Spyderco Persistence Blade chemistery

T

tomm9050

Joined
Aug 14, 2011
Messages
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I used my knife to open a back of swimming pool chlorine and noticed a few hours later that the blade had
brown stains on it. Is this normal and is there any remedy?
 
Considering that prolonged contact with swimming pool chlorine tablets has corroded even H-1, I'd say the future solution is to clean your knife thoroughly after contact with corrosive chemicals. If you are asking how to remove the stains you have from not doing so, I suggest Flitz or similar metal polish and patience.
 
Yes it is normal. Chlorines attack "stainless" steels. There is nothing you can do about it but polishing it of.
 
Post up some photos of your Persistence showing the brown stains. I EDC a Persistence and after bead blasting the liners and blade I've now been looking at doing some patina on it...
 
this was really brief exposure to the powdered chlorine. Just opening the bag. What's odd is I never had this issue with my Buck 055 EDC.
 
tomm9050 said:
this was really brief exposure to the powdered chlorine. Just opening the bag. What's odd is I never had this issue with my Buck 055 EDC.
Click to expand...

If you did not wash the blade thoroughly after opening the bag, powdered chlorine could have stuck to the blade pretty easily, especially if there were any skin oils (fingerprints and such) already on the blade. In my experience, the 8Cr13MoV used in the Byrd knives and Tenacious line is not as corrosion resistant as the 420HC Buck uses. I had some surface rust form on a G-10 Crossbill that escaped from my pocket in my girlfriend's back yard and hid in the weeds for a couple of months.
 
Pure chlorine like that is probably the most aggressive corrosive substance to stainless steel you'll ever run into outside of a laboratory. Given enough time even H1 which is pretty much the single most rustproof steel you can put on a knife will corrode in contact with it. 420HC is one of the more corrosion resistant stainless steels, the stuff in the persistence is similarish to 440c or aus8, not as corrosion resistant but much better wear resistance.
 
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