Pb-free HASL is being used by some vendors, and one of our CMs prefers
this finish. Seems to solder just as well as the good ole' solder, or
so I'm told. We have been specifying Pb-free HASL on some boards for
the last 6 months, especially those that are cost sensitive.
Roger
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Peter Lymn
Sent: Thursday, September 21, 2006 9:04 AM
To: [log in to unmask]
Subject: Re: [LF] Galvanized RoHS & ENIG Finish
HASL is RoHS compliant. You only need to change the alloy used.
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: 21 September 2006 13:52
To: [log in to unmask]
Subject: Re: [LF] Galvanized RoHS & ENIG Finish
All surface finishes except HASL are RoHS compliant. I would strongly
recommend you do not convert your finishes to ENIG. Look at the postings
for the last two or three days to see examples of why not.
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Index Bruce Bryla
Sent: Thursday, September 21, 2006 6:26 AM
To: [log in to unmask]
Subject: Re: [LF] Galvanized RoHS & ENIG Finish
Good morning fellow Tec netters, first and foremost thank you all for
sharing your comments, experience and information. I have two questions.
1) Is an ENIG finish RoHS compliant or is its compliancy based on the
formula and / or process related?
We are looking at converting all our board finishes to ENIG to comply
with RoHS but in my research I can not locate any data that emphatically
states this finish is compliant. Many organizations that offer RoHS
alternatives list ENIG as an option.
2) I have been informed that passivation is RoHS compliant but have read
different opinion's as far as compliancy?
Any help would be greatly appreciated.
Bruce Bryla
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: Thursday, September 21, 2006 2:56 AM
To: [log in to unmask]
Subject: Re: [LF] Galvanized RoHS
Ah! But that is the American Galvanizers Association. What does the
European Galvanisers Association (or whatever they call themselves) say?
:-D
Brian
Tempea, Ioan wrote:
> John and John,
>
> one of our suppliers sent this paper, to justify the lead we are
> finding with the XRF machine. I will try to find where did they get it
> from, in the mean time, the only thing I know is that it has been
> written by the American Galvanizers Association.
>
> Regards,
>
> Ioan
>
> -----Original Message-----
> From: Leadfree [mailto:[log in to unmask]]On Behalf Of John R. Sieber
> Sent: Wednesday, September 20, 2006 1:09 PM
> To: [log in to unmask]
> Subject: Re: [LF] Galvanized RoHS
>
>
> Ioan,
>
> Where can I find this paper on testing coated galvanized steel for
> RoHS compliance?
>
> My understanding is that some steel applications use sheet metal with
> two coatings on it. The first coating is a Zn or Zn-Al alloy applied
> by either a galvanic or a hot-dip process. The second, outer coating
> is the chromate process. [Can chromite process be substituted?] If
> you obtain a depth profile of this multi-layer structure you see a
> blurring of the interfaces between materials. At the surface, there
> is carbonaceous matter. Underneath that is the Cr-bearing layer which
> gradually incorporates Zn (and Al if present) as it morphs into the
> galvanic or hot-dip coating. Deeper yet, the Zn or ZnAl layer
> increases in Fe content as it transitions into the surface of the
> steel. The extent of intermixing depends on whether there was an
> annealing step included prior to the application of the Cr coating.
> None of the layer boundaries are sharp and all contain other elements
> either as contaminants or as alloy constituents. In addition, none of
> the layers are uniform in thickness and composition across the entire
> area of the sheet metal.
>
> This description is meant to impress on you that coatings are ugly
> beasts that make terrible analytical specimens. Probably many of you
> already know this. From the perspective of an analytical chemist,
> there is nothing homogeneous about them. Depth profiles have been
> obtained using glow-discharge atomic emission spectrometry, which does
> not tell you the oxidation state of the Cr. One can probably study
> the outer Cr-containing coatings using X-ray photoelectron
> spectrometry and other microanalysis techniques. I'd be surprised if
> very many coatings companies have these techniques available for
> manufacturing QA.
>
> regards,
>
> John Sieber
>
>
> At 12:34 PM 9/20/2006, you wrote:
>> The galvanised coat is not homogeneous with the steel in respect of
>> the RoHS definition of homogeneous. If it were then no one would be
>> worrying about all the other plated finishes!!
>>
>> Regards,
>>
>> Chris
>>
>>
>> -----Original Message-----
>> From: Leadfree [mailto:[log in to unmask]] On Behalf Of Tempea, Ioan
>> Sent: 20 September 2006 17:20
>> To: [log in to unmask]
>> Subject: [LF] Galvanized RoHS
>>
>> Hi everybody,
>>
>> Steve has been kind enough to post a document I have sent to him. The
>> paper practically says that galvanized steel is not considered a
>> coated structure, therefore the homogeneous material take on
>> galvanized steel considers the base material and coating to be one
>> element.
>>
>> What do you think about this?
>>
>> Thanks,
>>
>> Ioan
>>
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----
---
>
> John R. Sieber, PhD
> Research Chemist
>
> National Institute of Standards and Technology Chemical Science and
> Technology Laboratory Analytical Chemistry Division 100 Bureau Drive,
> Stop 8391 Gaithersburg, MD 20899-8391 USA
>
> [log in to unmask]
> Tel: 1.301.975.3920
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>
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