發(fā)布時(shí)間：2018-09-17 14:30

【摘要】：對(duì)可生物降解二元Mg-6Zn合金進(jìn)行固溶處理,來評(píng)價(jià)獲得的顯微組織變化對(duì)合金降解速率的影響及其相關(guān)機(jī)理。在350°C條件下固溶處理6~48 h。采用光學(xué)顯微鏡、掃描電鏡、能量色散X射線光譜儀和X射線衍射儀分析鑄態(tài)和固溶處理后試樣。在37°C的模擬體液中進(jìn)行浸泡和電化學(xué)測(cè)試,評(píng)價(jià)其抗腐蝕性。為保證腐蝕測(cè)試的結(jié)果,對(duì)p H值進(jìn)行測(cè)試。結(jié)果發(fā)現(xiàn),大于24 h的固溶處理,金屬間化合物相溶解于基體中,并產(chǎn)生了近單晶相組織。金屬間化合物相的減少導(dǎo)致陰極區(qū)/陽極區(qū)比減小且腐蝕率降低。電化學(xué)和失重測(cè)試結(jié)果表明,延長(zhǎng)固溶處理時(shí)間可提高合金的抗腐蝕性。經(jīng)350°C固溶處理24 h后,鑄態(tài)合金的抗腐蝕性提高了60%以上。另外,逐漸減少的金屬間化合物相和伴隨的低p H值上升,降低了腐蝕速率。對(duì)于Mg-Zn合金作為生物可降解移植材料的應(yīng)用,固溶處理是一種可以提高腐蝕性的工藝。
[Abstract]:The biodegradable binary Mg-6Zn alloy was treated with solid solution to evaluate the effect of the microstructure change on the degradation rate of the alloy and its related mechanism. The solution treatment was carried out at 350 擄C for 648 h. The as-cast and solution treated samples were analyzed by optical microscope, scanning electron microscope, energy dispersive X-ray spectrometer and X-ray diffractometer. The corrosion resistance was evaluated by immersion and electrochemical test in 37 擄C simulated body fluid. In order to ensure the result of corrosion test, the pH value was tested. The results show that the intermetallic compound phase dissolves in the matrix after solution treatment for more than 24 h, and the near single crystal phase is formed. The decrease of intermetallic compound phase leads to the decrease of cathode / anode area ratio and the decrease of corrosion rate. The results of electrochemical and weightlessness test show that the corrosion resistance of the alloy can be improved by prolonging the time of solution treatment. After solution treatment at 350 擄C for 24 h, the corrosion resistance of the as-cast alloy was increased by more than 60%. In addition, the decreasing intermetallic compound phase and the accompanying low pH value decreased the corrosion rate. For the application of Mg-Zn alloy as biodegradable transplantation material, solid solution treatment is a process that can improve corrosion.
【作者單位】： Department
【基金】：the Ministry of Higher Education of Malaysia for the financial support (Vote No. Q.J130000.2524.04H18) Faculty of Mechanical Engineering of Universiti Teknologi Malaysia (UTM) for providing research facilities
【分類號(hào)】：TG166.4

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