Corrosion behavior of Mg₆₅Cu_25−xZn _xGd₁₀ (x=0, 5) metallic glass

Abstract

The effect of substitutional element Zn on corrosion behavior of Mg₆₅Cu₂₅Gd₁₀ glass was investigated. The amorphous structure of Mg₆₅Cu_25−x Zn _xGd₁₀ (x=0, 5) alloys were examined by X-ray diffractometry and differential scanning calorimetry (DSC). The dissolution rates of Mg₆₅Cu_25−xZn _xGd₁₀ (x=0, 5) metallic glasses in a 5 wt% NaCl solution with pH value of 7 were determined by a hydrogen evolution testing method. The corrosion behavior of these alloys was characterized using dipping tests with 5 wt% NaCl, in combination with electrochemical measurements and scanning electron microscopy (SEM). Results show that the anti-corrosion ability of Mg₆₅Cu₂₅Gd₁₀ alloy is significantly improved due to the addition of Zn. Possible mechanism responsible for the improvement is discussed.

Keywords

Mg-based metallic glass / corrosion behavior / corrosion resistance / dissolution rate

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