ISO 21339:2023

INTERNATIONAL ISO
STANDARD 21339
First edition
2023-09
6Al-4V titanium alloys —
Determination of aluminium and
vanadium contents — Inductively
coupled plasma atomic emission
spectrometric method
6Al-4V alliages de titane — Détermination de la teneur en aluminium
et en vanadium — Méthode par spectrométrie d'émission atomique
avec plasma à couplage inductif
Reference number
© ISO 2023
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ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 1
5.1 General . 1
5.2 Hydrochloric acid solution, 1+1 . 1
5.3 Nitric acid solution, 1+1. 2
5.4 Hydrofluoric acid solution, 1+1 . 2
5.5 Titanium . 2
5.6 Indium solution, 1 g/l . 2
5.7 Cobalt solution, 1 g/l . 2
5.8 Strontium solution, 1 g/l . 2
5.9 Aluminium standard solution, 1 g/l . 2
5.10 Vanadium standard solution, 1 g/l . 2
6 Apparatus . 2
6.1 General . 2
6.2 Volumetric glassware . 3
6.3 Plastic beaker, volumetric plastic flask and plastic watch glass . 3
6.4 Atomic emission spectrometer, equipped with an inductively coupled plasma
(ICP-AES) . 3
7 Sampling . 3
8 Procedure .3
8.1 Test portion . 3
8.2 Number of determinations . 3
8.3 Preparation of the calibration solutions . 3
8.4 Preparation of the test solutions . 4
8.5 Determination . 4
8.5.1 General . 4
8.5.2 Spectrometric measurements of the calibration solutions . 4
8.5.3 Spectrometric measurements of the test solutions . 5
9 Expression of result . 5
10 Precision . 6
11 Test report . 7
Annex A (informative) Additional information on the international inter-laboratory test .8
Annex B (informative) Graphical representation of the precision data. 9
Bibliography .11
iii
Foreword
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Subcommittee SC 11, Titanium.
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iv
INTERNATIONAL STANDARD ISO 21339:2023(E)
6Al-4V titanium alloys — Determination of aluminium and
vanadium contents — Inductively coupled plasma atomic
emission spectrometric method
1 Scope
This document specifies an inductively coupled plasma atomic emission spectrometric method for the
determination of the contents (mass fraction) of aluminium and vanadium in 6Al-4V titanium alloys.
This method is applicable to all kinds of 6Al-4V titanium alloys specified in ISO 23515 (designation of
titanium alloys) for aluminium in the range from 4,70 % to 7,00 % and vanadium in the range from
3,00 % to 5,00 %.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 648, Laboratory glassware — Single-volume pipettes
ISO 1042, Laboratory glassware — One-mark volumetric flasks
ISO 3696, Water for analytical laboratory use — Specification and test methods
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Principle
A test portion is dissolved with nitric and hydrofluoric acids. After suitable dilution and, if necessary,
addition of an internal standard element, the solution is nebulized into an inductively coupled plasma
atomic emission spectrometer and the intensity of the emitted light from each element is measured
(including, where relevant, the intensity of the internal standard element).
5 Reagents
5.1 General
During the analysis, unless otherwise stated, use only reagents of recognized analytical grade and only
grade 2 water as specified in ISO 3696.
5.2 Hydrochloric acid solution, 1+1
Add slowly 500 ml of hydrochloric acid (ρ 1,16 g/ml to 1,19 g/ml) to 500 ml of water and mix.
5.3 Nitric acid solution, 1+1
Add slowly 500 ml of nitric acid (ρ 1,42 g/ml) to 500 ml of water and mix.
5.4 Hydrofluoric acid solution, 1+1
Add, carefully and slowly, 100 ml of hydrofluoric acid (ρ 1,14 g/ml) to 100 ml of water and mix.
5.5 Titanium
High purity titanium [min 99,9 % (mass fraction)], containing less than or equal to 0,005 % (mass
fraction) of aluminium and vanadium.
5.6 Indium solution, 1 g/l
Weigh 1,000 g of high purity indium [min 99,9 % (mass fraction)]. Transfer it into a 300 ml beaker and
add 100 ml of hydrochloric acid (5.2) and 20 ml of nitric acid (5.3). Heat gently to complete dissolution.
Cool, transfer the solution quantitatively into a 1 000 ml one-mark volumetric flask, dilute to the
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