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设计了一套高速喷射腐蚀装置,喷射液流速度达150 m/s,并且在喷射过程中可以精确控制喷射速度。该装置能与电化学工作站联机,进行电化学测试。根据流体力学理论,建立喷射流体力学模型,确立了喷射速度、喷射冲击力和表面切应力与喷射压力之间的关系,并采用实验方法验证了流体力学模型的正确性。利用失重法和电化学方法,进行了喷射腐蚀实验。结果表明,由喷射液流产生的冲击力对喷射腐蚀及其形貌有很大的影响,并且与表面切应力共同作用引起阳极极化过程改变,加速电化学腐蚀。采用冲击力描述喷射腐蚀规律较表面切应力更为合理。
A high-speed jet erosion device was designed with a jet velocity of 150 m / s and precise control of jet velocity during jetting. The device can be online with the electrochemical workstation for electrochemical testing. According to the theory of fluid mechanics, the jet fluid mechanics model is established, and the relationship between jet velocity, jet impact force and surface shear stress and jet pressure is established. The correctness of the hydrodynamics model is verified by experimental method. The jet erosion experiment was carried out by weight loss method and electrochemical method. The results show that the impact force generated by jet flow has a great influence on the spray corrosion and its morphology, and the interaction with the surface shear stress causes the anodic polarization process to change and accelerate the electrochemical corrosion. It is more reasonable to describe the jet erosion law by impact than the surface shear stress.