The impact of deposition of multilayer CrN/CrCN coating on X6CrNiTi18-10 steel by means of the PVD (physical vapour deposition) method on resistance to cavitation erosion has been investigated. Cavitation tests were performed using a cavitation chamber with a barricade system at the inlet pressure p₁ = 600 kPa and the outlet pressure p₂ = 123 kPa. Deposition of CrN/CrCN coating allowed increasing duration of the incubation period and decreasing cumulative volume loss until 500 min of exposure. The erosion of the CrN/CrCN–X6CrNiTi18-10 system begins with the removal of microdroplets from the coating surface and surface undulation. The surface undulation increases with the exposure time leading to coating fracture in a brittle mode. Initiation sites of cracks were located inside the PVD coating. Measurements of surface roughness illustrate uneven degradation of the exposed surface and the location of slight and severe erosion zones. The Ra parameters obtained for the CrN/CrCN–X6CrNiTi18-10 system and X6CrNiTi18-10 steel after 180 min of erosion were comparable. An elongation of erosion test up to 600 min resulted in a higher increase in surface roughness of the CrN/CrCN coating–X6CrNiTi18-10 steel system in comparison to that of X6CrNiTi18-10 steel. With increasing exposition time, the rate of increase of the surface roughness decreased due to overlapping damage.

中文翻译：

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奥氏体钢上多层CrN / CrCN PVD涂层沉积对耐空蚀性影响的实验研究

研究了通过PVD（物理气相沉积）方法在X6CrNiTi18-10钢上沉积多层CrN / CrCN涂层对抗气蚀的影响。使用具有路障系统的空化室在入口压力p ₁ = 600 kPa和出口压力p ₂进行空化测试= 123 kPa。沉积CrN / CrCN涂层可以延长孵育时间，并减少累积体积损失，直到暴露500分钟。CrN / CrCN–X6CrNiTi18-10系统的腐蚀始于去除涂层表面的微滴和表面起伏。表面起伏随着暴露时间而增加，导致涂层以脆性模式断裂。裂纹的起始位置位于PVD涂层内部。表面粗糙度的测量表明暴露表面的不均匀降解以及轻微和严重腐蚀区的位置。腐蚀180分钟后，CrN / CrCN–X6CrNiTi18-10系统和X6CrNiTi18-10系统获得的Ra参数具有可比性。与X6CrNiTi18-10钢相比，腐蚀试验延长至600分钟导致CrN / CrCN涂层–X6CrNiTi18-10钢系统的表面粗糙度更高。随着曝光时间的增加，由于重叠损伤，表面粗糙度的增加速率降低。