Hard chrome plating is an electroplating process that deposits a thick layer of chromium onto a metal substrate, primarily to enhance wear resistance, corrosion protection, and reduce friction.
| Parameter | Typical range | Notes & selection driver |
|---|---|---|
| Adhesion | Per ASTM B571, no flaking or peeling | |
| Hardness | 65-70 HRC | |
| Porosity | Low, minimal micro-cracks | |
| Thickness | 0.0005" to 0.020" (12.7 to 508 microns) | |
| Surface Roughness | Ra 0.1 to 0.4 μm (post-polishing) | |
| Corrosion Resistance | 500+ hours salt spray (ASTM B117) |
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This component is used in the following industrial products
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Hard chrome plating is thicker (typically >0.0001"), harder, and applied for functional purposes like wear resistance. Decorative chrome is thinner (<0.00002"), often over nickel, and used for appearance and mild corrosion resistance.
It significantly increases surface hardness, reducing wear from seals and guides; provides corrosion resistance against hydraulic fluids and environments; lowers friction for smoother operation; and can be applied to repair worn surfaces.
Traditional hexavalent chromium (Cr6+) processes involve toxic chemicals, requiring strict wastewater treatment and air emission controls. Alternatives like trivalent chromium or HVOF coatings are being adopted for reduced environmental impact.
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