Jia Zheng, Sheng-tao Zhang, Lei Guo, Tang-man Lv, Yang Zhou, Xiao-fang Luo. pH Influence on Performance of Phytic Acid Conversion Coatings on AZ31 Magnesium Alloy in Simulated Body Fluid[J]. Chinese Journal of Chemical Physics , 2014, 27(5): 535-540. doi: 10.1063/1674-0068/27/05/535-540
Citation: Jia Zheng, Sheng-tao Zhang, Lei Guo, Tang-man Lv, Yang Zhou, Xiao-fang Luo. pH Influence on Performance of Phytic Acid Conversion Coatings on AZ31 Magnesium Alloy in Simulated Body Fluid[J]. Chinese Journal of Chemical Physics , 2014, 27(5): 535-540. doi: 10.1063/1674-0068/27/05/535-540

pH Influence on Performance of Phytic Acid Conversion Coatings on AZ31 Magnesium Alloy in Simulated Body Fluid

doi: 10.1063/1674-0068/27/05/535-540
Funds:  This work was supported by the National Natural Science Foundation of China (No.21376282).
  • Received Date: 2014-04-14
  • Phytic acid (PA) conversion coating on AZ31 magnesium alloy is prepared by a deposition method. pH influences on the formation process, microstructure and properties of the conversion coating are investigated. Electrochemical tests including polarization curve and electrochemical impedance spectroscopy are used to examine the corrosion resistance, and scanning electron microscopy is used to observe the microstructure. The chemical nature of conversion coating is investigated by energy dispersive spectroscopy. And thermodynamic method is used to analyze the optimum pH. The results show that PA conversion coating can improve the corrosion resistance of AZ31 Mg alloy. The maximum efficiency achieves 89.19% when the AZ31 Mg alloy is treated by PA solution with pH=5. It makes the corrosionpotential of sample shift positively about 156 mV and corrosion current density is nearly an order of magnitude less than that of the untreated sample. The thermodynamic analysis shows that the corrosion resistance of PA coatings is affected by not only the concentration of PA ion and Mg2+ but also the release rate of hydrogen.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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pH Influence on Performance of Phytic Acid Conversion Coatings on AZ31 Magnesium Alloy in Simulated Body Fluid

doi: 10.1063/1674-0068/27/05/535-540
Funds:  This work was supported by the National Natural Science Foundation of China (No.21376282).

Abstract: Phytic acid (PA) conversion coating on AZ31 magnesium alloy is prepared by a deposition method. pH influences on the formation process, microstructure and properties of the conversion coating are investigated. Electrochemical tests including polarization curve and electrochemical impedance spectroscopy are used to examine the corrosion resistance, and scanning electron microscopy is used to observe the microstructure. The chemical nature of conversion coating is investigated by energy dispersive spectroscopy. And thermodynamic method is used to analyze the optimum pH. The results show that PA conversion coating can improve the corrosion resistance of AZ31 Mg alloy. The maximum efficiency achieves 89.19% when the AZ31 Mg alloy is treated by PA solution with pH=5. It makes the corrosionpotential of sample shift positively about 156 mV and corrosion current density is nearly an order of magnitude less than that of the untreated sample. The thermodynamic analysis shows that the corrosion resistance of PA coatings is affected by not only the concentration of PA ion and Mg2+ but also the release rate of hydrogen.

Jia Zheng, Sheng-tao Zhang, Lei Guo, Tang-man Lv, Yang Zhou, Xiao-fang Luo. pH Influence on Performance of Phytic Acid Conversion Coatings on AZ31 Magnesium Alloy in Simulated Body Fluid[J]. Chinese Journal of Chemical Physics , 2014, 27(5): 535-540. doi: 10.1063/1674-0068/27/05/535-540
Citation: Jia Zheng, Sheng-tao Zhang, Lei Guo, Tang-man Lv, Yang Zhou, Xiao-fang Luo. pH Influence on Performance of Phytic Acid Conversion Coatings on AZ31 Magnesium Alloy in Simulated Body Fluid[J]. Chinese Journal of Chemical Physics , 2014, 27(5): 535-540. doi: 10.1063/1674-0068/27/05/535-540

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