Al-Zn-In-Mg-Ti阳极中Si杂质含量对其电化学性能的影响  

Effect of Silicon Impurity Content on Electrochemical Performance of Al-Zn-In-Mg-Ti Sacrificial Anode

作　　者：王树森[1] 梁成浩[1] 黄乃宝[1] 马力 吴建华 

机构地区：[1]大连海事大学交通运输装备与海洋工程学院,辽宁大连116026 [2]中船重工七二五研究所海洋腐蚀与防护重点实验室,山东青岛266101

出　　处：《材料保护》2014年第4期11-14,5,共4页Materials Protection

基　　金：国家高技术研究发展计划资助项目(2009AA05Z120)

摘　　要：目前,鲜见研究杂质元素含量对铝合金牺牲阳极性能影响的报道。浇铸了不同Si含量的Al-5.00Zn-0.02In-1.00Mg-0.05Ti-xSi-0.10Fe-0.01Cu(质量分数,%)铝合金阳极。采用电化学方法、电感耦合等离子体质谱仪(ICP-MS)和金相显微镜对不同Si含量阳极在海水中的形貌、Al,Zn元素溶解量及电化学性能进行了研究。结果表明:Si的加入改善了铝合金的组织均匀性,Al-5.00Zn-0.02In-1.00Mg-0.05Ti-0.09Si(%)铝合金中的等轴晶较多,阳极表面溶解均匀,电流效率达到92%以上;该合金阳极在0.1 mol/L NaCl溶液中浸泡2 h后的Al和Zn溶解量分别为23.00,4.40 g/L,在由海水和KI组成的溶液中浸泡2,48 h后的扫描电流峰值分别为27,36μA,耐蚀性较强。Al alloy sacrificial anodes with different Si impurity contents(coded as Al-5.00Zn-0.02In-1.00Mg-0.05Ti-xSi-0.10Fe-0.01Cu(mass fraction,%;the same hereafter)),were prepared by casting.The morphology of as- fabricated Al alloy anodes with different contents of Si in seawater was observed with a metallographic microscope;their electrochemical performances were measured with an electrochemical test rig,and their dissolved amounts of Al and Zn were determined by inductive coupled plasma-mass spectrometry.Results indicated that incorporating Si helped to improve the microstructure homogeneity of the Al alloy.Particularly,as- fabricated Al alloy containing 0.09%Si contained more equiaxed grains and dissolved uniformly,and its current efficiency was as much as 92%.Moreover,after this Al alloy was immersed in 0.1 mol/L NaCl solution for 2 h,its dissolved amounts of Al and Zn were 23.00 g/L and 4.40 g/L.Furthermore,after this Al alloy was immersed in seawater-KI solution for 2 h and 48 h,its peak current values were 27 μA and 36μA,respectively,showing improved corrosion resistance.

关 键 词：铝合金牺牲阳极 Si杂质 电化学性能 

分 类 号：O646[理学—物理化学]