稀土元素Sm對AM60鎂合金顯微組織和耐腐蝕性能的影響
發(fā)布時間:2018-07-15 22:26
【摘要】:采用靜態(tài)失重法、掃描電子鏡及能譜分析、電化學(xué)測試法等方法研究了稀土元素Sm(0~0.9%)對AM60鎂合金的鑄態(tài)組織和耐腐蝕性的影響。結(jié)果表明:微量稀土元素Sm可細(xì)化AM60鎂合金中β-Mg17Al12相,合金中的β-Mg17Al12相由粗大、連續(xù)樹枝狀分布逐漸轉(zhuǎn)變?yōu)榧?xì)小、彌散的顆粒狀均勻分布。同時,合金中生成了大量彌散分布的富Sm的稀土相。這些富Sm的稀土相使合金的耐腐蝕性得到顯著提高,當(dāng)稀土Sm含量為0.6%時,合金腐蝕速率為0.6mg·cm-2·d-1,僅為基體合金的37%。隨AM60鎂合金中稀土元素Sm含量的增加,合金腐蝕電位逐漸升高,腐蝕電流減小。
[Abstract]:The effects of rare earth element Sm (0. 9%) on the as-cast microstructure and corrosion resistance of AM60 magnesium alloy were studied by static weightlessness, scanning electron microscopy and energy dispersive spectroscopy. The results show that the trace rare earth element Sm can refine 尾 -Mg17Al12 phase in AM60 magnesium alloy, and the 尾 -Mg17Al12 phase in AM60 magnesium alloy changes from coarse, continuous dendritic distribution to fine and dispersed granular uniform distribution. At the same time, a large number of Sm rich rare earth phases were formed in the alloy. The corrosion resistance of these rare earth phases rich in Sm is obviously improved. When the content of Sm is 0.6, the corrosion rate of the alloy is 0.6mg cm-2 d-1, which is only 37% of the matrix alloy. With the increase of the content of Sm in AM60 magnesium alloy, the corrosion potential of the alloy increases and the corrosion current decreases.
【作者單位】: 新余學(xué)院新能源科學(xué)與工程學(xué)院;
【分類號】:TG146.22
[Abstract]:The effects of rare earth element Sm (0. 9%) on the as-cast microstructure and corrosion resistance of AM60 magnesium alloy were studied by static weightlessness, scanning electron microscopy and energy dispersive spectroscopy. The results show that the trace rare earth element Sm can refine 尾 -Mg17Al12 phase in AM60 magnesium alloy, and the 尾 -Mg17Al12 phase in AM60 magnesium alloy changes from coarse, continuous dendritic distribution to fine and dispersed granular uniform distribution. At the same time, a large number of Sm rich rare earth phases were formed in the alloy. The corrosion resistance of these rare earth phases rich in Sm is obviously improved. When the content of Sm is 0.6, the corrosion rate of the alloy is 0.6mg cm-2 d-1, which is only 37% of the matrix alloy. With the increase of the content of Sm in AM60 magnesium alloy, the corrosion potential of the alloy increases and the corrosion current decreases.
【作者單位】: 新余學(xué)院新能源科學(xué)與工程學(xué)院;
【分類號】:TG146.22
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