EN 16813:2016

Thermal spraying - Measurement of the electrical conductivity of thermal sprayed non-iron metal coatings by means of eddy current method

This European standard specifies the procedure of the measurement of the electrical conductivity of non-Ferro-magnetic thermal sprayed coatings. By this measurement the absolute value of the electrical conductivity in the coating sprayed on component can be determined as well as also deviations from the agreed rated value can be used to control a running production. With that, a remarkable contribution can be applied to process and quality assurance measures of a manufacture process.

Thermisches Spritzen - Messung der elektrischen Leitfähigkeit thermisch gespritzter Nichteisenmetall-Schichten mittels Wirbelstromverfahren

Diese Europäische Norm legt die Vorgehensweise zur Messung der elektrischen Leitfähigkeit von nicht ferro-magnetischen thermisch gespritzten Schichten fest. Mit der Messung kann sowohl die absolute elektrische Leitfähigkeit in der Schicht auf einem Bauteil bestimmt werden als auch Abweichungen von einem vereinbarten Sollwert für die Kontrolle einer laufenden Fertigung. Damit kann ein entscheidender Beitrag zur Prozess- und Qualitätssicherung einer Fertigung geleistet werden.

Projection thermique - Mesurage de la conductivité électrique des revêtements métalliques non ferreux obtenus par projection thermique, à l'aide de la méthode par courants de Foucault

La présente Norme européenne spécifie la méthode de mesurage de la conductivité électrique des matériaux non ferromagnétiques obtenus par projection thermique. Cette méthode de mesurage permet de déterminer la valeur absolue de la conductivité électrique dans le revêtement appliqué par projection sur un composant et d'utiliser les écarts par rapport à la valeur nominale convenue pour contrôler une production en cours. Cela apporte une contribution notable à l'application d'un procédé de fabrication et aux mesures d'assurance de la qualité.

Vroče brizganje - Merjenje električne prevodnosti vroče brizganih neželeznih prevlek z metodo vrtinčnih tokov

Ta Evropski standard določa postopek merjenja električne prevodnosti vroče brizganih neferomagnetnih prevlek. S tem merjenjem je mogoče določiti absolutno vrednost električne prevodnosti v prevleki, brizgani na sestavni del, hkrati pa se lahko za nadzor proizvodnje v teku uporabijo odstopanja od dogovorjene nazivne vrednosti. S tem se lahko doseže opazen prispevek k meritvam procesa in zagotavljanju kakovosti izdelave.

General Information

• Status: Published
• Publication Date: 15-Nov-2016
• Withdrawal Date: 30-May-2017
• ICS: 25.220.20 - Surface treatment
• Technical Committee: CEN/TC 240 - Thermal spraying and thermally spraying coatings
• Drafting Committee: CEN/TC 240 - Thermal spraying and thermally spraying coatings
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Completion Date: 14-Jun-2022
• Ref Project: SIST EN 16813:2017 - Thermal spraying - Measurement of the electrical conductivity of thermal sprayed non-iron metal coatings by means of eddy current method

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Thermisches Spritzen - Messung der elektrischen Leitfähigkeit thermisch gespritzter Nichteisenmetall-Schichten mittels WirbelstromverfahrenProjection thermique - Mesurage de la conductivité électrique des revêtements métalliques non ferreux obtenus par projection thermique, à l'aide de la méthode par courants de FoucaultThermal spraying - Measurement of the electrical conductivity of thermal sprayed non-iron metal coatings by means of eddy current method25.220.20Površinska obdelavaSurface treatment17.220.99Drugi standardi v zvezi z elektriko in magnetizmomOther standards related to electricity and magnetismICS:Ta slovenski standard je istoveten z:EN 16813:2016SIST EN 16813:2017en,fr,de01-februar-2017SIST EN 16813:2017SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 16813
November
t r s x ICS
t wä t t rä t r English Version
Thermal spraying æ Measurement of the electrical conductivity of thermal sprayed nonæiron metal coatings by means of eddy current method Projection thermique æ Mesurage de la conductivité électrique des revêtements métalliques non ferreux obtenus par projection thermiqueá à l 5aide de la méthode par courants de Foucault
Thermisches Spritzen æ Messung der elektrischen Leitfähigkeit thermisch gespritzter NichteisenmetallæSchichten mittels Wirbelstromverfahren This European Standard was approved by CEN on
t v September
t r s xä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey andUnited Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels
t r s x CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s x z s uã t r s x ESIST EN 16813:2017

Record for the applied Electrical Conductivity Measurement . 12 A.1 General . 12 A.2 Component/part . 12 A.3 Surface preparation for spraying . 12 A.4 Spraying procedure for component/part . 12 A.5 Preparation of measurement . 13 A.6 Measuring instrument . 13 A.7 Result of the measured electrical conductivity . 13 Bibliography . 14
physical value, which shows the ability of a material – in this case of a thermal sprayed coating – to conduct the current Note 1 to entry: It is defined to be the constant of proportionality between the current density and the electrical field intensity within the general Formula (1) of the ohmic law.
is measured in S/m. ×=J (1) where
J is the current density;
is the electrical conductivity;
E is the field intensity. 3.2 electrical resistance R value, which defines the electrical voltage, which is needed that a certain current can flow through an electrical conductor Note 1 to entry:
× m). =×AL (2) where
× m;
R is the ohmic resistance;
A is the constant cross-section of the conductor;
L is the length of the conductor. 4 Measuring process 4.1
Measuring method Measuring of the absolute value of the electrical conductivity takes place usually by a current voltage measurement. However, this method is usually applied in laboratories only. If the electrical conductivity shall be determined in a component on site, primarily eddy current processes are applied. To measure the electrical conductivity of non-magnetic metals, such as aluminium, copper, brass, titanium, chrome-nickel-steel, etc. Therefore, the phase-sensitive eddy current measurement procedure is very suitable. By that, the measuring probe fed from a generator with alternating current of a certain frequency is to be put to the object to be measured or to be brought into small distance to its surface. This exciter current generates a magnetic field of high frequency, which induces eddy currents in the material to be tested (in this case the coating respectively the base material), their intensity and penetration depth depend on its electrical conductivity. On the other hand the magnetic field induced by eddy currents overlaps the generating field. The generated resulting magnetic field is detected by a measuring coil. By that, the induced voltage is a function of the electrical conductivity of the object to be measured and can be used as a signal for its measuring. See Figure 1. SIST EN 16813:2017

Key 1 ferrite core of the probe 4 measuring signal 2 exiting current 5 eddy current induced 3 high frequency magnetic alternating field 6 electrically conductive non-ferrous-alloy Figure 1 — Phase-sensitive eddy current measuring method Using the phase-sensitive eddy current measurement procedure the phase changing between exciter current and measuring signal is to be transferred into a conductivity value. This measuring value is independent from the distance between the probe and the coating surface for a certain arrangement, which depends on the type of the probe. By that, a non-contactable determination of the conductivity can be applied also using this method, for example, below a varnish or a synthetic material coat. Using an adequate measuring frequency the influence of the surface roughness remains low. 4.2
Calibration standard Using the phase-sensitive eddy current measurement procedure the measuring value found in the component will be compared to the calibration standard as a reference standard, which conductivity is very well known. Standards for calibration of the measuring instrument are available for the whole conductivity range. Usually, they are also supplied from the measuring instrument producer. Because the calibration standards are subject to changes in properties due to use they have to be recalibrated at regular time periods or to be replaced. SIST EN 16813:2017

Measuring frequency and penetration depth The penetration depth of the eddy current is defined by the conductivity
and the measuring frequency f. Generally, the penetration depth 0 of the eddy current in a non-ferrous-alloy is given by:
××0R503 =f (3) where
0 is the penetration depth of the eddy current i
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