本文關鍵詞： Fe Si Cu 鋁合金犧牲陽極 電化學性能　出處：《大連海事大學》2017年博士論文　論文類型：學位論文

【摘要】：鋁合金犧牲陽極廣泛應用于各類船舶、采油平臺等海洋基礎設施的腐蝕防護。目前國內外在犧牲陽極研究工作中主要采用改變合金元素含量或冶煉工藝的方法,然而關于雜質元素含量對鋁合金陽極電化學性能影響的研究工作鮮見報導。因此,研究Fe、Si和Cu對鋁合金陽極在海水中電化學性能的影響規(guī)律具有現(xiàn)實意義。本文采用電化學、微觀掃描電化學測試方法和掃描電鏡、電子探針、電感耦合等離子體質譜等現(xiàn)代物理測試技術,考查了不同F(xiàn)e、Si、Cu和In含量對Al-Zn-In-Mg-Ti合金陽極在海水中電化學性能的影響規(guī)律,得出以下結論。Al-5Zn-0.02In-1Mg-0.05Ti(wt.%)合金中添加 0.10 wt.%Fe 時,可使犧牲陽極在海水中的工作電位處于-1.052～-1.067 V之間,實際電容量為2665.97 A.h.kg-1,電流效率達到92.89%。陽極的開路電位足夠負,電化學極化性能較好,呈現(xiàn)低鈍化膜電阻和高雙電層電容的特性。而當Fe含量超過0.10 wt.%后,陽極活性溶解阻力增大,電流效率降低。Al-5Zn-0.02In-1Mg-0.05Ti(wt.%)合金中添加 0.09 wt.%Si 時,可使犧牲陽極在海水中的工作電位處于-0.918～-0.935 V之間,實際電容量為2450.94 A.h·kg-1,電流效率為85.42%。陽極的平均晶粒尺寸為47 μm,等軸晶增多,組織均勻性得到改善,在陰極保護過程中溶解均勻。當Si含量超過0.09wt.%后,鋁合金鈍化膜電阻增大,電流效率降低。Al-5Zn-0.02In-1Mg-0.05Ti(wt.%)合金中添加 0.005 wt.%Cu 時,可使犧牲陽極在海水中的工作電位處于-1.057～-1.078 V之間,實際電容量為2674.73 A.h·kg-1,電流效率高達93.22%,具備較好的溶解表觀形貌。當Cu含量超過0.005 wt.%后,大幅增加腐蝕產物粘度,使合金鈍化膜的電阻升高,活性溶解阻力增大,電流效率降低。Al-5Zn-0.02In(wt.%)三元合金中添加 0.10 wt.%Fe、0.09 wt.%Si 和 0.005 wt.%Cu時,可使鋁合金犧牲陽極在海水中的工作電位處于-1.086～-1.102V,實際電容量為2595.34 A.h·kg-1,電流效率達到90.43%,陽極表面溶解均勻,能夠提供穩(wěn)定的驅動電位和溶解電流。同時添加Fe、Si和Cu,可產生元素間的協(xié)同作用,并驗證了此含量配比對Al-Zn-In犧牲陽極電化學性能的影響規(guī)律存在普遍性。Al-5Zn-In-0.09Si-0.1Fe-0.005Cu(wt.%)合金中添加 0.02 wt.%In 時,可使鋁合金犧牲陽極在海水中的工作電位大小適中,促使被保護金屬發(fā)生陰極極化,避免陰極區(qū)的析氫自腐蝕。當In含量低于0.02 wt.%時,陽極不能被充分活化易出現(xiàn)局部腐蝕。當In含量高于0.02 wt.%后,陽極易形成較多的偏析相誘發(fā)大量晶間腐蝕,引起晶粒剝離,降低鋁合金陽極電流效率。
[Abstract]:Aluminum alloy sacrificial anode is widely used in the corrosion protection of marine infrastructure such as ships and oil recovery platforms. At present, the methods of changing the content of alloy elements or smelting process are mainly used in the research of sacrificial anodes at home and abroad. However, there are few reports on the effect of impurity element content on the electrochemical properties of aluminum alloy anodes. Therefore, it is of practical significance to study the effect of Fe Si and Cu on the electrochemical properties of aluminum alloy anodes in seawater. In this paper, the effects of different contents of Fe, Si, Cu and in on the electrochemical properties of Al-Zn-In-Mg-Ti alloy anode in seawater have been investigated by means of scanning electron microscopy, electron probe, inductively coupled plasma mass spectrometry and other modern physical testing techniques, such as microscanning electrochemical measurement method, electron microprobe, electron probe, inductively coupled plasma mass spectrometry and so on. The following conclusions can be drawn: when 0.10 wtt. is added to Al-5Zn-0.02In-1Mg-0.05Tiwt.) alloy, the working potential of sacrificial anode in seawater is between -1.052 and 1.067 V, the actual capacity is 2665.97 A.h.kg-1, the current efficiency is 92.899.The open circuit potential of anode is negative enough, and the electrochemical polarization is good. When Fe content is more than 0.10 wt.%, the active dissolution resistance of anode increases, and the current efficiency decreases. Al-5Zn-0.02In-1Mg-0.05TiWT.) alloy is added 0.09 wt.%Si to the alloy, which is characterized by low passivation film resistance and high double layer capacitance, and when Fe content exceeds 0.10 wt.%, the anodic active dissolution resistance increases and the current efficiency decreases. The working potential of sacrificial anode in seawater is -0.918 ~ 0.935 V, the actual capacity is 2450.94 A.h 路kg ~ (-1), the current efficiency is 85.42, the average grain size of anode is 47 渭 m, the equiaxed crystal increases, and the structure uniformity is improved. When Si content exceeds 0.09wt.%, the passivation film resistance increases and the current efficiency decreases. When 0.005 wt.%Cu is added to the alloy, the working potential of the sacrificial anode in seawater is -1.057- 1.078V. The actual capacity is 2674.73 A.h 路kg-1, the current efficiency is 93.2222, and the dissolution surface morphology is better. When Cu content exceeds 0.005 wt.%, the viscosity of corrosion products is increased significantly, the resistance of passivation film increases and the active dissolution resistance increases. When 0.10 wt.0.09 wt.%Si and 0.005 wt.%Cu were added to the alloy, the working potential of the sacrificial anode in seawater was -1.086 -1.102 V, the actual capacity was 2595.34 A.h 路kg-1, the current efficiency reached 90.433.The anode surface was dissolved uniformly. It can provide stable driving potential and dissolving current. The synergistic effect between elements can be obtained by adding Fesi Si and Cu. It is verified that the effect of this ratio on the electrochemical properties of Al-Zn-In sacrificial anode is universal when 0.02 wt.%In is added to the alloy, Al-5Zn-In-0.09Si-0.1Fe-0.005Cuwt.twt. The working potential of the aluminum alloy sacrificial anode in seawater is moderate, and the cathodic polarization of the protected metal is promoted to avoid self-corrosion of hydrogen evolution in the cathodic region. When in content is lower than 0.02 wt.%, When the content of in is higher than 0.02 wt.%, the anode is prone to form more segregation phase to induce a large number of intergranular corrosion, which leads to grain stripping and reduces the anodic current efficiency of aluminum alloy.
【學位授予單位】：大連海事大學
【學位級別】：博士
【學位授予年份】：2017
【分類號】：U672.72;U668

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本文編號：1549330