Cryogenic machining induced corrosion resistance of magnesium alloy AZ91

Vikas Marakini , Charudat P , Srinivasa Pai P , Bhaskara P. Achar , Bibekananda Sahoo , Udaya Bhat
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Abstract

Magnesium (Mg) alloys are popular in the aerospace and automotive sector owing to their light-weight aspects. Amongst various Mg alloys, AZ91 alloy has been trending and needs to be completely explored. The corrosion resistance of AZ91 alloy has always been a question, hence needs further investigation. The impact of face milling operations under cryogenic conditions on the corrosion properties of AZ91 alloy is studied in the current work. Using electrochemical polarization testing technique with a 3.5 % NaCl solution, the optimal surface finish of the alloy produced by cryogenic assisted face milling has been contrasted with dry milling. The polarization method compares both specimens after testing them for 0.5 h. Cryogenic machining considerably minimized the roughness by upto 28 % with values ranging between 0.0525 µm and 0.1169 µm when compared to the 0.1259 µm and 0.0691 µm from dry condition. The comparatively low roughness surface from cryogenic condition demonstrated a relatively low corrosion rate (1.1992 mm/year in cryogenic; 1.2891 mm/year in dry), indicating that the corrosion rates are directly related to the surface roughness. The superior corrosion resistance of the cryogenic milled surface over the dry milled surface was supported by the polarization curves. Additionally, the elemental analysis test on the surfaces after the polarization test revealed that the cryogenic milled surface had less oxygen (44.28 wt% and 7.29 wt%) than the dry milled surface (47.13 wt% and 10.01 wt%), proving the superior corrosion resistance of cryogenic milled surface.
低温加工诱导AZ91镁合金的耐腐蚀性能
镁合金因其重量轻而在航空航天和汽车领域广受欢迎。在各种镁合金中,AZ91合金已成为发展趋势,有待进一步探索。AZ91合金的耐腐蚀性能一直是一个有待进一步研究的问题。本文研究了低温条件下铣削加工对AZ91合金腐蚀性能的影响。采用电化学极化测试技术,在3.5 % NaCl溶液中,对比了低温辅助铣削加工的合金表面光洁度与干铣削的最佳表面光洁度。极化法在0.5 h测试后对两种试样进行比较。与干燥条件下的0.1259 µm和0.0691 µm相比,低温加工将粗糙度显著降低了28% %,其值范围在0.0525 µm和0.1169 µm之间。低温条件下表面粗糙度相对较低,腐蚀速率相对较低(1.1992 mm/年;1.2891 mm/年(干燥时),说明腐蚀速率与表面粗糙度直接相关。极化曲线表明,低温铣削表面的耐蚀性优于干铣削表面。此外,对极化试验后的表面进行元素分析测试表明,低温铣削表面的氧含量(44.28 wt%和7.29 wt%)低于干铣削表面(47.13 wt%和10.01 wt%),证明了低温铣削表面具有更强的耐腐蚀性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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