Pitting Corrosion of 410 Stainless Steel in HCl Solutions

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Krell, Paul D
Corrosion; Pitting; HCl; 410 Stainless Steel; Oil Refining; 410; Metallurgy; Other Materials Science and Engineering; Structural Materials
project description
410 stainless steel (SS) is a material used in HCl services, such as distillation column trays in oil refineries. Unlike other alloys, however, the oil refining industry lacks a good reference for the corrosion rate of 410 SS at the varying HCl concentrations and temperatures the material might experience as trays in crude unit distillation columns. The goal of this project is to fill that knowledge gap. The corrosion behavior of 410 SS in HCl environments of pH 0.50, 1.25, 2.25, 3.25, and 4.25 at temperatures of 38, 52, 79, and 93°C was investigated using several methods. Cyclic potentiodynamic polarization experiments were performed to determine the pitting potential, repassivation potential, and open circuit potential of 410 SS in different environments, temperature ramping experiments were performed to determine the critical temperature of 410 SS at various HCl concentrations, and exposure experiments were performed to observe pitting behavior over several days. The results are summarized in a graph with temperature and pH axis that groups environments into metastable pitting, activing pitting, and uniform corrosion of 410 SS. This easy to use graph will aid industry in material selection choices.