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Advanced Mg‐Mn‐Ca sacrificial anode materials for cathodic protection
Author(s) -
Kim J.G.,
Kim Y.W.
Publication year - 2001
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 - 10.1002/1521-4176(200102)52:2<137::aid-maco137>3.0.co;2-3
Subject(s) - cathodic protection , galvanic anode , anode , materials science , manganese , metallurgy , chemistry , electrode
Addition of calcium to the Mg‐Mn sacrificial anodes enhanced the anode efficiency by promoting the uniformly distributed corrosion along the grain boundaries and increased the driving potential by intrinsic electronegative potential of α‐Mg. The reason for the uniform intergranular corrosion is that Mg 2 Ca precipitate (cathode) at grain boundaries is galvanically coupled to α‐Mg matrix (anode). Larger anodic area limits the localized nature of the intergranular attack.