I reckon that some mineral oils seem to be very bullheaded. We had let parts pass aceton and etanol and some other cleanings, and to our surprise, after electron beam vacuum welding the two (cleaned)parts together, small and yellowish fatty things appeared on the liquid surface when the finished part was recleaned after the welding. This was done by dipping the flasklike part in a degreasing tank. Evidently, mineral oil was still hidden in the titanium surface after machining, despite it looked clean and left no debris when you rubbed with a white cloth. In a high magnification microscope you can see a lot of microscopic damages, void or what to call the rude surface. Just unlike steel and other metals. Whatever machining parameters or tools, it seeems as titanium is "squamous" after the drilling, milling etc.
TRI...hmm...was cast out here twenty years ago...chemo textile cleaning is allowed to be done with perchloroethylene, which I find remarkable. The later is not better in a environmental point of view.
Inge
PS. VIGON 200 = 11-12 (pH)
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: måndag 30 mars 2009 13:04
To: [log in to unmask]
Subject: Re: [TN] Titanium
I'm not sure that Vigon will be satisfactory for removing mineral oil residues and their additives, as these will not saponify in the amines.
You will need something with the pH exceeding 12-13 and with stronger tensio-active components.
I'll shock you by suggesting a trichloroethylene blend in a zero-emissions cleaning machine with a vapour phase final. I don't care what people say, it is a damned good low-cost solvent, used sensibly it is perfectly safe, it is non-carcinogenic to humans (it is carcinogenic to rodents in high doses, but their metabolism of the substance is
different) AND IT WORKS!!! (If needed, I have details of epidemiological studies with cohorts of tens of thousands supporting my statements.)
In the unlikely event that this alone would be insufficient for your needs, then consider an aqueous solution, depending on the residue analysis after TCE.
Brian
This alone would probably be sufficient and low-cost
Hernefjord Ingemar wrote:
> The tests will show. If one or two steps can be left, of course very good. On the other hand, the cost for these units is so high, that some dollars saving is negligible. Unlike the normal production when cents are hunted for.
>
> The alcaline bath will possibly be superseded by our Vigon 200 tunnel cleaner.
> /Inge
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of R Sedlak
> Sent: måndag 30 mars 2009 11:28
> To: [log in to unmask]
> Subject: Re: [TN] Titanium
>
> Ingmar:
> The process you suggest probably will work, but I suspect it is overkill. I suspect that the alkaline cleaner will be enough on its own.
>
> Good luck.
> Rudy Sedlak
>
> --- On Sun, 3/29/09, Hernefjord Ingemar <[log in to unmask]> wrote:
>
> From: Hernefjord Ingemar <[log in to unmask]>
> Subject: Re: [TN] Titanium
> To: [log in to unmask]
> Date: Sunday, March 29, 2009, 11:58 PM
>
> Thank you, Rudy&Steve.
>
> It seems as a suitable treatment would be this one:
> a)Solvent degrease, followed by
> b)Alcaline bath, followed by
> c)DI ultrasonic bath, followed by
> d)Micropowder blast, followed by
> e)HNO3 dip, followed by
> f)DI ultrasonic bath.
>
> We will try this today already. We do not like HF, so that kind of process is skipped. Our problem is not primarily to remove the oxide, but to ascertain that all threading/cutting oil is gone, also that the numerous micro pores are emptied from their content.
>
> /Inge
>
>
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of R Sedlak
> Sent: lördag 28 mars 2009 20:19
> To: [log in to unmask]
> Subject: Re: [TN] Titanium
>
> Although Titanium lightly alloyed is used in some joint replacements, it may well be more commonly known for its use as Nitinol, a Nickel/Titanium alloy, which has weird "memory" properties. Nitinol is one of the more common stent materials.
>
> Cleaning Titanium is quite difficult, particularly if it is heavily oxidized, as the common "cleaning" agent, (Hydrofluoric Acid) attacks Titanium vigorously, and then to frost the cake, this causes Hydrogen embrittlement.
>
> Not everyone/everywhere is as "enlightened" as we like to think we are, and yes, there is still choro-ethanes still in use in cleaning (Think "dry cleaning" clothes).
>
> There are proprietary cleaners which purport to get around these issues. If interested, contact me off Technet.
>
> Rudy Sedlak
> RD Chemical Company
>
>
>
>
>
>
>
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