SAE AIR 5919B-2017 Alternatives to Cadmium Plating.pdf

1、 _ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising ther

2、efrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2017 SAE International All rights reserved. No part of this

3、publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-49

4、70 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/standards.sae.org/AIR5919B AEROSPACE INFORMATION REPORT AIR5919 REV. B Issued 2003-09 Revised 2017-10 Supersedin

5、g AIR5919A Alternatives to Cadmium Plating RATIONALE Revision required to up-date publication infomation, correct editorial errors and any known technical data, and include Tin-Zinc as another alternative replacement for Cadmium. FOREWORD General use connectors and associated connector accessories d

6、esign to operate in severe environments traditionally utilize aluminum alloy as the standard base material and plated with cadmium to protect the base material from corrosion. Due to recent legislation regarding Health and Safety issues, there is an on-going effort to eliminate cadmium from these sy

7、stems. INTRODUCTION The purpose of this document is to provide information and guidelines for evaluating alternate surface treatment finishes, for general use connectors and associated connector accessories, typically associated with military defense electronics, weapon systems and commercial aerosp

8、ace applications. This Aerospace Information Report (AIR) addresses the essential elements for testing and evaluating alternative surface treatment finishes and the resulting performance capabilities they offer when compared to cadmium plating. Surface treatment finishes discussed in this document h

9、ave been tested to the same qualification requirements used to determined acceptability of general connectors and associated connector accessories when tested in accordance with the applicable EIA364 test method for electrical performance and suitability in severe environments. 1. SCOPE 1.1 This SAE

10、 Aerospace Information Report (AIR) is intended to document and provide access to information obtained by an industry survey. It summarizes and documents data regarding possible alternatives to the use of cadmium plating on general connectors and connector accessories typically used in aerospace and

11、 military defense electrical interconnect systems. 2. APPLICABLE DOCUMENTS The following publications form a part of this document to the extent specified herein. The latest issue of SAE publications shall apply. The applicable issue of other publications shall be the issue in effect on the date of

12、the purchase order. In the event of conflict between the text of this document and references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. SAE INTERNATIONAL AIR59

13、19B Page 2 of 10 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org. AMS-C-26074 Electroless Nickel Coatings AMS-QQ-P-35 Passivation Treatments for Corrosion

14、-Resistant Steel AMS-QQ-P-416 Plating, Cadmium (Electrodeposited) AMS2434 Plating, Tin-Zinc Alloy AIR4789 Aerospace Information Report on Evaluating Corrosion Testing of Electrical Connectors and Accessories for the Purpose of Qualification AS85049 Connector Accessories, Electrical General Specifica

15、tion For 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM B26/26M Aluminum Alloy Sand Castings ASTM B85 Aluminum Alloy Die Castings ASTM B117 Standard Practice for Operating Salt Spr

16、ay (Fog) Apparatus ASTM B209 Aluminum and Aluminum Alloy Plate and Sheet ASTM B211/221 Aluminum and Aluminum Alloy, Bar, Rod, Wire or Shapes, Rolled, Drawn, Extruded or Cold Finished ASTM A342 Standard Test Methods for Permeability of Feebly Magnetic Materials ASTM B733 Autocatalytic Nickel-Phosphor

17、us Coating on Metal ASTM B841 Electrodeposited Coatings for Zinc Nickel Alloy Deposits ASTM G85 Modified Salt Spray Testing ASTM D1654 Standard Test Method for Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments 2.3 U.S. Government Publications Copies of these documents are

18、 available online at http:/quicksearch.dla.mil. MIL-STD-202 Test Methods for Electronic and Electrical Component Parts MIL-DTL-24308 Connectors, Electric, Rectangular, Miniature, Polarized Shell, Rack and Panel MIL-DTL-28840 Connectors, Electrical, Circular, Threaded, High Density, High Shock, Shipb

19、oard, Class D, General Specification for. MIL-DTL-38999 Connectors, Electrical, Circular, Miniature, High Density, Quick Disconnect, Bayonet, Threaded temperature to be 125C for M26482 connector types. 3/ Durability: Mate/unmate cycles shall be 50 after salt spray conditioning for M28840 connector t

20、ypes. Table 1B - Test requirement/sequence rectangular connectors Test Description Requirement Test Method Examination Plating is uniform in appearance and non-reflective Visual, unaided eye Plating Adhesion No blistering, peeling or separation of the plating or other damage detrimental to the opera

21、tion of the connector (applicable to composite base material connectors only) In accordance with MIL-DTL-38999 Temperature Cycling No blistering, peeling or separation of the plating or other damage detrimental to the operation of the connector EIA 364-32, Method A, Test Condition I, Test Duration A

22、 (5-cycles) except steps 3, temperature to be 125 C Durability 1/ Connectors shall show no defects detrimental to their operation and shall meet subsequent testing EIA 364-09 except 500 mate/unmate cycles prior to salt spray conditioning. Cycle rate not to exceed 200 cycles per hour Salt Spray (corr

23、osion) No separation of plating or exposure of base material when examined in accordance with AIR 4789 EIA 364-26, Test Condition B (48-hours) Durability 2/ Connectors shall show no defects detrimental to their operation and shall meet subsequent testing 500 mate / unmate cycles after salt spray con

24、ditioning. Cycle rate not to exceed 200 cycles per hour Mate / Unmate Force Recorded values shall meet the requirements specified in the applicable connector specification EIA 364-13, Method A except the rate shall be 1 to 10 inches per minute. The force applied to facilitate full mate/unmate shall

25、be measured and recorded 1/ Durability testing prior to salt spray conditioning and mate/unmate force testing applies to M24308 connector types only. 2/ Durability testing after salt spray conditioning applies to M83513 connector types only. SAE INTERNATIONAL AIR5919B Page 6 of 10 Table 2 - Test req

26、uirement/sequence connector accessories Test Description Requirement Test Method Test Group by Sequence 1 2 Examination Plating is uniform in appearance and non-reflective Visual, unaided eye X X Shell Conductivity 2.5 mV max EIA 364-83, measured from a point on the rear of the accessory to the conn

27、ector or dummy connector mounting flange X X Plating Adhesion No blistering, peeling or separation of the plating or any other condition that adversely affects the function of the accessory. (applicable to composite base material accessories only) In accordance with AS85049 X Temperature Cycling 2/

28、No blistering, peeling or separation of the plating or any other condition that adversely affects the function of the accessory. EIA 364-32, Method A, Test Condition V, Test Duration A (5-cycles) except steps 2 the mated connector set was rated as a 2. 4/ Durability and salt spray tested to 500 hour

29、s in accordance with table 1A. SAE INTERNATIONAL AIR5919B Page 9 of 10 Table 3 - Test summary evaluation matrix (continued) Surface Treatment (Finish) Basic Description Base Matl Sample Type the mated connector set was rated as a 2. 4/ Corrosion test in accordance with ISO-21207, Method B, Duration

30、5 (168-hours per week, 5 weeks total). SAE INTERNATIONAL AIR5919B Page 10 of 10 Table 3 - Test summary evaluation matrix (continued) Surface Treatment (Finish) Basic Description Base Matl Sample Type & Source # Compatibility: Cross-Mated Connector Set ShellConductivity Salt Spray (1000-hours)Salt Sp

31、ray (500-hours)Post ShellConductivity ShellConductivity Salt Spray (SO2 336-hours)Post ShellConductivity ShellConductivity Salt Spray (840-hours)Post ShellConductivity Teflon Ni coupled to Cadmium Alum Connector: Source 7 P R P P Teflon Ni (Enslic) coupled to Cadmium Alum P R F F Zinc-Ni coupled to

32、Cadmium Alum P R P P Zinc Cobalt coupled to Cadmium Alum P R P P Cadmium - control sample Alum P R P P Teflon Ni coupled to Cadmium SST P R P F Teflon Ni (Enslic) coupled to Cadmium SST P R P F Zinc-Ni coupled to Cadmium SST P R P F Zinc Cobalt coupled to Cadmium SST P R P F Cadmium - control sample SST P R P P Tin-Zinc coupled to Cadmium Alum Connector Source 8 P F P P Legend: P = Met requirement F = Failed to meet requirement N = Not tested R = Test not required PREPARED BY SAE SUBCOMMITTEE AE-8C1, CONNECTORS OF COMMITTEE AE-8, AEROSPACE ELECTRICAL/ELECTRONIC DISTRIBUTION SYSTEMS