《Table 2 Parameters obtained from the polarization curves in Fig.3》

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《pH值对镁合金表面水热沉积磷酸钙涂层微观形貌和腐蚀性能的影响（英文）》

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The polarization curves of specimens in Hank&apos；s solution are shown in Fig.3.The electrochemical parameters fitted from the polarization curves are listed in Table 2.The polarization curves of all the coated samples display distinct passivation regions.Although the Ecorr（corrosion potential）values of the hydrothermally treated specimens are lower than that of the AZ31 substrate，the Ebk（breakdown potential）is much higher than that of the AZ31 substrate，which indicates that the hydrothermally deposited coatings provide effective protection for magnesium alloys.Table 2 shows that the icoor（corrosion current density）of the pH=6-treated specimen is very close to that of the AZ31 substrate.While the icoor values of the pH=8 and pH=10-treated specimens are nearly 10 times lower than that of the AZ31 substrate.Among the hydrothermally treated specimens，the OCP coated specimen treated at pH=6 has the highest Ebk，indicating that the formed coating protects the substrate more effectively than the other two coated specimens.However，icoor of OCP coated specimens is the highest，which suggests that when the coating is broken，the corrosion rate will be faster than that of other coated specimens.The Ebk of pH=10-treated specimen is close to that of the pH=8-treated specimen，but the icoor is slightly lower.