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采用自制的旋转冲刷腐蚀失重装置 ,研究了湿法磷酸中固体颗粒的性质 ,如固含量、粒径等环境参数对不锈钢 316L和 90 4L冲刷腐蚀速率的影响 ,并在扫描电镜下观察了不锈钢腐蚀的形貌 .试验结果表明 :CaSO4结晶颗粒固含量质量分数由 10 %增加到 5 0 %时 ,冲刷腐蚀速率有所增大 ,316L不锈钢主要以腐蚀为主 ,且表现为晶间腐蚀 .当浆体中含有SiO2 固体颗粒时 ,液相腐蚀性得到降低 ,虽然不锈钢 90 4L耐液相腐蚀性能优良 ,但耐冲刷 (磨损 )性能较差 ,尤其当SiO2 粒径增大时 ,冲刷腐蚀速率明显增大 .
The effects of the solid particles in wet-process phosphoric acid, such as solid content and particle size, on the corrosion rate of stainless steel 316L and 904L were studied by a self-made spin-erosion corrosion weightlessness device. The corrosion of stainless steel was observed under scanning electron microscope The results show that the corrosion rate increases when the mass fraction of CaSO4 crystal particles increases from 10% to 50%, while the corrosion rate of 316L stainless steel is mainly that of intergranular corrosion, When SiO2 solid particles are contained, the liquid corrosivity is reduced. Although corrosion resistance of 904L stainless steel is excellent, its erosion resistance (abrasion) property is poor. Especially when SiO2 particle size increases, the erosion corrosion rate increases obviously Big .