods
- cathodic
- 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
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/18—Electroplating using modulated, pulsed or reversing current
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/627—Electroplating characterised by the visual appearance of the layers, e.g. colour, brightness or mat appearance
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
Matt chrome plate, grey to black in colour, is formed on supports of Zn, Al, Cu, brass, steel by an electroplating process in which the polarity is periodically reversed, the cathodic period exceeding the anodic. Specif. the plating bath contains 250 g/l chromic acid, 2.5 g/l H2SO4, is used at 10-60 (35-45) degrees C, 10-50 (20-30) A/dm for cathodic periods of 10-100 (40-80) secs. and anodic periods 1-8 (1-4) secs. The last period is cathodic and is of longer duration than the other periods. Total plating time is 250-1000 (316-367) secs. The final surface has improved hydrophilic props. and adherence of the photosensitive layer when used as offset printing plates.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7008497A FR2081148A1 (en) | 1970-03-10 | 1970-03-10 | Matt chromium plating - for offset printing plates of enhanced hydrophilic character |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7008497A FR2081148A1 (en) | 1970-03-10 | 1970-03-10 | Matt chromium plating - for offset printing plates of enhanced hydrophilic character |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2081148A1 true FR2081148A1 (en) | 1971-12-03 |
FR2081148B1 FR2081148B1 (en) | 1973-10-19 |
Family
ID=9052009
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7008497A Granted FR2081148A1 (en) | 1970-03-10 | 1970-03-10 | Matt chromium plating - for offset printing plates of enhanced hydrophilic character |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2081148A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4619742A (en) * | 1984-07-04 | 1986-10-28 | Hoechst Aktiengesellschaft | Process for the simultaneous graining and chromium-plating of steel plates as supports for lithographic applications |
FR2586711A1 (en) * | 1985-09-03 | 1987-03-06 | Centre Techn Ind Mecanique | Process and plant for electrolytic chromium plating |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE475331A (en) * |
-
1970
- 1970-03-10 FR FR7008497A patent/FR2081148A1/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE475331A (en) * |
Non-Patent Citations (1)
Title |
---|
Article de PAMFILOV LOPUSHANS- KAYA et GRU publié dans Ukrain.Khim.Zhur.26 (1960) 31-5 et résumé dans Chemical Abstracts, 1960, page 16221 b * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4619742A (en) * | 1984-07-04 | 1986-10-28 | Hoechst Aktiengesellschaft | Process for the simultaneous graining and chromium-plating of steel plates as supports for lithographic applications |
FR2586711A1 (en) * | 1985-09-03 | 1987-03-06 | Centre Techn Ind Mecanique | Process and plant for electrolytic chromium plating |
Also Published As
Publication number | Publication date |
---|---|
FR2081148B1 (en) | 1973-10-19 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
TP | Transmission of property | ||
ST | Notification of lapse |