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Effect of CeO2 AdditionSon Interface Structure and Corrosion Resistance of Laser Additive Manufacturing on the Surface of Al Alloys
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Guilin University of Electronic Technology,Guilin University of Electronic Technology,Guilin University of Electronic Technology

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    Abstract:

    Ni60 alloy layers with different contends of rare-earth CeO2 were prepared on the surface of 6063 aluminum alloy by using laser additive manufacturing. The effects of rare earth CeO2 addition on microstructure, phase structure and corrosion resistance of bonding interface between Ni60-CeO2 alloy layers and substrate were investigated by means of OM, XRD,SEM and electrochemical corrosion tester. The results show that on the surface morphology, 4%~5% CeO2+Ni60 alloy layers have the best morphology, it is difficult to obtain a good alloy layer when the CeO2 content of less than 3% . It is less surface pores, shedding and other defects when CeO2 contents of 5% to 10% . On the cross-section morphology, the alloy layers prone to cracking at 0% to 2% CeO2 content, the main defect is porosity when the content of 5% to 10%, 4% CeO2 Ni60 alloy layer have no obvious pores and cracks, with a relatively good cross-section morphology. Adding 4% CeO2 can improve the organizational structure of Ni60 alloy layer, promote grain refinement and compositions evenly distributed. Adding different contents of CeO2 can improve aluminum surface morphology in Ni60 alloy layers, the preferred amount of rare earth CeO2 is add 4% CeO2. Electrochemical corrosion tests show that, the corrosion resistance of CeO2 Ni60 alloy layer was 4.25 times as that of Ni60 alloy layer in 1mol/L H2SO4 solution. In 3.5% NaCl solution, the corrosion resistance of CeO2 Ni60 alloy layer was 1.4 times as that of Ni60 alloy layer. In 1mol/L NaOH solution, the corrosion resistance of CeO2 Ni60 alloy layer was 1.43 times as that of Ni60 alloy layer.

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[Wang Chenglei, Gao Yuan, Zhang Guangyao. Effect of CeO2 AdditionSon Interface Structure and Corrosion Resistance of Laser Additive Manufacturing on the Surface of Al Alloys[J]. Rare Metal Materials and Engineering,2017,46(8):2306~2312.]
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History
  • Received:April 08,2015
  • Revised:February 09,2017
  • Adopted:February 13,2017
  • Online: November 16,2017
  • Published: