《Table 4 EDS results of the areas marked in Fig.8 (at%)》

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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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Fig.8 shows the SEM micrographs of the specimens.The chemical components of the corresponding areas in Fig.8obtained by EDS are listed in Table 4.Fig.8a shows that the naked AZ31 is covered by a reaction layer and lots of cracks are found on the surface.Table 4 shows that besides Mg and O，significantly high contents of P（7.18 at%）and Ca（6.11 at%）on area 1 are detected，which means that calcium phosphate is formed while the Mg substrate is corroded.Specimens treated at pH=6 and pH=10 show that most of the coating are intact except a very small part of the coating damaged（marked in area 2 and area 6）.EDS results on these damaged areas show a significantly high contents of P and Ca compare with the substrate（area 1）.The reason may be that there is an ionic bond of Mg2+and PO43–at the interface between the initial sediments and the AZ31 substrate，which will cause a strong combination of the inner calcium phosphate layer.Fig.8c shows the corrosion spots of the pH=8-treated specimen（marked in Fig.7c），suggesting that part of the HA layer has fallen off and a large amount of Mg（21.26 at%）and 1.76 at%Al are detected（marked in area 4）.