摘要
In order to evaluate the electrochemical properties of aluminum alloy anode under high current densities in alkaline electrolyte, the galvanostatic discharge, potentiodynamic polarization and hydrogen evolution tests of three experimental Al?Mg?Sn?In?(Ga) alloys were performed. The results show that the alloying element gallium improves the working potentials of experimental Al?Mg?Sn?In alloys under different discharge current densities. The average working potentials of the alloys containing gallium can reach?1.3 V under current density ranging from 650 to 900 mA/cm2, while those of alloy without Ga are only?1.0 V. Such phenomenon is attributed to the solid solution which can form amalgam with aluminum matrix. Such an amalgam can form the hydrolyzed species during the discharge process and lead to the corrosion infiltrating into aluminum matrix.
采用恒电流放电、动电位极化和析氢方法测试待测Al-Mg-Sn-In-Ga合金在碱性介质中、高放电电流密度下的电化学性能。结果表明,合金元素镓能够使Al-Mg-Sn-In合金在不同电流密度下的工作电位变负,含镓的铝合金在电流密度为650~900 mA/cm^2时的放电电位可达-1.3 V,而不含镓的Al-Mg-Sn-In合金的放电电位大于-1.0 V。这是由于镓与铝基体形成固溶体,并在放电过程中形成汞齐,使腐蚀深入到铝基体内部。
基金
Project supported by the Open Fund of the State Key Laboratory of Powder Metallurgy,China
