1、DEUTSCHE NORM January 1995 DIN Hot dip galvanized coatings on ferrous materials Gravimetric determination of the mass per unit area (IS0 1460 : 1992) English version of DIN EN IS0 1460 EN IS0 1460 This standard incorporates the Englishversion of I so 1 460. Supersedes DIN 50988-1, February 1984 edit
2、ion. ICs 25.220.40 Descriptors: Metal coatings, ferrous materials, hot dip galvanizing, gravimetry, testing. Metallische berzge; Feuerverzinken auf Eisenwerkstoffen; gravimetrisches Verfahren zur Bestimmung der flchenbezogenen Masse (IS0 1460: 1992) European Standard EN IS0 1460: 1994 has the status
3、 of a DIN Standard. A comma is used as the decimal marker. National foreword This standard has been published in accordance with a decision taken by CENAC 262 to adopt, without alteration, International Standard IS0 1460 as a European Standard. The responsible German body involved in its preparation
4、 was Technical Committee Schmelztauchberzge of the NormenausschuB Materialprfung (Materials Testing Standards Committee). Amendments DIN 50988-1, February 1984 edition, has been superseded by the specifications of EN IS0 1460, which is identical to IS0 1460. Previous editions DIN 50952: 1963-12; DIN
5、 50954: 1965-02; DIN 50988-1: 1984-02. International Patent Classification G O1 N 033/20 EN comprises 4 pages. DIN EN IS0 1460 Enol. Price cIrouD Beuth Verlag GmbH, Berlin, has the exclusive right of sale for German Standards (DIN-Normen). 08.95 - -. Sales NO. i 105 EUROPEAN STANDARD EUROPISCHE NORM
6、 NORME EUROPENNE EN IS0 1460 October 1994 ICs 25.220.40 Descriptors: Metal coatings, ferrous materials, hot dip galvanizing, gravimetry, testing. English version Metallic coatings Gravimetric determination of the mass per unit area (IS0 1460: 1992) Hot dip galvanized coatings on ferrous materials Re
7、vtements mtalliques; revtements de galvanisation chaud sur mtaux ferreux; dtermination gravimtrique de la masse par unit de surface (IS0 1460:1992) Metallische berzge; Feuerverzinken auf Eisenwerkstoffen; gravimetrisches Verfahren zur Bestimmung der flchen- bezogenen Masse (IS0 1460: 1992) This Euro
8、pean Standard was approved by CEN on 1994-10-26 and is identical to the IS0 Standard as referred to. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipu- late the conditions for giving this European Standard the status of a national standard without any alteration. U
9、p-to-date lists and bibliographical 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, German). A version in any other language made by translation un
10、der the responsibility of a CEN member into its own language 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, Nether
11、lands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1994. Copyright reserved to all CEN members. Ref. No. EN IS0 146
12、0:1994 E Page 2 EN IS0 1460:1994 Foreword International Standard IS0 1460: 1992 Metallic coatings; hot dip galvanized coatings on ferrous materials; gravimetric determination of the mass per unit area, which was prepared by ISOTTC 107 Metallic and other inorganic coatings of the International Organi
13、zation for Standardi- zation, has been adopted by Technical Committee CEN/TC 262 Protection of metallic materials against corrosion as a European Standard. CEN/TC 262 decided to submit IS0 1460: 1992 for Formal Vote. The result was positive. This European Standard shall be given the status of a nati
14、onal standard either by publication of an identical text or by endorsement, and conflicting national standards withdrawn, by April 1995 at the latest. In accordance with the CENKENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denm
15、ark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of the International Standard IS0 1460:1992 was approved by CEN as a European Standard without any modifica- tion. Pag
16、e 3 EN IS0 1460 : 1994 1 Scope This International Standard specifies a method of de- termining the mass per unit area of hot dip galvanized coatings on ferrous materials. Since as exact knowledge of the area of the surface is essential, this International Standard Is mainly ap- plicable to shapes wh
17、ose areas are easy to determine. If, with heavy samples, the specifications of clause 5 cannot be met, then the hot dip galvanized coating mass has to be determined by another method. 2 Principle The hot dip galvanized coating on a surface of known area is dissolved in inhibited acid and the resulta
18、nt loss in mass is determined by weighing the sample before and after the coating is dissolved. 3 Stripping solution Dissolve 3,5 g of hexamethylenetetramine in 500 ml of concentrated hydrochloric acid (p = 1,19 s/ml). Di- lute this solution to 1 O00 ml with distilled water. 4 Sampling The method of
19、 sampling shall be agreed between the interested parties. 5 Procedure Where necessary, the sample shall be degreased with an organic solvent that does not attack the hot dip galvanized coating, and then dried. Before stripping, the sample shall be weighed to an accuracy better than 1 % of the presum
20、ed coating mass. The quantity of solution shall be measured so that at least 10 ml of solution are available for each square centimetre of the surface of the sample. The sample shall be completely immersed in the solution at room temperature and left until the coating has completely dissolved. The e
21、nd of the dissolution process can be recognized by the cessation of the originally brisk evolution of hydrogen. The sample shall then be rinsed in running water and, if necessary, brushed to remove any loose substance which may be adhering to the surface, dipped in alcohol, quickly dried and again w
22、eighed to the accuracy indicated in the previ- ous paragraph. After weighing, the surface area A of the exposed surface shall be determined to an accuracy of 1 %. 6 Expression of results 6.1 Method of calculation Calculate the mass per unit area pA, of the hot dip galvanized coating, expressed in gr
23、ams per square metre, from the equation PA = 7 q-m, x lo6 where q m;! A is the mass, in grams, of the sample be- fore stripping; is the mass, in grams, of the sample after stripping; is the area, in square millimetres, of the exposed surface of the sample. Page 4 EN IS0 1460 : 1994 NOTE 1 With steel
24、 wire, it is often advantageous to cal- culate the mass per unit area, p, of a hot dip galvanized coating. expressed in grams per square metre, using the equation ml -9 XDX- 7,84 x lo3 4 “t2 PA where D is the diameter, in millimetres, of the wire after stripping, and the density of steel is taken as
25、 7,4 g/cm3. In this way, it is not necessary to know the length of the wire. 6.2 Reproducibility The reproducibility (different observers, different ap- paratus and operating conditions) is about f 5 % of the mean value. 7 Testreport The test report shall contain the following information: a) a refe
26、rence to this International Standard; b) type and dimensions of the sample; c) the method of calculating the surface area for shaped samples; d) the mass per unit area of coating, in grams per square metre or, if agreed between the interested parties, the thickness of the coating, in micro- metres). 1) The approximate thickness, d, of the hot dip galvanized coating, in micrometres, can be calculated from the equation d=- PA 72 which assumes that the density of the coating is 7,2 &m3.
