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March 2009

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Subject:
From:
Paul Edwards <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Paul Edwards <[log in to unmask]>
Date:
Mon, 30 Mar 2009 10:24:15 -0700
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Inge,

You may want to add a bead blast between a) and b) to open up the sheared metal covered pores.  A vapor honing process may be better than the Micropowder blast in d)... We used a 4%HF/HNO3 soak to clean Ti and S/S micropores, with a very hot DI water rinse afterward.... Oh handle with clean gloves until coated or packaged...Some time non-TFE plastics or any non-absorbing surface reacted with Ti until fully passivated... 

Paul

Paul Edwards
Surface Art Engineering

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar
Sent: Sunday, March 29, 2009 11:58 PM
To: [log in to unmask]
Subject: Re: [TN] Titanium

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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