(中國科學院 金屬腐蝕與防護研究所， 金屬腐蝕與防護國家重點實驗室， 沈陽 110015)
摘 要: 利用原子力顯微鏡(AFM)原位考察了銅在SO2質(zhì)量分數(shù)為0.9×10-6和90％相對濕度條件下，大氣腐蝕過程中表面形貌及結(jié)構變化， 觀察到銅在大氣腐蝕中高分辨的形貌變化過程： 銅表面逐漸形成納米級的蝕點， 并隨著時間延長變大和彼此交迭， 而后開始更大尺度的新一層次蝕點的發(fā)展，表現(xiàn)出腐蝕微電池層次發(fā)展特征。 紅外反射吸收光譜(IRAS)表明， 堿式硫酸鹽是構成腐蝕產(chǎn)物膜的主要組分。 石英晶體微天平(QCM)原位測得的動力學曲線表明，銅在該條件下的腐蝕速度呈現(xiàn)出隨時間延長而逐漸下降的趨勢， 說明形成的腐蝕產(chǎn)物對進一步腐蝕產(chǎn)生抑制作用。
關鍵字: 銅； 大氣腐蝕； 原子力顯微鏡； 石英晶體微天平
（State Key Laboratory of Corrosion and Protection of Metals, Institute of Corrosion and Protection of Metals, Chinese Academy of Sciences, Shenyang 110015, P.R.China）
Abstract:The insitu AFM morphologies of copper exposedto 0.9×10-6 SO2 (mass fraction) and 90% relative humidity (RH) were obtained. During the atmospheric corrosion, corroding dots occur on copper surface and grow gradually with time, so that relatively even and uniform corrosion film is formed when the corroding dots become big enough to overlap in given exposure period. Furthermore, the new and bigger corroded dots form and develop. The infrared reflection absorption spectroscopy (IRAS) indicates that there is basic sulfate copper as major corrosion products on the copper surface. The kinetic curve of mass change of copper under the condition which is recorded by insitu quartz crystal microbalance (QCM) demonstrates that the corrosion rate decreases with time and the corrosion products restrain the further corrosion on copper surface.
Key words: copper； atmospheric corrosion； atomic force microscopy (AFM)； quartz crystal microbalance (QCM)
