Abstract
Sacrificial anode protection of stainless steel is required in severe application environment. In this paper, two kinds of Fe-based sacrificial anodes (20CrMo and 20CrMn) were used to protect 310S stainless steel. Protective effects were evaluated through constant current test and self-discharge test. Scanning electron microscope (SEM) and Energy Dispersive Spectrometer (EDS) were used to analyze the surface morphology and element composition of 310S cathodes after the tests. Experimental result indicates that both Fe-based sacrificial anodes have a driving voltage over 500mV, which enables a longer life than those of the Al-based or Zn-based anodes. The 20CrMo sacrificial anode presented more stable working potential, better state of activation and more uniform corrosion behavior than 20CrMn sacrificial anode did. The 310S cathode protected by 20CrMo had smoother surface and less oxide formation on the substrate.
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