Effect of Alloying and Impurity Elements In Magnesium Alloy Cast Anodes

Mg and Its Alloys for Biomedical Applications: Exploring Corrosion and Its Interplay with Mechanical Failure

“…It increases the Fe tolerance level in Mg-Al alloys when keeping the Fe/Mn ratio at 0.032. The most likely mechanism explaining the moderation of Fe is that Fe is incorporated in an intermetallic AlMnFe compound, which is less active as local cathode, and thus reduces microgalvanic coupling [136,144]. However, Mn in concentrations higher than 10 µmol/L in the blood, has been shown to induce "Manganism", a neurological disorder similar to Parkinson's disease [145].…”

Reaction of zero-valent magnesium with water: Potential applications in environmental remediation

“…1.0% of Mn or Zn, both of which, on the contrary, raise the tolerance level of Ni to different extents. The mitigation of Mg corrosion by Fe in the presence of Mn is ascribed to Mn coating on Fe particles because Mg galvanic activity with Mn is less than that with Fe (Robinson and George, 1954). Actually, the sluggish Mg-water reaction is accelerated by using the metal milled with usually about 5% metallic iron (Fe), which is known to be the most common impurity in metallic Mg (Kuhn et al, 1984;Makar and Kruger, 1993;Taub et al, 2002).…”

Advanced Mg-Mn-Ca sacrificial anode materials for cathodic protection

“…The reason for the uniform intergranular corrosion is that Mg 2 Ca precipitate (cathode) at grain boundaries is galvanically coupled to a-Mg matrix (anode). Manganese, therefore, becomes a very important alloying element [6].Commercially used high manganese M1C (Mg-1Mn) anode has a potential of À 1.68 V SCE and an efficiency of 50% [7 ± 9]. Die Ursache fu Èr die gleichma Èûige interkristalline Korrosion ist, dass die Mg 2 Ca Ausscheidung (Kathode) an den Korngrenzen galvanisch mit der a-Mg-Matrix (Anode) verbunden ist.…”

“…However, magnesium anodes generally have a current efficiency below that of other galvanic anodes. Manganese, therefore, becomes a very important alloying element [6]. This compares unfavorably with zinc and aluminum anodes, which have current efficiency better than 90% [3].…”