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Cleaning Leads on Parts

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#63147

Cleaning Leads on Parts | 17 November, 2010

We have a problem child part. Our company was in a pinch and ordered parts from a broker that had an old date code. The leads are very oxidized, and our reflow process is comprimised.

To prove the concept, we cleaned the leads with Tarn X and an acid brush. After cleaning they were rinsed in DI water, then baked.

The results were amazing, the part lead finish was very nice, and solder quality was that of a new part.

We may need to resort to this type of situation for future orders, until March, that is when we have our first guarenteed shipment of new parts.

I'm looking for a method or process for cleaning leads. What side effects do I pose if the process is correct?

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#63148

Cleaning Leads on Parts | 17 November, 2010

Why not just re-tin the parts?

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#63150

Cleaning Leads on Parts | 18 November, 2010

That was our first course of action, and we cannot get solder to adhere to the pins using an iron with solder roll, or by dipping them in a solder pot. We have added flux to the leads as well.

At the moment our only success has been with the use of a cleaner.

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#63151

Cleaning Leads on Parts | 18 November, 2010

There are companies that specialize in this sort of thing, and can re-tin the parts in bulk/batch methods.

I just came across North Shore components, who offer this service: http://www.nscomponents.com/in-house-testing/lead-tinning-services.html

You could also check out Corfin Industries, http://www.corfin.com.

I haven't used either of these services, and receive no incentive for recommending them.

cheers ..rob

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