Re: Difference between Nickel Sulphate, Nickel Chloride, Nickel Sulfamate, Nickel Bromide [ Started by blurguy in Electroplating : 3 replies ]

My understanding is that Ni sulfamate gives a much lower stress deposit than Ni sulfate; hence its use in electroforming applications. High chlorides do indeed lead to bad ductility - platers that I knew that were very rigorous about controlling Cl (not using HCl for pH adjustments, watching drag-in from HCl pickle rinses/baths) had far better deposit stress.

[url=]Dedalus Environmental - The On-Site Treatment Specialists[/url]

[i]Waste treatment help with a production oriented outlook.[/i]

Re: electro galavanizing vs hot dip ???? [ Started by dalei989 in Electroplating : 1 replies ]

"Electrogalvanizing" [b]is[/b] zinc plating. I am not what you would call a "car guy", but isn't there some original specification from when cars of that vintage were made? There is likely some kind of ASTM code number in it that will tell you the thickness of zinc that they required to be applied on that type of part, and the chromate coating (that's almost always put over zinc plate) that was specified.

Or, you could just "wing it", and take it to that plating shop you found, and have them put a good thick layer of electroplated zinc on your parts, with a gold chromate on top.

A (hopefully inoffensive) word about plating shops: many are a bit leery of taking "special" jobs from members of the general public. It has happened in my career as a chemist that some people who are not very educated about metal finishing are not altogether certain what they want, and I wound up doing a lot of work on something, and having to refund their money and see them go away grumbling.

Also, …

Re: Metal Recovery Technology [ Started by zoulume in Waste Water Treatment : 2 replies ]

[quote=Southern Metal Finishing;1178]When is it feasible to use this electro-winning technology and when is it not? What factors do you consider when answering this question?[/quote]

It looks like a hot little system. They have a pilot scale reactor that they use to evaluate waste samples experimentally before installing their equipment, which is a good thing. The main downside of it would seem to be cost. It might be best for a well capitalized maker of high end goods, that has just one or two significant waste stream metals.

A job shop, with multiple small tanks and 12 - 15 waste streams, might have a tough time making cost effective use of this device. I'd be interested to see if they sold the electrolytic cell separately, without rectifier, filter unit, or process controller.

[url=]Dedalus Environmental - The On-Site Treatment Specialists[/url]

Re: Free trade? Let's call a spade a spade. [ Started by Brian Sullivan in Manufacturing : 3 replies ]

I suppose people will sit up and take notice when some toddler finally succumbs to lead poisoning, or an airplane falls out of the sky because some mission critical part was stamped 'approved' when it should not have been.

As Poor Richard commented, "Experience is a dear school, but a fool will learn in no other."

[url=]Dedalus Environmental - The On-Site Treatment Specialists[/url]

Re: Store-bought or home-brew solution to color steel black? [ Started by Tuco in General Discussion : 2 replies ]

Sure. There's two I know of. There's Birchwood-Casey Presto Black, an acidic solution containing copper and selenium, that colors steel black at room temperature. The only requirement is that the metal be absolutely clean.

The other is Jet-Kote 54, a product my company used to make when we were based in California. Its chemistry is similar, but it's not a reverse engineered knockoff, it's something I invented. I'm trying to get a production facility going here in New York, but that may take a bit more time.

There are public domain formulas (I started with one) but the one I used was powdery and rubbed off easily - it needed to be jazzed up with some other chemistry before it worked well enough to satisfy me.

Do be advised, though: these cold blacks are purely cosmetic. They confer no corrosion resistance at all. And, though they will stand up to some mild rubbing, serious abrasion, like "scratching" will take them right off. You'd need to top off with some kind of lacquer or  …

Re: Basics of Electroplating [ Started by david french in Electroplating : 7 replies ]

Trivalent chrome plating - for the latest, try contacting one of the vendors.

MacDermid has these:

[url=]MacDermid Industrial Solutions[/url]

My personal knowledge of this process is a few years old. The system I saw required multiple additives, and a separate anolyte segregated from the rest of the bath by an ion selective membrane. There were also issues with the color not matching that obtainable from traditional hex chrome solutions, a critical matter in decorative automotive applications.

However, Science marches on :D and some or all of these problems may have been solved.

[url=]Dedalus Environmental - The On-Site Treatment Specialists[/url]

Re: Purpose of a sealer in pre treat [ Started by marty in General Discussion : 4 replies ]

Yes, absolutely, if I understand the process properly.

Sealers are frequently used atop non-chromated conversion coatings to enhance salt spray resistance. They're generally silicate based aqueous solutions that form, on drying, a "glassy" topcoat. Without this, your phosphate coating would be a lot more liable to attack.

[url=]Dedalus Environmental - The On-Site Treatment Specialists[/url]

Re: Make 'em say "Wow!" [ Started by Southern Metal Finishing in Metal Finishing Associations : 14 replies ]

Here's a funny experience.

I used to have all kinds of plating solutions around, and I'd plate my keys with them, partly for fun, and partly to make them easier to tell them apart. I was on the BART train (this was in Oakland, CA) and I was sitting next to this nice young lady, about 8, and her mom. I happened to take out my keys, she saw them, and said, "What's that?"

So, I explained to her and her mom a little about electroplating, let her look at the keys, and wound up by saying, 'study hard, and a smart little girl like you can learn how to do it, too!"

They could not have been more charmed.

Then, I turn around...and one of these peace-love-macrobiotic granola types they have out in the SF Bay area is giving me this [i]incredibly dirty look.[/i] As if I'd been indoctrinating her in some evil art. I was really too taken aback by this to say a word...but, what, lady? you'd prefer that, when she grew up, she'd be hanging out on Telegraph Avenue panhandling like your pals? …

Re: Department of Homeland Security Releases Appendix A List of Chemicals [ Started by Southern Metal Finishing in Industry News : 1 replies ]

When I did process control for an anodizing facility, I'd analyze their Ni/Co bearing seal solution on a regular basis. The analytical procedure used triethanolamine to prevent dissolved Al from titrating along with the transition metals. I had a bottle of it for years; thought of it as being pretty harmless.

It is, however, in the "any quantity" reporting category, because it can be used to manufacture nitrogen mustards, potent chemical weapons. Before filling out that paperwork, people might want to have a look in the lab's chemical cabinet.

It, itself has no hazardous properties, and if I still had this stuff around, I'd just flush it down into the waste system clear well and get rid of it.

Re: The Chinese Pollution Monster [ Started by Dedalus in Manufacturing : 15 replies ]

Numerous citizens have spoken out about it, trying to have something done, only to be arrested and imprisoned for "counterrevolutionary activities" or some such 1984ish sounding offense.

There are [i]some[/i] concerned people in their government, but they're not getting much traction in the circles of power.

Re: Electrical Outlets [ Started by eboireau in General Discussion : 3 replies ]

I'll just throw this funny little idea out there...

You know those outlets they have in motel bathrooms, with the breaker mounted right inside the recepticle? Perhaps something like that.

Re: websites [ Started by eboireau in General Discussion : 3 replies ]

[quote=eboireau;994]nice. I like the bubbly beaker[/quote]

I lifted that, with the permission of the 'liftee' =
[url=]Science made alive[/url]

Fascinating gentleman, he's Dutch, I believe. Apparently, he's a software guy who just loves chemistry as a hobby.

Re: websites [ Started by eboireau in General Discussion : 3 replies ]

[quote=eboireau;992]Hey everyone,

Its been a hectic summer, my receving area is stacked to the ceiling with jobs and i havnt had much time to cause trouble here.

I wanted to get some thoughts on websites, and designs/layouts that some of you are using. I think im going to try to ramp up one for my company in the near future.

I hope everyone is doing good.

Eric Boireau
H. LaRosee & Sons, Inc.[/quote]

It's not hard to write a 'plain vanilla' webpage. I highly recommend Elizabeth Castro's HTML books.

Possibly, the easiest thing to do is to use someone else's page as a template. Though no one would ever confuse me with a professional web designer, you're welcome to use mine. It's built around a simple square table...take a look.

[url=]Dedalus Environmental - The On-Site Treatment Specialists[/url]

Good luck! It's really not hard, I encourage everyone to learn a little HTML and have their own page. …

Re: pH/ORP maintenance article [ Started by Dedalus in Waste Water Treatment : 1 replies ]

Perhaps some people might find this article I wrote a couple years ago informative.

[url=]Metal Finishing[/url]

[url=]Dedalus Environmental - The On-Site Treatment Specialists[/url]

Re: The Chinese Pollution Monster [ Started by Dedalus in Manufacturing : 15 replies ]

It is no joke. And, the particulate matter and sulfur dioxide they're pouring into the atmosphere winds up partially in the air [b]we[/b] breathe.


Re: Competing Equilibria [ Started by Dedalus in Waste Water Treatment : 0 replies ]

Ni 2+(H2O) 6 + 6 NH3 <-> Ni2+ (NH3) 6 + 6 H2O


Ni 2+ + S2- <-> NiS

The coordination number of the Ni may be less, owing to steric effects, Jahn-Teller effect, etc.

Both this element, and copper form very strong ammonia complexes. The pH affects, largely, this equilibrium:

NH4+ <-> H+ + NH3

The higher the pH, the higher the free ammonia concentration. And, the more sulfide, DTC, TMT; what have you, will be required to drop the Cu and/or Ni. And, inevitably, the more coagulants and other sludge generating crapola you will have to add to get a settlable solid.

Frequently, rather than adding more precipitant, one should finesse the precipitation pH, not neglecting that many of these precipitants (esp. Na2S) are significantly alkaline and affect the pH themselves.

Attention to this can save you lots of $, by avoiding the generation of unnecessary sludge.

[url=]Dedalus Environmental - The On-Site Treatment Specialists[/url] …

Re: Alkaline Zinc-Nickel Plating [ Started by Dedalus in Electroplating : 2 replies ]


Sorry, but, once more, anyone out there running this process?

Once upon a time, I ran a high volume double barrel line, McGean-Rohco Ecolozinc. Alkaline, non-cyanide. After some initial nightmarish start-up problems, it ran like a top. The key was [i]lots[/i] of Hull Cell testing combined with vigilant and constant inspection of the work coming off the line.

I'm doing some research on Atotech's Reflectalloy ZNA bath, and it sounds similar. There's the additional complication of what seem to be (to me, anyway) separate carriers for the Zn and the Ni. Though in a fresh make-up, the Ni constitutes 8.5% of the metal in solution, it makes up 12 - 15% of the electrodeposit. That is, if you do it right.

It seems to be the consensus that you need an XRF machine to monitor the deposit ratio, which is critical to getting the pure gamma phase Zn-Ni alloy. Perhaps, this is so; but I have a hard time seeing why the same thing couldn't be accomplished by clipping a precisely measur …

Re: positive business outlook [ Started by Southern Metal Finishing in Manufacturing : 2 replies ]

That confirms my own personal impressions, and is good to hear.

Down comes the white flag of economic surrender, up goes the Jolly Roger of Free Enterprise, and it's about time.

Re: Eco-Efficiency in the Metal Finishing Industry [ Started by Finishing Talk in General Discussion : 2 replies ]

I experimented a lot with wastewater management when I was responsible for the wastewater treatment needs of a cyanide zinc/nickel plating jobshop, a few years back. Here's a few specific strategies I found to be winners.

1) Reuse treated water in less sensitive applications. I would frequently do chrome reduction/pH adjustment on chromating rinses, then allow the solids to settle with minimal or no flocculant addition for a day or so. Then, I'd pump the clarified decanr back up to the line and use it again as a electrocleaner rinse.

2) We emptied one of the rinse tanks following the cyanide zinc tanks and installed a spray rinse system, consisting of a high pressure pump fed from a DI tank that powered 12 spray rinse nozzles. The spent spray rinse got fed to an evaporator. We had plans that never materialized to feed it to an electrolytic recovery unit. But, then, Zn was 65 cents a pound. Nowadays, we would have been motivated to make it happen.

An important thing, if you do  …

Re: Jar Test Procedures for Precipitants, Coagulants, and Flocculants [ Started by Finishing Talk in Waste Water Treatment : 3 replies ]

That's a good and informative piece.

There is also TMT-15, a product manufactured by Degussa. It has the advantage that, unlike dimethyl dithio carbamate or thiocarbonate, it will not break down to yield carbon disulfide.

Your advice to provide ample ventilation when using DTC or thiocarbonate is well taken. Carbon disulfide is just as flammable as diethyl ether. There have been incidents where it, in the vapor phase, has ignited.

[url=]Dedalus Environmental - The On-Site Treatment Specialists[/url]

Re: Starting in plating [ Started by bandit-kustoms in Electroplating : 8 replies ]

Thanks also for your infos. The waste disposal seems quite something! Before going any further in this project, I need to get some informations on local regulations and waste disposal procedures.[/quote]

The waste disposal is the easy part.

Copper Strike rinse: Adjust the pH to 10.5 to 11 if necessary. Get some KI/starch test papers. Add bleach until you get a positive reaction. Stir it for one hour, making sure that the paper reaction stays positive for the whole hour. This should take care of the cyanide.

Important! Keep iron and iron bearing stuff (ie, "dragin" from the acid pickle tank that comes before the copper strike) OUT of the copper strike. Iron + cyanide = bad news; waste that can be very hard to treat.

Nickel Tank rinse: Add a little ferrous sulfate...about 1/4 lb per 500 gallons of rinse. Make sure it's dissolved. Add lime to about pH 8, then bring the pH to 10-10.5 with caustic soda.

Chrome rinse: Dip some acid out of y …

Re: Starting in plating [ Started by bandit-kustoms in Electroplating : 8 replies ]

In your application, you should look at conforming anodes.

Hexavalent chromium plating has about the worst "throw" of any common plating process. "Throw", as you likely know already, is the property of a plating system to get the plating into low current density areas. Conforming anodes, made of the same antimonial lead that make up the standard anodes in a chrome tank could be either purchased, or fabricated. You could have them for each of the parts you manufacture, at least the ones where you do the most volume.

Expenditures in this direction will bear rich fruits, both in decreased plating time, and reduction in the amount of post plate polishing required.

[url=]Dedalus Environmental - The On-Site Treatment Specialists[/url]

Re: I need a gig. [ Started by Dedalus in Job Opportunities : 0 replies ]

Part time, or on a contract basis.

I'd be especially interested in getting with someone who's looking to set up a zinc/nickel alloy plating line. This is a great technology - better NSS resistance than cad, without the toxicity of Cd. They say you need an AA to monitor the Ni concentration of the bath, and X-ray fluoresence to monitor the Zn/Ni ratio in the deposit.

Watch me do both those things with wet methods. All I need is a couple of chemicals and a filter photometer to run those things colorimetrically. The key to success is daily Hull Cell testing, like with alkaline zinc baths. Those, I know; but the rewards with this process put plain vanilla Zn plating in the shade.

I'll work for coffee and cakes, but when the profits start rolling in, I want a slice.

[url=]Dedalus Environmental - The On-Site Treatment Specialists[/url]

Re: electroplating on aluminum [ Started by juandajdj in Electroplating : 6 replies ]

The problem with using Al in the application you speak of is that there's a fair amount of abrasion in service, what with anode baskets being shifted, work being racked, etc. Since the substrate Al is fairly soft, any coating you put on it is liable to crack, exposing the Al to whatever corrosive mist/fume/vapor that's coming off the bath. Now, it creeps in through that crack, undermines whatever plating you put on the busbar, it peels off like gangbusters, and you have a mess.

Copper is much less chemically active. Easier to plate, too. Hit it with a good, thick, low stress nickel coating, like you get from a well maintained sulfamate bath. Then, tin on top. It's soft, it will make good contact...when you start seeing bare nickel, re-tin the busbars.

Re: Heavy Metals Precipitation question [ Started by Ryan Cook in Waste Water Treatment : 3 replies ]

Another alternative, if it fits in with your process, is to employ a low volume spray rinse. The flowing rinses that follow with be much less loaded, and the time between regen. cycles in any IX system greatly lengthened.

Spent regen. gets mixed with the spent spray rinse, and you recirculate it through a "Retec" unit, or something comparable. You then get a salable by product instead of F006 sludge.

It may not be necessary to even use a polishing step on the effluent water after the loading is decreased that much. If one is still needed, I talk about precipitants on my webpage, here. [url=]Chelated Metals Wastewater Treatment Page[/url]
There are three alternates I cover, with their advantages and disadvantages.