采用扫描电镜,X射线衍射仪和电化学噪声技术研究了高速电弧喷涂铝稀土涂层在铜加速醋酸盐雾试验中的腐蚀行为,分析了涂层腐蚀前后的形貌及成分,通过电化学噪声谱阐释了涂层的点蚀过程。研究表明:铝稀土涂层的钝化膜在腐蚀介质中容易发生点蚀和破碎,腐蚀后涂层中的孔隙和微裂纹增多,腐蚀过程中钝化膜由亚稳态点蚀逐渐转变为稳态点蚀。 The corrosion behavior of high speed arc spraying aluminum rare earth coating in copper accelerated acetic acid salt spray test was studied by scanning electron microscopy, X-ray diffraction and electrochemical noise techniques. The morphology and composition of the coating before and after corrosion were analyzed. The noise spectrum illustrates the pitting process of the coating. The results show that the passivation film of aluminum rare earth coating tends to pitting and crushing in the corrosive medium, and the pores and microcracks in the coating increase after corrosion, and the passive film gradually changes from metastable pitting corrosion to corrosion State pitting.