鮮曉斌， 郎定木， 董 平
( 中國工程物理研究院， 綿陽 621900)
摘 要: 研究了鈾表面磁控濺射離子鍍Ti/Al復(fù)合鍍層在200~500℃溫度范圍， 分別在0.05 MPa的O2、 H2O和HCl氣體中的腐蝕失效形式。 采用俄歇電子能譜（AES）分析了腐蝕后腐蝕介質(zhì)元素在復(fù)合鍍層中的深度分布，并采用有限元分析方法計(jì)算了在腐蝕加熱和冷卻過程中復(fù)合鍍層的應(yīng)力變化。 結(jié)果表明： O2、 H2O、 HCl引起鈾表面Ti/Al復(fù)合鍍層的反應(yīng)腐蝕溫度依次降低，界面分離是Ti/Al復(fù)合鍍層抗氣體加熱腐蝕的主要失效形式， Al/U和Ti/Al界面分別成為Ti/Al復(fù)合鍍層在含O氣氛和HCl氣體中加熱腐蝕的薄弱環(huán)節(jié)； 鍍層從界面剝離主要是腐蝕氣體從鍍層缺陷滲透到界面，降低界面的結(jié)合力， 從而產(chǎn)生應(yīng)力引起的。
關(guān)鍵字: Ti/Al復(fù)合鍍層；鈾； 腐蝕； 界面； 應(yīng)力
（ Chinese Academy of Engineering Physics,
Mianyang 621900, China）
Abstract: The corrosive behavior of Ti/Al dual coating on uranium prepared by magnet-sputtering ion plating technique was investigated under the condition of 0.05MPa O2， H2O or HCl atmosphere at 200-500℃. The depth profile of corrosive elements in Ti coating was analyzed by Auger Electron Spectroscopy(AES). The stress distribution in the dual coatings was evaluated by the finite element method during rising and cooling processes. The reaction temperature of the Ti/Al dual coating with O2, H2O and HCl gases was found to be decreased. The Ti/Al dual coating on uranium was spalled at Al/U interface after hot corrosion in O2 and H2O atmosphere, and Ti coating was separated from Ti/Al interface in HCl atmosphere. Both Al/U and Ti/Al interfaces of the Ti/Al dual coating on uranium are the worst anti-corrosion region against O2, H2O and HCl gases. The stress leads to failure of the dual coating at the interface after O or Cl element diffuses into the interface and reacts with the metal.
Key words: Ti/Al dual coating; uranium; corrosion; interface; stress
