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M390 Corrosion test

Discussion in 'Knife Reviews & Testing' started by shinyedges, Feb 20, 2018.

  1. shinyedges

    shinyedges Every man's intelligence is a god Platinum Member

    Jun 5, 2012
    This is an old blade from a zero tolerance 0620cf that I carried and used for more than a year starting back in 2015 I think. I used this blade for everything from food prep to swimming in the ocean, rivers, lakes many times not being maintained until I got home several days later in some instances. I have never seen this hunk of m390 stain or rust in anyway. I ended up selling the 0620cf but kept this blade, it was sold with a new blade out of 204p.

    I know this steel WILL rust, I just have never seen it rust in real world use in the time I owned and used it. So we will see what it takes to force some corrosion on m390.

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    The blade was washed with dawn dish soap and scrubbed with alcohol and dried to remove all oils

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    I labeled the areas with what we will be testing it with today :
    Sea salt
    Horseradish mustard
    apple cider vinegar

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    Here is the sea salt:

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    Here is the mustard:

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    Here is the vinegar:

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    Here is the blade with the sea salt, mustard, vinegar: I tried to get the sea salt, mustard and vinegar on both the stonewashed and satin surfaces.

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    Here is the time everything went on:

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    I won't stop until I see some serious freaking rust. :D I will up the ante if I don't get the corrosion levels that I know can be forced!
     
    Last edited: Feb 20, 2018
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  2. shinyedges

    shinyedges Every man's intelligence is a god Platinum Member

    Jun 5, 2012
    I'll use this spot to post updates on the blade but for now, my pooch! I her got while stationed at fort bliss tejas! She was a squirt at the time..

    [​IMG]



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    Here is roughly 1 hour later:

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    Here is roughly 2 hours later: Notice the water evaporating from vinegar and salt, I can see no corrosion or red rust forming yet.

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    Here is roughly 3 hours, no discernible changes. Notice the apple cider vinegar crept under the tape.

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    This is at 5:45 am

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    This pic was taken at 5:45 am this morning notice the red in the salt in the top corner.
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    best image hosting websites
     
    Last edited: Feb 21, 2018
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  3. shinyedges

    shinyedges Every man's intelligence is a god Platinum Member

    Jun 5, 2012
    Last edited: Feb 21, 2018
    Mr.SATism likes this.
  4. shinyedges

    shinyedges Every man's intelligence is a god Platinum Member

    Jun 5, 2012
    Over all, I did see some red specks from the salt in the very corner on the stonewash. They seem to have gone away mostly from rinsing and drying. I have a few more pics to upload later. No rust from mustard or vinegar.

    The mustard appeared to have left a residue on the surface, I rubbed it with my finger and it seemed to come off. I'll have to wash the blade with soap and water with a sponge and see if any of the residue remains. I suspect not.
     
    Last edited: Feb 21, 2018
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  5. Lapedog

    Lapedog Gold Member Gold Member

    Dec 7, 2016
    I feel like when Bohler invented m390 they accidentally stumbled upon an absolute miracle steel. How can a steel be easy to sharpen and yet hold an edge well? Ontop of that it appears to be greatly rust resistant.

    Now I want to see some tests on how tough it is.

    Thank you for sharing this! I love these threads that expand our knowledge.
     
    Last edited: Feb 21, 2018
    AmosPaul likes this.
  6. shinyedges

    shinyedges Every man's intelligence is a god Platinum Member

    Jun 5, 2012
    I agree, m390 has been superb for me, I sharpened it quite a bit. As you know the 0620cf is a tanto and the blade you see me testing has had a minor shape change to create a small belly. Through the 1 to 2 years I used and carried this blade it under went many sharpenings and did everything I asked without issue.

    Glad I could contribute.
     
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  7. shinyedges

    shinyedges Every man's intelligence is a god Platinum Member

    Jun 5, 2012
    And who knows, I may do some destruction testing on this piece for the hell of it.
     
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  8. microbe

    microbe

    215
    Apr 6, 2016
    You test should be longer. Following a scenario of using the knife, pocketing it, forgetting about it while using another knife for a few days, then remembering and finding the knife, that has been sitting dirty for a few days.
     
  9. shinyedges

    shinyedges Every man's intelligence is a god Platinum Member

    Jun 5, 2012
    True, that is a plausible scenario. I could let it sit in a tube of salt water for 2 days. I think all that would achieve is a speckle here and there of rust, but meh.
     
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  10. microbe

    microbe

    215
    Apr 6, 2016
    That's how I first stained my K390. LOL. I cut up a few slices of lemon for some alcoholic beverages, and then put my attention to the beverages and forgot about cleaning the knife.
    I then used another knife for a few days. Wen I picked up the the K390 again I was like WTF!
     
  11. shinyedges

    shinyedges Every man's intelligence is a god Platinum Member

    Jun 5, 2012
    LOL I've done the same thing! When I get home I'll throw it in salt water for a few days. Then I think I'll test it to failure.
     
  12. snapshot2017

    snapshot2017

    133
    Jan 28, 2017
    Thanks for doing this test on a M390 steel knife blade, your test also shows how ZT heat treats this type of steel, to keep it's ability to resist all types of corrosion.
     
  13. AmosPaul

    AmosPaul

    416
    Dec 17, 2014
    Good test, thanks for posting the results.
     
  14. BBW

    BBW Gold Member Gold Member

    705
    Dec 2, 2005
    any more testing?
     
  15. shinyedges

    shinyedges Every man's intelligence is a god Platinum Member

    Jun 5, 2012
    Not yet, kinda got pushed on the rear burner. But since you brought it up, is there something you wanted to see specifically?
     
  16. BBW

    BBW Gold Member Gold Member

    705
    Dec 2, 2005
    thanks!! I would like to see 24h in salt water for sure! that would be the scenario of being exposed to a beach vacation ;-)
     
  17. shinyedges

    shinyedges Every man's intelligence is a god Platinum Member

    Jun 5, 2012
    Ask and you shall receive, I'll start it when I get home.
     
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  18. BBW

    BBW Gold Member Gold Member

    705
    Dec 2, 2005
    Sweet!!!!!!!!! thank you very much!!!!!
     
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  19. shinyedges

    shinyedges Every man's intelligence is a god Platinum Member

    Jun 5, 2012
    [​IMG]

    Went in just after 7pm est.
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  20. shinyedges

    shinyedges Every man's intelligence is a god Platinum Member

    Jun 5, 2012
    I actually added a tiny bit more water to cover the entire blade.
     
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