Microstructure, mechanical, and corrosion properties of extruded low-alloyed Mg-xZn-0.2Ca alloys

Microstructure, mechanical and corrosion properties of novel quaternary biodegradable extruded Mg–1Zn–0.2Ca-xAg alloys

“…The standard electrode potential of the Ag element is +0.7996 V while Mg is −2.375 V [45]. Therefore, it can be inferred that one of the reasons why 1Ag alloy has a lower corrosion rate is that Ag, as a solution element in the α-Mg matrix, enhances the standard electrode potential of the alloys [3,18]. For further analysis of the corrosion mechanism, the 3-D Volta potential map and the corresponding line data of 0Ag, 1Ag, and 4Ag from SKPFM are performed in figure 10, respectively.…”

“…Although the extruded REcontaining alloys exhibited better performance in the mechanical properties in particular, for instance, Mg-2.4Zn-0.8Gd alloy with a tensile yield strength (TYS) of 284 MPa and ultimate tensile strength (UTS) of 338 MPa [14], RE-free Mg alloys are more competitive for commercial utilization because of the biosafety [15]. According to our recent investigations [16][17][18], Mg-1.0Zn-0.2Ca alloy is promising as the base alloy for further alloy development if considering comprehensive mechanical and corrosion properties although its mechanical properties are still not enough for medical application.…”

Attaining High Functional Performance in Biodegradable Mg-Alloys: An Overview of Challenges and Prospects for the Mg-Zn-Ca System

“…Corrosion products are chemically removed from the corroded surface using standard solutions, the recipes of which are given in ASTM G1-03 [ 170 ]. For the Mg-Zn-Ca alloys, the water solution of CrO 3 [ 145 , 146 , 171 , 172 ] is most commonly used. The solution of CrO 3 (from 18% [ 148 ] to 20% [ 173 ]) with the addition of AgNO 3 (from 0.1% [ 148 ] to 1% [ 173 ]) is also proven to be efficient, particularly if the cleaning is performed in an ultrasonic bath.…”

“…The alloy with this amount of calcium also demonstrates a pronounced increase in the corrosion rate: while the increase in the corrosion rate as the calcium concentration increased from 0.2% to 0.4% was only ~1.5 times, the corrosion rate of the alloy with 0.8% Ca was four times higher than that in the alloy with 0.2% Ca. It has been indicated that other intermetallic compounds are formed instead of Mg 2 Ca in Mg-Zn-Ca alloys at specific zinc contents, ultimately affecting the overall corrosion resistance [ 172 , 193 ]. X-ray diffraction analysis showed that, as the Zn content exceeded 1%, the Ca 2 Mg 6 Zn 3 phase was formed instead of Mg 2 Ca [ 146 ].…”

Effects of Gd and heat treatments on mechanical properties of Mg-xGd-1Zn-0.4Zr alloys

“…Alloying and heat treatment are the *Corresponding author: e-mail addresses: xbxbzhang2003@163.com , xbzhang@njit.edu.cn common methods to improve mechanical properties of magnesium alloys. It has been reported that Zn, Ca, Sr, Zr, et al can significantly strengthen biomedical magnesium alloys mainly due to solution strengthening and grain refinement strengthening [10][11][12][13]. Solid solution treatment makes the alloying elements dissolve into matrix, and thus leads to solution strengthening [14].…”