Satin vs Coated in terms of rusting

C

Cappy2cap

Joined
May 19, 2009
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Is the satin blade a lot more likely to rust or show rust spots than a coated blade overtime?
 
I've had my satin culti in my wet tackle box for a week and zero rust on the blade.
Can't recall seeing any INFI rust pictures on here other than 2 pictures of ones with the scales removed to reveal a little under the scales. If I recall correctly, they were older blades.
I'd go with satin myself.
 
I've read that INFI is not a stainless steel but I've gotta say it's the most stain resistant non-stainless steel I've ever had the pleasure of experiencing.
 
I always put a thin coating of oil on all of my knives after using them so I never have any problems with "non" rust-resistance steels like CPM-3V. It is not much work and keeps my knives always free from corrosion.
 
mikeymoto said:
I've read that INFI is not a stainless steel but I've gotta say it's the most stain resistant non-stainless steel I've ever had the pleasure of experiencing.
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+3

I LOVE and ALWAYS prefer satin. With INFI, (not including decarb blades), I don't worry about rust. I wish I could afford more satin INFI. :(

INFI will rust if you try hard enough, but it doesn't rust easy. As stated, VERY easy to maintain for a non-stainless. :thumbup:

.
 
Satin. Gimme satin every time. I've never had any problems with rusting on any of my Busses. Ever. Even after using them and putting 'em away without cleaning. I've never had a lick of rust on my Competition Grade Jackhammer either, though I know plenty of other guys have. In my personal experience, INFI is more stain resistant than D2, ZDP-189 and maybe even 154CM. I've come to think of it as stainless, under the conditions my knives encounter. The only thing that's ever discolored any of my INFI knives is food prep. And that cleans up with just a quick swipe of Simichrome or Flitz.

Coated blades are fine, I just prefer satin, if I can afford it.

Personally, I do not like the doublecut finish.
 
I prefer satin over double-cut as well.

I prefer the looks of satin over double-cut.

Satin seems to resist corrosion better than double-cut.

And MOST importantly, when I use and scratch up my satin, the satin is WAY easier to make look more natural by buffing with scotchbrite pads, sandpaper and similar than double-cut.

Scratches on Double-cut are VERY noticable and beyond most people's ability to bring back to factory look.

Satin RULES!
 
moonwilson said:
I've never had a lick of rust on my Competition Grade Jackhammer either, though I know plenty of other guys have.
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My "Decarb" HR rusted more readily and more quickly with just humidity and no direct wetness and not in sheath than any 1095, 0170-6, O1 or ANY other steel I have ever had.
However, I have had and seen many 10XX steels, O1, 0170-6 rust worse and deeper over time.... if that makes sense.

But, the Decarb blade was by FAR the exception. Generally, INFI "IS" much more resistant to corrosion than ANY other non-stainless steel I have.


moonwilson said:
In my personal experience, INFI is more stain resistant than D2, ZDP-189 and maybe even 154CM.
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"Generally" steels are rated as stainless or non-stainless based on chromium content. Generally, steels with above 11% to 13% are considered stainless.
But, in reality, there are plenty of other factors that determine corrosion prone vs. resistant.

"Ratio" of percentage of carbon compared to percentage of chromium is apparently one of these factors and not just chromium percentage alone.

Personally, I can't agree about 154CM being less corrosion resistant than INFI. I find 154CM much more corrosion resistant than INFI.

D2 is a somewhat fair argument. I have generally had more resistance in corrosion with D2 compared to INFI. But, close enough to compare and not really argue for or against IMO.

From my experience (not including the "decarb" blade), I "Have" had some very minor rust on INFI, but very superficial on the surface without going deep or pitting and easily removed.

And while I only own about 5 D2 blades vs. many more INFI blades, I do have some hardened D2 tools. I have never seen any significant rust on my D2 knife blades including my Bog Dog that has been used enough. But, I have seen some rust on the tools. Might be a difference in hardening. But, most likely due to higher humidity in garage vs. my knives being kept indoors with air-conditioning when not used (?????).

I could post the numbers of chromium and carbon for different steels, but I haven't personally seen where the number give a simple concisive indication to corrosion resistant. There just appear to be too many other factors that make incremental differences. And I don't know of a mathmatical formula that can determine the significance of the different "Ratios".

ZDP-189 is a WHOLE different creature in composition. ZDP-189 has 3% carbon compared to INFI's 0.5" carbon (6 times more than INFI).

INFI has a pretty LOW amount of carbon. And while I don't fully understand the process, my "loose" understanding is that Nitrogen helps reduce the amount of carbon needed while still reaching certain levels of hardness and edge holding. (?????)... or something like that. :confused:

And while ZDP-189 has a VERY high amount of chromium as well at 20%, it's ratio of chromium to carbon is actually WAY lower than most stainless steels.

So, whill ZDP-189 might generally be classified as stainless due to it's VERY high chromium content, I think it's EXTREMELY high carbon content negates most of the chromium and makes ZDP-189 MUCH less corrosion resistant than most any other stainless steel - and yeah, even though I only have 1 ZDP-189 Spyderco (holds an AMAZING edge for a VERY long time :thumbup:), I tend to "assume" ZDP-189 might not be so good at resisting corrosion...... But, not enough 1st hand eperience to argue emphatically yet. :confused:


Ultimately, real world use seems to be a much better indicater for most people compared to trying to discern the large number of variables.

.
 
Only under harsh conditions like exposure to salt water or lots of sweat (for example from being worn against your skin in an inside the waistband sheath), or maybe being in constant high humidity, is INFI likely to rust. I have only seen one INFI knife with any rust and it had been stored in a shelter outside. When I use my INFI knives and they are really dirty, I clean them with hot soapy water and dry them with a rag, and I have never had a problem with rust, and I don't coat the blades with anything. A satin finish is nice, so if you like it and it is affordable, then buy it and enjoy it without worrying about it rusting.

Gene
 
My Nuke heart has small pinpoint spots of rust on it. When I came home after being away for a year+ my Skinny ASH had been used a lot in the kitchen. It had rust on the exposed edge and was very dull. Sharpening took care of both problems with no recurrence. Just my experience but YMMV

Bob
 
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