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Letter 32031
Suitable etchant for al6061
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I am a Final year undergraduate student in Singapore and I am
working on Al6061-T6 alloy. I am having problems in getting optical
microscopy (my objective is to get the grain size of the alloy). I
tried different etchants (Kellers, Poultons, NaOH solution, HF dilute
solution) and electropolishing (5 ml HBF4 (48%)+200 ml Water) but I
am not having success, in return I get a micrograph which contain
lots of black particles and "bubbles" in the picture for every
etchants I tried.
Before doing any processing (ECAE), I preheat the as received
al6061 to 415 degree for 3 hr and then cool down to RT.(I wonder if
my heat treatment is the cause of the problem, can anyone tell me?)
I would like to know which is the best and suitable etchant and
step by step procedure for this case? Thank you very much if you can
reply me asap. I really need your help.
p/s: if anyone is interested in my micrograph, which I don't know
what is that in the picture, it is here.

Regards,
Thomas ong
NTU, SG - Singapore
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