Initial stages of corrosion within Mg-Zn-Y-Zr alloy in 1 g/l NaCl solution

• Published in: Journal of materials science Vol. 35; no. 1; pp. 1 - 8
• Main Authors: POPOV, I, STAROSVETSKY, D, SHECHTMAN, D
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 2000; Springer Nature B.V
• Subjects: Applied sciences; Casting alloys; Corrosion; Corrosion environments; Corrosion resistance; Corrosion resistant alloys; Exact sciences and technology; Grain boundaries; Heat treatment; Intermetallic phases; Magnesium; Materials science; Metals. Metallurgy; Pitting (corrosion); Sodium chloride; Solid solutions; Zinc; Zirconium base alloys; Corrosion resistance; Magnesium base alloys; Pitting corrosion; Polarization diagram; Heat treatment; Yttrium alloy; Microstructure; Sodium chloride; Zinc alloy; Cast alloy
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1023/A:1004734725783

Corrosion behavior of as-cast and heat treated Mg-Zn-Zr-Y alloy was studied in 1 g/l NaCl solution. The as-cast alloy was the least resistant to pitting corrosion. Its Mg-Zn solid solution matrix was the structural constituent responsible for corrosion susceptibility due to the presence of Zn-lean regions. Homogenization of the Zn distribution within the matrix significantly increased the corrosion resistance of the alloy. Grain boundaries, which contain intermetallic phases, were resistant to corrosion attack, thus impeding corrosion propagation.