Abstract
This study presents a comprehensive experimental investigation of the corrosion, erosion, and abrasive wear resistance of WC–Co–Cr coatings deposited on 30Kh13 martensitic steel using the high-velocity oxygen-fuel (HVOF) spraying method. Corrosion tests were performed under cyclic salt fog conditions in a 5% NaCl solution, while erosion tests were carried out under the impact of an abrasive particle flow. Abrasive wear was evaluated using a standard method with the calculation of relative wear resistance. The results showed that the WC–Co–Cr coating significantly reduces mass loss and slows the development of corrosion and erosion damage compared with uncoated steel. Under abrasive wear conditions, the relative wear resistance of the coated samples is appro-ximately nine times higher than that of 30Kh13 steel. Microstructural analysis revealed that coating degradation is localized and mainly associated with the destruction of the binder phase. The obtained results confirm the effectiveness of WC–Co–Cr HVOF coatings for protecting parts operating under combined corrosion-mechanical influences