本文選題：AZ91D鎂合金　切入點：微弧氧化　出處：《長安大學(xué)》2015年碩士論文

【摘要】：傳統(tǒng)微弧氧化電解液體系在鎂合金表面制備的微弧氧化膜表面均勻分布大量“火山錐”狀微孔。這些微孔是膜層的薄弱區(qū),腐蝕介質(zhì)可穿過微孔對合金基體產(chǎn)生腐蝕。為了提高膜層耐蝕性,本文利用自封閉型鋯鹽體系電解液在AZ91D鎂合金表面制備出自封閉型陶瓷膜,封閉物質(zhì)和膜層成分均勻一致,實現(xiàn)了膜層生長和微孔封閉一次性完成,從而提高膜層的耐蝕性。本文通過掃描電子顯微鏡(SEM)、X-射線衍射分析(XRD)探索氟化物、鋯鹽一和鋯鹽二濃度對微弧氧化膜層的影響。結(jié)果表明:自封閉型陶瓷膜主要相組成為MgF2、ZrO2以及Mg2Zr5O12;氟化物有利于降低起弧電壓,促進(jìn)膜層生長;鋯鹽一添加量為10g/L時孔隙率達(dá)到最小值2.1%;鋯鹽二可以增加單位面積弧點密度,降低處理時間,顯著降低膜層孔隙率,且隨著其濃度增加,膜層孔隙率降低至最小值2%左右后趨于穩(wěn)定。實驗得出氟化物、鋯鹽一和鋯鹽二的最佳濃度分別為15g/L,10g/L,30mL/L。采用控制處理電壓和處理時間,建立了處理電壓與孔隙率和膜厚、處理時間與孔隙率和膜厚的關(guān)系。結(jié)合各時期微孔封閉形態(tài)SEM照片和EDS元素圖譜探討微孔封閉過程,推斷微孔封閉分為三個階段:微孔形成及膠體、離子吸附階段、顆粒狀燒結(jié)物填充階段、縫隙燒結(jié)“焊合”階段。對不同工藝制備微弧氧化膜層在3.5%氯化鈉溶液中腐蝕行為的研究,發(fā)現(xiàn)膜層的耐蝕性與孔隙率、膜厚關(guān)系密切。采用自然時效耐候試驗,點滴腐蝕測試,CuCl2溶液全浸泡加速腐蝕測試和電化學(xué)測試分析,對AZ91D鎂合金原始樣和自封孔型電解液、未封孔型電解液處理的試樣的耐蝕性進(jìn)行測試,結(jié)果表明:封閉型微弧氧化膜層耐蝕性明顯優(yōu)于未封閉型膜層,微孔封閉對提高膜層耐蝕性效果顯著。
[Abstract]:A large number of "volcanic cone" micropores are uniformly distributed on the surface of magnesium alloy surface prepared by traditional microarc oxidation electrolyte system. In order to improve the corrosion resistance of the film, the self-sealing zirconium salt electrolyte was used to prepare the self-sealing ceramic film on the surface of AZ91D magnesium alloy. In order to improve the corrosion resistance of the film, the growth of the film and the sealing of the micropore can be completed in one time. In this paper, the fluorides were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis. The effect of zirconium salt and zirconium salt concentration on the micro-arc oxide film is studied. The results show that the self-sealing ceramic films are mainly composed of MgF2ZrO2 and Mg2Zr5O12.The fluoride can reduce the arc starting voltage and promote the film growth. Zirconium salt can increase the density of arc point per unit area, decrease the treatment time, decrease the porosity of film layer, and increase the concentration of zirconium salt with the increase of the concentration of zirconium salt, and the porosity of film layer can reach the minimum value of 2.1 when the addition amount of zirconium salt is 10g/L. The optimum concentration of fluoride, zirconium salt 1 and zirconium salt 2 is 15 g / L ~ 10 g / L ~ (10) g / L ~ (-1) / L ~ (30) mL 路L ~ (-1) 路L ~ (-1), respectively. The treatment voltage, porosity and film thickness are established by controlling the treatment voltage and treatment time. The relationship between the processing time and the porosity and membrane thickness. The micropore sealing process was discussed by SEM photographs and EDS elemental atlas. The micropore sealing was divided into three stages: micropore formation and colloid, ion adsorption. The corrosion behavior of micro-arc oxide film prepared by different processes in 3.5% sodium chloride solution was studied. The corrosion resistance and porosity of the film were found. The film thickness is closely related. By using natural aging weathering test, droplet corrosion test, full immersion accelerated corrosion test and electrochemical test analysis of AZ91D magnesium alloy, the original sample and self-sealing pore electrolyte of AZ91D magnesium alloy are studied. The corrosion resistance of the samples treated with unsealed electrolyte is tested. The results show that the corrosion resistance of the closed micro-arc oxide film is obviously better than that of the unsealed film, and the effect of micropore sealing on improving the corrosion resistance of the film is remarkable.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG174.4

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