Study on Corrosion Behavior of Hot Extruded Mg-1Ca-0.5Mn Alloy in Sodium Chloride Water Solution

Ying Ma; Zhong Ming Zhang; Ting Wang; Yang Guo; Chun Jie Xu

doi:10.4028/www.scientific.net/AMM.268-270.330

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 268-270Study on Corrosion Behavior of Hot Extruded...

Study on Corrosion Behavior of Hot Extruded Mg-1Ca-0.5Mn Alloy in Sodium Chloride Water Solution

Abstract:

The corrosion behavior of extruded Mg-1Ca-0.5Mn（weight percent）alloy in 0.9% sodium chloride water solution was investigated by using mass-loss measurement and electrochemical method. The results show that filiform corrosion and pitting corrosion occur during immersion corrosion process. The average corrosion rate gradually decreases as immersion time increases; it is 0.53 mm/a after immersion at 37°C for 11 days. The corrosion current density i_corr and corrosion potential E_corr of the alloy is 0.042 mA/cm² and -1.60V, respectively. The instantaneous corrosion rate is 0.88 mm/a. Mg-1Ca-0.5Mn alloy erodes by continuous dissolution. The corrosion product Mg(OH)₂ layer surrounding the magnesium alloy can decrease the corrosion rate. The erosion process of the magnesium alloy is controlled by cathodic diffusion.

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Periodical:

Applied Mechanics and Materials (Volumes 268-270)

Pages:

330-335

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.268-270.330

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Online since:

December 2012

Authors:

Ying Ma, Zhong Ming Zhang, Ting Wang, Yang Guo, Chun Jie Xu

Keywords:

Corrosion, Magnesium Alloy, Mass Loss, NaCl Solution, Polarization Curve

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