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ECSS-Q-70-20A, SPACE PRODUCT ASSURANCE, DETERMINATION OF THE SUSCEPTIBILITY OF SILVER-PLATED COPPER WIRE AND CABLE TO "RED-PLAGUE" CORROSION (19 DEC 2

ECSS-Q-70-20A, SPACE PRODUCT ASSURANCE, DETERMINATION OF THE SUSCEPTIBILITY OF SILVER-PLATED COPPER WIRE AND CABLE TO "RED-PLAGUE" CORROSION (19 DEC 2000)., Silver-plated copper conductors are suitable for general spacecraft use, but it is essential that the plating is of uniform thickness of at least 2 μm. Localized damage due to wire or cable fabrication processes (e.g. stranding, braiding, application of insulation jackets) can result in spots in the plating where the thickness is less that 1 μm.Wire strands supporting silver platings less than 1 μmthick are susceptible to red-plague corrosion. The deleterious effects to be anticipated as a result of testing wires and cables to the requirements of this Standard, which is accelerated by means of oxygen, high humidity and elevated temperature, include corrosion of all defective silver-plated conductor materials and shielding braid or the strands of internal conductors. Silver-plated copper wires or cables that are tested and successfully pass the acceptance criteria as defined in this Standard are considered not to suffer from degradation by red-plague corrosion during ten-year controlled storage periods and normal spacecraft service lifetimes.

ECSS-Q-70-20 Rev. A

    

Version:
A12-20005.45 MB ecss-q-70-20a

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