BS EN ISO 2360:2017
$167.15
Non-conductive coatings on non-magnetic electrically conductive base metals. Measurement of coating thickness. Amplitude-sensitive eddy-current method
| Published By | Publication Date | Number of Pages |
| BSI | 2017 | 42 |
This document specifies a method for non-destructive measurements of the thickness of non-conductive coatings on non-magnetic electrically conductive base metals, using amplitude-sensitive eddy-current instruments.
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 most oxide coatings produced by anodizing, but is not applicable to all conversion coatings, some of which are too thin to be measured by this method (see Clause 6).
This method can also be used to measure non-magnetic metallic coatings on non-conductive base materials. However, the phase-sensitive eddy-current method specified in ISO 21968 is particularly usable to this application and can provide thickness results with a higher accuracy (see Annex A).
This method is not applicable to measure non-magnetic metallic coatings on conductive base metals. The phase-sensitive eddy-current method specified in ISO 21968 is particularly useful for this application. However, in the special case of very thin coatings with a very small conductivity, the amplitude-sensitive eddy-current method can also be used for this application (see Annex A).
Although the method can be used for measurements of the thickness of coatings on magnetic base metals, its use for this application is not recommended. In such cases, the magnetic method specified in ISO 2178 can be used. Only in case of very thick coatings above approximately 1 mm, the amplitude-sensitive eddy-current method can also be used for this application (see Annex A).
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 4 | European foreword Endorsement notice |
| 6 | Foreword |
| 7 | 1 Scope 2 Normative references 3 Terms and definitions |
| 8 | 4 Principle of measurement |
| 9 | 5 Factors affecting measurement uncertainty 5.1 Basic influence of the coating thickness 5.2 Electrical properties of the base metal |
| 10 | 5.3 Geometry: Base metal thickness 5.4 Geometry: Edge effects 5.5 Geometry: Surface curvature 5.6 Surface roughness |
| 11 | 5.7 Cleanliness: Lift-off effect 5.8 Probe pressure 5.9 Probe tilt 5.10 Temperature effects |
| 12 | 5.11 Intermediate coatings 5.12 External electromagnetic fields 6 Calibration and adjustment of the instrument 6.1 General 6.2 Thickness reference standards |
| 13 | 6.3 Methods of adjustment |
| 14 | 7 Measurement procedure and evaluation 7.1 General 7.2 Number of measurements and evaluation 8 Uncertainty of the results 8.1 General remarks |
| 15 | 8.2 Uncertainty of the calibration of the instrument |
| 16 | 8.3 Stochastic errors 8.4 Uncertainties caused by factors summarized in Clause 5 |
| 17 | 8.5 Combined uncertainty, expanded uncertainty and final result 9 Precision 9.1 General 9.2 Repeatability (r) |
| 18 | 9.3 Reproducibility limit (R) 10 Test report |
| 20 | Annex A (informative) Eddy-current generation in a metallic conductor |
| 24 | 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 |
| 26 | Annex C (informative) Basic performance requirements for coating thickness gauges which are based on the amplitude-sensitive eddy-current method described in this document |
| 28 | Annex D (informative) Examples for the experimental estimation of factors affecting the measurement accuracy |
| 33 | Annex E (informative) Table of the student factor |
| 34 | Annex F (informative) Example of uncertainty estimation (see Clause 8) |
| 36 | Annex G (informative) Details on precision |
| 40 | Bibliography |
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