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The formation mechanism and biocorrosion property of CaSiO 3 /CaHPO 4 · 2H 2 O composite conversion coating on the extruded Mg‐Zn‐Ca alloy for bone implant application·
Author(s) -
Wei Zunjie,
Du Hui,
Zhang Erlin
Publication year - 2011
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.3625
Subject(s) - materials science , composite number , coating , diffractometer , alloy , chemical engineering , calcium silicate , magnesium , nuclear chemistry , metallurgy , composite material , scanning electron microscope , chemistry , engineering
In this work, a calcium silicate and calcium phosphate (CaSiO 3 /CaHPO 4 · 2H 2 O) composite coating was applied by a chemical reaction to an extruded Mg‐Zn‐Ca magnesium alloy. SEM observation showed that a flat and sand‐like conversion coating was formed. X‐ray diffractometer (XRD) analysis indicated that the conversion coating was composed of CaHPO 4 · 2H 2 O and a little amount of CaSiO 3 . The formation mechanism of CaSiO 3 /CaHPO 4 · 2H 2 O composite conversion coatings was discussed. The electrochemical polarization tests showed that the conversion coating markedly improved the biocorrosion resistance of Mg‐Zn‐Ca alloy in Hank's solution. Copyright © 2010 John Wiley & Sons, Ltd.