Corrosive Wear Mechanism of Supersonic Atmospheric Plasma Spray Coating of Hydraulic Supports in Industrial Environment
摘要
The Cr3C2-NiCr coating was fabricated using supersonic atmospheric plasma spraying technology (SAPS), and its corrosive wear resistance in a simulated underground coal mining environment was investigated before and after sealing treatment by comparing it with industrially electroplated Cr, along with the underlying mechanism of action. The results demonstrated that the Cr3C2-NiCr coating prepared via SAPS technology, exhibited preferable resistance to corrosive wear. Specifically, the corrosion current density of the ST-Cr3C2-NiCr (sealed treatment Cr3C2-NiCr) coating was 4.09 × 10−7 A/cm2 which was two orders of magnitude lower than that of the substrate (3.88 × 10−5 A/cm2) and one order of magnitude lower than hard chrome plating (7.77 × 10−6 A/cm2) and unsealed treatment Cr3C2-NiCr coating (7.76 × 10−6 A/cm2). It displayed minimal tendency to corrode and preferable corrosion resistance. The failure modes of the coating in corrosive wear primarily manifested as corrosive wear, accompanied by abrasive wear, adhesive wear, and layered spallation. The high hardness of Cr3C2, low porosity of the coating, and excellent interfacial bonding were key factors contributing to the preferable abrasion resistance exhibited by the ST-Cr3C2-NiCr coating.