US1846765A - Protection of metallic films from galvanic reactions on photographic layers or the like being applied to them - Google Patents

Protection of metallic films from galvanic reactions on photographic layers or the like being applied to them Download PDF

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Publication number
US1846765A
US1846765A US474220A US47422030A US1846765A US 1846765 A US1846765 A US 1846765A US 474220 A US474220 A US 474220A US 47422030 A US47422030 A US 47422030A US 1846765 A US1846765 A US 1846765A
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United States
Prior art keywords
protection
metallic films
galvanic
photographic
photographic layers
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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 - Lifetime
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US474220A
Inventor
Semenitz Christian
Loewenthal Siegfried
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REINOLD KUPFER
Original Assignee
REINOLD KUPFER
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Filing date
Publication date
Application filed by REINOLD KUPFER filed Critical REINOLD KUPFER
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Publication of US1846765A publication Critical patent/US1846765A/en
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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
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
    • C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/76—Photosensitive materials characterised by the base or auxiliary layers
    • G03C1/77—Photosensitive materials characterised by the base or auxiliary layers the base being of metal

Definitions

  • the present invention relates to means to prevent or greatly reduce such galvanic action.
  • the salts above referred to, are either more negative or more positive than the carrier metal, the salt and the metal form a galvanic couple with a resultant electro- 'motive force.
  • a step in the fprocess for treating metallic photographic lms in liquid baths .containing solutions of metallic salts comprising passing a Weak direct current through the carrier metal'in such bath in such direction as to buck and nullify the eflect of the galvanic current due to the difference of potential set up between the metallic film and the metal in the salt bath.

Description

Patented Feb. 23, 1932 UNITED STATES PATENT OFFICE CHRISTIAN SEMENITZ AND SIIEGrIERIED- LOEWENTHAL, OF BERLIN, GERMANYQAS- SIGNORS TO REINOLD KU'PFEIR, OF BERLIN, GERMANY PROTECTION OF METALLIC FILMS FROM GALVANIC REACTIONS ON PHOTOGRAPHIC LAYERS OR THE LIKE BEING APPLIED TO THEM No Drawing. Application filed August 9, 1930, Serial No. 474,220, and in Germany May 10, 1929.
lVhen photographic or similar layers are applied to metallic films, for example to thin aluminum foils or films, it is found that when the so-coated films are introduced into photographic baths, that is, the baths for treating the photographic layers, the metal salts dissolved in the bath and depositcd on the layers bring about galvanic reactions between such salts and the carrier metal which leads to the deterioration of the photographic layer and to corrosion of the carrier metal.
Similar deleterious galvanic reaction may take place not only in the photographic bath; but also in applying 0r drying the photographic layer.
The present invention relates to means to prevent or greatly reduce such galvanic action. As the salts, above referred to, are either more negative or more positive than the carrier metal, the salt and the metal form a galvanic couple with a resultant electro- 'motive force. By applying during the rier metal in such bath in such direction as Y to buck and nullify the effect of the galvanic current due to the difference of potential set up between the metallic film and the metal in the salt bath.
2. A step in the fprocess for treating metallic photographic lms in liquid baths .containing solutions of metallic salts, comprising passing a Weak direct current through the carrier metal'in such bath in such direction as to buck and nullify the eflect of the galvanic current due to the difference of potential set up between the metallic film and the metal in the salt bath.
US474220A 1929-05-10 1930-08-09 Protection of metallic films from galvanic reactions on photographic layers or the like being applied to them Expired - Lifetime US1846765A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1846765X 1929-05-10

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US1846765A true US1846765A (en) 1932-02-23

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US474220A Expired - Lifetime US1846765A (en) 1929-05-10 1930-08-09 Protection of metallic films from galvanic reactions on photographic layers or the like being applied to them

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BE (1) BE372390A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3056738A (en) * 1959-02-02 1962-10-02 Harry C Fischer Impressed current cathodic protection system
US3201335A (en) * 1962-02-08 1965-08-17 Shell Oil Co Corrosion protection
US3265601A (en) * 1961-05-26 1966-08-09 Inst Francais Du Petrole Process for protecting metals against corrosion at elevated temperatures

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3056738A (en) * 1959-02-02 1962-10-02 Harry C Fischer Impressed current cathodic protection system
US3265601A (en) * 1961-05-26 1966-08-09 Inst Francais Du Petrole Process for protecting metals against corrosion at elevated temperatures
US3201335A (en) * 1962-02-08 1965-08-17 Shell Oil Co Corrosion protection

Also Published As

Publication number Publication date
BE372390A (en)

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