The barrier layer is to stop the migration of zinc into the solder (tin or
tin/lead).
I have never heard of zinc migration through gold especially a 2 µm thick
coating. I do not believe that any one would use this amount of gold for
solderability.
Best regards,
David Gowlett
Plating Technical director
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]]On Behalf Of Brian Ellis
Sent: 11 May 2004 09:10
To: [log in to unmask]
Subject: Re: [LF] FW: Re: Using Brass for interconnections
Yep, I agree that soldering brass is hairy and, quite often, we still
see brass components (tinned or nude) without any barrier layer. Believe
it or not, I've even seen brass components which were 2 µm thick
electrolytically hard-gold-plated (solder-in sockets) without a barrier
layer :-(
Brian
Bob willis wrote:
> Just comment again on a similar tac I would like to hear from suppliers
> on what they are doing on barrier plating on brass terminals. People I
> have spoken too seen to missing this and the problems associated with
> soldering to brass. Copper is often used as a barrier layer and nickel.
> If copper is being used how much more is being plated to overcome the
> copper dissolution and then the complete non wetting.
>
> Some time back a well known contributor to this forum made the point
> that they had failures.
>
>
> Bob Willis
> 2 Fourth Ave, Chelmsford,
> Essex, CM1 4HA, England
> Tel: 01245 351502
> Fax: 01245 496123
> Mobile: 07860 775858
> Email: [log in to unmask]
> Web: www.leadfreesoldering.com
> Web: www.bobwillis.co.uk
>
>
> -----Original Message-----
> From: Leadfree [mailto:[log in to unmask]] On Behalf Of Kim Rappard
> Sent: 10 May 2004 23:55
> To: [log in to unmask]
> Subject: [LF] FW: Re: Using Brass for interconnections
>
> Our product has an electronic controller, in some instances we use brass
> nuts and washers for terminating from our loom to various electrical
> circuits such as elements.
>
>
>
> The (RoHS) directive States "Lead as an alloying element in steel
> containing up to 0,35 % lead by
>
> weight, aluminium containing up to 0,4 % lead by weight and as a copper
> alloy containing up to 4 % lead by weight"
>
>
>
> Brass is not covered in the directive!
>
>
>
> Brass usually contains lead for machining.
>
> Does this mean we are unable to use brass as an electrical conductor?
>
>
>
>
>
> Kim Rappard
> Electronics Development Engineer
>
>
> Main Number +64 (3) 363 9293
> Direct Dial +64 (3) 363 9515
> Fax +64 (3) 363 9294
> <mailto:[log in to unmask]>
> <mailto:[log in to unmask]> [log in to unmask]
> <mailto:[log in to unmask]>
>
> 224 Armagh Street
> PO Box 13-705
> Christchurch
> NEW ZEALAND
>
> www.whispergen.com
>
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