- Joined
- Apr 7, 1999
- Messages
- 514
Before: http://albums.photopoint.com/j/View?u=138168&a=1012456&p=17232244&Sequence=0
After: http://albums.photopoint.com/j/View?u=138168&a=1012456&p=19486716&Sequence=0 http://albums.photopoint.com/j/View?u=138168&a=1012456&p=19486718&Sequence=0
Some may recall my broken mini pentagon. I snaped the tip after stabbing a piece of wood. However bad that may be, I took the oportunity to test the rust resistance of the steel, and I am impressed with the results so far. Seeing as how this is the same coated 440a used on the Seal knives some of you may find the results reassuring. The blade was left in a large cup of water for five days. I do not have Mass Spec data, or electrolite info, or the acidity of the water I used, but if the dorm's toliet pipes are any indicator, this water rusts things fast. However as you can see from the scans there is virutally no rust at all on the blade. The black box circles the only tint of rust on one of the serrations, but other than that the knife is completely rust free after 120 hours in a tap water submersion. I will next add enough salt to saturate the water, and retest the blade to simulate corrosive conditions worse than, or at least equal to ocean water. I am not sure about the exact chemistry behind rust formation, but I have a hunch rust would form faster if the blade was exposed to higher levels of oxygen like for example if it were left in a damp leather sheath rather than submerged under water. Anyway, I will post the salt water tests in five days.
[This message has been edited by generallobster (edited 04-13-2000).]
After: http://albums.photopoint.com/j/View?u=138168&a=1012456&p=19486716&Sequence=0 http://albums.photopoint.com/j/View?u=138168&a=1012456&p=19486718&Sequence=0
Some may recall my broken mini pentagon. I snaped the tip after stabbing a piece of wood. However bad that may be, I took the oportunity to test the rust resistance of the steel, and I am impressed with the results so far. Seeing as how this is the same coated 440a used on the Seal knives some of you may find the results reassuring. The blade was left in a large cup of water for five days. I do not have Mass Spec data, or electrolite info, or the acidity of the water I used, but if the dorm's toliet pipes are any indicator, this water rusts things fast. However as you can see from the scans there is virutally no rust at all on the blade. The black box circles the only tint of rust on one of the serrations, but other than that the knife is completely rust free after 120 hours in a tap water submersion. I will next add enough salt to saturate the water, and retest the blade to simulate corrosive conditions worse than, or at least equal to ocean water. I am not sure about the exact chemistry behind rust formation, but I have a hunch rust would form faster if the blade was exposed to higher levels of oxygen like for example if it were left in a damp leather sheath rather than submerged under water. Anyway, I will post the salt water tests in five days.
[This message has been edited by generallobster (edited 04-13-2000).]
