Effect of temperature on corrosion kinetics in a TRIP steel welded joint with stainless steel filler metal.

Abstract

In the present work the results of the experimentation are shown, carried out by means of the evaluation of the behavior on the corrosion kinetics in a TRIP steel joint with stainless steel filler metal 308L applied to the automotive sector with different temperatures, focusing on the action of the induced corrosion and the passivation that generates the material. The experimentation starts from the welding of the weld material in a 10 cm x 8 cm x 0.8 cm polish, with welding parameters of 25V,165Amp, heat input 255.8 and a feed rate of 12.9mm/s. Once the welding was done, the piece was cut to be able to assemble it, characterize it and pass to the experimental stage in the solutions where the tests were carried out at different concentrations of 0.5mol, 1.0mol and 1.5mol, and subjected to 25°C, 50°C and 70°C, performing a test at 25°C. 50°C and 70°C, performing a total of nine experiments yielding results that allowed the comparison between each of the tests, where although pitting was found in the steel, these did not compromise the integrity of the piece, the surface oxide layer was not affected in the material. Based on the graphs obtained, the different concentrations of the solution showed variations in the activation zones and in the corrosion rate, affecting the cathodic zones differently. Therefore, the oxide layers on the steel and weld were superficial and disappeared when the sample was prepared, indicating that there was no significant internal damage.