Other coatings with lower roughness than chroming such as ceramic or tungsten carbide are available. Using these types of coatings avoids the blade-effect, which often happens with chrome-coating. Chroming accelerates the wear and tear of the rotor and stator for two reasons:
✓ Chrome-coating does not protect the base material from corrosion.
✓ The hardness difference between the chrome coating and the core material often causes micro fractures (cracking)
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