Din 50961 Fe Zn 12 B
Neomi Bensch
Q. When ASTM B633 specifies SC2 (Fe/Zn8) does this mean a minimum or an exact? Can the supplier send us material with a range of 8-12 microns with the 9-12 microns having a deposit build up which interferes with the functionality of our part?
Is the product that you are having a problem with a fastener? The spec. Fe/Zn 8 calls out a minimum specification (0.00031") for zinc on steel, I believe. However, a standard 2A/2B thread fit only has an allowance for finishing of 0.00025". If the plater is trying to meet the intent of the specification which you have called out, and the fastener is relatively long, it is very possible that there will be enough zinc on the starter thread to cause a thread interference. The same issue can occur on a stamping with a threaded hole.
Q. We have had a request regarding ZN 6 Passivate Blue. What does the 6 mean?
Why Blue over gold or clear?
Also what is passivate bi-chromatic?
Are there any links to good websites describing the finishes and passivation process?
A. David,
ZN6 passivate blue is zinc plating with blue passivation using hexavalent chrome.
Now since hexavalent chrome is being phased out, blue passivation with trivalent chrome process is commercially available which is superior to dichromate type hexavalent chromium process. The neutral salt spay life before white rust as well as the finish is better than the latter.
However, yellow iridescent passivation (what you are referring to as "gold") has better corrosion resistance than blue passivation ("clear.")
! I have read your question and read the answers. I must admit both could be correct. I think you need to go back to your customer and ask him exactly what he wants. It is a problem in the plating game when a customer gives a "spec" like that (internal spec) that is not clearly understood by the plater.
A. Hi Kim. Hopefully Joko's reply answered your question satisfactorily. Still I would warn that several different zinc plating specs might include similar codes like Fe, Zn8, and CM2, while including additional requirements about testing, lot size, etc. So you probably should be careful to call it out as "ASTM spec. no xxxx type Fe/Zn8/CM2" or "ISO xxxx type Fe/Zn8/CM2" or "Nissan xxxx type Fe/Zn8/CM2" or whatever is the case :-)Regards,
Q. I have a customer drawing that states on the finishing field the follows:
ZINC PLATE Fe/Zn 5 c 2C F-010.
As far as I know this is a Zinc Plating over steel, 5 microns, chromate; however I don't know what the rest of the spec. means "2C F-010".
Could somebody help me with this?
A. Can't you go back to your customer and ask what body issued the standard?
It has the look of a European standard but is not written in the manner which the relevant standard, BS EN 12329 demands. [ed. note: that spec has been superceded by BS EN ISO 2081]
Q. I have a print with this plate spec, and just want to make sure that I understand it correctly. As far as I know it is a .00031 min plate thickness, ROHS.
Is there a specific salt spray for this?
Any words of advise would be appreciated.
Hi Amy,
That is not a spec, it is a code within an unspecified specification number.
Joko and A.S.'s contradictory answers should serve as a warning not to proceed without knowing what spec number you are supposed to be following :-)Regards,
Q. Hello,
We have a customer from Japan that requires plating I have never heard. They are specifying Ep-Fe/Zn10 bk. I have contacted our plating shop and they have never heard of this type. It seems it is Zinc plating 10 microns thick, but what does the bk stand for? Please help.
Q. What is the meaning in the electrolytic coating spec "Fe/Zn8/F1" Pc:black passivation Cr+3Fe/Zn8/F1 - FTR 00025 for an electrolytic coating of zinc on steel, with a minimal thickness of 8, is having a black layer of Chrome III passivation?
Q. We have some steel fasteners in our older drawings with a description of "GRADE 5, 2C". Our internal part number corresponds to, for example, McMaster 90126A031. I assume that the 2C designation is meant to suggest the zinc-plated finish but I haven't been able to find a standard that it would be associated with. The only references I've found are ASTM A193 (appears to refer to a heat treat for SST) and BS1706, where it doesn't mean much without additional context. Our customer is now asking for clarification so I need to come up with an answer. Can anyone give me a hint? Thanks!
A. Hi Mark. My guess is that the fateners are stainless steel based on the spec you referenced, and that "2C" refers to the thread fit rather than having anything to do with zinc plating or chromating ... but this doesn't sound like a job to be guessed at, it sounds like a situation where a qualified engineer should study the drawing and issue an appropriate revision.
Luck & Regards,
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
What is SEZn-CM finishing?Q. Hi, I'd like to find out what is SEZn-CM finishing. This is stated in my customer drawing under surface treatment so I'm checking what finishing is this.Best regards
A. Hi Ivan,
If this is on your customer drawing your best bet is to ask your customer what it means.
Never ceases to amaze me, how were you ever able to quote for the job if you didn't understand what it entailed?
A. Hi Sugumaran. I am not able to find a "DIN 50691" spec. and suspect a typo, and that that you actually meant DIN 50961, superceded by DIN 50962 . That spec and ASTM B633 are different specs, so they are not "equal" -- but I believe it will be possible for your plating to comply with both of them. Good luck.Regards,
Q. I'm finding global specification callout comply with PFZn8-C. I'm not sure where this callout comes from. I guess it's the same with Fe/Zn8/CM2. Am I correct? Then can I use ISO callout ISO 2081 Fe/Zn8/C?One more thing: Is there any expression which regulates trivalent passive chromate?
Sorry for many ugly questions ...
Q. Hello,
I received a Salt Spray Corrosion Test Tracking. The treatment for the product is Ep-Fe/Zn5 C3 which I know coating thickness is over 5 m. What coating requirement color should it be? It says "BLUE" but I thought it was green finish. Do they make a mistake or is that correct?
Thanks in advance!
Q. I just received some parts with this specification UNI ISO 2081, Fe/Zn 12c 2C. I have copy of specification but I don't understand the 2 in front of the C. I understand that the C is or iridescent coating but I'm wondering if the 2 has something to do with trivalent/hexavalent type. Also the 12 I am assuming is for 12 micrometers, but what is the little c for?
Thanks in advanced for all the responses.
Q. Hi, I work for a valve manufacturing company. One of our customers gave us a plating specification saying:
Surface protection "FeZn 8 Cr III Y SS:8451 S2"
Now, although I have been reading these threads and have found out that FeZn8 probably means Zinc plating with 8 microns thickness, I am not able to find Cr III anywhere. It probably means Chrome passivation but what does III mean.
Also, does SS 7451^8451 S2 mean salt spray test for moderate conditions (S2)?
Please help.
Q. We have inquiry for zinc plating electrodeposited coating ISO 2081 -Fe/Zn8/T4-trivalent clear passivate and torque and tension top coat TnT 15 to meet NSS hours of 120 hours white/384 Red corrosion. What does T4 mean? Thank you.
Q. We are quoting a electroplate spec and want to better understand the "breakdown" of the spec. Ep-Fe/Zn5/CM2C
Fe : substrate to be plated
Zn : kind of plating
5 : thickness (8 ^5CM1 : blue chromate
CM2 : yellow chromate
C: ? Does anyone know what the C means?
A. Hi Omar. When we receive postings from other countries, we often must start by fixing symbols which come across wrong because of keyboards differences, letters that don't exist in English, accent marks, etc. Your name and town came across as: . On postings from some countries we must change " " to " I ", etc. Yet people quote abbreviations without saying what specification they are from, and ask what was meant. Spec writers don't swear an oath what their terms will mean. It's dangerous -- we have several threads where people misinterpreted what was intended by "Type 3" in regard to aluminum processing :-(You say the "5" means "8 microns" -- it's possible, but says who? I think it 'ought' to mean 5 microns. Please tell us what specification you are referring to, then all can be revealed. Thanks!Regards,
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