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Another rust and patina problem

Wed Jan 08, 2014 10:31 pm

Okay so I thinned and sharpened my first carbon knife along with a few other stainless knives the other day and my poor technique along with neglect caused some rust to form. What happened was the low angle I was using while thinning along with swarf building up just above the edge stripped a few millimeters down to the bare carbon and while sharpening the other knives I didn't wipe off the excess water and by the time I was done with the other two, bam rust. Soooo, I got some barkeepers friend and was wondering if I should force a slight patina back on to the freshly cleaned metal with an onion or tomato or some mustard or something as to prevent from having to clean it again. What do you guys do when you sharpen carbon blades cause it seems that no matter how careful I am I get sharpening marks up the side of the blade and it has never been an issue until I started using carbon blades.

Re: Another rust and patina problem

Wed Jan 08, 2014 10:58 pm

BKF should get rid of the rust if it isn't too bad. A patina will occur when you cut acidic food. Some people like it, some don't; it offers a little (not a lot) of protection from rust. You'll learn to minimize sharpening scratches as you progress. If they bother you (as they do me) you can stock up on sandpaper and micro-mesh and learn to polish them out (and get rid of the patina at the same time).

Re: Another rust and patina problem

Wed Jan 08, 2014 11:22 pm

You don't have to force anything. Just dry the blade off completely after sharpening and you should be good. Like wsfarrell said, a patina will happen on its own, but it won't hurt anything if you force one anyway.

When I am done with grinding on the stones I will strop the places I thinned as well as where I sharpened. It helps to polish the sides a bit and remove the really shiny scratches giving the metal a good clean surface to get a new patina on. Really though, scratches don't bother me but as you get more consistent you should see less random scratches outside the area where you were sharpening or thinning. Other than that you are rubbing the metal blade against a sharpening stone... scratches will happen. ;)

Re: Another rust and patina problem

Wed Jan 08, 2014 11:43 pm

Cool, thanks a lot guys! As always very informative and helpful.

Re: Another rust and patina problem

Thu Jan 09, 2014 12:36 am

Well, I put some BKF on a scouring pad and the rust cleaned off in two seconds and I used the newly cleaned knife to cook dinner with and she is already starting to form a slight patina so thanks again guys for the great advice.

Re: Another rust and patina problem

Thu Jan 09, 2014 3:47 am

From all my research I've never seen a blade rust that fast. You want to wipe it down often to keep it reacting with your food, but it shouldn't rust that quickly. The petina on my Naikri has a slight oil slick look to it. You might just be mistaking the patina for rust

Re: Another rust and patina problem

Thu Jan 09, 2014 7:33 am

After thinning a carbon monosteel, I apply hot vinegar by dabbing the newly blank steel surface to restore the patina. Rinse with hot water, wash with soap.
So I don't have to worry about discoloured onions.
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