Hello, I'll really appreciate your help, in case you have an idea of the cause of our problem or in case we are missing sometingh. Recently we had a failure in the Salt spray test (mil DTL5541F)on coupons passed thru Alodine Process. 5 samples show between 10 and 34 Pits. In the last 5 months we haven't had more than 3 to 5 pits on the SS test. Currently we are controling on our process PH for al rinse tanks (Etch and alodine)and PH for Alodine (600) Tank, Chlorides (etch and alodine tanks), tanks temp, concentration of chemicals, PPMs on rinse and inmersion times. All those paramethers look great, no negative trends or something Out of spec. However, suddenly the Salt Spray test results fail. Are we missing monitoring any other critical parameter/characteristic?
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