(1. 中國海洋大學 材料科學與工程研究院，青島 266100；
2. 中國海洋大學 化學化工學院，青島 266100)
摘 要: 通過靜態(tài)浸泡腐蝕實驗，采用掃描電子顯微鏡、X射線能譜儀、電化學實驗等研究鎂合金鈰轉化膜在0.05 mol/L NaCl溶液中的腐蝕行為，探討膜層腐蝕機理。結果表明：隨著浸泡時間的延長，膜層發(fā)生腐蝕和遭到破壞的程度也隨之增強，浸泡初級腐蝕產物組織疏松，腐蝕后期腐蝕產物的致密性和緊實度增加；腐蝕產物主要由鎂、氧等元素組成。隨浸泡時間的延長，膜層電阻和腐蝕電位先增大后減小，腐蝕電流密度呈現(xiàn)先減小后增大的趨勢。
關鍵字: 鎂合金；鈰轉化膜；腐蝕行為；腐蝕機理
（1. Institute of Material Science and Engineering, Ocean University of China, Qingdao 266100, China;
2. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China）
Abstract:The corrosion behavior and corrosion mechanism of the cerium conversion coating on magnesium alloy in 0.05 mol/L NaCl solution were investigated by using static immersing corrosion test, scanning electron microscope, energy dispersive spectrometer and electrochemical methods. The results show that with increasing the immersion time, the corrosion and damage degree of coating increase. The initial corrosion product is loose and the density and compactness of the coating corrosion products of coating increase, the main compositions of corrosion product, are Mg and O elements. The film resistance and corrosion potential increase at the first stage, and then decrease with increasing the immersion time, while the corrosion current density changes in the opposite tendency.
Key words: magnesium alloy; cerium conversion coating; corrosion behavior; corrosion mechanism
