PCM Hardshield, tungsten carbide coating (HVOF)

PCM HardShield is a tungsten carbide coating which replaces the traditional chrome electroplating. 

It is applied to the rotor using an HVOF (high velocity oxygen fuel) thermal spray process.  PCM Hardshield rotors have significantly improved abrasion and corrosion resistance.  PCM has selected a proprietary formula, which has been validated through field testing in abrasive applications. 

In a field trial, the PCM HardShield significantly outperformed chrome plating in an application in which slugs of solids were known to pass through the PCP. The customer had previously observed that after a torque spike (due to solids in the pump), the pump volumetric efficiency would drop drastically.