The generation of active disinfectants by electrochemical processes gains market share due to the lack of need for transportation and storage of dangerous goods as well as the ease of operation. Usually, the process involves the use of specific electrodes for electrolysis of water to produce active chlorine species, sometimes supported by the addition of chlorides to the process water. Thus, the influence on the corrosion behavior can vary widely.

The susceptibility of AISI 304 stainless steel to crevice corrosion on the effect of contact with electrochemically active fluids was investigated using exposure and stepwise potentiostatic polarisation. Crevice materials made up of 304 SS and Polyether ether ketone (PEEK) forming two kinds of crevices including 304 SS-to-PEEK and 304 SS-to-304 SS were tested, and results indicate that 304 SS specimen is strongly susceptible to crevice corrosion in 304 SS crevice former assembly. The combination of the influence of oxidant and chloride concentration were examined in detail, and results indicate a strong influence of free chlorine and chloride concentration to crevice corrosion. The corroded surface morphology was investigated using scanning electron microscope(SEM), Energy Dispersive X-ray (EDX) and Confocal microscope.

Subject
Scanning electron microscopy, Water, Materials, Electrochemical testing, Corrosion initiation, Corrosion products, Crevices, Corrosion behavior, Fluids, Crevice corrosion, Chlorine, Chlorides, Breakdown potential
Keywords:
Electrochemically active fluids, disinfectants, stainless steels, crevice corrosion, electrochemical characterization
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2019
Association for Materials Protection and Performance (AMPP)
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