1、 CEN EN*IS0*45LB 95 3404569 0099350 i66 Bs BS5411 : Part7 : 1981 Contents Page National foreword Inside front cover 3. Principle Cooperating organizations Back cover 4. instrumentation: Operational parameters Methods 5. Factors relating to accuracy 1: Scope and field of application 1 6. Calibration
2、2. References 1 7. Measuring procedure and measurement characteristics National foreword This Part of BS 541 1 has been prepared under the direction of the Surface Coatings (other than Paints) Standards Committee. It is identical with IS0 4518 Metallic coatings -Measurement of coating thickness-Prof
3、ilometric 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 Technical Committee 107, Metallic and other non-organic coatings, of the International Organization for Standardization (ISO). 4
4、In iW the European Committee for Standardi attention is especially drawn to the f o I low i ng. 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. Wherever the words International Standard app
5、ear, . . Page 1 referring to this standard, they should be read as British Standard. Cross-references International standard Corresponding British Standard IS0 2064- 1980 BS 541 1 Methods of test for metallic and related coatings Part 1 : 1981 Definitions and conventions concerning the measurement o
6、f thickness (Identical) The Technical Committee has reviewed the provisions of IS0 21 77-1 972 and has agreed that they are acceptable for use in conjunction with this standard. A British Standard related to IS0 2177-1972 is BS 5411 : Part 4 : 1977 Coulometric method for the measurement of coating t
7、hickness, but this is expected to be revised shortly as a dual-numbered standard identical with a revision of IS0 21 77. *. - CEN EN*ISO*4518 95 .I 3404589 0099353 bT2 NOEWIE: EUROPENNE EUROPmCHE NORM ._ EN IS0 4518 January 1995 Descriptors Metal coatink. diniensionai nieasiirenientc. thickness, ine
8、asuring instrunients, profile nieters English version Metallic coatings - Measurement of coating thickness - Profilometrie method (IS0 4518 : 1990) Revtements rntalliques - Mesurage profilorntrique Schichtdicke - Profilonietrisches Verfahren (IS0 4518 : 1990) Metallische berzge - Messen der (IS0 451
9、8 : 1990) This European Standard was approved by CEN on 1994-10-03. CEN members are bound to coiiiply with the CENICENELEC 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 bibliographi
10、cal references concerning 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, Gernian). A version in any other language made by translation under the responsibility of a CEN
11、 nieiiiber into its own language and notified to the Cent,ral Secretariat has the saine status as the official versions. CEN nienibers are the national standards bodies of Austria, Belgiuni, Denniark, Finland. Rance, Gerniany, Greece, Iceland, Ireland, Italy, Luxenibourg, Netherlands, Norway, Portug
12、al, Spain, Sweden, Switzerland and United Kingdom. CEN European Conimittee for Standardization Coinit Europen de Nornialisatiori Europaisches Koiriike fiii- Norniung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1995 Copyright resemed to all CEN nietribers Ref. No. EN IS0 4518 : 1995 E
13、Page 2 EN IS0 4518 : 1995 Foreword This European Standard has been taken over by the Technical Committee CENITC 262, Protection of metallic materials against corrosion, from the work of ISOITC 107, Metallic and other inorganic coatings, of the International Organization for Standardization (ISO). Th
14、is document was submitted to formal vote and was adopted by CEN as a European Standard. This European Standard shall be given the statuc 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 withd
15、rawn at the latest by July 1995. In accordance with the CENKENELEC Intenial Regulations, the following countries are bound to implement this European Standard Austria, Eklgiuni, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Swed
16、en, Switzerland and United Kingdom. CEN EN*ISO*4518 95 rn 3404589 0099353 475 i$ BS 5411 : Part 7 : 1981 Maximum static force at the mem hvd of the stylus, rnN British Standard Methods of test for Metallic and related coatings Part 7. Profilometric method for measurement of coating thickness 0.7 4 1
17、6 10“ 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 instrument
18、. It covers the instrumentation characteristics and the procedure appropriate to this specific application of profilometric methods. J 1.2 The method is applicable to the measurement of thicknesses of metal coatings from 0,Ol pm to 1 o00 pm on flat surfaces and, if appropriate precautions are taken,
19、 on cylin- drical surfaces. It is highly suitable for the measurement of minute thicknesses but, for thicknesses of less than 0,Ol pm, 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 for el
20、ectronic stylus in- struments. The method is suitable for measuring coating thicknesses when preparing coating thickness reference stan- dards. 2 References IS0 2064, Metallic and other non-organic coatings - Defini- tions and conventions concerning the measurement of thickness. IS0 2177, Metallic c
21、oetings - Measurement of coating thickness - Coulometric method by anodic dissolution. 3 Principle Formation of a step either by dissolving part of the coating (ac- ceptance testing) or by masking a portion of the substrate prior to coating (production inspection). Measurement of the height of the s
22、tep using 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 : 1 a) electronic stylus instruments, known as surface analysers and surface profile recorders, generally us
23、ed to k/“ measure surface roughness but which, for the purposes of this International Standard, are used to record the profile of a step; b) and capable of recording the profile of a step. electronic inductive comparators equipped with styli Electronic stylus instruments may have a greater utility,
24、being tive comparators may be simpler in construction. The two types of instrument generally cover different ranges of coating thickness : 0,005 to 250 pm for electronic stylus instruments, and 1 to 1 O00 pm for electronic inductive comparators. 2: :.: suitable for roughness measurements, while elec
25、tronic induc- ,. 4.2 Electronic stylus instruments 4.2.1 These instruments are used to record the profile of a surface and have the following components. rn 4.2.1.1 A pick-up with a conical or pyramidal stylus having an included angle of 1,57 rad (Wo) and a nominal tip radius, in the direction of th
26、e traverse, of 2,5, 10 or 50 pm. The force of con- tact on the test surface shall not exceed the appropriate value given in the taMe. Table - Force on stylus I 2 1 5 1 10 150“ 1 Nomid vdw of stylus tip radius. pin I 4.2.1.2 A traverse unit that moves the pick-up relative to a datum skid or, in those
27、 cases where the skid may result in damage to thesurface or introduce distortion of the step to be measured, a datum surface having nominal form of the profile. 4.2.1.3 An amplifying unit giving nominal values of the ver- tical VJ magnifications of the profile selected from the follow- ing series :
28、100 - 200 - 500 - 1 o00 - 2000 - 5000 - loo00 - zoo00 - 5oOOo - 1ooo00 - 200000 - 5ooOoo - 1 000Ooo. 1 i * CEN EN*ISO*Y518 95 W 3404589 0099354 301 m BS 541 1 : Part 7 : 1981 4.2.1.4 A recording instrument that plots the amplified varia- tions of the profile which, when operated in conjunction with
29、the traverse unit, permits nominal values of the horizontal Vhi magnifications of the profile selected from the following series : 10-20-50-100-200-500-1o0O-2o0O- 5 OOO. 4.2.2 Profile recording instruments will furnish the following measuring characteristics : - traverse length : 1 to 100 mm - range
30、 of thickness measurement : 0,005 to 250 ptn - 0,OOO 5 to 1 pm. resolution (dependent on the range of measurement) : 4.3 Electronic inductive comparators 4.3.1 The design of electronic inductive comparators is much like that of the electronic stylus instruments (4.2), the principal difference being
31、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 less than 0,5 %, a table providing
32、 a rectilinear motion to the surface to be traversed, and suitable amplifiers, and using the following operational parameters : - radius of stylus : 250 pm - maximum magnification : X 50 o00 - static stylus force : 0,12 N will furnish the following measurement characteristics : - traverse length : 1
33、00 mm - range of thickness measurement : 1 to 1 O00 pm - 0,02 to 20 prn. resolution (dependent on the range of measurement) : 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 give a fait
34、hful 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 maximum advan
35、tage of the chart width. 5.3 Graphical measurements If the test surface is not parallel to the reference (datum) sur- face, 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 chart grid
36、, depending on the vertical and horizontal magnifications, on the radius of the syius and finally on the height of the step (.e. thickfiess). 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 differenc
37、es 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 ac- complished by the use of an appropriate jig or fitting. 5.4 Applied force If the force on the stylus is too great, the
38、stylus produces a scratch or deformation which may introduce a measurement er- ror. The force should be kept to a minimum and generally should not exceed the appropriate values given in the table in 4.2.1.1. 5.5 Stylus diameter and surface roughness ! If a small-diameter stylus is used on a rough su
39、rface, 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 ex
40、tent that the stylus rides the high spots more on one sur- face than the other because of different peak to peak spacings. A small-diameter stylus tends to reduce this error. A small-diameter stylus equipped with an electronic filter to smooth out the profile can be advantageous, but may round the c
41、orners of the step profile. In principle, the roughness of a recorded substrate (peak to valley height of the surface profile) should not exceed 10 % of the step height. 5.6 Vibrations Vibrations may cause irregularities or noise in the recorded pro- file, making accurate measurement difficult. This
42、 effect should be minimized by insulating the equipment from vibrations. In principle, the peak to valley height should not exceed 10 % of the step height. 5.7 Surface curvature Surface curvature can interfere with accurate measurement of - ?, t ?“ CEN EN*IS0*452Telex 23218). Contract requirements A
43、ttention is drawn to the fact that this British Standard does not purport to include ail the necessary provisions of a contract. Revision of British Standards British Standards are revised, when necessary, by the issue either of amendment slips or of revised editions. It is important that users of B
44、ritish Standards should ascertain that they are in poueaion of the latest amendments or editions. Information on all BSI publications is in the 6s Yearbook, supplemented each month by B.SI News which is available to subscribing members of the Institution and gives details of new publications, revisi
45、ons, amendments and withdrawn standards. The following BSI references relate to the work on this standard: Committee reference SRC114 Draft for comment 78/51930 DC Cooperating organizations The Surface Coatings (other than Paints) Standards Committee, under whose direction this British Standard was
46、prepared, consists of representatives from the following: Aluminium Federation Association of Metal Sprayers Bnf Metals Technology Centre British Jewellers Association British Metal Finishing Suppliers Association Assay Offices Committee of Great Britain British Jewellery and Giftware Federation Ltd
47、. British Steel Industry Chemical Industries Association Electricity Supply Industry in England and Wales Engineering Equipment Users Association Galvanizers Association Greater London Council Institute of Sheet Metal Engineering Institute of Vitreous Enamellers Institute of Metal Finishing *Institu
48、tion of Corrosion Science and Technology *Metal Finishing Association Ministry of Defence Motor Cycle Association of Great Britain Vitreous Enamel Development Council Zinc Development Association Society of Motor Manufacturers and Traders Limited The organizations marked with an asterisk in the abov
49、e list, together with the following, were directly represented on the Technical Committee entrusted with the preparation of this British Standard: Association of Manufacturers of Domestic Electrical Appliances British Anodising Association British Industrial Fasteners Federation City of London Polytechnic Department of 1 ndustry, National Physical Laboratory NDT Trade Association Coopted experts v cri P A A a P cri A 00 A I I British Standards Institution - 2 Park Street
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