SAE J2334 pdf download
SAE J2334 pdf download.Cosmetic Corrosion Lab Test.
Air circulation most be ufIiuenl to prevent tempwatuie stratification and allow drying of teat parts dur.tg the dry-off portion of the test cycle.
Air circuleton can be obtained through the use of a fan or forced air,
142 Salt Solution Appllcedoa—T he smples be subject to an application of salt sokition by use of one of the three methods shown as fvltows. Whicheve’ method employed. test samples and wntroI are raquied to be visibly moisttwet ckiflng the entire 15-minule interval of each test cycle.
a. lryvne,iron Method—Test specanens ers to be inenersed m the salt solution for a 15-minute lifervat of cecil test cycle.
b. Spray Method—A period or continuous died mpingemen( spray of the salt solution over the 15-minute interval that ensures the test specimens ere kept wet for the entire 1 5-minute interval. Avoid a high intensity (pressuref spray that ewy affect test results, CNote 5) Both deed solution deplacemert arid atomized spray are suitable for this method
ç.Apphcations of the salt solution to the test specimens by a 15-minule eaposure to atomized fog provided the fog collection rate is 2 to 4 ntAi instead of 1 tO 2 mLJti (coaection rate as defined in ASTM 0 1735). The use of this method requires that the collection rates be documented
NOTE 1—Either the dec)2 ci NaHCO3 material moat be dissolved separately in Dl water (Reference ASTU 0 1193 Tyoe IV) trnd then at.hied 10 the sobjticin of other niaterisis II ci sohd rrv*teiials are added at the same time in a dry stale, an insouble prscip4ate may raaait. Ifs preopitale fonew and a spray appbcation is used to apply the solution. 4 m5y be neceesmy to remove the precipitate to avoid clogg rig of nozztes (t.e., flttct or siphon solution). Any liter media used must be inert to the solution being used A 20 to 100 micron cotton r nylon intell filler eçiil be suitable. Do not attempt to dISSOIV tile preciptete by adding acid
NOTE 2—Measurerecord pH of the sail solution prw to the start of test and on a weekly basis therealter (Reference ASTM E 70-90). Do not attempt to acust lila pH with Cny foni of buffers.
NOTE 3—The releority of the devefopmen( of this specitcation was performed using the rvnersion method of salt solution application This method was used as the basis when compaflrig other methods of salt solutloo epptcst.ons as wel as other variables,
NOTE4—AfreshfypreperedtestsokionwtlihaveaconductiviIyof10lo l2msat2SCt2’C. Measi.eano reoorcl the conductivIty (In units of ma) of tile salt solution alter misIng, prior to tile last amount being used, and as needed to ensure that the conductivIty of the solution remains between 10 to 12 ma at 25 C
NOTE 5—Careful nrenten should be pain 10 the spray method to avoid a high intensity sway that may affect test results by removal of the corrosw,,n product. removal of the coating or driving soejhon into the corrosion products
It is recorTwnended that tile lest solution be changed weekly and that agitahonhtirrlng of the solution be done prior to the salt solution application
Test Procedure
5.1 Test Cycle—The test cycte is ouIined in FQSe 1(5 daylweek — manual operation) arid Figre 2 (7 cleylweek
– automatic operation). It consists ci three basic stages:
1. Humid Stage—50 and 100% Humicltty, 6 hii c*ation.
2. Salt Application Stage—i S Thn di.wation oonouctec at antient conditions
3. DryStage—4OCand5O%RH.17hand45.mnindvation
The test cycle is repeated daily, Fully automatic cabinets have the option c( vunrnng during the weekends or proarnming an a hy stage soek for the weekends (typically 4 would be desired to run on weekends end hOSdays to ccirlete the test soon’) An exceotion to this rule would be 4 comparisons to other laboratones wto do not have fully automatic capabiltes te desired (for manual operatons. the weekend expoaure i typically maintained at &y stage condibons unless 7 day operations are available). Total teal duration ena weekend conditions rmist be documented in the test results. II two or more laboratories will be conducting tests on samLar parts 415 recommended that a oonstanVccmrnon weekend condieon be defined before testing begins.
