SIST EN 23909:2000

Hardmetals - Determination of cobalt - Potentiometric method (ISO 3909:1976)

The method is applicable to carbides and binder metal powder mixtures, free of lubricant, all grades of presintered or sintered hardmetals, having a cobalt content exceeding 1 % (m/m). Gives principle, interfering elements, reagents, apparatus, sampling, procedure, expression of results and test report.

Hartmetalle - Bestimmung des Kobaltgehaltes - Potentiometerverfahren (ISO 3909:1976)

Métaux durs - Détermination du cobalt - Méthode potentiométrique (ISO 3909:1976)

La présente Norme Internationale spécifie une méthode potentiométrique pour la détermination du cobalt dans les métaux durs.
Cette méthode est applicable aux
mélanges de poudres de carbure et de métal liant non lubrifiés;
métaux durs de toutes nuances, préfrittés ou frittés, avec une teneur en cobalt supérieure à 1 % (m/m).

Hardmetals - Determination of cobalt - Potentiometric method (ISO 3909:1976)

General Information

• Status: Published
• Publication Date: 30-Nov-2000
• ICS: 77.160 - Powder metallurgy
• Technical Committee: SS SPL - Technical Board for the general field
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2000
• Due Date: 01-Dec-2000
• Completion Date: 01-Dec-2000
• Ref Project: EN 23909:1993 - Hardmetals - Determination of cobalt - Potentiometric method (ISO 3909:1976)

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Hardmetals - Determination of cobalt - Potentiometric method (ISO 3909:1976)Hartmetalle - Bestimmung des Kobaltgehaltes - Potentiometerverfahren (ISO 3909:1976)Métaux durs - Détermination du cobalt - Méthode potentiométrique (ISO 3909:1976)Hardmetals - Determination of cobalt - Potentiometric method (ISO 3909:1976)77.160Metalurgija prahovPowder metallurgyICS:Ta slovenski standard je istoveten z:EN 23909:1993SIST EN 23909:2000en01-december-2000SIST EN 23909:2000SLOVENSKI
STANDARD



SIST EN 23909:2000



SIST EN 23909:2000



SIST EN 23909:2000



INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION l MEXKAYHAPOfiHA(I OPTAHM3ALViR rf0 CTAHAAPTM3AI@iM~ORGANISATION INTERNATIONALE DE NORMALISATION Hardmetals - Determination of Cobalt - Potentiometric method Mktaux durs - Determination du Cobalt - Methode po ten tiometrique First edition - 1976-10-15 UDC 621.762 : 546.73 : 543.257.1 Ref. No. ISO 3909-1976 (E) Descriptors : powder metallurgy, sintered products, hardmetals, car bides, Chemical analysis, determination of content, Cobalt, potentiometric analysis. Price based on 3 pages SIST EN 23909:2000



ISO (the International Organization for Standardization) is a worldwide federation of national Standards institutes (ISO Member Bodies). The work of developing International Standards is carried out through ISO Technical Committees. Every Member Body interested in a subject for which a Technical Committee has been set up has the right to be represented on that Committee. International organizations, governmental and non-governmental, in Iiaison with ISO, also take part in the work. Draft International Standards adopted by the Technical Committees are circulated to the Member Bodies for approval before their acceptance as International Standards by the ISO Council. International Standard ISO 3909 was drawn up by Technical Committee lSO/TC 119, Powder metahrgical materials and products, and was circulated to the Member Bodies in July 1975. lt has been approved by the Member Bodies of the following countries : Austria Morocco Czechoslovakia Poland France Romania Germany South Africa, Rep. of I reland Spain Italy Sweden Turkey United Kingdom U.S.A. U.S.S.R. The Member Bodies of the document on technical grounds following countries expressed disapproval of the Australia Canada 0 International Organkation f or Standardkation, 1976 l Printed in Switzerland SIST EN 23909:2000



INTERNATIONAL STANDARD _ ISO 39094976 (E) Hardmetals - Determination of Cobalt - Potentiometric method 1 SCOPE This International Standard specif ies a potentiometric method for the determination of the Cobalt content of hardmetals. 2 FIELD OF APPLICATION This method is applicable to - carbides and binder metal powder mixtures, free of lubricant, - all grades of presintered or sintered hardmetals, having a Cobalt content exceeding 1 % (mlm). 3 PRINCIPLE Oxidation of Cobalt to the trivalent state in a strongly ammoniacal Solution with an excess of potassium hexa- cyanoferrate( I 11). Potentiometric back-titration of the excess with Cobalt sulphate Solution. 4 INTERFERING ELEIMENTS The effect of interfering elements, for example vanadium and manganese, shall be taken into account. Vanadium and manganese are also oxidized by hexacyanoferrate( I 11). Vanadium reacts stoichiometrically and a correction tan be applied if the vanadium content is below 0,5 % (mlm). Manganese reacts almost stoichiometrically up to 0,2 % (m/m) only if the sum of tantalum and niobum in the hardmetal is less than 0,02 % (mlm). Above this level the method is applicable only if the manganese content is less than 0,03 % (mlm). 5 REAGENTS During the analysis, use only reagents of recognized analytical grade and only distilled water or water of equiv- alent purity. 5.1 Ammonium sulphate. 5.2 Hydrochlorit acid, p 1 ,19 g/ml. 5.3 Hydrofluoric acid, p 1 ,12 g/ml. 5.4 Nitrit acid, p 1,42 g/ml. 5.5 Sulphuric acid, p 1,84 g/ml. 5.6 Ammonia Solution, p 0,91 g/ml. 5.7 Ammonium citrate Solution. Dissolve 100 g of citric acid in 900 ml of water and add 100 ml of the ammonia Solution (5.6). 5.8 Cobalt sulphate, Standard reference Solution contain- ing 3 g of Cobalt per litre. Prepare the Solution from compact metallic Cobalt, or from diammonium Cobalt sulphate, or from Cobalt sul- phate. If necessary, establish the titre gravimetrically with 1 nitroso-naphthol-2, or electrolytica
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