浆液冲击角度对Cr30A高铬铸铁冲蚀行为的影响

在模拟湿法脱硫浆液流动环境中,研究了NaCl溶液+石英砂酸性浆液冲击角度(与试样冲击表面夹角)对Cr30A高铬铸铁冲蚀行为的影响。结果表明:在浆液以60°和30°角度冲击铸铁后,在腐蚀与磨损的交互作用下铸铁的质量损失较大;浆液垂直冲击铸铁后,铸铁的质量损失较小,质量损失的主要原因是冲击磨损;浆液平行冲击铸铁后,铸铁的质量损失最小,质量损失的主要原因是点蚀。浆液平行冲击时铸铁的冲蚀机理以显微切削为主;浆液以30°角度冲击时的冲蚀机理以切削、犁削为主,铸铁表面存在挤出棱、冲击坑以及浅层片状疲劳剥落现象;浆液以60°角度冲击时的冲蚀机理以深层材料大块脱落和严重腐蚀磨损为主;浆液垂直冲击时的冲蚀机理主要是表层材料脱落,并伴随轻微腐蚀磨损。

Effect of Slurry Impact Angle on Erosion Behavior of Cr30A High Chromium Cast Iron

In simulated wet desulfurization slurry flow environment,the effect of impact angle of NaCl solution+quartz sand acid slurry with sample impact surface on the erosion behavior of Cr30 A high chromium cast iron was studied.The results show that the mass loss of the cast iron was relatively large under the interaction of corrosion and abrasion after the slurry impacted the cast iron at angles of 60°and 30°.The mass loss of the cast iron was relatively small after the slurry impacted the cast iron vertically,and the main cause of the mass loss was impact abrasion.The mass loss of the cast iron was the smallest after the slurry impacted cast iron parallelly,and the main cause of the mass loss was pitting.When the cast iron was subjected to the paralled impact of the slurry,its erosion mechanism was mainly micro-cutting.When subjected to the 30°angle impact of the slurry,the erosion mechanism was mainly cutting and plowing,and extrusion edges,impact pits and shallow flaky fatigue peeling existed on the cast iron surface.When subjected to the 60°angle impact of the slurry,the erosion mechanism was mainly deep material layer peeling and severe corrosion abrasion.When subjected to the vertical impact of the slurry,the erosion mechanism was mainly the shedding of surface material,accompanied by slight corrosion abrasion.