Knife oxidation (etching, bluing) in citric acid - simple about the complex.

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Valeriy Dnipro

Published on May 25, 2021
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Oxidation of the Morakniv Companion carbon steel knife is done to increase the corrosion resistance of its blade, protect it from rust and improve its appearance. Other names are etching, bluing, blackening. It is performed by creating an oxide film on the metal surface. In the simplest and most accessible version, it can be done at home, in the example from the video - with citric acid. I think I will not be mistaken if I say that this is the simplest, most accessible and inexpensive option. Speaking about the strength of the oxide film created in this way, I will note that it is less durable compared to etching used in production conditions or some other, more expensive and complex methods. Therefore, you should not count on such a coating lasting too long with constant use and careless care of the knife. 0:00 - knife for etching 0:30 - preparation of the solution 1:54 - degreasing the knife 3:34 - the first 10 minutes of the reaction 4:40 - the condition of the knife after 10 minutes 6:12 - the condition after 20 minutes 7:36 - the condition after 30 minutes 8:35 - how to stop the reaction 10:00 - several important points #etching #oxidation #knifesharpening #dneprsharpening #carbon #steel

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