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)

Overview

SIST EN 23909:2000, aligned with ISO 3909:1976, specifies the potentiometric method for determining cobalt content in hardmetals. This standardized chemical analysis method is crucial in materials science and powder metallurgy for ensuring quality control of carbides and binder metal powder mixtures. Applicable to all grades of presintered or sintered hardmetals containing more than 1% cobalt by mass, this method provides precise, reproducible results essential for manufacturing and research in hardmetal production.

Key Topics

  • Scope and Application

    • Applies to carbides and binder metal powders free of lubricants
    • Suitable for hardmetals with cobalt content exceeding 1% (m/m)
    • Covers sintered and presintered hardmetal grades

  • Analytical Principle

    • Oxidation of cobalt to the trivalent state in an ammoniacal solution
    • Use of potassium hexacyanoferrate(III) to oxidize cobalt
    • Potentiometric back-titration of excess titrant with cobalt sulfate solution

  • Interfering Elements

    • Vanadium and manganese may interfere due to their oxidation by hexacyanoferrate(III)
    • Correction protocols exist for vanadium below 0.5% and manganese under specific concentration thresholds

  • Reagents and Apparatus

    • High-purity reagents like ammonium sulfate, hydrochloric acid, hydrofluoric acid, and ammonia solution
    • Standardized cobalt sulfate and potassium hexacyanoferrate(III) solutions
    • Laboratory apparatus includes potentiometric titration setup, platinum electrodes, and precision burettes

  • Sampling and Preparation

    • Samples must be powdered and sieved to 0.18 mm
    • Multiple test portions (2-3) to ensure reproducibility

  • Procedure Highlights

    • Complete dissolution of test portion using acid digestion methods
    • Neutralization to pH 3-5 before titration
    • Precise titration with potentiometric endpoint detection
    • Detailed calculation formula for cobalt content expression

  • Results and Reporting

    • Calculation includes corrections for vanadium and manganese interference
    • Tolerances for repeatability defined based on cobalt concentration ranges
    • Final result reported as the arithmetic mean rounded to the nearest 0.1%
    • Comprehensive test report including sample details, method reference, result, and any deviations

Applications

  • Quality Control in Hardmetal Manufacturing
    This standard is critical for manufacturers of cemented carbides and metal binders to verify cobalt content, a key component influencing mechanical properties such as hardness, toughness, and wear resistance.

  • Powder Metallurgy Research
    Laboratories conducting research on hardmetal composites rely on EN 23909 for consistent cobalt quantification, ensuring experimental reproducibility and benchmarking.

  • Material Certification and Compliance
    Testing to this method supports compliance with international specifications and customer requirements, enabling traceability and certification of material quality.

  • Automotive, Aerospace, and Tooling Industries
    As hardmetals are extensively used in cutting tools, wear parts, and industrial applications, this method underpins the reliable assessment of material grades critical for performance and safety.

Related Standards

  • ISO 3909:1976
    The original international standard providing the potentiometric determination of cobalt in hardmetals – EN 23909 is identical in technical content.

  • Standards on Powder Metallurgy
    EN 23909 complements other powder metallurgy standards detailing sampling, preparation, and testing methods for hardmetal components.

  • Chemical Analysis Standards for Metals
    Related ISO and CEN standards cover gravimetric and spectrometric methods for cobalt determination, offering alternative or confirmatory techniques.

Keywords: SIST EN 23909:2000, ISO 3909:1976, cobalt determination, potentiometric method, hardmetals, carbides, powder metallurgy, cobalt content analysis, sintered hardmetals, chemical analysis, quality control, material testing.

Frequently Asked Questions

SIST EN 23909:2000 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Hardmetals - Determination of cobalt - Potentiometric method (ISO 3909:1976)". This standard covers: 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.

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.

SIST EN 23909:2000 is classified under the following ICS (International Classification for Standards) categories: 77.160 - Powder metallurgy. The ICS classification helps identify the subject area and facilitates finding related standards.

You can purchase SIST EN 23909:2000 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of SIST standards.

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
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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