Thought TiNi couldn't rust?

David Bowen · **on:** January 21, 2010, 05:48:15 PM

A while back a got a TiNi PPP from one of the members here on the forum, it really doesn't do anything for the tool but give it a cool factor. I own a PPPD as well, both get used about the same but when looking at the PPP today I get a surprise. It seems to have little spots of rust, they wouldn't simply wipe off or rub off and I had to take a fine brillo pad to remove them. Question is, how it the world did TiNi which is suppose to be for corrosion resistance get rust on it? TiNi has an hardness of like 90 or something right? This stuff is suppose to be awesome when it comes to protecting something. Furthermore the PPPD has no signs like the coated one does, this is really really strange. I tell you guys all the time I have toxic sweat or oils in my skin that steel just simply hates but no one wants to believe me.

Medic82 · **Reply #1 on:** January 21, 2010, 05:53:29 PM

I have never seen that before.......weird

AHB · **Reply #2 on:** January 21, 2010, 05:56:18 PM

Poor thing getting all that toxic sweat, and all.. $:-\$ You better send it to me right away and I'll take good care of it..

But yes, it does sound weird..

David Bowen · **Reply #3 on:** January 21, 2010, 05:58:03 PM

Yea, I know when it's stainless or god forbid CARBON steel, I keep a close eye on them (even s30v) but this is a first for something ment to keep corrosion at bay. I thought I could abuse this tool somewhat and not baby the outside by maintenance, boy am I wrong. Guess the TiNi PPP is just another pretty face, or beauty is only skin deep

Spoonrobot · **Reply #4 on:** January 21, 2010, 07:46:05 PM

The reaction takes place under the coating. This picture from Benner shows the same thing on a BC/BK coated Benchmade. Note that the corrosion comes out in bubbles under the coating, this is from the relative thickness of that type of coating and the fact that it sits on the surface like paint.

I've also had similar experiences with DLC coatings, the rust doesn't bubble up like above but it does seem to appear "in" the coating. I'm curious as to what mechanism caused the corrosion. Is it just a function of the coating or was there a problem in the production or finishing? Maybe micro-abrasions allowed moisture to enter?

Like stainless steels, it appears TiNi is corrosion-resistant and not corrosion-proof.

Benner · **Reply #5 on:** January 21, 2010, 07:54:51 PM

OT I am really tempted to remove all that coating.

Spoonrobot · **Reply #6 on:** January 21, 2010, 08:01:54 PM

I like it. It looks nice and worn in.

Benner · **Reply #7 on:** January 21, 2010, 08:04:15 PM

Quote from: Spoonrobot on January 21, 2010, 08:01:54 PM

I like it. It looks nice and worn in.

I kinda do as well, but I am still tempted by a pristine blade...

AHB · **Reply #8 on:** January 21, 2010, 08:10:55 PM

Quote from: Benner on January 21, 2010, 08:04:15 PM

I kinda do as well, but I am still tempted by a pristine blade...

Don't.....

Benner · **Reply #9 on:** January 21, 2010, 08:11:40 PM

Guess I'll be leaving it as it is then.

Freudian Frog · **Reply #10 on:** January 21, 2010, 08:11:48 PM

Quote from: AHB on January 21, 2010, 08:10:55 PM

Quote from: Benner on January 21, 2010, 08:04:15 PM

I kinda do as well, but I am still tempted by a pristine blade...
Don't.....

Do it! DO IT!!

AHB · **Reply #11 on:** January 21, 2010, 08:14:41 PM

Quote from: Benner on January 21, 2010, 08:11:40 PM

Guess I'll be leaving it as it is then.

Thanks...

David Bowen · **Reply #12 on:** January 21, 2010, 09:16:19 PM

On the surface, after I removed said rust all looks fine again. Really wierd, it was not bubbled from within nor did I see any damage after I removed it. I will be sure to keep and eye on this and maybe get in tough with Chris@SOG and see what he can tell me about their coating.

AHB · **Reply #13 on:** January 21, 2010, 09:20:45 PM

Quote from: David Bowen on January 21, 2010, 09:16:19 PM

On the surface, after I removed said rust all looks fine again. Really wierd, it was not bubbled from within nor did I see any damage after I removed it. I will be sure to keep and eye on this and maybe get in tough with Chris@SOG and see what he can tell me about their coating.

Dang..

It won't be in the mail then..?

Glad it's all good and I would like to hear their answer..

David Bowen · **Reply #14 on:** January 21, 2010, 09:58:15 PM

I'll be sure to put you in my will

AHB · **Reply #15 on:** January 21, 2010, 10:02:41 PM

Quote from: David Bowen on January 21, 2010, 09:58:15 PM

I'll be sure to put you in my will

That'll do..

Freudian Frog · **Reply #16 on:** January 21, 2010, 10:08:03 PM

Quote from: AHB on January 21, 2010, 10:02:41 PM

Quote from: David Bowen on January 21, 2010, 09:58:15 PM
I'll be sure to put you in my will
That'll do..

I could cause on "accident"... for the right price.

AHB · **Reply #17 on:** January 21, 2010, 10:59:09 PM

Quote from: Freudian Frog on January 21, 2010, 10:08:03 PM

Quote from: AHB on January 21, 2010, 10:02:41 PM
Quote from: David Bowen on January 21, 2010, 09:58:15 PM
I'll be sure to put you in my will
That'll do..

I could cause on "accident"... for the right price.

PM sent..

BlueDot · **Reply #18 on:** February 23, 2010, 03:50:21 AM

Just throwing this out there:

Chrome plate is actually porous, and over time, corrosion will get through these micro pores and look bad.

Is it possible that the Titanium Nitride coating was poorly applied- like not completely cleaned first? Any contamination under the coating could fester and erupt. Kind of like microscopic zits.

J-sews · **Reply #19 on:** February 23, 2010, 03:55:33 AM

Quote from: BlueDot on February 23, 2010, 03:50:21 AM

Just throwing this out there:

Chrome plate is actually porous, and over time, corrosion will get through these micro pores and look bad.

Is it possible that the Titanium Nitride coating was poorly applied- like not completely cleaned first? Any contamination under the coating could fester and erupt. Kind of like microscopic zits.

I wonder if that's it. $:-\$ Good theory BlueDot

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Thought TiNi couldn't rust?

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