腐蝕行為
江 峰1, 張海峰2, 胡壯麒2
(1.中國科學(xué)院 金屬研究所,
金屬腐蝕與防護(hù)國家重點(diǎn)實(shí)驗室, 沈陽 110016;
2. 中國科學(xué)院 金屬研究所,
沈陽材料科學(xué)國家(聯(lián)合)實(shí)驗室, 沈陽 110016)
摘 要: 利用電化學(xué)極化曲線方法、交流阻抗(EIS)技術(shù)和掃描電子顯微鏡(SEM)研究了Mg65Y10Cu25非晶及相應(yīng)的晶化合金在3.5%NaCl溶液中的腐蝕行為。極化曲線測試結(jié)果表明，非晶合金Mg65Y10Cu25在NaCl溶液中為活性溶解，腐蝕反應(yīng)由陰極反應(yīng)和陽極反應(yīng)共同控制。EIS測試表明，隨著浸泡時間延長，非晶合金耐蝕性下降，EIS由３個時間常數(shù)變?yōu)椋矀€時間常數(shù)。SEM測試表明，非晶合金經(jīng)過24h浸泡后，表面發(fā)生了極為不均勻的腐蝕；EDAX能譜表明，非晶合金經(jīng)過浸泡后，表面成分發(fā)生了較大變化，含鎂量減少，表面出現(xiàn)了濃度分布不均勻的氧元素。晶化后Mg65Y10Cu25合金的耐蝕性略有提高。探討了非晶合金在3.5%NaCl溶液中的腐蝕機(jī)理。
關(guān)鍵字: Mg65Y10Cu25非晶合金; 電化學(xué); 交流阻抗; 腐蝕行為
Mg65Y10Cu25 amorphous alloy in
3.5% NaCl solution
JIANG Feng1, ZHANG Hai-feng2, HU Zhuang-qi2
（1 State Key Laboratory for Corrosion and Protection,
Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, China;
2 Shenyang National Laboratory for Materials Science,
Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, China）
Abstract:Corrosion behaviors of amorphous alloy Mg65Y10Cu25 and its corresponding crystalline multiphase alloy in 3.5%NaCl solution were studied by electrochemical methods and scanning electronic microscopy technology (SEM) Potentiodynamic experiments show that active dissolution takes place in Mg65Y10Cu25 amorphous alloy in NaCl solution, and the corrosion is controlled by both anodic and cathodic reactions The corrosion resistance decreases with the elongation of immersion time EIS experiments show that the time constants decrease from three to two when the amorphous alloy is immersed more than 6h SEM experiment shows that very non-even corrosion takes place in the amorphous alloy when immersed for 24h in NaCl solution The content of elements of the alloy surface changes greatly The content of Mg decreases, while a new element of oxygen is found on the surface and its content varies greatly in different areas The corrosion resistance of crystalline multiphase alloy is slightly increased The corrosion mechanism of this alloy in 3.5%NaCl solution is also discussed
Key words: Mg65Y10Cu25 amorphous alloy; electrochemistry; EIS; corrosion behavior
