What are the methods to be followed for the corrosion behaviour at lab scale?
The process of hanging the sample can be a possible way. However, certain area exposure is not possible for small component (say for disc sample of having dia 8mm and 5mm thickness).
Suggest any other alternative way for immersion test of aluminium alloy.
Dear Dr. Neeraj Kumar Bhoi ,
I suggest you to follow the regulation ASTM G 31 – 72 (Reapproved 1999) - Standard Practice for Laboratory Immersion Corrosion Testing of Metals.
You can have a look at the following web-site: https://www.google.it/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwjzncv4t6XuAhXQPsAKHYYFCuQQFjAAegQIBRAC&url=https%3A%2F%2Fwww.researchgate.net%2Fprofile%2FMohammed_Hussein_J_H_Alatia%2Fpost%2FWhat_are_the_proper_volume_and_time_period_or_intervals_for_weight_loss_measurements_for_mild_steel_corrosion_test%2Fattachment%2F5adaca994cde260d15da0e1f%2FAS%253A617723440660480%25401524288153812%2Fdownload%2FG31.pdf&usg=AOvVaw15XywHLXiXWoCULqI2Qj1y
Following the standard according to my needs (e.g. ambient temperature of a static fluid) I used, for exposure in free corrosion at different exposure times, on samples of Al alloys smaller than yours, simple beakers where I suspended the sample, inserted with an edge in a small rubber ring (minimizing the contact surface to reduce crevice corrosion phenomena) in turn tied to a fishing line held on the top of the beaker by a glass rod ...
If you need special details, let me know.
My best regards, Pierluigi Traverso.
For Al and Mg alloys and composites, hanging is only the best way for the Immersion test but the significant results can be obtained only if the minimum sample is 25mm dia and 5mm thick with a minimum of 5mm dia hole for hanging tape. The 5mm hole dia can be completely cleaned for a prompt weighing. Neeraj Kumar Bhoi
Kindly check https://www.sciencedirect.com/topics/physics-and-astronomy/corrosion-tests
Also check https://nvlpubs.nist.gov/nistpubs/Legacy/IR/nbsir79-1919.pdf
And https://www.fs.fed.us/rm/fire/wfcs/tests/documents/stp_tm05.pdf
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