摘要
为了揭示Mg元素对Al合金作阴极时电化学特性及耐蚀性能的影响,制备了不同Al含量的Al-Mg合金。采用线性扫描伏安法、电化学阻抗测试、塔菲尔曲线测试和稳态恒电流极化及腐蚀失重法研究了其电化学和腐蚀性能。结果表明:以Al-Mg合金作阴极电极析出的电位比纯铝材降低40 m V,2.0%Mg时Al-Mg合金析氢过电位最大(0.836 m V),3.0%Mg时零电势下表观交流电流密度达到1.441×10-12A/cm2,Al-Mg合金电极的电催化活性显著提高;整个电极反应过程稳定性不受影响,电化学过程表现为同一种步骤控制; Mg的添加会增加Al-Mg合金的腐蚀速率,使耐蚀性降低,故其不适合单独作为添加元素使用。
In order to reveal the effect of Mg element on the electrochemical performance and corrosion resistance of Al alloy as cathode, Al- Mg alloys with various Al contents were prepared. The linear sweep voltammetry （LSV）, electrochemical impedance spectroscopy （EIS）, Tafel curve test, steady state galvanostatic polarization and immersion experiment were used to study the electrochemical performance of the prepared alloys. Results showed that the adding of Mg element could reduce the precipitation potential of the electrode reaction by 40 mV, and the maximum hydrogen over potential was 0.836 mV at 2.0% Mg content. When Mg contents was 3.0%, the apparent exchange current density was up to 1.441×10^-12A/cm^2, and the electrocatalytic activity was improved significantly. Moreover, after adding the Mg element, the overall stability of the electrodes was not affected, and the electrochemical process presented the same step control. Adding Mg element led to the increase of the corrosion rate, deteriorating the corrosion resistance of Al-Mg alloy, and therefore, Mg element was not suitable for use as an added element alone.
作者
张小军
黄惠
赵丹丹
董劲
郭忠诚
ZHANG Xiao-jun;HUANG Hui;ZHAO Dan-dan;DONG Jin;GUO Zhong-cheng(Faculty of Metallurgical and Energy Engineering,4.Faculty of Managemem and Economics,Kunming University of Science and Technology,Kunming 650093,China;Yunnan Provincial Engineering Technology Research Center of Metallurgical Electrode Materials,Kunming 650106,China;Kunming Hendera Science and Technology Co.,Ltd.,Kunming 650106,China)
出处
《材料保护》
CAS
CSCD
北大核心
2018年第8期10-14,41,共6页
Materials Protection
基金
国家自然科学基金资助项目(51504111)
云南省自然科学基金资助项目(20113FA012
20113FB022)
