The Experts below are selected from a list of 25833 Experts worldwide ranked by ideXlab platform
F. Liu - One of the best experts on this subject based on the ideXlab platform.
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Microstructure evolution and Corrosion Mechanism of dicalcium phosphate dihydrate coating on magnesium alloy in simulated body fluid
Materials Chemistry and Physics, 2009Co-Authors: Changyong Wang, W.c. Ren, Su Zhang, F. LiuAbstract:Dicalcium phosphate dihydrate (DCPD) coating was deposited on the substrate surface of magnesium alloy with solution treatment. The microstructures and Corrosion behaviors of the DCPD-coated samples before and after immersion in simulated body fluid (SBF) for different times were investigated. It is important to note that DCPD was not only transformed into hydroxyapatite (HA) but also induced HA precipitation after immersion in SBF. An HA-like coating was generated on the substrate surface in a two step process involving an initial coating with DCPD, resulting in the Corrosion resistance increasing along with the Corrosion Mechanism changing with increase to soaking time.
Jeong Kil Kim - One of the best experts on this subject based on the ideXlab platform.
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new findings on intergranular Corrosion Mechanism of stabilized stainless steels
Electrochimica Acta, 2011Co-Authors: Jeong Kil Kim, Yeong Ho Kim, Bong Ho Lee, Kyoo KimAbstract:Number of different sets of stabilized both ferritic and austenitic stainless steels with various alloying elements were evaluated to verify new findings on the intergranular Corrosion Mechanism. The intergranular segregation and precipitation were analyzed by using a transmission electron microscopy with an energy dispersive X-ray spectroscopy and a laser assisted three-dimensional atom probe. On the basis of the current result, it is newly proposed that the intergranular Corrosion occurring in the stabilized both ferritic and austenitic stainless steels is induced by Cr-depletion due to segregation of un-reacted Cr atoms around carbides of stabilizer elements (Ti or Nb) along the grain boundary, but not due to formation of Cr-carbide. A prevention method for this type of intergranular Corrosion is also suggested after critical evaluation on the effect of Cr, C, and Ni.
Yuanjun Guo - One of the best experts on this subject based on the ideXlab platform.
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Corrosion Mechanism and model of pulsed dc microarc oxidation treated az31 alloy in simulated body fluid
Applied Surface Science, 2012Co-Authors: Chengfu Chen, Sukumar Bandopadhyay, Chengyun Ning, Yongjun Zhang, Yuanjun GuoAbstract:Abstract This paper addresses the effect of pulse frequency on the Corrosion behavior of microarc oxidation (MAO) coatings on AZ31 Mg alloys in simulated body fluid (SBF). The MAO coatings were deposited by a pulsed DC mode at four different pulse frequencies of 300 Hz, 500 Hz, 1000 Hz and 3000 Hz with a constant pulse ratio. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests were used for Corrosion rate and electrochemical impedance evaluation. The corroded surfaces were examined by X-ray diffraction (XRD), X-ray fluorescence (XRF) and optical microscopy. All the results exhibited that the Corrosion resistance of MAO coating produced at 3000 Hz is superior among the four frequencies used. The XRD spectra showed that the Corrosion products contain hydroxyapatite, brucite and quintinite. A model for Corrosion Mechanism and Corrosion process of the MAO coating on AZ31 Mg alloy in the SBF is proposed.
Changyong Wang - One of the best experts on this subject based on the ideXlab platform.
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Microstructure evolution and Corrosion Mechanism of dicalcium phosphate dihydrate coating on magnesium alloy in simulated body fluid
Materials Chemistry and Physics, 2009Co-Authors: Changyong Wang, W.c. Ren, Su Zhang, F. LiuAbstract:Dicalcium phosphate dihydrate (DCPD) coating was deposited on the substrate surface of magnesium alloy with solution treatment. The microstructures and Corrosion behaviors of the DCPD-coated samples before and after immersion in simulated body fluid (SBF) for different times were investigated. It is important to note that DCPD was not only transformed into hydroxyapatite (HA) but also induced HA precipitation after immersion in SBF. An HA-like coating was generated on the substrate surface in a two step process involving an initial coating with DCPD, resulting in the Corrosion resistance increasing along with the Corrosion Mechanism changing with increase to soaking time.
Kyoo Kim - One of the best experts on this subject based on the ideXlab platform.
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new findings on intergranular Corrosion Mechanism of stabilized stainless steels
Electrochimica Acta, 2011Co-Authors: Jeong Kil Kim, Yeong Ho Kim, Bong Ho Lee, Kyoo KimAbstract:Number of different sets of stabilized both ferritic and austenitic stainless steels with various alloying elements were evaluated to verify new findings on the intergranular Corrosion Mechanism. The intergranular segregation and precipitation were analyzed by using a transmission electron microscopy with an energy dispersive X-ray spectroscopy and a laser assisted three-dimensional atom probe. On the basis of the current result, it is newly proposed that the intergranular Corrosion occurring in the stabilized both ferritic and austenitic stainless steels is induced by Cr-depletion due to segregation of un-reacted Cr atoms around carbides of stabilizer elements (Ti or Nb) along the grain boundary, but not due to formation of Cr-carbide. A prevention method for this type of intergranular Corrosion is also suggested after critical evaluation on the effect of Cr, C, and Ni.
