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KevinBond
04-17-2008, 20:01
My dive knife has only been on a few dives ive washed it after every dive and it is supose to be titanium coated yet it continues to rust any ideas on how i can stop this ????
:smiley21:

ScubaToys Larry
04-17-2008, 20:05
Titanium coated?? Which knife? Which brand and model?

Splitlip
04-17-2008, 20:15
yeah.

It s either titanium or it is not.
Never seen titanium rust.

FishFood
04-17-2008, 20:22
Hehe. Advertising Scam?

Either way, let it soak overnight in Louisiana Hot Sauce. The next morning attack it will either an SOS pad, or some steel wool. Once the rust is gone coat it will some 3in1 oil (or atelast rinse and dry after every dive)

Splitlip
04-17-2008, 20:25
Crystal? OK?

I have been using Coke Classic.

Doug B
04-17-2008, 20:38
My dive knife has only been on a few dives ive washed it after every dive and it is supose to be titanium coated yet it continues to rust any ideas on how i can stop this ????
:smiley21:

Titanium coated? huh? Maybe TiN (Titanium Nitride) coated - like cutting tools? Is (was) the blade a gold color?

If it's rusty, then it's not Titanium. If it's TiN coated, it will rust. Even some steels that are classified as "stainless", like 13-8 stainless, will rust. I've not seen a corrosion problem with 17-4 stainless steel though....

KevinBond
04-18-2008, 03:09
Titanium coated?? Which knife? Which brand and model?


Cutterfish Stainless Steel Dive Knife


Free Hose Retainer - to mount your knife with sheath to any hose
Titanium coated finish
420 J2 stainless steel construction
Compact and light weight
Two depth compensating leg straps
Non-slip grip design
Quick Release Sheath
Line cutter
Serrated edges easily cut through kelp, rope, fishing line and other potential hazards

ScubaToys Larry
04-18-2008, 06:42
Well, being a 420 stainless... yes... that will rust. I'm not sure what the titanium coating is supposed to do - other than sound cool on a marketing standpoint.

420 is a very hard steel, but it rusts pretty easily (as you have seen) and the only thing to do is clean it after each dive, and then cover the blade with oil after cleaning.

300 series knives will not rust... they are the type of metal you have in your home silverware... your forks and spoons don't rust... but they are not that sturdy, and can bend easily. In a knife, that means it can dull rapidly as well... but no rust.

So then the only real way to have a non rusting and sharp knife is another alloy like titanium.

And while titanium is very expensive, there are some good deals to be found on titanium knives... Oceanic Titanium Knife, Dive Knives, Oceanic, Oceanic Titanium Knife (http://scubatoys.com/store/detail.asp?PRODUCT_ID=Oceanic_Titanium_Knife)

and UK has developed a new allow called Hydralloy and that is another knive that will hold a good edge and not rust Hydralloy Blue Tang Knife, Dive Knives, Underwater Kinetics, Hydralloy Blue Tang Knife (http://www.scubatoys.com/store/detail.asp?product_id=BlueTangH)

Scoobidoo
04-18-2008, 07:39
We have the UK Hydralloy, it's real good stuff! We rinse it after every use, but didn't baby it (oiling etc), it hasn't rust yet.

harb99
04-18-2008, 09:36
And while titanium is very expensive, there are some good deals to be found on titanium knives... Oceanic Titanium Knife, Dive Knives, Oceanic, Oceanic Titanium Knife (http://scubatoys.com/store/detail.asp?PRODUCT_ID=Oceanic_Titanium_Knife)

What is the blade length on this one? It does not say in the description.

No Misses
04-18-2008, 09:52
After loosing my 3rd Aeris silver Jack http://scubatoys.com/store/detail.asp?product_id=AerisSilverJack (http://scubatoys.com/store/detail.asp?product_id=AerisSilverJack)
I decided to try out the Scuba Max Titanium folding knife http://scubatoys.com/store/detail.asp?PRODUCT_ID=kn700Ti (http://scubatoys.com/store/detail.asp?PRODUCT_ID=kn700Ti)

This is my backup knife. I have it mounted on my waistband. I liked the silver jack since it required little to no maintenance. I would dunk my whole rig in fresh water at the end of the day. I did not take the knife out and rinse it separately. I have made a few dives with the scuba max. In a few weeks, I should have a good idea how well it holds up to neglect.

cummings66
04-18-2008, 15:12
The active ingredient in the soda that cleans rust is phosphoric acid. You can buy naval jelly at a hardware store if it's bad enough, it will remove the rust in the pits if it's that deep. If it's just surface rust clean it up with some gun oil and keep it oiled.

KevinBond
04-18-2008, 17:36
Well, being a 420 stainless... yes... that will rust. I'm not sure what the titanium coating is supposed to do - other than sound cool on a marketing standpoint.

420 is a very hard steel, but it rusts pretty easily (as you have seen) and the only thing to do is clean it after each dive, and then cover the blade with oil after cleaning.

300 series knives will not rust... they are the type of metal you have in your home silverware... your forks and spoons don't rust... but they are not that sturdy, and can bend easily. In a knife, that means it can dull rapidly as well... but no rust.

So then the only real way to have a non rusting and sharp knife is another alloy like titanium.

And while titanium is very expensive, there are some good deals to be found on titanium knives... Oceanic Titanium Knife, Dive Knives, Oceanic, Oceanic Titanium Knife (http://scubatoys.com/store/detail.asp?PRODUCT_ID=Oceanic_Titanium_Knife)

and UK has developed a new allow called Hydralloy and that is another knive that will hold a good edge and not rust Hydralloy Blue Tang Knife, Dive Knives, Underwater Kinetics, Hydralloy Blue Tang Knife (http://www.scubatoys.com/store/detail.asp?product_id=BlueTangH)




Well That sucks o well...what type of oil do i use? Is there a titanium knife that mounts to a hose?

ScubaToys Larry
04-18-2008, 17:51
Any knife mounts to a hose with a few zip ties!!

And for the oil... anything from wd-40, sewing machine oil... silicone grease will also work.

Sounder
04-18-2008, 17:57
zip ties and duct tape will fix anything! I've got both in my save a dive kit.

aiseson
06-26-2008, 12:17
also coat the blade in silicon or vasilene

ScubaToys Larry
06-26-2008, 12:38
And while titanium is very expensive, there are some good deals to be found on titanium knives... Oceanic Titanium Knife, Dive Knives, Oceanic, Oceanic Titanium Knife (http://scubatoys.com/store/detail.asp?PRODUCT_ID=Oceanic_Titanium_Knife)

What is the blade length on this one? It does not say in the description.

4.5 inches blade length with an over all length of about 9.5 inches.

Vercingetorix
06-26-2008, 13:05
I have the Fusiler Hydralloy knife (http://www.scubatoys.com/store/search_results_scuba_forum.asp?iLevel=1&txtsearchParamCat=ALL&txtsearchParamMan=ALL&txtsearchParamVen=ALL&txtsearchParamType=ALL&txtFromSearch=fromSearch&txtsearchParamTxt=fusiler&Search+ScubaToys=Search). I've been warned by others with the knife that they've experienced rust. So far, no rust for me. I've taken the knife apart to see if rust has crept in under the handle. Good price at $25

I have the blunt-tip; therefore, if I'm attacked by another diver in an underwater knife fight, I'll have to pry him to death.

CompuDude
06-26-2008, 14:25
The only true non-rust knives are those that are pure titanium (not Ti-coated, which merely delays the inevitable if on top of a metal that will otherwise rust) or those made from H1 metal, like the SpyderCo Salt series.

The titanium-coated knives tend to rust eventually, as the Ti coating wears down (assuming it was thick enough to properly prevent rust int he first place), particularly along the edge where it is completely removed at the first sharpening.

Karletto
06-27-2008, 15:14
rub the rust with sandpaper or even a grinder better; apply primary or something; visit a hardware shop thay sell different sorts of products against rust -> some of them u can apply directly on the rust

Jasper
06-27-2008, 15:38
My wife's UK Remora rusted after one pool session and a few fresh water dives. The knife has never seen salt water.

dive10killer
06-27-2008, 19:33
Creep works well on rusting knifes.

DallasMarineBio
06-27-2008, 20:08
This stuff works amazingly well on stainless, just rub the rust away:

Betco - SearchItemDetail (http://www.betco.com/SearchCenter/Pages/SearchItemDetail.aspx?ProdDispGrp=151)

Vercingetorix
07-01-2008, 11:09
Update: a couple days after my last dive, I found rust under the handle of the Fusilier knife. removed the rust with dry, green, scrubby thing, and coated the tang with "bear grease", kind of like axle grease.