Study on Inhibition of Self‐Aging Behavior of Zn–Ag Alloy by Hyperpressure Solution and Artificial Aging Treatment

The hyperpressure solution (HS) is used on Zn‐16Ag alloy to break the limit of atmospheric solid solution, and then the precipitation heat treatment is performed for 8 h at 100 °C. The X‐ray diffraction pattern of HS Zn‐16Ag alloy exhibits no obvious second phase peaks, the dispersive AgZn 3 phases precipitate after precipitation heat treatment. The tensile strength of AS‐2 (atmospheric pressure solid solution–precipitation heat treatment–rolling) and HS‐2 (HS solid solution–precipitation heat treatment–rolling) Zn‐16Ag is 296 and 256 MPa, with elongation of 38% and 59%, respectively. After natural aging, the tensile strength of AS‐2 samples decreases by 25.6%, whereas that of HS‐2 samples only decreases by 2%. The fine diffusion AgZn 3 precipitated inhibits the growth and dynamic recrystallization of the grains, showing excellent resistance of self‐aging. Moreover, HS‐2 Zn‐16Ag exhibits a more uniform corrosion mode than the AS‐2 alloy after immersion tests.