Now there�s a conundrum. You want the �best way to clean leads�, but you want to use the worst type of flux for cleaning leads.
You say, �20% copper exposed� � * What happened to the solderability protection during this two-year storage? Wouldn�t the copper at least remain covered with solder, even if it didn�t solder well? * What is the level of coverage when you solder these components?
Hard to say based on the information you�ve provided. First and foremost get an account number for charging labor and materials to the mutt that bought-in the relays a couple of years early. Thoughts are: * Determine if your current AIM 263 NC flux will do the job. * Talk to your flux supplier to get a recommendation on a more active NC flux. * At one time, Cal recommended using ROSA to reclaim the effectiveness of HASL board solderability protection. Contact the folk at EMPF [search the fine SMTnet archives for contacts] to determine if this can be used on your relays. * If the relay case is closed, use an aqueous flux to tin the leads, clean them, and then use your standard NC processing. * Send the relays back to your supplier, pay a �restocking� charge, and buy new parts. * Use a contract lead tinner, like: XL Addenda 708.971.8843 fax8846 Gene Binkowski Six Sigma 1940 Concourse Dr San Jose, CA 95131 (408) 526-1350 Fax (408) 943-0447 sales@solderquik.com
Corfin Industries 7B Raymond Ave, Unit 7 Salem, NH 03079 603-893-9900 fax 6800 http://www.corfin.net admin@corfin.net Thomas Hamel Chip Pro 10390 E. Lakeview Dr #206 Scottsdale, AZ 85258 480-860-5790 Fax 8366 Processing Facility 1610 No. Freeway 35E #214 Carrollton, TX 75006 972-242-9455 fax 8497 http://www.chipro.com
reply »