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Corrosion testing

Discussion in 'Razor Edge Knives' started by razor-edge-knives, Aug 19, 2020.

  1. razor-edge-knives

    razor-edge-knives Moderator Moderator Knifemaker / Craftsman / Service Provider

    Apr 3, 2011
    So after getting a couple of the top contenders (as a benchmark) from this testing, I decided to do my own testing in a variety of conditions and ways. This will be ongoing testing over the coming months/years.

    I'm using some sample blades in 1095 steel that were sandblasted and degreased for maximum possible corrosion.

    [​IMG]

    The first 4 I'll be comparing are Hornady One Shot, WD40 specialist corrosion inhibitor, coconut oil (said to be the main ingredient in frog lube), and a control.

    After the oil application I wiped off all the excess with a dry paper towel. There is an interesting difference between the wd40 and one shot which I'll discuss later.

    Here are the 4 blades with the three lubed up - same order as in Pic above.

    [​IMG]

    I will be leaving outdoors and spraying once a day with a saltwater solution (4000 ppm salt content in water).

    First application has been started at about 2pm today. Updates will be coming soon!

    [​IMG]
     
  2. razor-edge-knives

    razor-edge-knives Moderator Moderator Knifemaker / Craftsman / Service Provider

    Apr 3, 2011
    Well... They had an initial salt solution spray and then a light rain, so a total of 6 hrs have passed... Coconut oil is already failing.

    [​IMG]
     
  3. razor-edge-knives

    razor-edge-knives Moderator Moderator Knifemaker / Craftsman / Service Provider

    Apr 3, 2011
    This is interesting... LCTI (WD40 Specialist Long Term Corrosion Inhibitor) is more of a spray on grease almost - you literally can't get it on thinner than this without wiping some off lol

    [​IMG]

    And here's the One Shot... it basically dries almost instantly leaving a MUCH less greasy feeling part

    [​IMG]

    But with both I still wiped off any and all excess for this test - the same I would on a normal knife blade :)
     
  4. ToddS

    ToddS Basic Member Basic Member

    390
    Jan 15, 2015
    Have you seen anybody test Fomblin/Krytox? Offhand I would have guessed it would be the top contender, but maybe too expensive for these applications.
     
    razor-edge-knives likes this.
  5. 3fifty7

    3fifty7 Gold Member Gold Member

    Dec 24, 2016
    Man o man, there are some great worm holes to go down on this !

    Add to the test:
    Weapon Shield
    Frog Lube
    CLP
    Tuff Cloth
    Eezox

    Can we do pivot lube resistance and wear next ?!?!?!
     
  6. razor-edge-knives

    razor-edge-knives Moderator Moderator Knifemaker / Craftsman / Service Provider

    Apr 3, 2011
    No I'm not familiar with those but I'll check them out... I do have a specific rust inhibitor oil I'll link to later that I'm gonna test out. It stinks to high heaven though lol

    Patience young grasshoppah... :) Yeah I have eezox and weapon shield on hand.
     
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  7. Fullflat

    Fullflat Gold Member Gold Member

    Jan 4, 2018
    Josh, have you considered trying mineral oil on one? I appreciate the fact that it’s one of the only truly food safe (IMO) options relative to what’s been listed, aside from the coconut oil, which obviously doesn’t cut it, according to some very straightforward pertinent experiment I just read about ;)
     
  8. razor-edge-knives

    razor-edge-knives Moderator Moderator Knifemaker / Craftsman / Service Provider

    Apr 3, 2011
    I'll give it a shot!
     
    Fullflat likes this.
  9. razor-edge-knives

    razor-edge-knives Moderator Moderator Knifemaker / Craftsman / Service Provider

    Apr 3, 2011
    do you have any specific recommendations from either company on what you suspect would work best?

    Just got off the phone with an engineer from Krytox about the XP-1A5 series oil. You were right this stuff is expensive!!! (about $300 for a pint) but it checks all the right boxes for me
    • food safe
    • high corrosion resistance
    • true water displacing (will sink to bottom of water)
    The only thing is that it's on the thicker side so we'll see. He said they don't normally send samples but he has some contacts to where the thinks he can work it out so I can try some out. Excited about that, thanks for the recommendation Todd!

    Regarding Krytox (who, interestingly enough had one of their first major sales for the first apollo space shuttle) vs Fomblin... I'll see if I can get this right lol, it was quite in depth. He was saying they both use PFPE (perfluoropolyether) but they use a different chain. Krytox uses a K fluid which is a branched and shielded molecule which apparently gives it better high temperature stability and more corrosion protection. Most of Fomblin's oil is made from a linear chain which has better cold temp stability and it lacks the proprietary corrosion inhibitor in it that Krytox develops and puts in their oils.

    Anyway, it will be interesting to check out if he can manage to get me a sample.
     
    Last edited: Aug 21, 2020
    Fullflat and 954Ink like this.
  10. ToddS

    ToddS Basic Member Basic Member

    390
    Jan 15, 2015
    I've not observed any difference between Fomblin and Krytox. I use the grease for o-rings and it spreads quite well, usually put a dot on the fingertip of a glove and work it in. The version I use is for high vacuum, but there are a variety of formulations, some specifically for anti-corrosion, eg, Fomblin AR 555 or Krytox XP2A7

    http://www.motionusa.com.s3-website-us-east-1.amazonaws.com/dupont/Crossover_Card.pdf

    Looks like GPL227 is available on Amazon in affordable quantities.
     
  11. razor-edge-knives

    razor-edge-knives Moderator Moderator Knifemaker / Craftsman / Service Provider

    Apr 3, 2011
    The other stuff I already have here is E-Tec 501 which I'm gonna be comparing shortly...

    _________________________________________________

    Here is an update on the parts... We've been getting a lot of rain lately so the salt solution couldn't really dry. I wanted to speed up the oxidation process so I brought them inside to dry... there were no signs of corrosion on the LCTI or One Shot blades prior to doing this but check them out now!

    So this is 2 days and 2 salt sprays and some rain

    [​IMG]
    [​IMG]
     
    Last edited: Aug 21, 2020
  12. razor-edge-knives

    razor-edge-knives Moderator Moderator Knifemaker / Craftsman / Service Provider

    Apr 3, 2011
    Looks like that's a grease though... I'm wanting an oil for pivots and to spread on blades. In reference to the engineer I spoke w/ above, he may see about development of small bottles of this stuff for the knife market which would be pretty sweet.
     
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  13. razor-edge-knives

    razor-edge-knives Moderator Moderator Knifemaker / Craftsman / Service Provider

    Apr 3, 2011
    Ok I decided to start over again w/ 4 new products. I will re-run the one shot and LCTI against the top contenders here probably. This time I'm going to keep inside (to control variables) and spray twice daily w/ salt solution then allow to air dry. Unfortunately the E-tec is expired in 2018 so I don't expect it to be a top performer but I'll try anyway.

    [​IMG]

    Here are the same blades after being sandblasted... there was some pitting on the far right one from all the rust but I at least removed it

    [​IMG]
     
  14. 954Ink

    954Ink Gold Member Gold Member Basic Member

    375
    Feb 22, 2020
    I use CLP on my guns and never had any rust on them. So I coated a stipped SR 101 blade in it twice in 1 week. Applying a heavy coating then allowing it to sit for 3 hours or more than wiping the excess off. Oddly the knife began the rust the first day I got rained on (it's my EDC). I cleaned the knife with steel wool and then soap,
    went back to mineral oil and haven't had any rust come back.
     
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  15. razor-edge-knives

    razor-edge-knives Moderator Moderator Knifemaker / Craftsman / Service Provider

    Apr 3, 2011
    Wow, that is interesting!! So when you applied the mineral oil do you wipe the excess off as well?
     
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  16. 954Ink

    954Ink Gold Member Gold Member Basic Member

    375
    Feb 22, 2020
    I apply it super thick let it saturate for at least 15 minutes then wipe the excess. I've recently started putting a tiny amount into my kydex sheaths as well. I live in FL and to much time outside. So my knives get exposed to humidity, sweat and rain.
     
  17. razor-edge-knives

    razor-edge-knives Moderator Moderator Knifemaker / Craftsman / Service Provider

    Apr 3, 2011
    cool, I'm gonna get some mineral oil to test for sure
     
  18. Fullflat

    Fullflat Gold Member Gold Member

    Jan 4, 2018
    Same here. I’m probably about 50 miles N of you, and have been disappointed by some corrosion inhibitors, but always pleased with the mineral oil’s protection :)
     
  19. einsteinjon

    einsteinjon Gold Member Gold Member

    Dec 22, 2008
    Hey Josh - awesome thread! Adding one to the potential list, how about Aegis Solutions EDCi? Just heard about it a couple days ago and bought a 4 oz bottle to try. I think i read it is at least non-toxic if not food safe...cannot remember for certain at the moment though.
     
  20. TRfromMT

    TRfromMT Gold Member Gold Member Basic Member

    Jan 4, 2016
    Can you label the blades, please? More than just on the paper towels, and maybe the start date as well? I'm going to lose track of what's applied to which one for how long.

    While you do that, I'll go get the popcorn and be right back.

    Thanks.
     

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