EN ISO 2178:1995
(Main)Non-magnetic coatings on magnetic substrates - Measurement of coating thickness - Magnetic method (ISO 2178:1982)
Non-magnetic coatings on magnetic substrates - Measurement of coating thickness - Magnetic method (ISO 2178:1982)
This second edition cancels and replaces the first edition (i. e. ISO 2178:1972). Specifies the method of using coating thickness instruments of the magnetic type for non-destructive measurements of the thickness. The method is applicable only for measurements on reasonably flat specimens. For non-magnetic substrates: see ISO 2361.
Nichtmagnetische Überzüge auf magnetischen Grundmetallen - Messen der Schichtdicke - Magnetverfahren (ISO 2178:1982)
In die vorliegende Internationale Norm ist ein Verfahren für die Anwendung magnetischer Geräte zur zerstörungsfreien Dickenmessung nichtmagnetischer Überzüge (einschließlich Emailüberzüge) auf magnetischen Grundmetallen festgelegt. Das Verfahren ist nur für Messungen auf relativ ebenen Proben anwendbar. Das bevorzugte Verfahren für Nickelüberzüge auf nichtmagnetischen Grundmetallen ist in ISO 2361 festgelegt.
Revêtements métalliques non magnétiques sur métal de base magnétique - Mesurage de l'épaisseur du revêtement - Méthode magnétique (ISO 2178:1982)
La présente Norme internationale spécifie la méthode d'utilisation des appareils de mesure d'épaisseur des revêtements du type magnétique pour le mesurage non destructif de l'épaisseur de revêtements non magnétiques (y compris les émaux vitrifiés et sur porcelaine) sur un métal de base magnétique. La méthode n'est applicable que pour des mesurages sur des éprouvettes relativement planes. Dans le cas de revêtements de nickel sur métal de base non magnétique, il est préférable d'utiliser la méthode spécifiée dans l'ISO 2361.
Nemagnetne prevleke na magnetnih osnovah – Merjenje debeline prevleke – Magnetna metoda (ISO 2178:1982)
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Standards Content (Sample)
SLOVENSKI STANDARD
01-junij-1999
Nemagnetne prevleke na magnetnih osnovah – Merjenje debeline prevleke –
Magnetna metoda (ISO 2178:1982)
Non-magnetic coatings on magnetic substrates - Measurement of coating thickness -
Magnetic method (ISO 2178:1982)
Nichtmagnetische Überzüge auf magnetischen Grundmetallen - Messen der
Schichtdicke - Magnetverfahren (ISO 2178:1982)
Revetements métalliques non magnétiques sur métal de base magnétique - Mesurage
de l'épaisseur du revetement - Méthode magnétique (ISO 2178:1982)
Ta slovenski standard je istoveten z: EN ISO 2178:1995
ICS:
17.040.20 Lastnosti površin Properties of surfaces
25.220.40 Kovinske prevleke Metallic coatings
25.220.50 Emajlne prevleke Enamels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
International Standard
INTERNATIONAL ORGANIZATION FOR STANDARDlZATIONWdEmLLYHAPO~HAR OPrAHM3AlJWR fl0 CTAHL\APTM3A~Hbl.ORGANlSATlON INTERNATIONALE DE NORMALISATION
Non-magnetic coatings on magnetic substrates -
Measurement of coating thickness - Magnetic method
Revgtements m6talliques non magnktiques SW m&al de base magnktique
- Mesurage de l%!paisseur du rev@tement - M&hode
rnagnktique
Second edition - 1982-08-01
UDC 669.068 : 531.717 : 621.317.49
Ref. No. IS0 2178-1982 (E)
Descriptors : metal coatings, non-metallic coatings, vitreous enamels, porcelain enamels, dimensional measurement, magnetic tests, base metal.
Price based on 4 pages
’ Foreword
IS0 (the International Organization for Standardization) is a worldwide federation of
national standards institutes (IS0 member bodies). The work of developing Inter-
national Standards is carried out through IS0 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 liaison 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 IS0 Council.
International Standard IS0 2178 was developed by Technical Committee ISO/TC 107,
Metallic and other non-organic coatings, and was circulated to the member bodies in
November 1980.
It has been approved by the member bodies of the following countries :
Australia Italy Sweden
Bulgaria Japan Switzerland
Czechoslovakia Netherlands
United Kingdom
France Poland USA
Germany, F. R. Romania USSR
Hungary South Africa, Rep. of
India Spain
No member body expressed disapproval of the document.
This second edition cancels and replaces the first edition (i.e. IS0 2178-1972).
0 International Organization for Standardization, 1982 0
Printed in Switzerland
IS0 2178-1982 (E)
INTERNATIONAL STANDARD
Non-magnetic coatings on magnetic substrates -
Measurement of coating thickness - Magnetic method
1 Scope and field gf application Magnetic properties of the basis metal
4.2
This International Standard specifies the method of using
Thickness measurements by the magnetic method are affected
coating thickness instruments of the magnetic type for non- by variations in the magnetic properties of the basis metal. For
destructive measurements of the thickness of non-magnetic practical purposes, magnetic variations in low carbon steels
coatings (including vitreous and porcelain enamel coatings) on can be considered to be insignificant. To avoid the influences
magnetic basis metals. of several, or localized, heat treatments and cold working, the
instrument should be calibrated using a calibration standard
The method is applicable only for measurements on reasonably
having a basis metal with the same properties as that of the test
flat specimens. In the case of nickel coatings on non-magnetic specimen or, preferably, and if available, with a sample of the
substrates, the preferred method is that specified in IS0 2361.
part to be tested before application of the coating.
4.3 Basis metal thickness
2 References
For each instrument, there is a critical thickness of basis metal
IS0 2064, Metallic and other non-organic coatings - Defini-
above which measurements will not be affected by an increase
tions and conventions concerning the measurement of
in thickness. Since it depends on the instrument probe and the
thickness.
nature of the basis metal, its value should be determined ex-
perimentally, unless it is specified by the manufacturer.
IS0 2361, Electrodeposited nickel coatings on magnetic and
non-magnetic substrates - Measurement of coating thickness
- Magnetic method.
4.4 Edge effects
The method is sensitive to abrupt changes in surface contour of
3 Principle
the test specimen. Therefore, measurements made too near an
edge or inside corner will not be valid unless the instrument is
Coating thickness instruments of the magnetic type measure
specifically calibrated for such measurements. The effect may
either the magnetic attraction between a permanent magnet
extend up to about 20 mm from the discontinuity, depending
and the basis metal, as influenced by the presence of the
on the instrument.
coating, or the reluctance of a magnetic flux path passing
through the coating and the basis metal.
4.5 Curvature
4 Factors affecting the measuring
Measurements are affected by the curvature of the test
accuracyl)
specimen. The influence of curvature varies considerably with
the make and type of instrument, but always becomes more
The following factors may affect the accuracy of measure-
pronounced as the radius of curvature decreases.
ments of coating thickness.
Instruments with two-pole probes may also produce different
4.1 Coating thickness
readings if the poles are aligned in planes parallel or perpen-
dicular to the axis of a cylindrical surface. A similar effect can
The precision of a measurement changes with coating
occur with a single-pole probe if the tip is unevenly worn.
thickness depending on the instrument design. For thin
coatings, the precision is constant, independent of the
Measurements made on curved test specimens may not,
thickness. For thick coatings, the precision is an approximately therefore, be valid unless the instrument is specifically
constant fraction of the thickness.
calibrated for such measurements.
1) For the purpose of this International Standard, the measuring uncertainty is defined as that obtained with an instrument correctly calibrated and
used.
IS0 21784982 (E)
4.6 Surface roughness an instrument probe in a horizontal or upside-down position
may require a different calibration, or may be impossible.
If the range of a series of measurements, made within the same
reference area (see IS0 2064) on a rough surface, substantially
exceeds the inherent repeatability of the instrument, the
number of measurements required should be increased to at
5 Calibration of instruments
least five.
5.1 General
4.7 Direction of mechanical working of the basis
metal
Before use, each instrument shall be calibrated in accordance
with the manufacturer ’s instructions using suitable calibration
Measurements made by an instrument having a two-pole probe
standards or by comparing magnetic thickness measurements
or an unevenly worn single-pole probe may be influenced by
made on a selection of the test specimens with thickness
the direction in which the magnetic basis metal has been sub-
measurements made by the method specified in the Interna-
jected to mechanical working (such as rolling), the reading
tional Standard for the particular coating concerned. For in-
changing with the orientation of the probe on the surface.
struments which cannot be calibrated, the deviation from the
nominal value shall be determined by comparison with calibra-
tion standards and shall be taken into consideration for all
4.8 Residual magnetism
measurements.
Residual magnetism in the basis metal affects measurements
Duri
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