DE2646590A1 - Chromic acid bath regenerated by electrochemical oxidn. - and used for roughening plastics, esp. printed circuit boards - Google Patents
Chromic acid bath regenerated by electrochemical oxidn. - and used for roughening plastics, esp. printed circuit boardsInfo
- Publication number
- DE2646590A1 DE2646590A1 DE19762646590 DE2646590A DE2646590A1 DE 2646590 A1 DE2646590 A1 DE 2646590A1 DE 19762646590 DE19762646590 DE 19762646590 DE 2646590 A DE2646590 A DE 2646590A DE 2646590 A1 DE2646590 A1 DE 2646590A1
- Authority
- DE
- Germany
- Prior art keywords
- roughening
- bath
- plastics
- esp
- chromic acid
- 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
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/18—Pretreatment of the material to be coated
- C23C18/20—Pretreatment of the material to be coated of organic surfaces, e.g. resins
- C23C18/22—Roughening, e.g. by etching
- C23C18/24—Roughening, e.g. by etching using acid aqueous solutions
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/38—Improvement of the adhesion between the insulating substrate and the metal
- H05K3/381—Improvement of the adhesion between the insulating substrate and the metal by special treatment of the substrate
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating And Plating Baths Therefor (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
Description
Verfahren zur Repenerierung von chromsaurehaltigenr chemischenProcess for the regeneration of chemicals containing chromic acid
Aufrauhbädern für Kunststoffe Zusammenfassung Es wird ein Verfahren vorgeschlagen zur Regenerierung von chromsäurehältigen, chemischen Aufrauhbädern für Kunststoffe. Die Regenerierung erfolgt durch Oxidation auf elektrochemischem Wege, indem in das Aufrauhbad zwei unlösliche Elektroden getaucht werden und mittels dieser Elektroden ein Gleichstrom durch das Bad hindurchgeleitet wird.Plastics Roughening Baths Summary There will be a process suggested for the regeneration of chemical roughening baths containing chromic acid for plastics. The regeneration takes place by oxidation on electrochemical Ways in which two insoluble electrodes are immersed in the roughening bath and by means of A direct current is passed through the bath through these electrodes.
Stand der Technik Chromsäurehaltige Aufrauhbäder für Kunststoffe sind seit langem bekannt und haben sich in der Praxis sehr gut bewährt. In diesen Aufrauhbädern wird durch Chromsäure oxidierbarer Kunststoff gelöst, wobei das sechswertige Chrom zu dreiwertigem Chrom reduziert wird. Das sechswertige Chrom wird also verbrsucht, der Verbrauch wird laufend analytisch ermittelt und ersetzt. In den Bädern reichert sich so dreiwertiges Chrom sowie gelöster Kunststoff als Ballaststoff an. Die Dichte der Bäder steigt, die Viskosität erhöht sich und die Farbe geht von ursprünglich braunrot in schwarz über. Mit dem Ansteigen dieser Ballaststoffe geht, trotz genügendem ChromrVI-Gehalt, die Oxidierbarkeit der Kunststoffe zurück. Wenn dieser Zustand erreicht ist, werden die Bäder bisher, nach entsprechender Vorschrift für die Entgiftung, verworfen.State of the art Chromic acid-containing roughening baths for plastics are known for a long time and have proven themselves very well in practice. In these roughening baths is dissolved by chromic acid oxidizable plastic, the hexavalent chromium is reduced to trivalent chromium. The hexavalent chromium is used up, the consumption is continuously determined analytically and replaced. Enriches in the bathrooms trivalent chromium and dissolved plastic are used as dietary fiber. The concentration the baths increases, the viscosity increases and the color goes from originally brown-red to black over. With the increase in this fiber The oxidisability of the plastics decreases despite sufficient Chromium VI content. When this state is reached, the baths are up to now, according to the appropriate regulations for detox, discarded.
Vorteile der Erfindung Das erfindungsgemäße Verfahren mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß die gelösten Kunststoffe aus dem Aufrauhbad entfernt und gleichzeitig das dreiwertige Chrom wieder zu sechswertigem Chrom oxidiert wird. Ein solches Bad hat praktisch eine unbegrenzte Lebensdauer, es brauchen lediglich die Verschleppungsverluste ersetzt zu werden, ein Verwerfen mit den Folgekosten für Entgiftung, Ausfällung und Sondermülldeponie entfallen.Advantages of the invention The method according to the invention with the characterizing Features of the main claim has the advantage that the dissolved plastics removed from the roughening bath and at the same time the trivalent chrome back to hexavalent Chromium is oxidized. Such a bath has a practically unlimited lifespan, only the carry-over losses need to be replaced, discarding with the follow-up costs for detoxification, precipitation and landfill for hazardous waste are eliminated.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen des im Hauptanspruch angegebenen Verfahrens möglich. Besonders vorteilhaft ist es, wenn man zur Regenerierung des Bades 100 bis 200 Ampèrestunden pro Liter Bad durchsetzt. Die an die Elektroden angelegte Gleichspannung liegt zwischen 0,1 und 20 Volt bei einer Stromdichte von 0>1 bis 50 A/dm2.The measures listed in the subclaims are advantageous Further developments of the method specified in the main claim are possible. Particularly beneficial it is when you use 100 to 200 ampere hours per liter to regenerate the bath Bathroom interspersed. The DC voltage applied to the electrodes is between 0.1 and 20 volts at a current density of 0> 1 to 50 A / dm2.
Die elektrochemische Oxidation von dreiwertigem Chrom zu sechswertigem Chrom ist an sich bekannt. Überraschend ist jedoch, daß gleichzeitig mit dieser Oxidation auch die in dem Bad gelösten oder suspendierten Kunststoffreste oxidativ an der Anode in den gasförmigen Zustand über führt und so aus dem Bad entfernt werden. An der Kathode bildet sich Wasserstoff. Ein nach dem erfindungsgemäßen Verfahren behandeltes Aufrauhbad verliert seine schwarze Farbe und bekommt wieder die brawi-rote Farbe des Neuansatzes. Auch die Viskosität entspricht wieder derjenigen eines Neuansatzes entsprechender Konzentration. Die sich an der Anode in Bezug auf die Entfernung der Kunststoffreste sich ab spielenden elektrochemischen Reaktionen, die zu der vollständigen Regenerierung der Aufrauhbäder führen, sind noch nicht geklärt.The electrochemical oxidation of trivalent chromium to hexavalent Chromium is known per se. What is surprising, however, is that at the same time as this Oxidation also oxidative the plastic residues dissolved or suspended in the bath leads to the gaseous state at the anode and thus removed from the bath. Hydrogen forms at the cathode. One according to the method according to the invention treated roughening bath loses its black color and gets the brawi red again Color of the new approach. The viscosity again corresponds to that of a new batch appropriate concentration. Located on the anode in terms of distance the plastic residues from playing electrochemical reactions that lead to the complete regeneration of the roughening baths have not yet been clarified.
Beschreibung der Erfindung Das folgende Beispiel soll die Erfindung näher erläutern. Ein Aufrauhbad, das seit längerer Zeit im Einsatz ist, schwarz aussieht und schon ziemlich dickflüssig ist, zeigte einen Chrom-VI-Gehalt von 806 g/l, berechnet als CrO3 und einen Chrom-III-Gehalt von 48 g/l, berechnet als Cr203 . In dieses Bad wurden zwei stabföririge, in dem Bad unlösliche Elektroden aus mit Platindraht kontaktiertem Titan eingetaucht und an diese Elektroden eine Spannung von 4 Volt angelegt, wobei sich eine Stromstärke von 10 Ampere ergab. Nach einem Durchsatz von 140 Ah pro Liter war die Lösung wieder klar, die Farbe hatte sich nach braunrot geändert und die Viskosität entsprach der eines Neuansatzes. Der Chrom-III-Cehalt war auf Null zurückgegangen, während der Chrom-VI-Gehalt auf 869 gll angestiegen war. Anode und Kathode zeigten keinerlei Veränderungen. Während die Kunststoffe, z.B. eine Basisplatte für .gedruckte Schaltungen aus Epoxidharz, in dem Aufrauhbad vor der Regenerierung keine ausreichende Aufrauhung mehr ergab, was sich in einer nicht ausreichenden Haftfestigkeit von später aufgebrachten Metallschichten zeigt, entsprach die Aufrauhung der Kunststoffe in dem regenerierten Bad derjenigen eines neuangesetzten Aufrauhbades. Description of the Invention The following example is intended to illustrate the invention explain in more detail. A roughening bath that has been in use for a long time, black looks and is already quite thick, showed a chromium VI content of 806 g / l, calculated as CrO3 and a chromium III content of 48 g / l, calculated as Cr203 . Two rod-shaped electrodes insoluble in the bath were placed in this bath Platinum wire contacted titanium immersed and applied a voltage to these electrodes of 4 volts, resulting in a current of 10 amps. After a Throughput of 140 Ah per liter, the solution was clear again, the color had turned changed to brownish red and the viscosity corresponded to that of a new batch. The chromium III content had decreased to zero, while the chromium VI content increased to 869 gll was. The anode and cathode showed no changes. While the plastics, e.g. a base plate for printed circuits made of epoxy resin in the roughening bath Before the regeneration, there was no longer sufficient roughening, which resulted in a shows insufficient adhesive strength of later applied metal layers, the roughening of the plastics in the regenerated bath corresponded to that of one newly set roughening bath.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19762646590 DE2646590C3 (en) | 1976-10-15 | 1976-10-15 | Process for the regeneration of chromic acid-containing chemical roughening baths for plastics |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19762646590 DE2646590C3 (en) | 1976-10-15 | 1976-10-15 | Process for the regeneration of chromic acid-containing chemical roughening baths for plastics |
Publications (3)
Publication Number | Publication Date |
---|---|
DE2646590A1 true DE2646590A1 (en) | 1978-04-20 |
DE2646590B2 DE2646590B2 (en) | 1981-05-14 |
DE2646590C3 DE2646590C3 (en) | 1982-03-25 |
Family
ID=5990542
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19762646590 Expired DE2646590C3 (en) | 1976-10-15 | 1976-10-15 | Process for the regeneration of chromic acid-containing chemical roughening baths for plastics |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2646590C3 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3450623A (en) * | 1965-10-08 | 1969-06-17 | Great Lakes Carbon Corp | Electrolytic apparatus for the regeneration of chromium salt solutions |
CH510128A (en) * | 1966-01-26 | 1971-07-15 | M & T Chemicals Inc | Method and electrolysis device for treating a bath containing trivalent chromium |
DE2619426A1 (en) * | 1976-04-20 | 1977-11-10 | Dart Ind Inc | PROCESS FOR THE REMOVAL OF ORGANIC AND THREE-VALUE CHROME PRODUCTS FROM CHROME-SULFUR ACID SOLUTIONS FROM THE PLASTIC FACILITY PROCESS |
-
1976
- 1976-10-15 DE DE19762646590 patent/DE2646590C3/en not_active Expired
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3450623A (en) * | 1965-10-08 | 1969-06-17 | Great Lakes Carbon Corp | Electrolytic apparatus for the regeneration of chromium salt solutions |
CH510128A (en) * | 1966-01-26 | 1971-07-15 | M & T Chemicals Inc | Method and electrolysis device for treating a bath containing trivalent chromium |
DE2619426A1 (en) * | 1976-04-20 | 1977-11-10 | Dart Ind Inc | PROCESS FOR THE REMOVAL OF ORGANIC AND THREE-VALUE CHROME PRODUCTS FROM CHROME-SULFUR ACID SOLUTIONS FROM THE PLASTIC FACILITY PROCESS |
Also Published As
Publication number | Publication date |
---|---|
DE2646590B2 (en) | 1981-05-14 |
DE2646590C3 (en) | 1982-03-25 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE19834353C2 (en) | Alkaline zinc-nickel bath | |
DE606850C (en) | Process for generating firmly adhering galvanic deposits on aluminum and its alloys | |
DE2537757C3 (en) | Method of reusing an etching solution | |
DE1621115A1 (en) | Method and device for roughening and electrolytically oxidizing foils or strips made of aluminum | |
DE2619426A1 (en) | PROCESS FOR THE REMOVAL OF ORGANIC AND THREE-VALUE CHROME PRODUCTS FROM CHROME-SULFUR ACID SOLUTIONS FROM THE PLASTIC FACILITY PROCESS | |
EP0638664A1 (en) | Process and apparatus for regenerating solutions containing metal ions and sulfuric acid | |
EP0280029B1 (en) | Simultaneous removal of heavy metals and oxidizable noxious compounds from waste water | |
DE2432354A1 (en) | METHOD OF PURIFYING WASTE WATER BY ELECTROLYSIS | |
DE1268245B (en) | Printed resistance and method of making it | |
DE2115687C3 (en) | Process for the continuous preparation of washing water resulting from galvanic or electroless metal deposition by electrodialysis | |
DE1521993B1 (en) | Process for regenerating a chromic acid solution for etching copper | |
DE2646590A1 (en) | Chromic acid bath regenerated by electrochemical oxidn. - and used for roughening plastics, esp. printed circuit boards | |
DE2540434C3 (en) | Process for the electroforming production of a sieve film for an electrically operated dry shaver | |
DE1963587A1 (en) | Process for the production of colored protective coatings on aluminum or aluminum alloys | |
DE3102585A1 (en) | METHOD FOR FORMING AN ELECTROLYTIC CHROME PREPARATION BY MEANS OF A THREE-VALUE CHROME CONTAINING BATH LIQUID | |
EP0291445A2 (en) | Process and apparatus for regenerating permanganate etch solutions | |
DE3135195A1 (en) | METHOD FOR THE ELECTROCHEMICAL DECOMPOSITION OF Nitric Acid | |
DE2404558C3 (en) | Process for the regeneration of exhausted, dissolved iron containing galvanic chromium baths by two-stage diaphragm electrolysis | |
EP0364688A1 (en) | Process and apparatus for manufacturing partially metallised foils | |
DE1517722C3 (en) | Device for the electrochemical reduction of waste water containing chromate and chromic acid | |
DE4022035C1 (en) | Decontamination process for removing nitrate(s), chromium and cadmium - includes acidifying medium to produce electroconductive iron (II) ions, redox-reacting iron and chromium ions, etc. | |
AT262472B (en) | Method and device for the recovery of coating material from the washing water in electro-coating plants | |
AT260817B (en) | Process and device for the electrochemical reduction of waste water containing chromate and chromic acid | |
DE1521993C (en) | Process for regenerating a chromic sulfuric acid solution for etching copper | |
AT288808B (en) | Process for electroplating, especially hard chrome plating |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
OD | Request for examination | ||
8220 | Willingness to grant licences (paragraph 23) | ||
C3 | Grant after two publication steps (3rd publication) |