本文關鍵詞：粉體復合鎂合金微弧氧化膜層的制備和性能的研究　出處：《沈陽理工大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 鎂合金 微弧氧化 粉體 耐蝕性

【摘要】：鎂合金以其優(yōu)良的性能被廣泛的應用。然而鎂較負的電位使其需進行表面處理提高抗腐蝕能力。鎂合金經微弧氧化處理后能顯著提高基體的耐蝕性和強度。本文通過向電解液中加入功能粉體,利用微弧氧化技術,在基體合金表面形成粉體復合微弧氧化膜。研究添加的不同功能粉體對微弧氧化膜性能的影響,并采用SEM、XRD、電化學測試、點滴試驗等檢測手段進行膜層性能的檢測。電解液中加入溶膠-凝膠法制得的鐵氧體粉體,利用微弧氧化技術,在基體合金表面制出粉體復合膜。研究了電解液配方、粉體添加量、外加磁場等對復合膜層的影響,優(yōu)化出了最佳的基礎電解液配方及粉體的添加量。結果表明,加入納米鐵氧體粉體后膜層表面的孔洞和裂紋減少,膜層相成分增加了鐵氧體相,膜層中Fe、Ba、Zn三種元素含量顯著提高,復合膜層的腐蝕電位由微弧氧化膜的-1.089V增加到-0.869V,腐蝕電流由2.26×10-6A減小到2.95×10-7A,耐蝕性明顯提高。外加磁鐵條件可以促進復合膜層中鐵氧體的含量,提高膜層的耐蝕性能,膜層的腐蝕電位由-0.869V提高到-0.813V,腐蝕電流由2.95×10-7A下降到1.86×10-7A。電解液中加入液相還原法制備的納米鎳粉,在鎂合金表面制備出鎳粉復合微弧氧化膜層。研究了粉體的添加對復合膜層耐蝕性及微觀組織結構的影響,優(yōu)化出了最佳的粉體添加量,并分析了甘油的加入及封閉實驗對膜層性能的影響。結果表明,加入粉體后,復合膜層的表面光滑致密,孔洞量及尺寸減小,耐蝕性能明顯提高,復合膜腐蝕電位為-0.843V,腐蝕電流為4.682×10-7A。甘油的加入可以使微弧氧化反應變得穩(wěn)定,膜層放電孔徑變小,提高了膜層的致密性和抗腐蝕能力,腐蝕電位為-0.832V,腐蝕電流為1.436×10-7A。封閉實驗可以減少復合膜層的微孔數量,使膜層幾乎無微孔和裂紋,提高膜層的抗腐蝕能力。通過化學鍍的方法制備鎳包覆Si C粉體,將制得的粉體加入到電解液中制備粉體復合微弧氧化膜。實驗研究了鎳包覆Si C粉體的添加對復合膜層耐蝕性及微觀組織結構的影響,確定了實驗的粉體添加量,并分析了超聲波分散條件及封閉實驗對膜層的影響。結果表明,粉體復合后的微弧氧化膜層表面致密,孔洞減少,幾乎無裂紋,膜層的耐蝕性能有所提高,腐蝕電位為-0.913V,腐蝕電流為1.548×10-6A。超聲波條件促進膜層中鎳包覆Si C粉體的含量,增加膜層的耐蝕性能,腐蝕電位為-0.902V,腐蝕電流為4.164×10-7A。封閉實驗可以減少復合膜層的微孔數量,使膜層幾乎無微孔和裂紋,提高膜層的抗腐蝕能力。
[Abstract]:Magnesium alloy for its excellent performance has been widely used. However, the negative potential of magnesium is needed to improve corrosion resistance and surface treatment. Magnesium alloy after micro arc oxidation treatment can significantly improve the matrix corrosion resistance and strength. Through adding powder to the electrolyte, using micro arc oxidation technology, the formation of powder composite micro arc oxidation in the matrix alloy surface. The influence of different function of powder added on microarc oxidation performance, and the use of SEM, XRD, electrochemical detection, detection means for drop test of film performance. Adding ferrite powder prepared by sol gel electrolyte, using microarc oxidation technology in the matrix alloy surface prepared by powder composite membrane. The effects of electrolyte formula, adding amount of powder, the effects of magnetic field on the composite film, optimized the best formula and add basic electrolyte powder Volume. The results show that the addition of nano ferrite powder after surface pores and cracks reduced film phase composition increased the ferrite phase, the film of Fe, Ba, Zn significantly increased the content of three elements, the corrosion potential of composite coatings increased by microarc oxidation of -1.089V to -0.869V, the corrosion current by 2.26 * 10-6A reduced to 2.95 * 10-7A, improved corrosion resistance. External magnet conditions can promote the content of ferrite composite coatings, improving the corrosion resistance of the coatings, the corrosion potential of the film increased from -0.869V to -0.813V, the corrosion current by 2.95 * 10-7A 1.86 * 10-7A. down to add liquid electrolyte prepared by reduction of nano nickel powder and on the surface of magnesium alloy were prepared by microarc oxidation coating nickel powder composite was studied. The effect of adding powder to composite coating corrosion resistance and microstructure, optimized the adding amount of powder is the best, and analyzes the glycerol Join and closure of the influence on film performance. The results show that adding powder, composite film surface is smooth and compact, and the amount of pore size decreases and the corrosion resistance increased, the corrosion potential of -0.843V composite film, the corrosion current is 4.682 * 10-7A. the addition of glycerol can make the microarc oxidation reaction becomes stable, the discharge aperture change small, improves the coating compactness and corrosion resistance, the corrosion potential of -0.832V, the corrosion current is 1.436 * 10-7A. blocking experiment can reduce the number of microporous composite film, the film almost no pores and cracks, improve the corrosion resistance of the film. Was prepared by chemical plating nickel coated Si C powder. The prepared powder was added to the preparation of powder composite micro arc oxidation electrolyte system. Experimental study of the effect of adding nickel coated Si C powder to composite coating corrosion resistance and microstructure, determined by experiment The powder adding amount, and analyzed the ultrasonic dispersion conditions and closure of the influence on film. The results show that the powder of the composite ceramic coating surface is dense, almost no cracks, holes will reduce and the corrosion resistance of coatings increased, the corrosion potential of -0.913V, the corrosion current is 1.548 * 10-6A. ultrasonic condition to promote the content of nickel Si coated C powder coating, increase the corrosion resistance of coatings, the corrosion potential of -0.902V, the corrosion current is 4.164 * 10-7A. blocking experiment can reduce the number of microporous composite film, the film almost no pores and cracks, improve the corrosion resistance of the film.

【學位授予單位】：沈陽理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG174.4

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