1、UDC 665.767: 621.22: 620.193: 620.22- DEUTSCH E NORM Auaust 19E Testing the compatibility of fire-resistant hydraulic fluids with metals DIN 51 345 Prfung von schwerentflammbaren Druckflssigkeiten; Prfung der Einwirkung auf Metallwerkstoffe in keeping with current practice in standards published by
2、the International Organization for Standardization (KO), a comma has been used throughout as the decimal marker. 1 Field of application This standard covers fire-resistant hydraulic fluids in the form of class HFAE emulsions prepared from test water and emulsifiable concentrate as specified in DIN 2
3、4 320. 2 Scope The method of test described here serves to provide information on the corrosion behaviour of ready-to-use emulsions when stored without being disturbed. 3 Unit The unit in which the difference in specimen mass before and after testing is given shall be the mg. 4 Principle An emulsion
4、 consisting of a concentrate and test water and in a concentration corresponding to that used in the given application is prepared by stirring. Specimens are then partly immersed in this emulsion for 28 days at 35 OC, and the change in their mass and appearance and any visible changes in the emulsio
5、n determined. 5 Designation Designation of the method of testing the compatibility of fire-resistant hydraulic fluids with metals (LI: Test DIN 51 345 - L 6 Apparatus and reagents 6.1 Apparatus The following apparatus shall be used: a) test assembly (see figure 1) consisting of the following compone
6、nts: aa) 400 ml tall form beaker with volume scale, e.9. DIN 12 331 - H 400 beaker; ab) watch glasses having a diameter of 80 mm, e.g. DIN 12 341 - 80 watch glasses, and a centre hole of 6 mm diameter; ac) glass hooks or polyamide threads; 4 t i il 1 400mlbeaker 2 Specimen 3 Test emulsion 4 Watch gl
7、ass with hole 5 Stopper with hole 6 Glass hook Figure 1. Test assembly Continued on pages 2 to 4 Beuth Verlag GmbH. Berlin, has the exclusive right of sale for German Standards (DIN-Normen). DIN 51 345 Engl. Price group . Sales No. 0105 01.90 Page 2 DIN 51 345 ad) M 5 x 20 slotted cheese head screws
8、 as specified in DIN 84 and two nuts, both made of polyamide; ae) stopper with hole. b) oven, e.g. as specified in DIN 50 O11 Part 1, capable of being maintained at (35 f i) OC and accommo- dating the test assembly containing the test emulsion; c) balance with 0,2 mg scale intervals; d) 1 DIN 12 331
9、 - H 1000 beaker; e) 25 ml graduated pipette with 0,l ml scale intervals, e.g. DIN 12 697 - MPAS 25-01 pipette; f) stirrer with a speed of (750 f 25) min-, fitted with a stainless steel stirrer blade 120 mm long, 19 mm wide and 1.5 mm thick; abrasive papers of the following grades: DIN 69 176 - P 40
10、0, and DIN 69 176 - P 600; tall form beaker with volurne scale, e.g. g) electrocorundum-coated DIN 69 177 - 115 X 140 DIN 69 176 -P 120, DIN 69 176 - P 240, h) DIN 19 310 - A surgical cellulose wadding. 6.2 Reagents The following reagents shall be used: a) DIN 24 320 test water; b) acetone (2-propan
11、one); c) n-heptane; d) DIN 51 633 - C7H8 pure toluene. 7 Sampling The emulsifiable concentrate, which is to comply with DIN 24 320, shall be sampled as described in DIN 51 750 Parts 1 and 2. 8 Specimens 8.1 Shape The specimens shall have the shape and dimensions shown in figure 2 and shall be made o
12、f the following materials: a) Ck 45 quenched and tempered steel as specified in b) AL 99,5 aluminium as specified in DIN 1712 Part 3; c) DIN 17 660 - CuZn37 alloy (copper-zinc alloy); d) E 1 -Cu 58 electrolytically refined, oxygen-containing e) Zn99.95 high-grade zinc or high-grade zinc having DIN 1
13、7 200, with ground surface; copper as specified in DIN 1708; a higher degree of purity, as specified in DIN 1706. 8.2 Pretreatment Before grinding the specimens, deburr the edges using electrocorundum-coated abrasive papers of grades DIN 69 176 - P 240 and DIN 69 176 - P 400. Treat the specimens wit
14、h clean electrocorundumcoated abrasive papers of grades DIN 69 176 - P 120, DIN 69 176 - P 240, DIN 69 176 - P400and DIN 69 176 - P 600, in that order. Then clean the specimens with dry wadding and rinse with n-heptane. After evaporating the solvent adhering to the specimens, weigh them and perform
15、the test. During and after cleaning, handle the specimen with tweezers. Dimensions in mm General tolerances: as in DIN 7168, accuracy grade m. both concentrate and test water shall have a temperature of (25 f 2) OC. Prior to use, clean the stirrer with pure toluene and acetone. Ensure that there is
16、a clearance between stirrer blade and beaker bottom of about 20 mm and set the speed at 750 min-. Hold the pipette so that the concentrate is discharged from a height of about 3 cm onto the upper third of the liquid cone formed by stirring. The pipette shall not drain completely but remain filled to
17、 the zero mark. If necessary, add the concentrate in two portions. After adding the specified volume of concentrate, continue stirring for five minutes and then pour 250 ml of emulsion into the beaker of each test assembly. When emulsifying larger amounts of concentrates containing mineral oils, cho
18、ose stirrer type and speed so as to ensure that a stable emulsion is formed. Prepare and test the emulsion on the same day. DIN 51 345 Page 3 2 i 1 Specimen (see figure 2) 2 Plastic screwhut assembly 3 Polyamide thread 1 Figure 3. Specimen assembly 9.2 Testing Suspend a specimen or two specimens at
19、a time (by a hook or a polyamide thread) in each beaker containing the emulsion so that the specimen is immersed to a depth of (60 f 1) mm. When testing two specimens at a time, use a plastic screw and two nuts, as shown in figure 3, to hold the specimens in position so as to prevent the occurrence
20、of electrical conduction. Then place the beakers in an oven preheated to a temperature of (35 t 1) “C. Continue the test for a period of 672 hours (= 28 days). After removal of the specimens from the beaker, examine them for visible deposits. Next, in order to remove the emulsion completely, immerse
21、 them several times, if necessary, first in acetone, then in n-heptane. Weigh the specimen after allowing its surface to dry in air. Examine the specimen for tarnish and the emulsion for any signs of change. A loss of emulsion due to evaporation not exceeding 15 % by volume during the test period is
22、 permissible. Handle the specimen with tweezers during testing and evaluation (see clause 10). 10 Evaluation Compatibility on the basis of the following criteria: a) any deposits on the specimen surface before cleaning; b) difference in specimen mass before and after testing; c) tarnishing of the sp
23、ecimen after cleaning; d) any changes in the emulsion. 11 Expression of results With reference to this standard, report the difference in mass of the specimen, in mg, to the nearest 1 mg, indi- cating an increase in mass by + and a decrease by -. When rounding to the last significant place, take acc
24、ount of the specifications given in DIN 1333 Part 2. State any changes found in the evaluation described in clause 10. Page 4 DIN 51 345 Standards referred to DIN 84 DIN 1333 Part 2 DIN 1706 DIN 1708 DIN 1712 Part 3 DIN 1768 Part 1 DIN 2331 DIN 2341 DIN 12697 DIN 17200 DIN 17660 DIN 19310 DIN 24 320
25、 DIN 50 O11 Part 1 DIN 51 633 DIN 51 750 Part 1 DIN 51 750 Part 2 DIN 69 176 Part I DIN 69 177 Slotted cheese head screws Presentation of numerical data; rounding Zinc Copper; cathodes and refinery shapes Aluminium; semi-finished products General tolerances; I inear and angular dimensions Laboratory
26、 glassware; beakers Laboratory glassware; watch glasses Laboratory glassware; fast delivery class AS graduated pipettes with a waiting time of 15 seconds Steels for quenching and tempering; technical delivery conditions Wrought copper alloys; copper-zinc alloys; composition Surgical dressings; surgi
27、cal cellulose waddings Fire-resistant hydraulic fluids, class HFAE; properties and requirements Testing of materials, components and equipment; ovens; concepts and requirements Benzene and benzene homologues; requirements Testing of petroleum; sampling; general introduction Testing of petroleum; sam
28、pling of liquid substances Electrocorundum and silicon carbide particles for coating abrasive backings; designation and particle size distribution Rectangular abrasive papers Other relevant documents 6. Luxemburger Bericht ber Anforderungen und Prfungen sch werentflammbarer Flssigkeiten zur hydrauli
29、schen Kraftbertragung und Steuerung (6th Luxembourg report on the requirements relating to testing of fire-resistant fluids for hydraulic power transmission and control), published by the Commission of the European Communities, P.O.BOX 1003, Luxembourg 1. CETOP 48 H - Verfahren zur Bestimmung der Ko
30、rrosionseigenscha ften waserhaltiger, schwerentflammbarer Druck- flssigkeiten (Method of determining the corrosion properties of fire-resistant hydraulic fluids containing water), issued by the European Committee for Oil Hydraulics and Pneumatics and obtainable from Maschinenbau- Verlag GmbH, Postfa
31、ch 71 O1 09, 0-6000 Frankfurt 71. Explanatory notes This standard has been prepared by Subcommittee 661.2 Prfung von Khlschmierstoffen of Fachausschu Minerall- und Brennsroffnormung of the Normenausschu Materialprfung (Materials Testing Standards Committee). At present, the precision cannot be specified for lack of sufficient data. International Patent Classification G O1 N 17/00 C 10M 171/00 C 1 O M 173/00
