Abstract
Corrosion behaviors of 304L stainless steel (SS) and 304L SS with oxides film (preoxidation 304L SS) in 1 g/L potassium permanganate solution of various pH values were investigated by using mass loss, electrochemical measurement and scanning electron microscope (SEM) observation. The results showed that mass loss of 304L SS increases with the increase of sodium hydroxide or nitric acid concentration in 1 g/L potassium permanganate solution. The polarization curves of 304L SS in potassium permanganate solution show that passive zones are destroyed more easily in acid potassium permanganate solution than alkaline potassium permanganate solution. The corrosion ability of acid potassium permanganate (NP) decontamination solution used for 304L SS is more aggressive than alkaline potassium permanganate (AP) solution. The oxide film on the surface of preoxidation 304L SS can be removed completely in two oxidation reduction decontamination cycles, oxidizing solution of which comprised 0.4g/L sodium hydroxide and 1g/L potassium permanganate. The 304L SS and preoxidation 304L SS performed alkaline oxidation reduction decontamination of 3 cycles were reoxidation. The micromorphology of reoxidation specimens was similar to preoxidation 304L SS. Therefore the chemical decontamination of alkaline oxidizing and acid reducing steps had no negative effect on corrosion of 304L SS and reoxidation of 304L SS carried out decontamination.
Highlights
Corrosion products are generated in the steam generators, loop piping, and other reactor internal surfaces during reactor operation [1–3]
The mass loss of 304L stainless steel (SS) after NP-N and alkaline potassium permanganate (AP)-N is shown in Figures 1 and 2, respectively
It is obvious that the mass loss of 304L SS after NP-N and AP-N decontamination increases in both cases with decontamination cycles
Summary
Corrosion products are generated in the steam generators, loop piping, and other reactor internal surfaces during reactor operation [1–3]. These corrosion products eventually comprise the source term of the crud in the reactor. The most crucial step for chemical decontamination to be successful is the removal of the Cr enriched layer of oxide. Resulting from a decontamination procedure performed, the corrosion rate of the metals may eventually be increased; to minimize the corrosion damage, the preparation of perfectly clean and passive surfaces in addition to a chemical decontamination is strongly recommended. The effect of oxidation decontamination steps on corrosion performance of 304L stainless steels (SS) was investigated. The pH of potassium permanganate solution is evaluated for the optimum removal of oxides and generating minimum corrosion of 304L SS
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