腐蝕行為
(蘭州理工大學(xué) 甘肅省有色金屬新材料省部共建國(guó)家重點(diǎn)實(shí)驗(yàn)室，
蘭州 730050)
摘 要: 通過(guò)靜態(tài)浸泡腐蝕實(shí)驗(yàn)、電化學(xué)實(shí)驗(yàn)、X射線(xiàn)衍射分析、掃描電鏡、電子探針、光電子能譜等方法研究高鋁青銅合金Cu-14Al-X在5.0% H2SO4溶液中的耐蝕性能及腐蝕行為。結(jié)果表明：在H2SO4溶液中，Cu-14Al-X合金有良好的耐蝕性能，合金中的(α+γ2)共析體與β′相、α相和κ相相比，具有優(yōu)先腐蝕傾向，合金主要發(fā)生脫鋁腐蝕。腐蝕鈍化膜的形成及熱處理后合金各相成分趨于一致，均使合金耐腐蝕性能得到改善。
關(guān)鍵字: 鋁青銅；腐蝕；耐蝕性能；腐蝕速率；脫鋁
5.0% H2SO4 solution
（State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials,
Lanzhou University of Technology, Lanzhou 730050, China）
Abstract: The corrosion resistance and behaviors of Cu-14Al-X bronze alloy in 5.0% H2SO4 solution were investigated by using static immersing corrosion and electrochemistry test, X-ray diffraction, scanning electron microscope, X-ray photo-electron spectroscopy and electron probe micro-analyzer. The results show that the corrosion resistance of Cu-14Al-X alloy is well in H2SO4 solution. The (α+γ2) phase suffers a dealuminization attack superior to β′ phase, α phase and κ phase. The passivation patinas and the composition of each phases becoming more homogeneous are moderator to the dealuminization corrosion of high aluminum bronze.
Key words: aluminum bronze; corrosion; corrosion resistance; corrosion rate; dealuminization
