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Corrosion and electrochemical behavior of Zn-Cu-Ti alloy added with La in 3% NaOH solution

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Abstract

The corrosion mechanism of Zn-Cu-Ti alloy added with La in 3% NaOH solution was investigated by electrochemical testing and SEM observation. Polarization curves manifested that the overall corrosion kinetics of alloys are under anodic control. The anodic passivation of the Zn-Cu-Ti alloy is remarkably improved by the addition of La. Because La can effectively improve the hydrogen evolution/oxygen reduction over-potential of alloy elements, and the rare earth oxide film plays an important role in insulation that can strengthen the dielectric properties of Zn-Cu-Ti alloy, the corrosion resistance of Zn-Cu-Ti alloy is made significantly better by adding a trace amount of La. The improvement of corrosion resistance is not positively correlated with the adding amount of La to alloy. The Zn-Cu-Ti-0.5La alloy displays the best corrosion resistance behavior. The corrosion form of the alloys mainly belongs to a selective corrosion and the main solid corrosion products are Zn(OH)2 and ZnO.

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Authors and Affiliations

  1. Faulty of Materials Science and Engineering, Xi’an University of Technology, Xi’an, 710048, China

    Shengya Ji  (冀盛亚), Shuhua Liang & Qing Wang

  2. School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang, 471023, China

    Shengya Ji  (冀盛亚) & Kexing Song  (宋克兴)

  3. Department of Materials Engineering, Henan Institute of Technology, Xinxiang, 453003, China

    Shengya Ji  (冀盛亚)

Authors
  1. Shengya Ji  (冀盛亚)
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  2. Shuhua Liang
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  3. Kexing Song  (宋克兴)
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  4. Qing Wang
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Corresponding author

Correspondence to Kexing Song  (宋克兴).

Additional information

Funded by the State Key Program of National Natural Science Foundation of China(No.U1502274), the Innovation Scientists and Technicians Troop Construction Projects of Henan Province (No.C20150014), the Program for Innovation Research Team (in Science and Technology) in University of Henan Province (No.14IRTSTHN007), and the Key Scientific Program of Henan Province(No. 16A430004)

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Ji, S., Liang, S., Song, K. et al. Corrosion and electrochemical behavior of Zn-Cu-Ti alloy added with La in 3% NaOH solution. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 31, 408–416 (2016). https://doi.org/10.1007/s11595-016-1384-x

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  • DOI: https://doi.org/10.1007/s11595-016-1384-x

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