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| EFFECT OF SMALL ADDITION OF STRONTIUM ONMICROSTRUCTURE AND ELECTROCHEMICALPERFORMANCE OF Mg-Mn SACRIFICIAL ANODE |
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| 郑州大学材料学院 |
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Abstract The effect of small addition of strontium on the microstructures and electrochemical performances was investigated by optical microscope (OM),X-ray diffractometer(XRD),scanning electron microscope (SEM),energy dispersive spectrometer (EDS)and electrochemical methods.The results show that the crystal grains are diminished with the small addition of Sr and the average grain size decreases from 900 μm to 80 μm when the Sr addition varies from 0 to 0.30%.When the addition of Sr is less than 0.1%,the efficiency is improved,and the open potential shifts negatively.The efficiency and the open potential of the anode will meet the peak values simultaneously with 0.1% Sr additio
n which are 54.5% and -1.73VSCE.However,when the Sr addition is more than 0.1%,the efficiency is remarkably decreased,and the open potential shifts notably.
The reasons that Sr addition affects the efficiency and the potential are mainly attributed to:(1)when the Sr addition is less than 01%,the microgalvanic cells
which are established by the Mg17Sr2 phase(cathode) and theα-Mg matrix(anode),reduce the intergranular corrosion diminishing the particles falling and the efficiency increases.The refined microstructures by small Sr addition increasing the grain boundary areas induce more uniform distribution of the impurities,and the open potential shifts negatively;(2)when the Sr addition is more than 0.1%,more Mg17Sr2 phase pasticles act as the cathode,which increases the corrosion along the grain boundaries and the efficiency drops and the open potential shifts notably.
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Received: 05 September 2005
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