Dyakova Vanya, Kostova Yoanna, Tzaneva Boriana, Spasova Hristina, Kovacheva Daniela
Institute of Metal Science, Equipment and Technologies with Hydro- and Aerodynamics Centre "Acad. A. Balevski", Bulgarian Academy of Sciences, Shipchenski Prohod Str., 67, 1574 Sofia, Bulgaria.
Department of Chemistry, Technical University of Sofia, Kliment Ohridski Blvd., 8, 1000 Sofia, Bulgaria.
Materials (Basel). 2023 Aug 3;16(15):5446. doi: 10.3390/ma16155446.
The effect of copper as a minority alloying element on the corrosion behaviour of amorphous and crystalline AlNiSi and AlNiSiCu alloys was investigated in this study. Amorphous alloys were produced as rapidly solidified ribbons using the Chill Block Melt Spinning (CBMS) method and subsequently annealed to complete crystallisation. The corrosion rate of alloys was obtained through continuous immersion tests in 3.5% NaCl at 25 °C and 50 °C for 360 h. The electrochemical parameters corrosion current density () and corrosion potential () were determined via the potentiodynamic polarisation test. The results showed better corrosion characteristics of amorphous alloys. The addition of 2 at.% copper to the AlNiSi alloy improved pitting corrosion resistance without significant effect on the corrosion current and potential. In immersion tests at 25 °C, the presence of copper resulted in an increase in the corrosion rate of about 300% for both amorphous and crystalline alloys. At a temperature of 50 °C, this increase is on average 130%. The apparent difference between the results of the two test methods is discussed in terms of the imperfections on the surface of rapidly solidified ribbons. The results of this study will contribute to a more complex understanding of the nature of amorphous alloys and their application.
本研究考察了铜作为微量合金元素对非晶态及晶态AlNiSi和AlNiSiCu合金腐蚀行为的影响。采用激冷块熔体纺丝（CBMS）法制备非晶合金薄带，并对其进行退火处理以实现完全结晶。通过在25℃和50℃的3.5%氯化钠溶液中连续浸泡360小时来测定合金的腐蚀速率。通过动电位极化试验确定电化学参数腐蚀电流密度（）和腐蚀电位（）。结果表明非晶合金具有更好的腐蚀特性。向AlNiSi合金中添加2原子%的铜可提高耐点蚀性能，而对腐蚀电流和电位无显著影响。在25℃的浸泡试验中，铜的存在使非晶态和晶态合金的腐蚀速率均增加约300%。在50℃时，这种增加平均为130%。从快速凝固薄带表面的缺陷角度讨论了两种测试方法结果的明显差异。本研究结果将有助于更深入地理解非晶合金的本质及其应用。
