Processing Overview

・Black finish processes for steel generally form a thin film of 1μm or less, and are used for temporary rust prevention and aesthetics.
PAPRO Black can form films thicker than 1μm, and by generating cracks on the surface, it can improve the sliding performance in the oils.
・Since the static friction coefficient is higher than that of the steel surface, rolling motion of the rotating elements of the bearing is ensured and damage such as smearing, can be prevented.

・Cracks are created on the surface to increase the oil film volume and improve sliding performance and corrosion resistance.
・Unlike general surface treatment films, oxide films penetrate and are formed inside the steel. Therefore, surface roughness and dimensions before and after treatment hardly change.

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