Electronics Forum | Wed Sep 01 08:27:38 EDT 2004 | davef
Zinc from the brass [Cu3Zn2] diffuses into the tin causing solderability problems. Just 0.001% of Zn in your solder can render it fit for the scrap heap. So, you need a barrier plate between the brass and the tin. Copper or nickel-plating is commonl
Electronics Forum | Fri May 15 21:59:42 EDT 1998 | Earl Moon
| Hi, | There has been a lot of disputes in our company | about changing present HASL to another Finishing | which can provide more flatter pad surface in fine | pitch applications. ( perhaps Ni/Au, OSP ) | The target is to reduce solder defects, t
Electronics Forum | Tue Aug 07 19:32:40 EDT 2007 | davef
Zinc from the brass diffuses into the solder and reacts with tin causing dezincification. Dezincification is a specific type of de-alloying, or selective, leaching corrosion of brass fittings. This type of corrosion selectively removes zinc from th
Electronics Forum | Mon Apr 26 11:04:53 EDT 1999 | Dave F
| | Earl said, in essence: | | | | | Justin is absolutely right ... | | | | | | Again, Entek is not much more than a flux coating ... | | | | | | Metallic coatings protect best, as we all know - especially those electroplated. Those coatings chemi
Electronics Forum | Wed Jan 05 11:11:09 EST 2000 | Dave F
Hey Pat: My responses are: 1. Does anyone have experience with the shelf life on immersion white tin? If so, how long can the boards be stored without adversely affecting solderability. I've heard one year. No, we don�t, because we turn boards fa
Electronics Forum | Mon Aug 28 17:04:52 EDT 2006 | Board House
ImSn - Immersion Tin - Not Recomended- short shelf life ImAg - Immersion Silver - Prefered Surface finsh by most Board houses, Best reworkablility, 12 moth self life, ENIG - Electroless Nickel Immersion Gold - Second Choice for Board Shops, 12 -
Electronics Forum | Fri Aug 07 07:52:15 EDT 1998 | Earl Moon
| | Is there any problem using SMT on gold boards? 15 years ago we were told not to use gold boards, but I can't remember why. Judging by the other postings it now appears to be common. Only problem I see is that the nickel should be plated, not e
Electronics Forum | Mon Apr 26 17:45:26 EDT 1999 | Earl Moon
| | | Earl said, in essence: | | | | | | | Justin is absolutely right ... | | | | | | | | Again, Entek is not much more than a flux coating ... | | | | | | | | Metallic coatings protect best, as we all know - especially those electroplated. Those
Electronics Forum | Mon Aug 10 21:52:34 EDT 1998 | Dave F
| | | Is there any problem using SMT on gold boards? 15 years ago we were told not to use gold boards, but I can't remember why. Judging by the other postings it now appears to be common. Only problem I see is that the nickel should be plated, not
Electronics Forum | Tue Aug 11 07:51:57 EDT 1998 | Earl Moon
| | | | Is there any problem using SMT on gold boards? 15 years ago we were told not to use gold boards, but I can't remember why. Judging by the other postings it now appears to be common. Only problem I see is that the nickel should be plated, n
