HVOF and HVAF WCCo Tungsten Carbide Coatings in India HVAF and HVOF WC-Co tungsten carbide coatings exhibit excellent resistance to sliding wear, abrasion and erosion but have slight lower corrosion resistance than WC-CoCr. HVAF WC-Co thermal spray coatings are non-permeable to gas and liquid at even 50 microns. Tungsten carbide WC-12Co layers are resistant to … WC-Co Tungsten Carbide Coating