ASD-STAN PREN 2899-2016 Aerospace series Vulcanized rubbers Test on the susceptibility to corrosion in a damp atmosphere of metals in contact with vulcanized rubbers (Edition P 2).pdf

1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM ASD-STAN prEN 2899 Edition P 2 October 2016 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATION Rue Montoyer 10 - 1000 Brussels - Tel. 32 2 775 8126 - Fax. 32 2 775 8131 - www.asd-stan.org ICS: Supersedes edition P

2、1 of February 1997 Descriptors: ENGLISH VERSION Aerospace series Vulcanized rubbers Test on the susceptibility to corrosion in a damp atmosphere of metals in contact with vulcanized rubbers Luft- und Raumfahrt Vulkanisierte Elastomere Prfung der Korrosionsempfindlichkeit in Feuchtklima von Metallen

3、bei Berhrung mit vulkanisierten Elastomeren Srie arospatiale lastomres vulcaniss Essais de sensibilit la corrosion en atmosphre humide des mtaux au contact des lastomres vulcaniss This “Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and Defence In

4、dustries Association of Europe - Standardization). It is published for the needs of the European Aerospace Industry. It has been technically approved by the experts of the concerned Domain following member comments. Subsequent to the publication of this Prestandard, the technical content shall not b

5、e changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and review by users and formal agreement of ASD-STAN, the ASD-STAN prEN will be submitted as a draft European Standard (prEN) to CEN (European Committe

6、e for Standardization) for formal vote and transformation to full European Standard (EN). The CEN national members have then to implement the EN at national level by giving the EN the status of a national standard and by withdrawing any national standards conflicting with the EN. ASD-STAN Technical

7、Committee approves that: “This document is published by ASD-STAN for the needs of the European Aerospace Industry. The use of this standard is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibi

8、lity of the user.” ASD-STAN reviews each standard and technical report at least every five years at which time it may be revised, reaffirmed, stabilized or cancelled. ASD-STAN invites you to send your written comments or any suggestions that may arise. All rights reserved. No parts of this publicati

9、on may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of ASD-STAN. Order details: E-mail: salesasd-stan.org Web address: http:/www.asd-stan.org/ Edition approved

10、for publication 1st October 2016 Comments should be sent within six months after the date of publication to ASD-STAN Material Domain Copyright 2016 ASD-STAN prEN 2899:2016 (E) 2 Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Terms and definitions . 3 4 Principle . 3 5 Apparatus and au

11、xiliary products 4 6 Specimens 4 7 Test conditions . 5 8 Procedure. 5 9 Interpretation of results . 6 10 Designation 6 11 Test report . 7 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Material Domain. After inquiries and votes carried out in accordance with the

12、 rules of ASD-STAN defined in ASD-STANs General Process Manual, this standard has received approval for Publication. prEN 2899:2016 (E) 3 1 Scope This standard defines tests on the susceptibility to corrosion in a damp atmosphere of metals in contact with vulcanized rubbers. 2 Normative references T

13、he following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 2071,

14、 Aerospace series Sheets in aluminium and aluminium alloys Thickness 0, 25 mm a 6 mm Dimensions EN 22171), Steel FE-PL52 S 1 080 MPa Rm 1 250 MPa Sheets and plates 2 mm a 20 mm Aerospace series 2) EN 2395, Aerospace series Aluminium alloy AL-P2014A T4 or T42 Sheet and strip 0,4 mm a 6 mm EN 3525, Ae

15、rospace series Steel FE-PL1505 (15CrMoV6) Air melted Hardened and tempered Plate 6 mm a 20 mm 1 080 MPa Rm 1 280 MPa ISO 23529, Rubber General procedures for preparing and conditioning test pieces for physical test methods 3 Terms and definitions For the purposes of this document, the following term

16、s and definitions apply. 3.1 contact corrosion the visually perceptible deterioration of the metal surface in contact with rubbers, after exposure in a damp atmosphere 4 Principle The rubber test pieces shall be directly placed after immersion in the test fluid between two test metal disks and expos

17、ed to a damp atmosphere under defined conditions. After exposure, the metal disks shall be visually examined so that deterioration due to corrosion can be noted. 1) Inactive for new design, see EN 3525. 2) Published as ASD-STAN Standard at the date of publication of this standard by AeroSpace and De

18、fence industries Association of Europe - Standardization (ASD-STAN) (www.asd-stan.org) prEN 2899:2016 (E) 4 5 Apparatus and auxiliary products 5.1 Apparatus test assembly which enables a compression of (12 3) % of the rubber test pieces by means of metal disks (Figure 1); a device for producing x 20

19、 magnification; climatic chamber where a relative humidity of 95 % minimum can be obtained at (23 2) C. 5.2 Auxiliary products polyethylene gloves; appropriate solvent; lint free cotton cloth; test fluids. 6 Specimens 6.1 Metal disks 6.1.1 Material Type 1 Aluminium alloy AL-P2014A T4 or T42 accordin

20、g to EN 2395. Type 2 Steel FE-PL52S 1 080 MPa Rm 1 250 MPa according to EN 2217. 6.1.2 Dimensions The metal to be tested shall be circular disks of an outer diameter (120 0,5) mm, with a (20 00,2 ) mm diameter hole in the centre (see Figure 1). These disks shall be 5 mm thick minimum if they are in

21、steel and 10 mm minimum thick if they are in aluminium so that they are not deformed when gripped. 6.1.3 Preparation The metal disks shall have a roughness of 0,4 m maximum on all surfaces. The edges shall be rounded. 6.1.4 Number For each test and exposure method, use two metal disks. The two disks

22、 may be made of the same metal or of two different metals. 6.2 Rubber test pieces 6.2.1 Material According to the material standard. prEN 2899:2016 (E) 5 6.2.2 Dimensions (20 1) mm x (20 1) mm cut from test strips (2 0,2) mm thick. 6.2.3 Number Three test pieces for each test and exposure method. 6.

23、2.4 Time lapse between vulcanization and testing The test pieces shall be stored according to ISO 23529. 7 Test conditions 7.1 Test temperature The temperature shall be (23 2) C. 7.2 Testing time The testing time shall be 7 d or a multiple of 7 d. 7.3 Humidity The relative humidity shall be 95 % min

24、imum. 8 Procedure Clean all the surfaces of the metallic disks and the rubber test pieces with a lint free cotton cloth soaked in an appropriate solvent and leave to dry for 2 h minimum at (23 2) C. After cleaning, the degreased test pieces shall not be touched with bare fingers; they shall only be

25、handled with polyethylene gloves. Depending on the method chosen, the rubber test pieces and the metallic disks shall be conditioned as follows: Method A: The rubber test pieces and metallic disks shall be immersed in the test liquid for 15 min at a temperature of (23 2) C, then allowed to drain. Me

26、thod B: The rubber test pieces and metallic disks shall not undergo any conditioning. Next, place the rubber test pieces and the annular isolating block between the two metallic disks. The isolating block shall be chosen with a thickness such that the rubber test pieces are compressed by (12 3) %. T

27、ighten the assembly until it comes to rest against the block. prEN 2899:2016 (E) 6 Place the assembly in the test chamber in a damp atmosphere. NOTE The test pieces shall be placed at a distance of at least 10 mm from the edges of the metallic disks and arranged symmetrically (Figure 1). At the end

28、of exposure time, the test assembly shall be placed in a normal atmosphere for (30 5) min at (23 2) C. The metallic disks shall be separated from the rubber test pieces, then cleaned using appropriate solvents to eliminate all traces of rubber. The two metallic disks shall be then subjected to a vis

29、ual examination at x 20 magnification to detect any discolouration or sign of corrosion. 9 Interpretation of results Any discolouration or surface deterioration of the metal strip shall be described in the test report. 10 Designation EXAMPLE EN2899 A A Number of this standard Type of material used f

30、or metallic disks (see Table 1) Method used (A or B) Table 1 Type Code 1 and 1 A 1 and 2 or 2 and 1 B 2 and 2 C prEN 2899:2016 (E) 7 11 Test report the test report shall make reference to this standard and shall include the following information: test method (A or B); if test method A: Description o

31、f test liquid; type and designation of the tested product; batch and date of manufacture; material of metal disks; test environment; exposure time; number of tests; visible deteriorations of the metal disks/description of corrosion; any detail not provided for this standard of the subject of specific requirements; test date. prEN 2899:2016 (E) 8 Dimensions in millimetres Key 1 Metal disks 2 Isolating flanged ring 3 Stainless steel screw M18 4 Test piece thickness: 2 5 Polyamide isolating block 6 Washer 7 Steel axis Figure 1 Example of test assembly (metallic disks of the same material)