DE1808780A1 - Bath for electrolytic removal of galvanic coatings - Google Patents

Bath for electrolytic removal of galvanic coatings

Info

Publication number
DE1808780A1
DE1808780A1 DE19681808780 DE1808780A DE1808780A1 DE 1808780 A1 DE1808780 A1 DE 1808780A1 DE 19681808780 DE19681808780 DE 19681808780 DE 1808780 A DE1808780 A DE 1808780A DE 1808780 A1 DE1808780 A1 DE 1808780A1
Authority
DE
Germany
Prior art keywords
bath
nitrophenol
phenol
electrolytic removal
coatings
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
Application number
DE19681808780
Other languages
German (de)
Inventor
Horst Dillenberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dillenberg Bergische Metall
Original Assignee
Dillenberg Bergische Metall
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dillenberg Bergische Metall filed Critical Dillenberg Bergische Metall
Priority to DE19681808780 priority Critical patent/DE1808780A1/en
Publication of DE1808780A1 publication Critical patent/DE1808780A1/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F5/00—Electrolytic stripping of metallic layers or coatings

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

Electrolytic removal of electrodeposited coatings from iron-containing substrates Bath is aqueous Na, K, Ca or ammonium nitrate with phenol and/or nitrophenol, as in main patent. Phenol and/or nitrophenol content is 0.5-10 vol.% Used e.g. to remove faulty plating before re-plating camera bodies.

Description

Bad zum elektrolytischen Ablösen galvanischer Niederschläge von eisenhaltizen Grundkörpern. Bath for the electrolytic removal of galvanic deposits from iron deposits Basic bodies.

Das Hauptpatent e ** e ... (Patentanmeldung P 12 81 217.8-45) bezieht sich auf ein Bad zum elektrolytischen Ablösen galvanischer Niederschläge von eisenhaltigen Grundkörpern, welches aus einer wässrigen Lösung pon Natrium-, Kalium-, Kalzium- oder Ammoniumnitrat besteht und zusätzlich Phenol und/oder Nitrophenol in einer Menge von 0,1 bis 0,5 Volumenprozent enthält.The main patent e ** e ... (patent application P 12 81 217.8-45) refers on a bath for the electrolytic removal of galvanic deposits from ferrous Basic bodies, which from an aqueous solution of sodium, potassium, calcium or ammonium nitrate and additionally phenol and / or nitrophenol in one Contains amount from 0.1 to 0.5 percent by volume.

Das Hauptpatent befaßt sich mit den Problemen, die beim elektrolytischen Ablösen galvanischer Niederschläge von eisenhaltigen Grundkörpern auftreten. Wenn beim galvanischen tberziehen von Gegenstanden, z.B. von Autostoßstngen der Eameragehäusen, die tberzüge defekt ausfallen, so müssen diese defekten Uberzüge zunächst wieder abgelöst werden,. ehe die Gegenstände erneut galvanisch überzogen werden können.The main patent deals with the problems associated with electrolytic Detachment of galvanic deposits from ferrous bodies occur. if during the galvanic coating of objects, e.g. car bumpers of the camera housing, the If the coatings are defective, these defective coatings must first be removed will,. before the objects can be electroplated again.

Solche defekten Uberzüge lassen sich auf elektrolytischem Wege ablösen, wobei der zu behandelnde Gegenstand als Anode in ein galvanisches Bad eingetaucht wird. Von den vielen, für diesen Zweck bereits bekannten Bädern eignen sich am besten solche aus einer wässrigen Lösung von Natrium-, Kalium-, Ealzium- oder Ammoniumnitrat, die gemäß der Lehre des Hauptpatentes zusätzlich Phenol und/oder Nitrophenol enthalten, Durch den Zusatz von Phenol oder Nitrophenol zum Bad werden die Streuung und Tiefenwirkung beim elektrolytischen Ablösen sehr verbessert, so daß bei sehr kompliziert gestalteten Gegenständen in allen Ecken und Winkelbereichen eine vollständige Ablösung der galvanischen Uberzüge erreicht wird.Such defective coatings can be removed electrolytically, the object to be treated being immersed as an anode in an electroplating bath will. Of the many baths already known for this purpose, the best ones are those from an aqueous solution of sodium, potassium, Ealzium- or ammonium nitrate, which according to the teaching of the main patent additionally contain phenol and / or nitrophenol, The addition of phenol or nitrophenol to the bath increases the diffusion and depth effect very improved in electrolytic stripping, so that in very complicated designs Objects in all corners and angles a complete separation of the galvanic Coatings is achieved.

Darüber hinaus wirkt das zugesetzte Phenol oder Nitrophenol als ein Beschleuniger, was insbesondere beim Ablösen von Matt- oder Halbglanznickel in Erscheinung tritt. Während Matt- oder Halbglanznickelüberzüge mit einem lediglich Ammoniumnitrat enthaltenden Bad erst über Stunden oder Tage hinweg abgelöst werden können, wird durch das zugesetzte Phenol oder Nitrophenol die Ablösezeit bis auf 10 bis 20 Minuten verringert.In addition, the added phenol or nitrophenol acts as a Accelerator, which is particularly evident when removing matt or semi-gloss nickel occurs. While matt or semi-gloss nickel coatings with an ammonium nitrate only containing bath can only be removed for hours or days the added phenol or nitrophenol reduces the detachment time to 10 to 20 minutes decreased.

Der Erfindung liegt die Aufgabe zugrunde, weitere Bäder anzugeben, die die gleichen Vorteile wie das Bad nach dem Hauptpatent erbringen. Gemäß vorliegender Erfindung enthält das Bad Phenol und/oder Nitrophenol in einer Menge von mehr als 0,5 Volumenprozent bis hinauf zu etwa 10 Volumenprozent.The invention is based on the object of specifying further baths, which provide the same advantages as the bathroom according to the main patent. According to the present Invention contains the bath phenol and / or nitrophenol in an amount of more than 0.5 percent by volume up to about 10 percent by volume.

Es hat sich gezeigt, daß auch bei diesen - im Vergleich zum Hauptpatent - größeren Konzentrationsteilen an Phenol und/oder Nitrophenol die Streuung und Tiefenwirkung beim elektrolytischen Ablösen und die Beschleunigung beim Ablösen insbesondere von Matt- oder Halbglanznickel beträchtlich gegenüber Bädern verbessert werden, die lediglich aus einer wässrigen Lösung von Natrium-, Kalium-, Ealzium- oder Mnmoniumnitrat bestehen.It has been shown that even with these - in comparison to the main patent - larger parts of the concentration of phenol and / or nitrophenol the scatter and In-depth effect in electrolytic peeling and the acceleration in peeling in particular of matt or semi-gloss nickel considerably improved compared to baths that are made up only of an aqueous solution of sodium, potassium, Ealzium- or ammonium nitrate.

Claims (1)

Patentanspruch Claim Bad zum elektrolytischen Ablösen galvanischer Uberzüge von eisenhaltigen Grundkörpern, bestehend aus einer wässrigen Lösung von Natrium-, Kalium-, Kalzium- oder Ammoniumnitrat mit einem Gehalt an Phenol und/oder Nitrophenol nach Patent . ... ..c (Patentanmeldung P 12 81 217.8-45), dadurch gekennzeichnet, daß das Bad Phenol und/oder Nitrophenol in einer enge von mehr als 0,5 Volumenprozent bis hinauf zu etwa 10 Volumenprozent enthält.Bath for the electrolytic removal of galvanic coatings from ferrous ones Basic bodies, consisting of an aqueous solution of sodium, potassium, calcium or ammonium nitrate containing phenol and / or nitrophenol according to the patent . ... ..c (patent application P 12 81 217.8-45), characterized in that the bath Phenol and / or nitrophenol in a narrow range of more than 0.5 percent by volume up to contains about 10 percent by volume.
DE19681808780 1968-11-14 1968-11-14 Bath for electrolytic removal of galvanic coatings Pending DE1808780A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19681808780 DE1808780A1 (en) 1968-11-14 1968-11-14 Bath for electrolytic removal of galvanic coatings

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681808780 DE1808780A1 (en) 1968-11-14 1968-11-14 Bath for electrolytic removal of galvanic coatings

Publications (1)

Publication Number Publication Date
DE1808780A1 true DE1808780A1 (en) 1970-06-04

Family

ID=5713266

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19681808780 Pending DE1808780A1 (en) 1968-11-14 1968-11-14 Bath for electrolytic removal of galvanic coatings

Country Status (1)

Country Link
DE (1) DE1808780A1 (en)

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