Abstract
The effect of Ca on the microstructure and corrosion behavior of a single-phase Mg–Sc alloy was investigated. The microstructure was characterized by optical microscopy and scanning electron microscopy. Corrosion behavior was measured by hydrogen evolution tests and electrochemical measurements. With the addition of microalloyed Ca, the grain size of Mg-0.3Sc alloy is refined and the Mg2Ca phase particle is precipitated. The corrosion test results reveal that the addition of microalloyed Ca is beneficial to the corrosion resistance of Mg-0.3Sc single-phase alloy, which is related to the grain refinement and the protective performance of the corrosion product film. As the content of Ca increases, the corrosion resistance of the alloy first increases and then decreases, which is mainly related to the microstructure of the alloy.
Highlights
The presence of the second phase has a great influence on the corrosion behavior of magnesium (Mg) alloys [1,2,3,4]
The potential difference between the second phase and the matrix phase can lead to the generation of galvanic corrosion, which accelerates the corrosion of the Mg alloys [5,6,7]
Compared with multi-phase Mg alloys, single-phase Mg alloys can greatly avoid galvanic corrosion caused by the second phase, which is beneficial for the improvement of its corrosion resistance
Summary
The presence of the second phase has a great influence on the corrosion behavior of magnesium (Mg) alloys [1,2,3,4]. The potential difference between the second phase and the matrix phase can lead to the generation of galvanic corrosion, which accelerates the corrosion of the Mg alloys [5,6,7]. Song et al [8] considered that Mg is more negative than many typical second-phase particles, which makes the Mg matrix as the anode preferentially corrode. Compared with multi-phase Mg alloys, single-phase Mg alloys can greatly avoid galvanic corrosion caused by the second phase, which is beneficial for the improvement of its corrosion resistance. Sc possesses a relatively high hydrogen evolution overpotential, and its lattice parameter is very close to that of Mg, which may result in the high corrosion resistance of Mg–Sc alloys [10,11]
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