Case study of hard chrome plating application No. 3 [Plating on coating bars]

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last updated：Apr 14, 2022

オテック

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High-precision plating of thin films to maintain the groove shape of coating bars.

We received an inquiry from a film manufacturer who wanted to apply hard chrome plating to grooved bars as uniformly and accurately as possible. The primary requirement was the uniformity of the plating thickness. Variations in plating thickness directly lead to variations in the volume of the grooves, which in turn affects the amount of coating applied. After numerous prototypes, we successfully achieved hard chrome plating with a thin film of approximately 5 to 10 μm, maintaining a range of ±1 μm for 5 μm and ±2 μm for 10 μm. Regarding the type of grooves, we can accommodate both types: those made by rolling and those made by wrapping wire around a round bar. We were pleased to hear that we were able to maintain the wear resistance of hard chrome plating while preserving the groove shape, ensuring a stable coating amount and stabilizing quality.

Related Link - http://www.otec-kk.co.jp/surface/index.html

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**Characteristics of Hard Chrome Plating** ■ Hardness Generally considered to be above Hv700. At Otec, we offer high hardness plating of Hv900 or more by adjusting the bath composition. ■ Wear Resistance It has a low coefficient of friction and excellent wear resistance. ■ Heat Resistance Heating above 400°C causes a rapid decrease in hardness. At Otec, we use a dedicated furnace for baking to remove hydrogen after plating, conducted under strict temperature control. ■ Corrosion Resistance It is stable against chemical agents other than chlorides. ■ Oil Retention Due to the fine cracks on the plating surface, it has excellent oil retention properties. If further enhancement of oil retention is desired, we can also accommodate porous chrome plating with widened cracks.