I am working on study of oxidation behavior of two binary alloys Mg-0.8Nd, Mg-0.2Zr & ternary alloy Mg-0.8Nd-0.2Zr in 1M salt solution. The heat treatment yielded positive results for binary alloys but for ternary alloy the corrosion rate is abruptly increasing compared to as cast form. I believe this might be the case of insipient melting. Unfortunately I couldn't get a defined microstructure. I did normal grinding with SIC grit size from 64microns to 5 microns in decreasing steps then polished with 3 micron, 1 micron diamond suspension and finally oxide polishing then washed with ethanol using ultrasonicate. The observed microstructure is attached below for insights. I hope to get some inputs and would like to know where did I go wrong.
Thanks a lot !
Experimental conditions and the environment, heating process, temperature controls, and mixing are some of the primary factors to look out for. The ratios of ingredients can also lead to the situation. The extent and outreach of the corrosion you are getting ahs to be defined. It's better if full details on these aspects are put into. Anyway, more precise answers can be articulated based on the details you provide.
Dear Akshat Pravin Kulkarni
I think it is more useful to go through the enclosed article by the George Vander Voort, titled" Metallography of Magnesium and its Alloys" for better understanding since as it is a cleared that the "magnesium and its alloys, regardless of the processing procedures employed, are among the most difficult metallic specimens to prepare for microstructural examination also It is worth to concentrate on the displayed art in figure 2a and b and related texts.
Best regards
https://www.buehler.com/assets/solutions/technotes/vol4_issue2.pdf
@Mohammed Hussein j. H. Al'Atia, Thank you so much for the detailed answer, I'll refer to the metallography document.
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