1、BSI Standards PublicationBS EN 16602-70-20:2014Space product assurance Determination of thesusceptibility of silver-platedcopper wire and cable to “red-plague“ corrosionBS EN 16602-70-20:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 16602-70-20:2014The UK
2、 participation in its preparation was entrusted to Technical Committee ACE/68, Space systems and operations.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users
3、 are responsible for its correct application. The British Standards Institution 2014. Published by BSI Standards Limited 2014ISBN 978 0 580 84594 9 ICS 49.090; 49.140 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the author
4、ity of the Standards Policy and Strategy Committee on 30 November 2014.Amendments/corrigenda issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 16602-70-20 October 2014 ICS 49.090; 49.140 English version Space product assurance - Determination of the susce
5、ptibility of silver-plated copper wire and cable to “red-plague“ corrosion Assurance produit des projets spatiaux - Dtermination de la susceptibilit la rouille rouge des fils et cbles en cuivre argent Raumfahrtproduktsicherung - Bestimmung der Anflligkeit von silberbeschichtetem Kupferdraht und -kab
6、eln fr “red-plague“-Korrosion This European Standard was approved by CEN on 11 April 2014. CEN and CENELEC 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.
7、Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN and CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language
8、 made by translation under the responsibility of a CEN and CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN and CENELEC members are the national standards bodies and national electrotechnical committees of Austri
9、a, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden,
10、 Switzerland, Turkey and United Kingdom. CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN/CENELEC All rights of exploitation in any form and by any means reserved worldwide for CEN national Members and for CENELEC Members. Ref. No. EN 16602-70-20:2014 EBS EN 16602-70-20:2014
11、Table of contents Foreword 4 1 Scope . 5 2 Normative references . 6 3 Terms, definitions and abbreviated terms 7 3.1 Terms defined in other standards . 7 3.2 Terms specific to the present standard . 7 3.3 Abbreviated terms. 7 4 Principles 8 5 Requirements 9 5.1 Preparatory conditions 9 5.1.1 Handlin
12、g and storage 9 5.1.2 Identification 9 5.1.3 Test equipment . 9 5.2 Test procedure . 10 5.2.1 Preparation of test samples . 10 5.2.2 Test sequence 11 5.3 Acceptance criteria . 13 5.3.1 Inspection of sample . 13 5.3.2 Acceptance and rejection criteria 13 5.4 Quality assurance . 14 5.4.1 Data 14 5.4.2
13、 Calibration and traceability 14 Annex A (normative) Red-plague evaluation report - DRD 15 A.1 DRD identification . 15 A.1.1 Requirement identification and source document 15 A.1.2 Purpose and objective . 15 A.2 Expected response . 15 A.2.1 Scope and content 15 A.2.2 Special remarks 15 EN 16602-70-2
14、0:2014 (E)BS EN 16602-70-20:2014Annex B (informative) Example of red-plague evaluation report template 16 Annex C (informative) Codes for extent of corrosion 18 Bibliography . 25 Figures Figure 5-1: Sketch of prepared test cable . 11 Figure 5-2: Example of test equipment . 12 Figure B-1 : Example of
15、 red-plague test report sheet . 17 Figure C-1 : Extent of Corrosion (per 20 cm length/test sample): Code 0 . 19 Figure C-2 : Extent of Corrosion (per 20 cm length/test sample): Code 1 . 20 Figure C-3 : Extent of Corrosion (per 20 cm length/test sample): Code 2 . 21 Figure C-4 : Extent of Corrosion (
16、per 20 cm length/test sample): Code 3 . 22 Figure C-5 : Extent of Corrosion (per 20 cm length/test sample): Code 4 . 23 Figure C-6 : Extent of Corrosion (per 20 cm length/test sample): Code 5 . 24 Tables Table 5-1: Corrosion classification 14 EN 16602-70-20:2014 (E)BS EN 16602-70-20:2014Foreword Thi
17、s document (EN 16602-70-20:2014) has been prepared by Technical Committee CEN/CLC/TC 5 “Space”, the secretariat of which is held by DIN. This standard (EN 16602-70-20:2014) originates from ECSS-Q-ST-70-20C. This European Standard shall be given the status of a national standard, either by publicatio
18、n of an identical text or by endorsement, at the latest by April 2015, and conflicting national standards shall be withdrawn at the latest by April 2015. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not
19、 be held responsible for identifying any or all such patent rights. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. This document has been developed to cover specifically space systems and has therefore precedence over
20、any EN covering the same scope but with a wider domain of applicability (e.g. : aerospace). According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, C
21、zech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United King
22、dom. EN 16602-70-20:2014 (E)BS EN 16602-70-20:20141 Scope This Standard gives details of an accelerated screening test method and acceptance criteria to determine the suitability of silver-plated wire and cable materials for use on spacecraft and associated equipment. The test method, which also det
23、ermines the suitability of the associated fabrication processes, is based on the work of Anthony and Brown (1965). They established that “red-plague” originates at breaks in the silver-plating of copper wire strands in the presence of moisture and oxygen. The environmental test system artificially p
24、romotes “red-plague” corrosion under controlled laboratory conditions as a result of galvanic corrosion of the copper conductor core. This standard may be tailored for the specific characteristics and constraints of a space project in conformance with ECSS-S-ST-00. EN 16602-70-20:2014 (E)BS EN 16602
25、-70-20:20142 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this ECSS Standard. For dated references, subsequent amendments to, or revisions of any of these publications do not apply. However, parties to agree
26、ments based on this ECSS Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references the latest edition of the publication referred to applies. EN reference Reference in text Title EN 16601-00-01 ECSS-
27、S-ST-00-01 ECSS system Glossary of terms EN 16602-10-09 ECSS-Q-ST-10-09 Space product assurance Nonconformance control system EN 16602-20 ECSS-Q-ST-20 Space product assurance Quality assurance EN 16602-70 ECSS-Q-ST-70 Space product assurance Materials, mechanical parts and processes EN 16602-70-20:2
28、014 (E)BS EN 16602-70-20:20143 Terms, definitions and abbreviated terms 3.1 Terms defined in other standards For the purpose of this Standard, the terms and definitions from ECSS-S-ST-00-01 apply, in particular for the following terms: corrosion 3.2 Terms specific to the present standard 3.2.1 batch
29、 quantity produced at one operation NOTE One batch can be subdivided into several lots. 3.2.2 red-plague red-coloured cuprous oxide (possibly with some black cupric oxide) corrosion product that forms when a galvanic cell is formed between copper and silver NOTE The presence of humidity or moisture
30、is a prerequisite. 3.3 Abbreviated terms The abbreviated terms defined in ECSS-S-ST-00-01 apply. EN 16602-70-20:2014 (E)BS EN 16602-70-20:20144 Principles The principles of the corrosion test to determine the susceptibility of silver plate copper wire and cable to red-plague corrosion is to submit t
31、he item to be tested (wire and cable) for to a certain period of time to an oxygen rich atmosphere at elevated temperature in order to evaluate the resistance of the item to deleterious effects as copper removal as a result of corrosion For this purpose the activities related to corrosion test stand
32、ardization requirements are specified in clause 5. It is important to perform the work taking into account health and safety regulations, and in particular the national standards on this subject. EN 16602-70-20:2014 (E)BS EN 16602-70-20:20145 Requirements 5.1 Preparatory conditions 5.1.1 Handling an
33、d storage a. The supplier shall handle all samples of wires and cables only with clean nylon or lint-free gloves. b. The supplier shall store the samples before and after testing in a clean area. 5.1.2 Identification a. The samples of wires and cables submitted for testing shall be identified by the
34、 following: 1. Trade name 2. Source 3. Manufacturers code number 4. Batch number 5. Date of manufacture b. The construction details of wires or cables shall include the following details: 1. Form 2. Principal dimensions 3. Description of insulation and conductor materials 4. Plating materials and th
35、eir nominal thicknesses 5.1.3 Test equipment a. The supplier shall use the following test equipment for the test method: 1. Microscope, at least 20 magnification with attachment to enable photomicrograph. 2. Conical glass flasks NOTE For example: Erlenmeyer 250 ml. 3. Natural two holed rubber stoppe
36、rs EN 16602-70-20:2014 (E)BS EN 16602-70-20:20144. Glass tubing having 3 mm - 6 mm internal diameter 5. Supply of oxygen gas 6. Gas flow regulator NOTE For example: Hoffman clips 7. Stock of deionized water 8. Length of copper wire having 1 mm - 2 mm diameter 9. Water trough, or other suitable tempe
37、rature-control bath 10. Heater with temperature regulator 11. Thermometers 12. Scalpel and wire cutters that produce a shear 90 end cut 13. Any additional equipment enabling metallurgical analysis to be performed when called up by 5.3.1b. 5.2 Test procedure 5.2.1 Preparation of test samples a. The s
38、upplier shall take the wire or cable to be submitted to this test procedure from stock with minimum handling. b. The supplier shall remove any particles or contamination visible on the outer insulation under a magnification of 10 with a clean, lint-free cloth. c. The supplier shall cut two adjacent
39、test samples from the mid-length of the submitted wire or cable. Each test sample shall have a length of (200 50) mm. d. The supplier shall strip off insulation of one test sample and shall inspect the exposed (silver-)plated braid or strands visually for corrosion and contamination at a magnificati
40、on of 20. e. In case of shielded cable, the supplier shall remove all inner conductors, strip off insulation and inspect the cable. f. The supplier shall photograph any unusual features such as contamination or corrosion products present on the exposed (silver-)plated strands for control reference.
41、g. The supplier shall prepare the second test sample for the corrosion test by removing the outer insulation jacket partially by using the scalpel blade. h. The incisions either circumferential or longitudinal, shall not damage the metal conductors. i. The length of outer insulation to be removed sh
42、all be (20 5) mm from the sample end as shown in Figure 5-1. j. The supplier shall splay the outer braid when inner conductors are present to give clear exposure of the cut ends of all inner strands. k. The supplier shall use sharp cutters to trim the inner conductors to ensure that the insulation h
43、as not sealed off the wires. EN 16602-70-20:2014 (E)BS EN 16602-70-20:2014(200 50) mm (20 5) mm Figure 5-1: Sketch of prepared test cable 5.2.2 Test sequence a. The test procedure shall be as follows: 1. Pour 200 ml of deionized water into the clean glass flask. 2. Insert the wire or cable sample in
44、to one hole of the two-hole stopper. NOTE Fix the wire in place with a short length of copper wire. 3. Insert a glass tube into the second hole, as shown in Figure 5-2. 4. Fit the stopper into the neck of the flask, together with a short length of copper wire to provide an air flow between flask and
45、 stopper. 5. Ensure that the glass tube extend into the deionized water. 6. Ensure that the end of the wire or cable sample is at a distance of (20 5) mm above the water surface. 7. Supply oxygen by connecting the glass tube with a plastic tube and a Hoffman clip (or other regulator) that controls t
46、he passage of oxygen into the water to maintain a flow rate of (50 10) bubbles per minute. 8. Place the test flask in a water trough or bath maintained at a temperature of (58 2) C. 9. Always test only one wire or cable sample per flask. NOTE If more than one test is performed at the same time, plac
47、e the flasks and oxygen flow in parallel to each other. b. The wire or cable sample shall be exposed for a duration of 240 hours. c. After completion of the test, the sample shall be removed from the flask and stopper. EN 16602-70-20:2014 (E)BS EN 16602-70-20:2014Insulated wire or cabl e sampl eRubb
48、er stopperCopper wireRegulatorO2 supplyAi r gapDei oni zed water at (58 2) C(20 5) mm(20 5) mmFigure 5-2: Example of test equipment EN 16602-70-20:2014 (E)BS EN 16602-70-20:20145.3 Acceptance criteria 5.3.1 Inspection of sample a. The inspection procedure shall be as follows: 1. Inspect the sample w
49、ithin three hours of being removed from the test apparatus. 2. Remove all insulation from the outer braid (when present) and at least from one of the inner conductors. 3. Inspect the silver-plated strands that make up braiding or inner conductor at a magnification of 20 for signs of contamination and corrosion. 4. Photograph specific areas of interest. 5. For samples comprising 19 wire strands, classify the extent of corrosion (per 20 cm length) present on the tested samples, on the basis of subjective visual inspection results, in accordance wi
