1、CE“ PREN*259L (PART*C7) 92 3404589 002b970 4 = Edition approved for publication 1992-06-05 A. E. C .M .A. STAN DARD NORME A.E.C.M .A. A.E.C.M.A. NORM Comments should be sent within six months C2 Chairman after the date of publication decision Technopolis - 175, rue Jean-Jacques Rousseau 921 38 Issy-
2、les-Moulineaux Cdex - FRANCE A.E.C.M.A. M. J. LE CUNFF prEN 2591 Part C7 Issue P 1 June 1992 EDITE PAR LASSOCIATION EUROPEENNE DES CONSTRUCTEURS DE MATERIEL AEROSPATIAL Technopolis - 175, rue Jean-Jacques Rousseau - F-92138 issy-les-Moulineaux Cdex -Tl. (i) 47.36.98.76 UDC : Key words ENGLISH VERSIO
3、N Aerospace series Elements of electrical and optical connection Test methods Part C7 - Salt mist Srie arospatiale Luft- und Raumfahrt Organes de connexion lectrique et optique Mthodes dessais Partie C7 - Brouillard salin Elektrische und optische Verbindungselernente Prfverf a h ren Teil C7 - Salzne
4、bel This .Aerospace Series. pre-standard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de MatrieIArospatial). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts of the concerned Commission folI
5、owing comment by the Member countries. Subsequent to the publication of this pre-standard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and signature of the AECMA
6、Standard Checking Centre NPS) and formal agreement of the Official Services of the Member countries it will be submitted as a draft European Standard to CEN (European Committee for Standardization) for final vote. CEN PREN*2593 (PART*C) 92 W 3404589 0026973 b W Q- prEN 2591-C7 Page 3 1 Scope and fie
7、ld of application This standard specifies a method of assessing the effects of the controlled salt-laden atmosphere on an element of connection. It shall be used together with EN 2591. This method shall not be considered as a method defining a general corrosion test. 2 References EN 2591 Aerospace s
8、eries - Elements of electrical and optical connection - Test methods - General EN 2591-Al Aerospace series - Elements of electrical and optical connection - Test methods - Part Al - Visual examination 1) EN 2591-65 Aerospace series - Elements of electrical and optical connection - Test methods - Par
9、t B5 - Housing (shelll electrical continuity 1) EN 2591 -D8 Aerospace series - Elements of electrical and optical connection - Test methods - Part D8 - Mating and unmating forces 2) 3 Preparation of specimens 3.1 The specimens shall be fitted with their normal accessories, wired and mounted accordin
10、g to the technical specification. When required by the technical specification, specimens shall be mated and unmated the number of times specified prior to the test. 3.2 Unless indicated in the technical specification, the following details shall be specified : - method of preparation, mounting and
11、position of specimens, - duration of the exposure, - method and requirements for final measurements, - mated or unmated elements of connection. 1) In preparation at the date of publication of the present standard. 2) Published as AECMA pre-standard at the date of publication of the present standard.
12、 Previous page is blank CEN PREN*2591 (PART*C7) 92 m 3404589 0026972 8 W prEN 2591-C7 Page 4 4 Apparatus The detail construction of the chamber including the method of producing the mist is optional, provided that : - the conditions in the chamber are within the specified limits in 4.1, - a sufficie
13、ntly large volume is available, so that these conditions are not influenced by the presence of the specimens, - no direct spray impinges upon the specimens under test, - drops of liquid cannot drip on the specimens. 4.1 Salt mist composition The solution for producing the salt mist shall be prepared
14、 by dissolving (50 f 1) g of sodium chloride (NaCe) analytical reagent quality in distilled or demineralised water to make up (1 f 0,02) e of final solution at 20 OC. The pH shall lie between 6,5 and 7,2. 4.2 The solution shall have a temperature equal to that in the chamber. 4.3 The sprayed solutio
15、n shall not be re-used. 5 Method 5.1 Initial measurements (if applicable) They shall be made according to the technical specification. 5.2 Procedure 5.2.1 The temperature in the test chamber and of the solution shall be maintained at (35 I 21 oc. 5.2.2 The spraying of the solution shall continue dur
16、ing the whole test duration. The pH value shall be monitored at the beginning and at the end of the test. 5.2.3 The specimens shall be divided into lots, so that they may be tested in ali of the positions specified in the technical specification. The specimens shall not be in contact with each other
17、 or with any other metal part. 5.2.4 The conditioning time shall be prescribed in the technical specification as either 48 h, 96 h or 500 h as well as the test condition of elements of connection, mated -or unmated. CEN PREN*259L (PARTxC7) 92 3404.589 002b973 T = prEN 2591-C7 Page 5 5.3 Recovery The
18、 specimens shall be washed in running and/or demineralised water and then dried. 5.4 Final measurements and requirements (if applicable) The specimens shall be submitted to the following tests : a) EN 259 1 -AI - Visual examination - With particular attention to : 1) cracking ; 2) flaking or peeling of the plating ; 3) pitting of exposed metal surfaces ; b) EN 2591-B5 - Housing (shell) electrical continuity ; c) EN 259 1 -D8 - Mating and unrnating forces.
