Richard As the gold is somewhat porous, I'd guess that the underlying Ni has oxidised during 1 week at 45 deg C (why????). Brian Richard Tilbrook wrote: > NEW MESSAGE: > > Hi folks, > Sorry, I wasn't feeling well yesterday and did not explan myself at all - the > reason I asked about baking is that we reflowed one side of a surface mount board > (gold on nickel); we then stored it in a 45'C oven as we were expecting the > remaining parts to arrive for this very urgent job. They unexpectedly took a week. > They even more unexpectedly didn't want to reflow properly when we tried reflowing. > I suggested "passivation" as something for the person who brought me the problem to > think about, though I must confess that being an industrial placement student, I am > not best equiped to make that kind of judgement. As I try to follow many of your TN > discussions, and occasionally add when I feel able, I was sure you'd be able to > give better reasons as to the cause and suggestions for either prevention or cure. > > Thanks and Regards, > > Richard Tilbrook > > PREVIOUS MESSAGE: > > Hi technetters, > I'm hoping to find out a bit more about the effect of baking (at 45 deg. C) on > boards with gold on nickel. > I would be grateful for any info on the sibject, including times, temperatures and > effects, such as passivation. > > Thanks, > > Richard TIlbrook > > ############################################################## > TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c > ############################################################## > To subscribe/unsubscribe, send a message to [log in to unmask] with following text in > the body: > To subscribe: SUBSCRIBE TECHNET <your full name> > To unsubscribe: SIGNOFF TECHNET > ############################################################## > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional > information. > If you need assistance - contact Keach Sasamori at [log in to unmask] or > 847-509-9700 ext.5315 > ############################################################## ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################