Effect of rare earths on corrosion resistance of Cu-30Ni alloys in simulated seawater
来源期刊：Journal of Rare Earths2009年第6期
论文作者：毛向阳 方峰 蒋建清 谈荣生
文章页码：1037 - 1041
摘 要：Cu-30Ni-xRE（x=0-0.213 wt.%） alloy was prepared by adding rare earths（RE） in melted Cu-30Ni alloy using metal mould casting method.The effects of RE on corrosion resistance of the alloy in simulated seawater were investigated using optical microscope,scanning electronic microscope with energy-dispersive spectrometer and electrochemical measurement system.The results showed that the corrosion resistance of Cu-30Ni alloy was greatly improved by adding proper amount of RE,whereas excess addition of RE worsened the corrosion resistance.The optimum RE content was about 0.095 wt.%.In comparison with the alloy without RE,the corrosion potential and corrosion current density of Cu-30Ni alloy containing proper RE decreased by about -40 mV and 0.47 μA/cm2,respectively.The roles of RE purifying the impurities and decreasing Ni element segregation,which resulted in the decrease of galvanic cell and corrosion potential gradient in Cu-30Ni alloy,were responsible for the improvement of corrosion resistance.
毛向阳，方峰，蒋建清，谈荣生
Jiangsu Key Laboratory of Advanced Metallic Materials,School of Materials Science and Engineering,Southeast University
摘 要：Cu-30Ni-xRE（x=0-0.213 wt.%） alloy was prepared by adding rare earths（RE） in melted Cu-30Ni alloy using metal mould casting method.The effects of RE on corrosion resistance of the alloy in simulated seawater were investigated using optical microscope,scanning electronic microscope with energy-dispersive spectrometer and electrochemical measurement system.The results showed that the corrosion resistance of Cu-30Ni alloy was greatly improved by adding proper amount of RE,whereas excess addition of RE worsened the corrosion resistance.The optimum RE content was about 0.095 wt.%.In comparison with the alloy without RE,the corrosion potential and corrosion current density of Cu-30Ni alloy containing proper RE decreased by about -40 mV and 0.47 μA/cm2,respectively.The roles of RE purifying the impurities and decreasing Ni element segregation,which resulted in the decrease of galvanic cell and corrosion potential gradient in Cu-30Ni alloy,were responsible for the improvement of corrosion resistance.
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