Abstract
The effects of reduced sulfur on the corrosion behavior of Alloy 600 MA were investigated in deaerated 0.01 M of sodium sulfate (Na 2SO 4), sodium tetrathionate (Na 2S 4O 6), and sodium thiosulfate (Na 2S 2O 3) solutions using potentiodynamic polarization and stress corrosion cracking (SCC) tests at 300 °C and 340 °C. The polarization curves of Alloy 600 MA showed a stable passivity in the Na 2SO 4 solution; however, the solutions of Na 2S 4O 6 and Na 2S 2O 3 showed accelerated anodic dissolution. The SCC susceptibility of Alloy 600 MA increased in the following order: in the Na 2S 2O 3, Na 2SO 4, and Na 2S 4O 6 solutions . Results of deposits and spectra taken from an energy dispersive X-ray system confirmed the existence of reduced sulfur.
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