Hello,
For the purpose of studying the effect of graphene oxide on the durability of concrete specimens embedded with steel bars. cylindrical specimens manufacturated were subjected to corrosion test. The electrochemical behavior of the specimens was evaluated using linear polarization impedance technique and open circuit voltage. After one year of measuring the current density (Icorr) of the samples, there were some samples indicating that the current density (Icorr) was between 0.1 and 0.5 (µA/cm2) which segnificate a low corrosion rate range. However, after opening the specimens and extracting the steel bars, they were found in good condition, without any kind of corrosion and rust.
The question is whether there could be transparent rust or white?
Thanks for your attention
Sometimes some elements like Nickel and/or copper might favourize the formation at steel surface of a stable oxide layer. These effect is used for weathering steels which are specifically designed to resist against atmospheric corrosion. Perhaps that you could be confronted to such phenomenon. You can check this link for more info : https://www.ispatguru.com/weathering-steels/
Very low corrosion rate need not leave any visible mark. Medium to high corrosion rates would/may leave some marks.
May be a very stable oxide layer. Just some metals have that like Nb.
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