Downloaded from https://www.everyspec.com MIL-STD-810D 19 JUIY 1983 METHOD 509.2 SALT FOG SECTION II 11-1 AWAEWIS 11-1.1 ~. The apparatus used in performing the salt fog test in this method shall include: a. A teat chamber with: . (1) Supporting.racka designed and constructed so that they will not affect the charaoteri~tics of “thesalt fog mist. All parta of the teat chamber and tha supporting racks that aoma into contact with the teat item shall ba constructed of material”or will be buffered with material that will not cauae elactrolytic corrosion. Condanaation shall not be allowed to drip on the test item.
No liquid that comes,in contact with eith’erthe exposure chamber or tha test ‘itemshall return to the salt solution reservoir. The exposure ohamber shall be proparly vented to prevent pressure buildup. (2) The capability”to maintain temperatures in the exposure zone at 35° C’(95° F). Satiafactory methods for controlling the temperature accurately are by housing the apparatus in a properly controlled constant- temperatura room, by thoroughly inaulatIng the apparatus and preheating the air to the proper temperature bafore the,atomization, or by jacketing the apparatua and controlling the temperature of the water or the air upad in the jacket.
.Theuae of irmneraionheatars within the chamber exposure area for the purpose of maintaining the temperature,within the axpoeure zone is prohibited. b.. A salt solution reservoir made of material that is nonraaotive with the salt solution, 4 .g., glaas, hard rubber, ‘orplastic. c. A meana for @ jecting the Salt solution into the teat ohamber. Caution,muetbe exercised to prevent clogging of the nozzlea from ealt buildup. Atomizers used shall be of such design and conatquctfon as to produce a finely divided, wet, dense fog. Atomizing nozzles and the”piping eystem shall be made of material that is nonreactive to the salt solution.
Suitable atomization hae been obtained in chambera having a ,volumeof leaa than 12 ft3 under the following conditions: . (1) required rate. Nozzle pressure as low as practical to produce fog at the ,. , Or~ficea between O.5 and 0.76 mm (O,02 and 0.03 inchee) in (2) ... diameter.e (3) 0.28m3 (10 ft3) Atomization.of approximately 2.8 liters of salt solution per of chamber voluma per 24 hours. MSTHOD 509.2 19 July 1983 ~o~.2-5