Análisis del comportamiento frente a la corrosión del Acero Austenítico 304 2B sumergido en un medio salino con baja concentración de Azufre y sometido a cargas monotónicas (flexión).

Abstract

The selection of Stainless Steels for the construction of useful structures in buildings, due to the aesthetics, mechanical properties, and high corrosion resistance presented by this material, especially in the coastal region, where the percentage of salinity is considerable, deserve the study of Austenitic Stainless Steel 304-2B through the test of standardized specimens, which are submerged in a salt environment with low sulfur concentration and under certain parameters established in the ASTM G 39-16 standard. The presence of the sulfur in the solution allows characterizing the behavior that this type of Stainless Steel could face in a possible emission of ash from the volcanoes existing in the Highland region. The experimental technical study compiled data about the corrosion rate, depth of corrosion and types of corrosion that they are generated in the specimens subjected to specific loading stresses, in order to evaluate the changes in the microstructure of the material, hardness and mechanical behavior at the end of the study. The tests of hardness, chemical composition, macrographs, metallography and electron microscopy were used to determine the behavior of this type of steel under the established conditions. In spite of the high corrosion resistance of stainless steels of this type, it was observed the presence of corrosion by pitting and intergranular corrosion at one end of the specimen subjected to a lower load. The central zone of the specimens, which was exposed to the loading stresses, did not present any type of corrosion.