Actually 316L Stainless Steel is the alloy. So how i can calculate for its equivalent weight?
Dear Dr. Logesh Mahendran,
for a correct determination of the corrosion rate from the corrosion current, regarding the equivalent weight of 316L SS, I would refer to ASTM G102-89 (reapproved 1999) standard where these values are present in an attached table and and they are very accurate.
For alloys, the equivalent weight is more complex. It is usually assumed that the process of oxidation is uniform and does not occur selectively to any component of the alloy. If this is not true, then the calculation approach will need to be adjusted to reflect the observed mechanism. In addition, it is necessary to carefully choose the value of n (the number of electrons required to oxidize an atom of the element in the corrosion process, that is, the valence of the element) to be inserted in the calculation formula relatively to the elements in the alloy because many elements exhibit more than one valence value.
I believe that a equivalent weight value of 25.50 could provide acceptable results.
Best regards, Pierluigi Traverso
Dear sir
Thank you for your kind help. There are different classified equivalent weight has been given. But you recommended lowest one. Why? Why not any other?
Dear Dr. Logesh Mahendran,
my first suggestion is to calculate the value of the Equivalent Weight according to the rules in the cited standard. I then indicated the value plausible to me, as it corresponds to a rather common composition of the 316 L SS. Just to give you an idea of the calculations, I send you the link of a thesis from 2009 relating to a 304 SS, in which the above mentioned calculation was made in Appendix A, the final value of which you will see that does not differ much from that indicated in the first column of the table which is taken from ASTM - G 102 - 89 (Reapproved 1999). I also send you a second link, relative to a paper present in the conference proceeding, which indicates a "generic" value for the 316 SS (Tab.4).
Link1: https://harvest.usask.ca/bitstream/handle/10388/etd-11252009-125849/AniekanEtor-FinalThesis-3.pdf?sequence=1&isAllowed=y
Link2: https://inis.iaea.org/collection/NCLCollectionStore/_Public/31/051/31051118.pdf
For exact values, you have to do exactly the calculations in appendix A of the thesis ... following the indications of the regulation.
Good work and my best regards, Pierluigi Traverso
To find equivaent Weight,
1. Take percentage composition available in SS 316L for Cr, Fe, Ni, Mo and other available etc.
2. Multiply available percentage with equivalent weight of particular metal.
3. Sum it all up.
You will get equivalent weight for particular alloy.
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