The electrochemical behavior of 304 stainless steel has been thoroughly investigated in H_2SO_4 as a function of H_2SO_4 concentration, chloride ions concentration, molybdate ions concentrations, and tungstate ions concentration at room temperature. Standard corrosion techniques that have been employed include Tafel measurements, R_p vs. time measurements, cyclic polarizations measurements, and the critical pitting potential measurements. In addition, the EIS technique was used. Initial results indicate that the addition of molybdate and tungstate ions at sufficient concentrations enhances both the resistance to general corrosion and to pitting corrosion in the presence of chloride ions. Based on the polarization and EIS measurements, a mechanism for corrosion inhibition is suggested.
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