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用质量损失法研究了65Mn和316L及其Ni-P镀层的冲刷腐蚀行为。结果表明:在试样表面与流体间相对运动距离相同的条件下,65Mn和316L在单相流和两相流中的冲刷腐蚀速率随着介质温度的升高和理论流速的减小而增大。在20%H_2SO_4单相流和20%H_2SO_4+20g/L黄砂两相流(50℃,1.88m/s)中,冲刷与腐蚀的交互作用引起的65Mn质量损失速率分别为80.35和127.21g·m~(-2)·h~(-1),而316L则分别为5.25和17.22g·m~(-2)·h~(-1)。在两相流中,65Mn和316L的冲刷腐蚀机制分别为均匀腐蚀+轻微微切削和轻微选择性腐蚀+轻微塑性变形。Ni-P化学镀层可显著改善65Mn和316L的冲刷腐蚀性能,且温度和理论流速越高效果越显著。
The erosion of 65Mn and 316L and their Ni-P coatings was studied by mass loss method. The results show that the corrosion rate of 65Mn and 316L in single-phase flow and two-phase flow increases with the increase of the medium temperature and the decrease of the theoretical flow rate under the same moving distance between the sample surface and the fluid. . The mass loss rate of 65Mn caused by the interaction between erosion and erosion in the two-phase flow of 20% H_2SO_4 and 20% H_2SO_4 + 20g / L yellow sand was 80.35 and 127.21g · m ~ (-2) · h ~ (-1), while that of 316L was 5.25 and 17.22g · m ~ (-2) · h ~ (-1), respectively. In the two-phase flow, the corrosion mechanisms of 65Mn and 316L are uniform corrosion + slight micro-cutting and slight selective corrosion + slight plastic deformation respectively. Ni-P electroless plating can significantly improve the erosion corrosion properties of 65Mn and 316L, and the higher the temperature and the theoretical flow rate, the more obvious the effect.