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- 저자 : Dhananjay Dubey (검색결과 1 건)
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Effect of Precipitate Characteristics on the Corrosion Behavior of a AZ80 Magnesium Alloy
Dhananjay Dubey,Kondababu Kadali,Harikrishna Kancharla,Anuz Zindal,Jayant Jain,K. Mondal,Sudhanshu S. Singh 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.9
In this study, a systematic investigation on the effect of both aging temperature (250 °C and 330 °C) and time (chosen basedon aging curves) on the distribution and volume fraction of the Mg17Al12precipitates and subsequently on the corrosionbehavior of the AZ80 magnesium alloy was carried out by conducting both immersion and dynamic polarization test in afreely aerated 3.5% NaCl solution. The analysis of corrosion products using Raman spectroscopy and X-ray diffraction andinvestigation of corrosion morphologies using scanning electron microscopy suggested galvanic corrosion of the anodicα-Mg matrix in contact with the cathodic Mg17Al12precipitates. The higher corrosion resistance of the alloy aged at lowertemperature (250 °C) was attributed to the higher number density of the Mg17Al12precipitates than that at higher temperature(330 °C). In the peak aged condition, the average number densities of precipitates (1/μm2) were measured to be ~ 0.74and ~ 0.32 and average corrosion rates (mm/y) were measured to be ~ 3.0 and ~ 5.0 at the aging temperatures of 250 °Cand 330 °C, respectively. At a particular aging temperature, the corrosion resistance increased to a maximum at peak-agedcondition followed by a decline in the over-aged condition and further increase with prolong aging, which was correlatedwith the number density, size and distribution of the Mg17Al12precipitates.
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