EN ISO 21968:2019
(Main)Non-magnetic metallic coatings on metallic and non-metallic basis materials - Measurement of coating thickness - Phase-sensitive eddy-current method (ISO 21968:2019)
Non-magnetic metallic coatings on metallic and non-metallic basis materials - Measurement of coating thickness - Phase-sensitive eddy-current method (ISO 21968:2019)
This document specifies a method for using phase-sensitive eddy-current instruments for non-destructive measurements of the thickness of non-magnetic metallic coatings on metallic and non-metallic basis materials such as:
a) zinc, cadmium, copper, tin or chromium on steel;
b) copper or silver on composite materials.
The phase-sensitive method can be applied without thickness errors to smaller surface areas and to stronger surface curvatures than the amplitude-sensitive eddy-current method specified in ISO 2360, and is less affected by the magnetic properties of the basis material. However, the phase-sensitive method is more affected by the electrical properties of the coating materials.
In this document, the term "coating" is used for materials such as, for example, paints and varnishes, electroplated coatings, enamel coatings, plastic coatings, claddings and powder coatings.
This method is particularly applicable to measurements of the thickness of metallic coatings. These coatings can be non-magnetic metallic coatings on non-conductive, conductive or magnetic base materials, but also magnetic coatings on non-conductive or conductive base materials.
The measurement of metallic coatings on metallic basis material works only when the product of conductivity and permeability (σ, μ) of one of the materials is at least a factor of two times the product of conductivity and permeability for the other material. Non-ferromagnetic materials have a relative permeability of one.
Nichtmagnetische metallische Überzüge auf metallischen und nichtmetallischen Grundwerkstoffen - Messung der Schichtdicke - Phasensensitives Wirbelstromverfahren (ISO 21968:2019)
Dieses Dokument legt ein Verfahren unter Anwendung phasensensitiver Wirbelstromgeräte zur zerstörungsfreien Messung der Dicke nichtmagnetischer metallischer Überzüge auf metallischen und nichtmetallischen Grundwerkstoffen fest, wie beispielsweise:
a) Zink, Cadmium, Kupfer, Zinn oder Chrom auf Stahl;
b) Kupfer oder Silber auf Verbundwerkstoffen.
Das phasensensitive Verfahren kann ohne Schichtdickenfehler auf kleinere Oberflächen und stärkere Oberflächenkrümmungen angewendet werden als das nach ISO 2360 festgelegte amplitudensensitive Wirbel¬stromverfahren und wird weniger stark durch die magnetischen Eigenschaften des Grundwerkstoffs beeinflusst. Dagegen wird das phasensensitive Verfahren stärker durch die elektrischen Eigenschaften des Schichtwerkstoffs beeinflusst.
In diesem Dokument wird der Begriff „Beschichtung“ bzw. „Überzug“ verwendet für z. B. Lacke und Anstrichstoffe, galvanische Überzüge, Email, Kunststoffschichten, Umhüllungen und Pulverlacke.
Dieses Verfahren ist besonders für Messungen der Dicke metallischer Überzüge geeignet. Diese Überzüge können nichtmagnetische metallische Überzüge auf nichtleitenden, leitenden oder magnetischen Grundwerkstoffen sein, aber auch magnetische Überzüge auf nichtleitenden oder leitenden Grundwerkstoffen.
Die Messung von metallischen Überzügen auf metallischem Grundwerkstoff funktioniert nur, wenn das Produkt der Leitfähigkeit und der Permeabilität (σ, µ) eines der Werkstoffe mindestens das Zweifache des Produktes der Leitfähigkeit und der Permeabilität des anderen Werkstoffs beträgt. Nichtferromagnetische Werkstoffe haben eine relative Permeabilität von 1.
Revêtements métalliques non magnétiques sur des matériaux de base métalliques et non métalliques - Mesurage de l'épaisseur de revêtement - Méthode par courants de Foucault sensible aux variations de phase (ISO 21968:2019)
Le présent document spécifie une méthode utilisant des instruments fonctionnant par courants de Foucault sensibles aux variations de phase pour le mesurage non destructif de l'épaisseur des revêtements métalliques non magnétiques sur des matériaux de base métalliques et non métalliques, tels que:
a) le zinc, le cadmium, le cuivre, l'étain ou le chrome sur de l'acier;
b) le cuivre ou l'argent sur des matériaux composites.
La méthode sensible aux variations de phase peut être appliquée sans erreur d'épaisseur à des surfaces planes plus petites et à des surfaces courbes plus accentuées que la méthode par courants de Foucault sensible aux variations d'amplitude, spécifiée dans l'ISO 2360, et est moins affectée par les propriétés magnétiques du matériau de base. Toutefois, la méthode sensible aux variations de phase est davantage affectée par les propriétés électriques des matériaux de revêtement.
Dans le présent document, le terme «revêtement» est utilisé pour désigner des produits tels que, par exemple, les peintures et vernis, les revêtements électrolytiques, les revêtements en émaux, les revêtements plastiques, les placages et les revêtements en poudre.
Cette méthode s'applique tout notamment au mesurage de l'épaisseur des revêtements métalliques. Ces revêtements peuvent être des revêtements métalliques non magnétiques sur des matériaux de base non conducteurs, conducteurs ou magnétiques, mais aussi des revêtements magnétiques sur des matériaux de base non conducteurs ou conducteurs.
Le mesurage des revêtements métalliques sur des matériaux de base métalliques ne fonctionne que lorsque le produit de la conductivité et de la perméabilité (σ, μ) de l'un des matériaux représente au moins deux fois le produit de la conductivité et de la perméabilité de l'autre matériau. Les matériaux non ferromagnétiques ont une perméabilité relative de un.
Nemagnetne kovinske prevleke na kovinskih in nekovinskih osnovnih materialih - Merjenje debeline nanosa prevleke - Metoda vrtinčnih tokov (ISO 21968:2019)
Ta dokument določa metodo za uporabo fazno občutljivih instrumentov za preiskave z vrtinčnimi tokovi za neporušitvene meritve debeline nemagnetnih kovinskih prevlek na kovinskih in nekovinskih osnovnih materialih, kot so: a) cink, kadmij, baker, kositer ali krom na jeklu; b) baker ali srebro na kompozitnih materialih. Fazno občutljivo metodo je mogoče uporabiti brez napak debeline na manjših površinah in na večjih ukrivljenostih površine kot metodo vrtinčnih tokov, občutljivo za spremembe amplitude, ki je določena v standardu ISO 2360, pri čemer nanjo manj vplivajo magnetne lastnosti osnovnega materiala. Vendar pa na fazno občutljivo metodo bolj vplivajo električne lastnosti premazov. V tem dokumentu se izraz »prevleka« uporablja za materiale, kot so barve in laki, elektrolitske prevleke, emajlirane prevleke, plastične prevleke, obloge in praškaste prevleke. Ta metoda je še posebej uporabna za meritve debeline kovinskih prevlek. Te prevleke so lahko nemagnetne kovinske prevleke na neprevodnih, prevodnih ali magnetnih osnovnih materialih in tudi magnetne prevleke na neprevodnih ali prevodnih osnovnih materialih. Merjenje kovinskih prevlek na kovinskih osnovnih materialih deluje samo, ko je zmnožek prevodnosti in prepustnosti (s, μ) enega od materialov najmanj faktor dvakratnega zmnožka prevodnosti in prepustnosti drugega materiala. Relativna prepustnost neferomagnetnih materialov je enaka vrednosti ena.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2019
Nadomešča:
SIST EN ISO 21968:2005
Nemagnetne kovinske prevleke na kovinskih in nekovinskih osnovnih materialih -
Merjenje debeline nanosa prevleke - Metoda vrtinčnih tokov (ISO 21968:2019)
Non-magnetic metallic coatings on metallic and non-metallic basis materials -
Measurement of coating thickness - Phase-sensitive eddy-current method (ISO
21968:2019)
Nichtmagnetische metallische Überzüge auf metallischen und nichtmetallischen
Grundwerkstoffen - Messung der Schichtdicke - Phasensensitives Wirbelstromverfahren
(ISO 21968:2019)
Revêtements métalliques non magnétiques sur des matériaux de base métalliques et
non métalliques - Mesurage de l'épaisseur de revêtement - Méthode par courants de
Foucault sensible aux variations de phase (ISO 21968:2019)
Ta slovenski standard je istoveten z: EN ISO 21968:2019
ICS:
25.220.40 Kovinske prevleke Metallic coatings
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 21968
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2019
EUROPÄISCHE NORM
ICS 25.220.40 Supersedes EN ISO 21968:2005
English Version
Non-magnetic metallic coatings on metallic and non-
metallic basis materials - Measurement of coating
thickness - Phase-sensitive eddy-current method (ISO
21968:2019)
Revêtements métalliques non magnétiques sur des Nichtmagnetische metallische Überzüge auf
matériaux de base métalliques et non métalliques - metallischen und nichtmetallischen Grundwerkstoffen
Mesurage de l'épaisseur de revêtement - Méthode par - Messung der Schichtdicke - Phasensensitives
courants de Foucault sensible aux variations de phase Wirbelstromverfahren (ISO 21968:2019)
(ISO 21968:2019)
This European Standard was approved by CEN on 15 September 2019.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 21968:2019 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 21968:2019) has been prepared by Technical Committee ISO/TC 107 "Metallic
and other inorganic coatings" in collaboration with Technical Committee CEN/TC 262 “Metallic and
other inorganic coatings, including for corrosion protection and corrosion testing of metals and alloys”
the secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by April 2020, and conflicting national standards shall be
withdrawn at the latest by April 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 21968:2005.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 21968:2019 has been approved by CEN as EN ISO 21968:2019 without any modification.
INTERNATIONAL ISO
STANDARD 21968
Second edition
2019-09
Non-magnetic metallic coatings
on metallic and non-metallic basis
materials — Measurement of coating
thickness — Phase-sensitive eddy-
current method
Revêtements métalliques non magnétiques sur des matériaux de
base métalliques et non métalliques — Mesurage de l'épaisseur
de revêtement — Méthode par courants de Foucault sensible aux
variations de phase
Reference number
ISO 21968:2019(E)
©
ISO 2019
ISO 21968:2019(E)
© ISO 2019
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Published in Switzerland
ii © ISO 2019 – All rights reserved
ISO 21968:2019(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle of measurement . 2
5 Factors affecting measurement uncertainty . 5
5.1 Basic influence of the coating thickness . 5
5.2 Electrical properties of the coating . 5
5.3 Geometry — Base material thickness . 5
5.4 Geometry — Edge effects . 5
5.5 Geometry — Surface curvature . 6
5.6 Surface roughness . 6
5.7 Lift-off effect . 6
5.8 Probe pressure . 8
5.9 Probe tilt . 8
5.10 Temperature effects . 8
5.11 Intermediate coatings . 8
5.12 External electromagnetic fields . 8
6 Calibration and adjustment of the instrument . 8
6.1 General . 8
6.2 Thickness reference standards . 9
6.3 Methods of adjustment . 9
7 Measurement procedure and evaluation .10
7.1 General .10
7.2 Number of measurements and evaluation .10
8 Uncertainty of the results .11
8.1 General remarks .11
8.2 Uncertainty of the calibration of the instrument .11
8.3 Stochastic errors .12
8.4 Uncertainties caused by factors summarized in Clause 5 .13
8.5 Combined uncertainty, expanded uncertainty and final result .13
9 Precision .14
9.1 General .14
9.2 Repeatability (r) .14
9.3 Reproducibility limit (R) .16
10 Test report .17
Annex A (informative) Eddy-current generation in a metallic conductor .18
Annex B (informative) Basics of the determination of the uncertainty of a measurement of
the used measurement method corresponding to ISO/IEC Guide 98-3 .24
Annex C (informative) Basic performance requirements for coating thickness gauges based
on the phase-sensitive eddy-current method described in this document .26
Annex D (informative) Examples for the experimental estimation of factors affecting the
measurement accuracy .28
Annex E (informative) Table of the student factor .33
Annex F (informative) Example of uncertainty estimation .
...
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