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The influence of volume fraction of amorphous phase on corrosion resistance of Mg 67 Zn 29 Ca 4 alloy
Author(s) -
Chlewicka Monika,
Cieślak Grzegorz,
Mizera Jarosław
Publication year - 2019
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201910821
Subject(s) - materials science , corrosion , differential scanning calorimetry , amorphous solid , alloy , amorphous metal , scanning electron microscope , volume fraction , phase (matter) , metallurgy , thermal analysis , microstructure , chemical engineering , composite material , crystallography , chemistry , thermal , organic chemistry , thermodynamics , physics , engineering
The aim of this study was to investigate the structure and corrosion resistance of amorphous, amorphous‐crystalline, and crystalline Mg 67 Zn 29 Ca 4 alloy for biodegradable applications. This paper presents a preparation method and results of the structural characterization and corrosion resistance analysis of the material. Samples were prepared in the form of 3 mm diameter rods. The structure of the alloy was examined with the use of X‐ray diffractometry and scanning electron microscopy. The thermal properties of the samples were examined with differential scanning calorimetry (DSC). Results of DSC analysis were used to determine heat treatment temperatures, allowing to obtain different fractures of crystalline phase in the material. Corrosion resistance of heat‐treated samples was investigated by immersion tests and electrochemical measurements performed in the simulated body fluid. The X‐ray diffraction results confirmed that the prepared Mg 67 Zn 29 Ca 4 alloy's structure is fully amorphous. After heat treatment, samples with different fractions of amorphous phase in the structure were obtained. Immersion tests of the samples showed that the structure significantly influenced corrosion resistance in examined materials. It should be pointed out, that certain amounts of crystalline phase in amorphous matrix can greatly improve the corrosion resistance of Mg 67 Zn 29 Ca 4 alloy.