EN 16602-70-20:2014

Space product assurance - Determination of the susceptibility of silver-plated copper wire and cable to "red-plague" corrosion

This Standard gives details of an accelerated screening test method and acceptance criteria to determine the suitability of silver­plated
wire and cable materials for use on spacecraft and associated equipment. The test method, which also determines the suitability of the associated fabrication processes, is based on the work of Anthony and Brown (1965). They established that “red­plague” originates at
breaks in the silver­plating of copper wire strands in the presence of moisture and oxygen. The environmental test system artificially promotes “red­plague” 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.

Raumfahrtproduktsicherung - Bestimmung der Anfälligkeit von silberbeschichtetem Kupferdraht und –kabeln für "red-plague"-Korrosion

Assurance produit des projets spatiaux - Détermination de la susceptibilité à la rouille rouge des fils et câbles en cuivre argenté

La présente norme décrit une méthode de sélection accélérée ainsi que les critères d'acceptabilité permettant de déterminer si les matériaux des fils et câbles argentés sont appropriés pour une utilisation sur un satellite et ses équipements associés, et si les procédés de fabrication associés sont adaptés. Cette méthode est basée sur le travail d'Anthony et de Brown (1965). Ces auteurs ont démontré que la « peste rouge » apparaît, en présence d'humidité et d'oxygène, aux endroits où l'argenture des torons des fils en cuivre est endommagée. Le système des essais d'environnement favorise, de manière artificielle, la corrosion peste rouge dans des conditions de laboratoire contrôlées, résultant d'une corrosion galvanique de l'âme du conducteur en cuivre.
La présente norme peut être adaptée aux caractéristiques et contraintes spécifiques d'un projet spatial, conformément à la norme ECSS-S-ST-00.

Zagotavljanje varnih proizvodov v vesoljski tehniki - Ugotavljanje občutljivosti posrebrene bakrene žice in kabla na korozijo "rdeče kuge"

Ta standard določa podrobnosti pospešene presejalne preskusne metode in meril sprejemljivosti za ugotavljanje ustreznosti posrebrene žice in materialov kabla za uporabo na letalskih plovilih in povezani opremi. Preskusna metoda, ki določa tudi ustreznost povezanih procesov izdelave, temelji na delu Anthonyja in Browna (1965). Ugotovila sta, da »rdeča kuga« izvira iz lomov v posrebrenosti snopov bakrenih žic v prisotnosti vlage in kisika. Okoljski preskusni sistem umetno spodbudi korozijo »rdeče kuge« pod nadzorovanimi laboratorijskimi pogoji kot rezultat galvanske korozije bakrenega vodniškega jedra. Ta standard se lahko prilagodi posameznim lastnostim in omejitvam vesoljskega projekta v skladu s standardom ECSS-S-ST-00.

General Information

• Status: Published
• Publication Date: 21-Oct-2014
• Withdrawal Date: 29-Apr-2015
• ICS: 49.090 - On-board equipment and instruments
• ICS: 49.140 - Space systems and operations
• Technical Committee: CEN/CLC/TC 5 - Space
• Drafting Committee: CEN/CLC/TC 5 - Space
• Current Stage: 9060 - Closure of 2 Year Review Enquiry - Review Enquiry
• Start Date: 03-Jun-2020
• Completion Date: 03-Jun-2020
• Mandate: M/496 - Mandate addressed to CEN, CENELEC and ETSI to develop standardisation regarding space industry (Phase 3 of the process)
• Ref Project: SIST EN 16602-70-20:2015 - Space product assurance - Determination of the susceptibility of silver-plated copper wire and cable to "red-plague" corrosion

Overview

EN 16602-70-20:2014 - Space product assurance: Determination of the susceptibility of silver‑plated copper wire and cable to “red‑plague” corrosion - is a CEN European Standard that defines an accelerated screening test and acceptance criteria to assess whether silver‑plated copper wires and cables are suitable for spacecraft and associated equipment. The method (based on Anthony & Brown, 1965) reproduces galvanic corrosion at breaks in the silver plating under controlled laboratory conditions by exposing samples to oxygen, moisture and elevated temperature.

Key topics and technical requirements

• Scope and purpose: Accelerated screening for “red‑plague” (cuprous oxide with possible cupric oxide) caused by galvanic interaction between silver and copper in the presence of humidity and oxygen. Can be tailored per project in conformance with ECSS‑S‑ST‑00.
• Sample preparation: Cut two adjacent samples from mid‑length (200 ± 50 mm); strip a 20 ± 5 mm section of outer insulation at the end to expose strands; splay braid/inner conductors for inspection.
• Test environment and sequence: Single sample per flask immersed over deionized water; oxygen supplied at (50 ± 10) bubbles/min; temperature maintained at (58 ± 2) °C; exposure duration 240 hours.
• Inspection and acceptance: Inspect within 3 hours post‑test; remove insulation and examine silver‑plated strands at ×20 magnification; photograph evidence. Classification system (see Table 5‑1 and Annex C) is used to rate corrosion extent (different rules for 19‑strand and 7‑strand conductors). Samples scored Code 4 or 5 require quantification of affected strands and may invoke further metallurgical analysis.
• Handling, identification and QA: Clean handling with lint‑free gloves, controlled storage, and sample identification (trade name, source, manufacturer code, batch, manufacture date, material and plating details). Test equipment list includes microscope, oxygen regulator, Erlenmeyer flask, deionized water, temperature bath, scalpel and cutters.

Applications and who uses it

• Primary users: Space product assurance engineers, electrical harness designers, cable and wire manufacturers, test laboratories, procurement and quality assurance teams working on spacecraft and space‑qualified equipment.
• Practical uses: Pre‑qualification of materials and fabrication processes; supplier screening; acceptance testing for flight harnesses; root‑cause investigation of plating failures; risk mitigation against in‑orbit conductor corrosion.
• Benefits: Provides a standardized, repeatable method to detect susceptibility to red‑plague corrosion, supporting reliability and safety of spacecraft wiring systems.

Related standards

• ECSS‑S‑ST‑00 (system requirements and tailoring guidance)
• ECSS‑Q‑ST‑70‑20 / EN 16602‑70 (Space product assurance - Materials, mechanical parts and processes)
• ECSS‑S‑ST‑00‑01 (glossary)

Keywords: EN 16602‑70‑20:2014, red‑plague, silver‑plated copper wire, space product assurance, corrosion testing, galvanic corrosion, spacecraft wiring, accelerated screening test.

Standards Content (Sample)

SLOVENSKI STANDARD
01-januar-2015
=DJRWDYOMDQMHYDUQLKSURL]YRGRYYYHVROMVNLWHKQLNL8JRWDYOMDQMHREþXWOMLYRVWL
SRVUHEUHQHEDNUHQHåLFHLQNDEODQDNRUR]LMRUGHþHNXJH
Space product assurance - Determination of the susceptibility of silver-plated copper wire
and cable to "red-plague" corrosion
Raumfahrtproduktsicherung - Bestimmung der Anfälligkeit von siblerbeschichtetem
Kuperdraht und -kabeln für "red-plague"-Korrosion
Assurance produit des projets spatiaux - Détermination de la susceptibilité à la rouille
rouge des fils et câbles en cuivre argenté
Ta slovenski standard je istoveten z: EN 16602-70-20:2014
ICS:
49.140 Vesoljski sistemi in operacije Space systems and
operations
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 16602-70-20
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2014
ICS 49.090; 49.140
English version
Space product assurance - Determination of the susceptibility of
silver-plated copper wire and cable to "red-plague" corrosion
Assurance produit des projets spatiaux - Détermination de Raumfahrtproduktsicherung - Bestimmung der Anfälligkeit
la susceptibilité à la rouille rouge des fils et câbles en von silberbeschichtetem Kupferdraht und -kabeln für "red-
cuivre argenté 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. 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 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 Austria, 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, 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 Ref. No. EN 16602-70-20:2014 E
worldwide for CEN national Members and for CENELEC
Members.
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 Handling 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 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
Annex 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 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 (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

Foreword
This 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 publication 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 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 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, 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, Switzerland, Turkey and the United
Kingdom.
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 determines 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
promotes “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.
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 agreements 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-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
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
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 is a
prerequisite.
3.3 Abbreviated terms
The abbreviated terms defined in ECSS-S-ST-00-01 apply.

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 the 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 re
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