Estudio y caracterización de la sensibilidad a la corrosión por picadura del acero A-572 soldado y tratado térmicamente

Abstract

In the present work was developed an analysis the behavior of the pitting corrosion and of a metallographic analysis in structural steel ASTM A572 welded and heat treated. Welding parameters were obtained from a WPS already carried out because this project is complementary, resulting that the welding was approved. Applying an accelerated corrosion environment, 3 plates were obtained, previously welded and heat treated, with a temper of stress relief, annealing, and another without any heat treatment. We obtained 8 test pieces from each samples respectively, each test pieces was submerged in ferric chloride with a concentration of 5% by weight according to ASTM G48-11, every certain period of time, weight data and macrographs of them are taken, observing how the bites are generated. Once this period was over, the loss of mass for each sample was analyzed, which makes it easier for us to obtain the corrosion rate. Finally, hardnesses and metallographies are obtained for their respective analysis. The pitting depth and corrosion area are other aspects analyzed for to have a vision of how all the corrosion was generated throughout the study time. These results demonstrate that the properties of structural steel were affected by the presence of corrosion for all samples, allowing us to conclude that the tempered specimens are the most affected and the anneals behave better against corrosion.