(南京工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院， 南京 210009)
摘 要: 熔煉了添加合金元素Sb和Sn的5種Al-Zn-In系犧牲陽極材料， 采用恒電流方法測試了其電化學(xué)性能， 采用金相顯微鏡、 掃描電鏡和能譜分析分別觀察和分析了陽極材料的顯微組織和組成。結(jié)果表明： Sb具有細(xì)化晶粒的作用， 但晶界存在較多偏析相， 電流效率偏低； 與Sb相比較， Sn也具有細(xì)化晶粒的作用， 電流效率有所提高， 晶界偏析相較少，但陽極的表面腐蝕溶解不均勻； Sn和Sb的協(xié)同作用在于能有效地抑制Si的偏析， 顯著提高陽極的電流效率， 使得陽極表面具有良好的腐蝕溶解性。
關(guān)鍵字: 犧牲陽極；鋁合金； 銻； 錫
aluminum sacrificial anode materials
（ College of Materials Science and Engineering,
Nanjing University of Technology, Nanjing 210009， China）
Abstract: Five kinds of Al-Zn-In system sacrificial anode materials with different contents of Sb and Sn were cast. The electrochemical performance was tested with constant current method and microstructures were observed and analyzed by metallography microscope, scanning electron microscope and energy spectrum analysis. The results show that Sb addition can diminish the crystal grain, but the content of segregative phase at crystal boundary increases, and the current efficiency of material is low. Compared with Sb addition, Sn addition can also diminish the crystal grain, the current efficiency increases, the content of segregative phase at crystal boundary reduces, but diffusional corrosion of the anode surface is not uniform. The cooperation of Sb and Sn can prevent Si from segregating effectively and enhance the current efficiency obviously. At the same time, anode materials have preferable surface dissolution characteristics.
Key words: sacrificial anode； aluminum alloy； Sb； Sn
