Besides salt water, what do you find causes rust the most?

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Evil D
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Besides salt water, what do you find causes rust the most?

Postby Evil D » Sun Oct 04, 2020 1:00 pm

I think the obvious most common rust issue is from body sweat, but are there any other things you encounter with your knife that you've found to be a sure way of rusting your blade?

Specifically not looking for ways to prevent rust...quite the opposite.
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Re: Besides salt water, what do you find causes rust the most?

Postby JuPaul » Sun Oct 04, 2020 1:26 pm

One of the few times I've had surface rust issues on the edge of a blade was from using my 52100 manix for yard work - mostly cutting back honeysuckle vines and shoots on cherry trees - and forgetting to wash it after. So to answer your question: plant goo??
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Holland
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Re: Besides salt water, what do you find causes rust the most?

Postby Holland » Sun Oct 04, 2020 1:34 pm

i use my gb2 for food prep and keep getting small dots from fruit and veggies and meat.

could use your project Caribbean to cut food scraps for weeks on end without rinsing it?!?!
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Re: Besides salt water, what do you find causes rust the most?

Postby JonLeBlanc » Sun Oct 04, 2020 1:43 pm

As far as rust goes, plain "water water" will rust 52100 and K390 quickly enough in my experience. Patina oxidation will happen virtually instantaneously on 52100 with Tabasco sauce (yes, I've tried it).
My collection so far: 52100 Military (2); 52100 PM2 (2); 52100 Para3; Stretch2 V-Toku; KnifeWorks M4 PM2; BentoBox M390 PM2; BentoBox S90V Military; Police4 K390; S110V PM2; SS Delica AUS-6; Wayne Goddard Sprint VG-10
Wish list: Hundred Pacer; Sliverax; Mantra; 52100 PM2 SE; Kapara

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Re: Besides salt water, what do you find causes rust the most?

Postby sal » Sun Oct 04, 2020 1:55 pm

Hi David,

Interesting question.

I'd add "chemicals". When I was mfg aerospace parts back in another life-time, I learned that acids, alkaline, salts,etc. can be very hard on steels and other materials. I had to make a solid Teflon ring as the chemicals would even eat gold. Chlorine is hard on steels in any form; salt is Sodium Chloride (Chlorine), saltwater. Many foods can affect steel in many ways.

sal

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Re: Besides salt water, what do you find causes rust the most?

Postby bearfacedkiller » Sun Oct 04, 2020 2:07 pm

Yup, plant goo. That is my main source of corrosion.
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sal wrote:Knife afi's are pretty far out, steel junky's more so, but "edge junky's" are just nuts. :p
SpyderEdgeForever wrote: Also, do you think a kangaroo would eat a bowl of spagetti with sauce if someone offered it to them?

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Evil D
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Re: Besides salt water, what do you find causes rust the most?

Postby Evil D » Sun Oct 04, 2020 2:19 pm

Holland wrote:
Sun Oct 04, 2020 1:34 pm
could use your project Caribbean to cut food scraps for weeks on end without rinsing it?!?!


Oh I'm gonna do far more ridiculous than that :D
SHARPEN IT LIKE YOU LOVE IT, USE IT LIKE YOU HATE IT
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Re: Besides salt water, what do you find causes rust the most?

Postby Wartstein » Sun Oct 04, 2020 2:25 pm

I have a hard time to ever rust my knives: I carry them IWB when trailrunning (and sweating of course) or sometimes for days in wet pockets or packs, cut food,don´t "baby" the blades at all, but still almost no signs of corrosion on VG10, S30V, XHP, BD1 and BD1N, N690, D2.... , even HAP 40 shows though a nice patina actually no real rust in my use

My Rex 45 Manix LW though has developed some tiny specs already. Hard to be seen though, and I did cut meat and fruits already with this knife and carried it a lot in sweaty and humid conditions as well.

On one occasion I left an O1 blade (very rustprone anyway of course) accidently in dissolved denture cleaner (yes, I luckily DO still have all my natural teeth ;), but denture cleaner is great for cleaning bike bottles or the like) for an hour or so. This really caused a lot of corrosion in a short period of time - no wonder, just looked up what ingredients that stuff can have: Citric acid, sodium bicarbonate, sodium perborate, sodium polyphosphate.. sounds pretty aggressive...
Top three going by pocket-time: Endura 4 in VG 10/Micarta-scales; Stretch 1 in VG 10; Endura 4 in HAP 40

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Re: Besides salt water, what do you find causes rust the most?

Postby cycleguy » Sun Oct 04, 2020 2:36 pm

Lack of proper care!

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Re: Besides salt water, what do you find causes rust the most?

Postby ugaarguy » Sun Oct 04, 2020 2:43 pm

Sweat; juice / residue (citric acid) from cutting lemons, limes, or oranges for cocktails.

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Re: Besides salt water, what do you find causes rust the most?

Postby vivi » Sun Oct 04, 2020 3:03 pm

I've never found anything that rusts knives like my sweat.

Vinegar, mustard and tomato also do a number on steel pretty quick.
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Pacific Salt 2 LC200N | Manix XL M4 DLC | Aqua Salt

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Re: Besides salt water, what do you find causes rust the most?

Postby JD Spydo » Sun Oct 04, 2020 4:04 pm

In the past I've had some trouble with various food acids and especially on ZDP-189. I've also had stains from food acids on VG-10, 440V and S30V just to name a few.

Another corrosive villian I've had to deal with is chlorine bleach ( Clorox). Times I've done cleaning jobs and when I've gotten bleach on my blade I've had some bad results as well. I've gotten to where I'm now very careful to rinse all my knives after using them with just about any corrosive substances.

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Re: Besides salt water, what do you find causes rust the most?

Postby dj moonbat » Sun Oct 04, 2020 4:14 pm

ugaarguy wrote:
Sun Oct 04, 2020 2:43 pm
Sweat; juice / residue (citric acid) from cutting lemons, limes, or oranges for cocktails.
Yeah, lemons.

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Re: Besides salt water, what do you find causes rust the most?

Postby nerdlock » Sun Oct 04, 2020 5:40 pm

Climate and humidity.

I've taken good care of my months-old GB2...making sure to oil it lightly before putting in into my watertight knife case. Never cut food or done food prep with it. Only dry cutting applications and I really made sure to wipe it down on my pants or shirt after use. Checked it and now it has developed about three or four very small spots on the blade edge and one near the spine.

I'm betting it was because it has been quite humid and rainy the past month here.

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Re: Besides salt water, what do you find causes rust the most?

Postby VooDooChild » Sun Oct 04, 2020 6:13 pm

Entropy.
sal wrote:
Thu May 28, 2020 8:14 pm
... "The edge is a ghost"...

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Bloke
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Re: Besides salt water, what do you find causes rust the most?

Postby Bloke » Sun Oct 04, 2020 6:33 pm

I think blood runs a close second to saltwater. :eek:
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Re: Besides salt water, what do you find causes rust the most?

Postby nerdlock » Sun Oct 04, 2020 6:34 pm

Wartstein wrote:
Sun Oct 04, 2020 2:25 pm

On one occasion I left an O1 blade (very rustprone anyway of course) accidently in dissolved denture cleaner (yes, I luckily DO still have all my natural teeth ;), but denture cleaner is great for cleaning bike bottles or the like) for an hour or so. This really caused a lot of corrosion in a short period of time - no wonder, just looked up what ingredients that stuff can have: Citric acid, sodium bicarbonate, sodium perborate, sodium polyphosphate.. sounds pretty aggressive...

Off topic, but how is denture cleaner for water bladders? I have an Osprey hydration pack that's developed a funk because it's hard to clean the flexible bladder and hose unit...

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Re: Besides salt water, what do you find causes rust the most?

Postby Cambertree » Sun Oct 04, 2020 7:07 pm

VooDooChild wrote:
Sun Oct 04, 2020 6:13 pm
Entropy.
LOL, that’ll do it! :D

On a more minor time scale, yep green plant sap, blood, salty pickle vinegar, and other foodstuffs like citrus all do it pretty strongly for me.

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Re: Besides salt water, what do you find causes rust the most?

Postby James Y » Sun Oct 04, 2020 7:20 pm

nerdlock wrote:
Sun Oct 04, 2020 5:40 pm
Climate and humidity.

I've taken good care of my months-old GB2...making sure to oil it lightly before putting in into my watertight knife case. Never cut food or done food prep with it. Only dry cutting applications and I really made sure to wipe it down on my pants or shirt after use. Checked it and now it has developed about three or four very small spots on the blade edge and one near the spine.

I'm betting it was because it has been quite humid and rainy the past month here.
If I were still living in Taipei, Taiwan, I’d be carrying a linerless Salt. Especially during the summer months, but all year, really.

Jim

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Enactive
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Re: Besides salt water, what do you find causes rust the most?

Postby Enactive » Sun Oct 04, 2020 8:03 pm

nerdlock wrote:
Sun Oct 04, 2020 6:34 pm
Wartstein wrote:
Sun Oct 04, 2020 2:25 pm

On one occasion I left an O1 blade (very rustprone anyway of course) accidently in dissolved denture cleaner (yes, I luckily DO still have all my natural teeth ;), but denture cleaner is great for cleaning bike bottles or the like) for an hour or so. This really caused a lot of corrosion in a short period of time - no wonder, just looked up what ingredients that stuff can have: Citric acid, sodium bicarbonate, sodium perborate, sodium polyphosphate.. sounds pretty aggressive...

Off topic, but how is denture cleaner for water bladders? I have an Osprey hydration pack that's developed a funk because it's hard to clean the flexible bladder and hose unit...

I think you need a hose brush. That has made a big difference for my hydration bladder hygiene. Disassemble as much as possible and scrub out. Osprey makes good stuff.

I have had good luck with baking soda as a cleaner too.


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