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difference between nitriding treatment and blackening treatment

Nitriding and blackening are both to make the surface of the material wear-resistant and corrosion-resistant. I understand the difference in process. What is the actual effect? Under what circumstances should we switch to nitriding, and under what circumstances should we use blackening?
In addition, how do these two processes affect the size of the part?

Blackening is generally used for decoration, the rust resistance is not very good, and the wear resistance is limited. Nitriding (QBQ) is mainly wear-resistant lubrication, and has good corrosion resistance, but its processing temperature is generally between 480-550. It is easy to have an annealing effect on general steel. What’s more, its cost is much higher than the black price.

Post time: Dec-20-2021