利用新近研制的双相流冲刷腐蚀激光多普勒实验装置，通过失重测试、表面形貌观察、局部流速流态测试和典型部位的电化学测试，研究了突扩管条件下不锈钢ＡＩＳＩ３１６Ｌ在单相及含砂人工海水介质中的冲刷腐蚀机理．结果表明：冲刷腐蚀峰值发生在距突扩位置约３．０Ｄ的部位（Ｄ为粗管直径），与切向流速扰动度的峰值位置相同．在３．０Ｄ和５．５Ｄ的部位，冲刷作用是主要的，而在回流区（１.５Ｄ），则为氧扩散控制．不同部位的冲刷腐蚀形貌有明显差异，并与局部流速流态是相互对应的冲刷对腐蚀的影响除表现在流动对氧传质过程的促进外，对阳极过程的影响也非常显著，表现为阳极电流随流速的提高而增大以及致钝峰的出现 Using newly developed two-phase flow erosion etching laser Doppler experimental device, through the weight loss test, the surface morphology observation, the local flow velocity fluid state test and the typical site electrochemical test, the stainless steel AISI316L under the condition of single- And sandy artificial seawater medium erosion and corrosion mechanism. The results show that the peak value of erosion erosion occurs at the site of about 3.0D (D is the diameter of rough pipe) from the location of sudden expansion, which is the same as that of tangential flow velocity perturbation. At sites 3.0D and 5.5D, scouring is dominant, whereas in the reflow zone (1.5D), oxygen scavenging control is dominant. Different parts of the erosion morphology were significantly different, and local flow velocity is corresponding to the impact of erosion on corrosion in addition to the flow of oxygen in the mass transfer process to promote the impact on the anode process is also very significant, manifested as Anode current increases with the increase of flow rate and the appearance of blunt peaks