EP0039193A1 - Zusammensetzung zum Reinigen von Metall - Google Patents

Zusammensetzung zum Reinigen von Metall Download PDF

Info

Publication number
EP0039193A1
EP0039193A1 EP81301750A EP81301750A EP0039193A1 EP 0039193 A1 EP0039193 A1 EP 0039193A1 EP 81301750 A EP81301750 A EP 81301750A EP 81301750 A EP81301750 A EP 81301750A EP 0039193 A1 EP0039193 A1 EP 0039193A1
Authority
EP
European Patent Office
Prior art keywords
cleaning composition
metal
composition according
alkali
cleaning
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.)
Withdrawn
Application number
EP81301750A
Other languages
English (en)
French (fr)
Inventor
Dennis Bibby Jackson
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.)
Crown and Andrews Pty Ltd
Original Assignee
Crown and Andrews Pty Ltd
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 Crown and Andrews Pty Ltd filed Critical Crown and Andrews Pty Ltd
Publication of EP0039193A1 publication Critical patent/EP0039193A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/02—Inorganic compounds ; Elemental compounds
    • C11D3/12—Water-insoluble compounds
    • C11D3/1206—Water-insoluble compounds free metals, e.g. aluminium grit or flakes
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
    • C23G1/20—Other heavy metals

Definitions

  • the present invention relates to a composition for and a method of removing dirt and tarnish film from metals, and especially from silver.
  • Cleaning compositions for silver such as abrasive polishes and silver dips, are known, but are either time consuming in use, suffer from other disadvantages such as damage to the metal surface from the abrasive or their possible detrimental effect on other metals.
  • a cleaning composition comprising a metal powder together with a base and, optionally, a surfactant.
  • the metal powder is aluminium powder, although the powder of any metal which is soluble in alkaline conditions with the evolution of hydrogen, and which is capable of reducing the cations of heavy metals - such as silver - to the metallic state, should suffice.
  • the base is preferably Trisodium Phosphate (TSP), N a 3 P0 4 .12H 2 0 or Na 3 P0 4 .8H 2 o, which is freely soluble in hot water.
  • TSP Trisodium Phosphate
  • Aqueous solutions of TSP are strongly alkaline, with a 1% aqueous solution having a pH of 11.9.
  • Commercial grade TSP sometimes yields a more alkaline solution due to the use of excess alkali in manufacture to prevent caking of the crystals.
  • the surfactant or wetting agent is normally selected from conventional surfactants used in the detergent making art, such as soaps and sulphated or sulphonated synthetic detergents.
  • the metal powder is normally present in an amount of from 0.5 to 10% by weight of the composition, and the surface active agent is normally present in an amount of from 0.5 to 15% by weight of the composition.
  • a preferred composition in accordance with the present invention comprises:
  • the tarnish on silver is silver sulphide A 92 S resulting from the interaction of the Ag metal with sulphurous compounds in the atmosphere, such as Hydrogen Sulphide H 2 S.
  • compositions according to the present invention 100 gms of the composition can be dissolved in two litres of hot water and the articles to be cleaned immersed in the solution for about 5 to 10 minutes, depending on the degree of the tarnish. The articles are then removed from the solution, rinsed and dried.
  • the solution as described above will remain active for about 20 minutes and is suitable for cleaning at least 50 pieces of cutlery, jewellery, and the like.
  • the solution will clean heavily decorated silver as easily as plain silver. Small trinkets that are normally hard to handle are cleaned efficiently and effectively; when removed from solution they are simply rinsed and dried. The silver is effectively cleaned without the need for polishing i.e. there is none of the mess and time consuming labour required with conventional polishing compositions.
  • the cleaning composition is safe to handle and will not affect the metal being cleaned.
  • the hydrogen created acts only on the sulphide tarnish layer and has no effect on the metal, even if the metal articles are left in solution for an extended period.
  • the cleaning composition according to the present invention is preferably packaged, in powder form in a sachet, ready for use by dissolving in water.
  • aqueous solution the aluminium powder is dissolved with the release of hydrogen gas bubbles.
  • the hydrogen gas interacts with the sulphide film on the silver goods which dissolves the sulphide layer.
  • Aluminium Sulphide A1 2 S 3 it is possibly some formation of Aluminium Sulphide A1 2 S 3 but this is not stable and decomposes in the aqueous solution.
  • the surfactant acts in solution to remove any grease and dirt from the articles to be cleaned, thus allowing the hydrogen to interact with the sulphide film.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Detergent Compositions (AREA)
EP81301750A 1980-04-28 1981-04-21 Zusammensetzung zum Reinigen von Metall Withdrawn EP0039193A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU331080 1980-04-28
AU3310/80 1980-04-28

Publications (1)

Publication Number Publication Date
EP0039193A1 true EP0039193A1 (de) 1981-11-04

Family

ID=3693767

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81301750A Withdrawn EP0039193A1 (de) 1980-04-28 1981-04-21 Zusammensetzung zum Reinigen von Metall

Country Status (1)

Country Link
EP (1) EP0039193A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986006760A1 (en) * 1985-05-14 1986-11-20 Howard Marc Gold Article and method for tarnish removal
GB2313844A (en) * 1996-06-08 1997-12-10 Reckitt & Colmann Prod Ltd Cleaning composition
GB2325243A (en) * 1997-05-13 1998-11-18 Procter & Gamble Removing tarnish from tarnished silverware
GB2457131A (en) * 2007-12-12 2009-08-12 Innovation Patents Ltd Silver article and method of cleaning a silver article

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH48976A (de) * 1909-07-19 1910-12-16 Kohler A M Verfahren zum Blankmachen von Metalloberflächen besitzenden Gegenständen
AT63365B (de) * 1911-07-26 1914-02-10 Augustus Rosenberg Verfahren und Masse zum Reinigen von Gegenständen aus Silber und dgl. Metallen.
DE1932337A1 (de) * 1969-06-26 1971-01-07 Bm Chemie Backenkoehler & Von Mittel zur Reinigung bzw. Pflege von Metallen,insbesondere Gold und Silber

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH48976A (de) * 1909-07-19 1910-12-16 Kohler A M Verfahren zum Blankmachen von Metalloberflächen besitzenden Gegenständen
AT63365B (de) * 1911-07-26 1914-02-10 Augustus Rosenberg Verfahren und Masse zum Reinigen von Gegenständen aus Silber und dgl. Metallen.
DE1932337A1 (de) * 1969-06-26 1971-01-07 Bm Chemie Backenkoehler & Von Mittel zur Reinigung bzw. Pflege von Metallen,insbesondere Gold und Silber

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986006760A1 (en) * 1985-05-14 1986-11-20 Howard Marc Gold Article and method for tarnish removal
AU580167B2 (en) * 1985-05-14 1989-01-05 Howard Marc Gold Article and method for tarnish removal
GB2313844A (en) * 1996-06-08 1997-12-10 Reckitt & Colmann Prod Ltd Cleaning composition
US5958854A (en) * 1996-06-08 1999-09-28 Reckitt & Colman Products Limited Silver polish formulation containing thiourea
GB2325243A (en) * 1997-05-13 1998-11-18 Procter & Gamble Removing tarnish from tarnished silverware
WO1998051769A1 (en) * 1997-05-13 1998-11-19 The Procter & Gamble Company Process for removing tarnish from tarnished silverware
GB2457131A (en) * 2007-12-12 2009-08-12 Innovation Patents Ltd Silver article and method of cleaning a silver article

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB NL

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19821012

RIN1 Information on inventor provided before grant (corrected)

Inventor name: JACKSON, DENNIS BIBBY