發(fā)布時(shí)間：2018-12-14 14:43

【摘要】：針對(duì)鈦合金Ti6Al4V在不同溶液(NaCl、NaBr、KBr)和不同溶液質(zhì)量分?jǐn)?shù)(6.5%、12.5%、18.5%)下的電化學(xué)腐蝕行為進(jìn)行研究,得到了鈦合金腐蝕極化曲線和腐蝕動(dòng)力學(xué)參數(shù);根據(jù)掃描電鏡腐蝕圖像研究了鈦合金的電化學(xué)腐蝕機(jī)理;采用像素點(diǎn)覆蓋分形維數(shù)法對(duì)腐蝕坑的分形特征進(jìn)行了計(jì)算,得到了腐蝕表面形貌與分形的關(guān)系.研究結(jié)果表明:相比在NaBr溶液和KBr溶液中,鈦合金在NaCl溶液中的活化范圍更寬,氧化溶解時(shí)間更長(zhǎng),差異效應(yīng)明顯;相同質(zhì)量分?jǐn)?shù)下鈦合金在NaBr溶液中的腐蝕性更強(qiáng);隨著質(zhì)量分?jǐn)?shù)增大,鈦合金在3種溶液中的分形維數(shù)逐步變化——在NaBr溶液中的分形維數(shù)最大,表面形貌更為復(fù)雜,在NaCl溶液中的分形維數(shù)最小,表面形貌比較平整.
[Abstract]:The electrochemical corrosion behavior of titanium alloy Ti6Al4V in different solution (NaCl,NaBr,KBr) and different solution mass fraction (6.5% and 12.5%) was studied. The corrosion polarization curve and corrosion kinetics parameters of titanium alloy were obtained. The electrochemical corrosion mechanism of titanium alloy was studied by scanning electron microscope (SEM), and the fractal characteristics of the corrosion pit were calculated by the method of pixel coverage fractal dimension, and the relationship between the morphology of the corrosion surface and the fractal was obtained. The results show that the activation range of titanium alloy in NaCl solution is wider than that in NaBr solution and KBr solution, and the oxidation dissolution time is longer, the difference effect is obvious, and the corrosion of titanium alloy in NaBr solution is stronger at the same mass fraction. With the increase of mass fraction, the fractal dimension of titanium alloy changes gradually in three kinds of solutions: the fractal dimension in NaBr solution is the largest, the surface morphology is more complex, and the fractal dimension in NaCl solution is the smallest, and the surface morphology is relatively flat.
【作者單位】： 南京航空航天大學(xué)江蘇省精密與微細(xì)制造技術(shù)重點(diǎn)實(shí)驗(yàn)室;江蘇省數(shù)字化電化學(xué)加工重點(diǎn)實(shí)驗(yàn)室;常州工學(xué)院機(jī)械與車輛工程學(xué)院;
【基金】：江蘇省自然科學(xué)基金面上項(xiàng)目(BK20161193) 江蘇省自然科學(xué)研究重大項(xiàng)目(15KJA460002) 江蘇省精密與微細(xì)制造技術(shù)重點(diǎn)實(shí)驗(yàn)室開放基金資助項(xiàng)目~~
【分類號(hào)】：TG174.36

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