1、BRITISH STANDARD BS EN ISO 4518:1995 Incorporating Amendment No. 1 Metallic coatings Measurement of coating thickness Profilometric method The European Standard EN ISO 4518:1994 has the status of a British StandardBSENISO4518:1995 This British Standard, having been prepared under the directionof Sur
2、face Coatings (other than Paints) Standards Committee, was published underthe authority of the Executive Board and comes intoeffect on 31 December 1980 BSI 03-2000 The following BSI references relate to the work on this standard: Committee reference SRC/14 Draft for comment 78/51930 DC ISBN 0 580 11
3、796 0 Cooperating organizations The Surface Coatings (other than Paints) Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following: Aluminium Federation* Assay Offices Committee of Great Britain Association of Metal Sprayers* Bnf Me
4、tals Technology Centre* British Jewellers Association* British Jewellery and Giftware Federation Ltd. British Metal Finishing Suppliers Association* British Steel Industry Chemical Industries Association Electricity Supply Industry in England and Wales Engineering Equipment Users Association Galvani
5、zers Association Greater London Council Institute of Metal Finishing* Institute of Sheet Metal Engineering Institute of Vitreous Enamellers Institution of Corrosion Science and Technology* Metal Finishing Association* Ministry of Defence Motor Cycle Association of Great Britain Society of Motor Manu
6、facturers and Traders Limited* Vitreous Enamel Development Council Zinc Development Association The organizations marked with an asterisk in the above list, together with the following, were directly represented on the Technical Committee entrusted with the preparation of this British Standard: Asso
7、ciation of Manufacturers of Domestic Electrical Appliances British Anodising Association British Industrial Fasteners Federation City of London Polytechnic Department of Industry, National Physical Laboratory NDT Trade Association Coopted experts Amendments issued since publication Amd. No. Date of
8、issue Comments 8483 July 1995 Indicated by a sideline in the marginBSENISO4518:1995 BSI 03-2000 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword 2 1 Scope and field of application 3 2 References 3 3 Principle 3 4 Instrumentation: Operational parameters and m
9、easurement characteristics 3 5 Factors relating to accuracy 4 6 Calibration 5 7 Measuring procedure 5 Table Force on stylus 3 Publications referred to Inside back coverBSENISO4518:1995 ii BSI 03-2000 National foreword This Part of BS 5411 has been prepared under the direction of the Surface Coatings
10、 (other than Paints) Standards Committee. It is identical with ISO 4518 “Metallic coatings Measurement of coating thicknessProfilometric method”, prepared with the active participation and approval of the United Kingdom by Sub-committee 2, Methods of inspection and coordination of test methods, of T
11、echnical Committee107, Metallic and other non-organic coatings, of the International Organization for Standardization (ISO). In 1994 the European Committee for Standardization (CEN) accepted ISO4518:1990 as European Standard EN ISO 4518:1994. As a consequence of implementing the European Standard th
12、is British Standard is renumbered as BSEN ISO 4518:1995 and any reference to BS 5411-7 should be read as a reference to BS EN ISO 4518:1995. Terminology and conventions. The text of the International Standard has been approved as suitable for publication, without deviation, as a British Standard. So
13、me terminology and certain conventions are not identical with those used in British Standards; attention is especially drawn to the following. The comma has been used throughout as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker
14、. Wherever the words “International Standard” appear, referring to this standard, they should be read as “British Standard”. The Technical Committee has reviewed the provisions of ISO 2177:1972 and has agreed that they are acceptable for use in conjunction with this standard. A British Standard rela
15、ted to ISO 2177:1972 is BS 5411-4:1977 “Coulometric method for the measurement of coating thickness”, but this is expected to be revised shortly as a dual-numbered standard identical with a revision of ISO2177. A British Standard does not purport to include all the necessary provisions of a contract
16、. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International Standard Corresponding British Standard ISO 2064:1980 BS 5411 Methods of test for metallic and rela
17、ted coatings Part 1:1981 Definitions and conventions concerning the measurement of thickness (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN ISO title page, pages 2 to 6, an inside back cover and a back cover. This standard has been up
18、dated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 4518 January 1995 ICS 25.220.40 Descriptors: Metal coatings, dimensional measurements, thickness, meas
19、uring instruments, profile meters English version Metallic coatings Measurement of coating thickness Profilometric method (ISO 4518:1990) Revtements mtalliques Mesurage profilomtrique (ISO 4518:1990) Metallische berzge Messen der Schichtdicke Profilometrisches Verfahren (ISO 4518:1990) This European
20、 Standard was approved by CEN on 1994-10-03. 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
21、 such national standards may be obtained on application to the Central Secretariat 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 langu
22、age and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and U
23、nited Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1995 Copyright reserved to all CEN members Ref. No. EN ISO 4518:1995 EENISO4518:1995 2 BSI 03-2000 Foreword This European S
24、tandard has been taken over by the Technical Committee CEN/TC 262, Protection of metallic materials against corrosion, from the work of ISO/TC 107, Metallic and other inorganic coatings, of the International Organization for Standardization (ISO). This document was submitted to formal vote and was a
25、dopted by CEN as a European Standard. 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 July 1995, and conflicting national standards shall be withdrawn at the latest by July 1995. In accordance wit
26、h the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.ENISO4518:1995
27、 BSI 03-2000 3 1 Scope and field of application 1.1 This International Standard specifies a method for the measurement of metal coating thickness by first forming a step between the surface of the coating and the surface of its substrate and then measuring the step height using a profile recording i
28、nstrument. It covers the instrumentation characteristics and the procedure appropriate to this specific application of profilometric methods. 1.2 The method is applicable to the measurement of thicknesses of metal coatings from 0,01 4m to 1 000 4m on flat surfaces and, if appropriate precautions are
29、 taken, on cylindrical surfaces. It is highly suitable for the measurement of minute thicknesses but, for thicknesses of less than 0,01 4m, surface flatness and surface smoothness are very critical and accordingly, the method is not recommended for use down to the lowest level of measurement usual f
30、or electronic stylus instruments. The method is suitable for measuring coating thicknesses when preparing coating thickness reference standards. 2 References ISO 2064, Metallic and other non-organic coatings Definitions and conventions concerning the measurement of thickness. ISO 2177, Metallic coat
31、ings Measurement of coating thickness Coulometric method by anodic dissolution. 3 Principle Formation of a step either by dissolving part of the coating (acceptance testing) or by masking a portion of the substrate prior to coating (production inspection). Measurement of the height of the step using
32、 a profile recording instrument. 4 Instrumentation: Operational parameters and measurement characteristics 4.1 Types of profile recording instruments Either of two types may be used: a) electronic stylus instruments, known as surface analysers and surface profile recorders, generally used to measure
33、 surface roughness but which, for the purposes of this International Standard, are used to record the profile of a step; b) electronic inductive comparators equipped with styli and capable of recording the profile of a step. Electronic stylus instruments may have a greater utility, being suitable fo
34、r roughness measurements, while electronic inductive comparators may be simpler in construction. The two types of instrument generally cover different ranges of coating thickness: 0,005 to 250 4m for electronic stylus instruments, and 1 to 1 000 4m for electronic inductive comparators. 4.2 Electroni
35、c stylus instruments 4.2.1 These instruments are used to record the profile of a surface and have the following components. 4.2.1.1 A pick-up with a conical or pyramidal stylus having an included angle of1,57 rad (90 ) and a nominal tip radius, in the direction of the traverse, of 2, 5, 10 or 50 4m.
36、 The force of contact on the test surface shall not exceed the appropriate value given in the table. Table Force on stylus 4.2.1.2 A traverse unit that moves the pick-up relative to a datum skid or, in those cases where the skid may result in damage to the surface or introduce distortion of the step
37、 to be measured, a datum surface having nominal form of the profile. 4.2.1.3 An amplifying unit giving nominal values of the vertical (V v ) magnifications of the profile selected from the following series: 100 200 500 1 000 2 000 5 000 10 000 20 000 50 000 100 000 200 000 500 000 1000 000. 4.2.1.4
38、A recording instrument that plots the amplified variations of the profile which, when operated in conjunction with the traverse unit, permits nominal values of the horizontal (V h ) magnifications of the profile selected from the following series: 10 20 50 100 200 500 1 000 2 000 5 000. 4.2.2 Profil
39、e recording instruments will furnish the following measuring characteristics: traverse length:1 to 100mm range of thickness measurement: 0,005 to 250 4m resolution (dependent on the range of measurement): 0,000 5 to 1 4m. Nominal value of stylus tip radius, 4m 2 5 10 50 b Maximum static force at the
40、 mean level of the stylus, mN a 0,7 4 16 10 b a 1 mN . 0,1 gf b Values useful for low-hardness metals such as tin and lead.ENISO4518:1995 4 BSI 03-2000 4.3 Electronic inductive comparators 4.3.1 The design of electronic inductive comparators is much like that of the electronic stylus instruments (4.
41、2), the principal difference being that the large-radius stylus does not plot the microprofile of the surface. 4.3.2 Typical examples of the measuring characteristics and the operational parameters of a comparator instrument are as follows: An electronic inductive comparator with a linearity of not
42、less than0,5%, a table providing a rectilinear motion to the surface to be traversed, and suitable amplifiers, and using the following operational parameters: radius of stylus: 250 4m maximum magnification: X 50 000 static stylus force: 0,12 N will furnish the following measurement characteristics:
43、traverse length: 100 mm range of thickness measurement: 1 to 1 000 4m resolution (dependent on the range of measurement): 0,02 to 20 4m. 5 Factors relating to accuracy 5.1 Profile record Because the thickness measurement is made from the recorded profile, errors will arise if the recording does not
44、give a faithful reproduction of the step at a suitable magnification. Inaccurate recordings may reflect the quality or improper adjustment of the recording instrument. 5.2 Vertical magnification If the vertical magnification is too low, measurement precision will be poor. It should be set to take ma
45、ximum advantage of the chart width. 5.3 Graphical measurements If the test surface is not parallel to the reference (datum) surface, the recording of the horizontal surface is sloped with respect to the chart grid; the vertical portion of the step is also sloped but it may still be vertical on the c
46、hart grid, depending on the vertical and horizontal magnifications, on the radius of the stylus and finally on the height of the step (i.e. thickness). When the profile is sloped, a common error is to measure the perpendicular distance between the mean lines of the profile without correcting for the
47、 differences between the horizontal and vertical magnifications. To avoid these errors or additional mathematical calculations, the datum and test surfaces shall be parallel. This may be accomplished by the use of an appropriate jig or fitting. 5.4 Applied force If the force on the stylus is too gre
48、at, the stylus produces a scratch or deformation which may introduce a measurement error. The force should be kept to a minimum and generally should not exceed the appropriate values given in the Table in4.2.1.1. 5.5 Stylus diameter and surface roughness If a small-diameter stylus is used on a rough
49、 surface, the step height may be difficult to measure accurately because of poor definition of the extremes of the recorded step. A large-diameter stylus minimizes this difficulty. If the substrate and coating surfaces are of different roughnesses, the recorded step profile may be misleading to the extent that the stylus rides the high spots more on one surface than the other because of different peak to peak spacings. A small-diameter stylus tends to reduce this error. A small-diam
