Corrosion rate of a Al alloy is going to be tested in NaCl medium. Weight loss method is going to be used. All the specimens are solid bar shaped of cylindrical bar. Should I just prepare solution (1M NaCl) normally or change pH adding HCl/NaOH?
If you add acid or alkali to your test solution, you will speed up the corrosion of the aluminum several times over. You cannot compare acidic or basic NaCl solution with neutral NaCl solution, these are completely different corrosion media.
Dear sir Arpon Podder
Here is our reference about corrosion test in NaCl medium, and the corrosion test was done by weigh loss method. Generally, NaCl has pH about 7 (neutral). The use of NaCl is because we want to conditionally the corrosion environtment if in base/salt condition. Based from our research, the corrosion medium is just NaCl solution. The NaCl solution is prepared already like usual. Thank you
It all depends on what assumptions you have for your research. If in a neutral solution, an aqueous solution without additives is sufficient. If you want to control the resistance range of the alloy, you can slightly lower and increase the pH relative to neutral (pH 7). But of course, without exaggeration.
If you change the pH, try to keep the ionic strength of the solution constant so that the conditions are comparable.
Regards
Stefan
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