You do not need to convert your board finish to comply with RoHS. If you
current finish is fused solder you will need to specify a lead free solder.
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Index Bruce Bryla
Sent: 21 September 2006 12:26
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
> Fax: 1.301.869.0413
> www.cstl.nist.gov/
>
> Identification of commercial items in this document does not imply
> endorsement by NIST or that items are
>
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