How corrosion resistant are the Titanium knife and line cutter blades?

[RedSeaDiver2]

Does anyone have any information / experience on how corrosion-resistant the titanium is on the commonly sold dive knives and mini line cutters? Any corrosion will depend on how how good the grade of titanium being used is - but I don't know how good the stuff is that they are using for dive knives and the mini line cutters.

 

[Johnoly]

Does anyone have any information / experience on how corrosion-resistant the titanium is on the commonly sold dive knives

A picture is worth a thousand words. This is my 12 yr old with 1100+ SALT WATER dives on it and the plastic is all scratched up. Although my BPW gets soaked after each day, I never take it out of the holder nor wipe the blade, nor any special drying. I just abuse the crud out of it and fully mis-treat it. I like titanium dive gear !!

 

[RedSeaDiver2]

A picture is worth a thousand words. This is my 12 yr old with 1100+ SALT WATER dives on it and the plastic is all scratched up. Although my BPW gets soaked after each day, I never take it out of the holder nor wipe the blade, nor any special drying. I just abuse the crud out of it and fully mis-treat it. I like titanium dive gear !!

View attachment 900037

That's all the evidence that I need! Many thanks!

 

[arkstorm]

Titanium does not "corrode" in the same sense as steel. As soon as titanium is exposed to air and moisture it immediately forms an oxide film on its surface which protects the metal from degrading. If the oxide film is scratched off, it reforms almost immediately. Thus, "corrosion" actually protects titanium. I believe the technical term is that the oxide layer that forms when titanium corrodes "passivates" the metal.

That having been said, titanium doesn't hold an edge as well as steel so be aware that if you use it in a knife or line cutter you will need to sharpen it frequently.

 

[OTF]

There are also line cutters with ceramic blades which are brittle but don't corrode. I think Piranha sells them.