發(fā)布時(shí)間：2018-05-02 07:38

  本文選題：鎂合金 + 硅烷偶聯(lián)劑��； 參考：《吉林大學(xué)》2017年碩士論文

【摘要】：鎂合金具有良好的力學(xué)性能,鎂合金已經(jīng)廣泛的應(yīng)用于汽車(chē),電子等領(lǐng)域。同時(shí)其還生物相容性和可降解性,機(jī)械性能與人體骨骼相近,可以有效地避免“應(yīng)力屏蔽”效應(yīng),二次手術(shù),是一種很有潛力的生物醫(yī)用材料。但是由于鎂合金的性質(zhì)極其活潑,極容易發(fā)生腐蝕,無(wú)法滿足作為植物材料服役期限的要求,因此需要研究如何控制其降解速率并且進(jìn)一步提升其生物相容性。本實(shí)驗(yàn)利用AZ60鎂合金作為基體,利用KH550型硅烷偶聯(lián)劑對(duì)鎂合金進(jìn)行硅烷處理,同時(shí)利用處理的硅烷涂層誘導(dǎo)生長(zhǎng)制備復(fù)合涂層。首先,利用硅烷偶聯(lián)劑水解,對(duì)鎂合金進(jìn)行硅烷處理在表面形成一層硅烷涂層,實(shí)驗(yàn)主要通過(guò)研究KH550含量、醇水比、p H、水解時(shí)間和涂覆層數(shù)進(jìn)行探究并找出最佳工藝參數(shù)。并對(duì)最佳工藝條件下,通過(guò)FTIR、SEM、電化學(xué)工作站及浸泡實(shí)驗(yàn)對(duì)涂層成分和性能進(jìn)行表征。然后,利用仿生誘導(dǎo)的方式在硅烷涂層表面誘導(dǎo)生長(zhǎng)DCDP涂層和碳酸鈣涂層。然后利用XRD、FTIR、SEM,電化學(xué)工作站和浸泡實(shí)驗(yàn)對(duì)涂層的成分和性能進(jìn)行表征和分析。實(shí)驗(yàn)結(jié)果表明,利用KH550型硅烷偶聯(lián)劑對(duì)AZ60鎂合金進(jìn)行硅烷處理,可以有效的提高AZ60鎂合金基體的耐腐蝕性能。最佳工藝參數(shù)為KH550的含量為6%,醇水比為1:9、溶液p H為11,水解6小時(shí)后,涂覆2層。在這個(gè)條件下,涂層表面較為均勻平整,涂層的腐蝕電位提高了0.337V,腐蝕電流密度下降為基體的1/14。浸泡實(shí)驗(yàn)表明硅烷涂層可以降低基體的析氫速率,穩(wěn)定周?chē)h(huán)境的p H,有效的降低了基體的腐蝕速率,并且硅烷涂層也具備一定的生物礦化能力。通過(guò)硅烷偶聯(lián)劑誘導(dǎo)生長(zhǎng)出的碳酸鈣涂層可以提高基體的耐蝕性,而DCDP涂層可以進(jìn)一步提高基體的耐蝕性。碳酸鈣的涂層表面形貌為均勻致密的塊狀,涂層的腐蝕電位為-1.3584V,腐蝕電流密度為13.202μA,浸泡實(shí)驗(yàn)后的膜層會(huì)出現(xiàn)一定程度的脫落和開(kāi)裂;而DCDP涂層則是在表面呈現(xiàn)出纖維狀,有利于細(xì)胞在表面的附著,同時(shí)具備良好的電化學(xué)性能,腐蝕電位為-1.0673V,腐蝕電流密度為0.4729μA,耐蝕性能有顯著的提升。同時(shí),浸泡后的涂層上會(huì)形成絮狀的腐蝕產(chǎn)物,主要成分為Ca、P,說(shuō)明涂層具備良好的生物相容性和生物礦化能力。
[Abstract]:Magnesium alloys have good mechanical properties, magnesium alloys have been widely used in automotive, electronic and other fields. At the same time, it has biocompatibility and biodegradability, and its mechanical property is similar to that of human skeleton, which can effectively avoid the "stress shielding" effect. Secondary surgery is a potential biomedical material. However, magnesium alloys are very active and easy to corrode, which can not meet the requirements of the service life of plant materials. Therefore, it is necessary to study how to control the degradation rate of magnesium alloys and further improve their biocompatibility. In this experiment, AZ60 magnesium alloy was used as substrate, KH550 silane coupling agent was used for silane treatment of magnesium alloy, and composite coating was prepared by induced growth of treated silane coating. Firstly, silane coating was formed on magnesium alloy surface by silane treatment with silane coupling agent. The content of KH550, the ratio of alcohol to water, hydrolysis time and coating number were studied and the optimum process parameters were found out. The composition and properties of the coating were characterized by FTIR SEM, electrochemical workstation and immersion test. Then, DCDP coating and calcium carbonate coating were induced on the surface of silane coating by bionic induction. Then the composition and properties of the coating were characterized and analyzed by XRDX FTIR SEM, electrochemical workstation and immersion test. The results show that KH550 silane coupling agent can effectively improve the corrosion resistance of AZ60 magnesium alloy matrix by silane treatment. The optimum technological parameters were as follows: the content of KH550 was 6%, the ratio of alcohol to water was 1: 9, solution pH was 11. After 6 hours of hydrolysis, two layers were coated. Under this condition, the surface of the coating is even and flat, the corrosion potential of the coating increases by 0.337V, and the corrosion current density decreases to 1 / 14 of the substrate. Soaking experiments show that silane coating can reduce the hydrogen evolution rate of the substrate, stabilize the ambient pH, effectively reduce the corrosion rate of the substrate, and the silane coating also has certain biomineralization ability. Caco _ 3 coating induced by silane coupling agent can improve the corrosion resistance of the substrate, while the DCDP coating can further improve the corrosion resistance of the substrate. The surface morphology of calcium carbonate coating is uniform and dense, the corrosion potential of the coating is -1.3584 V, the corrosion current density is 13.202 渭 A. the film layer after soaking will be shedding and cracking to a certain extent, while the DCDP coating is fibrous on the surface, and the corrosion current density of the coating is 13.202 渭 A, and the corrosion potential of the coating is -1.3584 V, and the corrosion current density is 13.202 渭 A. The corrosion potential is -1.0673V and the corrosion current density is 0.4729 渭 A. At the same time, a flocculent corrosion product was formed on the coating after soaking, which showed that the coating had good biocompatibility and biomineralization ability.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TG174.4

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本文編號(hào)：1832952