Microstructures of steels (Nital 2 etching).
M. Cabrini, S. Lorenzi, T. Pastore
CC BY 4.0
M. Cabrini et. al. "Corrosion Behavior of Carbon Steels in CCTS Environment", International Journal of Corrosion <a rel="nofollow" class="external text" href="https://doi.org/10.1155/2016/3121247">doi:10.1155/2016/3121247</a>