论文部分内容阅读
为改善镁合金的耐蚀性和生物相容性,以氟处理的AZ31镁合金为基体,通过Ca(OH)2处理后使其表面改性,用电化学沉积法在其表面制备了Ca-P涂层。通过SEM、EDS、XRD和FTIR分析了涂层的形貌、化学成分和相组成。结果表明:经HF酸处理后,镁合金表面形成具有微孔的氟转化层,氟转化层在Ca(OH)_2溶液浸泡后形成具有微纳米孔隙的CaF_2层;相比于未经Ca(OH)_2处理的氟转化膜表面,具有微纳米孔隙的富钙层更有利于诱导含磷基团和钙离子的形核,电化学沉积所得的Ca-P涂层更致密均匀,晶体结晶更完整;电化学沉积后的涂层由长约70μm、宽约30μm的片状透钙磷石(DCPD,CaHPO_4·2H_2O)晶体组成,碱热处理后涂层表面形成大量绒毛状物质,DCPD转变为HA,HA涂层也是由呈花簇状生长的片状晶体构成。
In order to improve the corrosion resistance and biocompatibility of magnesium alloy, the surface of AZ31 magnesium alloy treated with Ca (OH) 2 was modified by fluorine-treated AZ31 magnesium alloy. Electrochemical deposition was used to prepare Ca- P coating. The morphology, chemical composition and phase composition of the coatings were analyzed by SEM, EDS, XRD and FTIR. The results showed that the fluoride conversion layer with micropores was formed on the surface of magnesium alloy by hydrofluoric acid treatment. The fluoride conversion layer formed CaF_2 layer with micro / nano pores after immersed in Ca (OH) 2 solution. ) _2 treatment of fluorine conversion film surface, with a micro-nano-pore calcium-rich layer is more conducive to induce phosphorus-containing groups and the nucleation of calcium ions, the electrochemical deposition of Ca-P coating is more uniform and more uniform crystalline crystals (DCPD, CaHPO 4 · 2H 2 O) crystals about 70μm in length and 30μm in width. After the alkali heat treatment, a large amount of fluffy substance was formed on the surface of the coating, and the DCPD was changed to HA, The HA coating is also composed of flaky crystals that grow in clusters of flowers.