The safety and efficiency of boilers are tightly related to the performance of boiler tube. 20G steel is widely used in the manufacturing of boiler tube. The corrosion behaviors of 20G exposed in precipitated sodium sulfate under high temperature/ pressure were investigated experimentally. Samples are placed in a setup for corrosion and subsequently analyzed by scanning electron microscope, energy dispersive spectroscopy (SEM / EDS) analysis and X-ray diffraction (XRD). The results indicate that the mass fraction of Fe elements on the surface decreases with time from 86.50% (t = 24 h) to 75.75% (t = 72 h). In the range of experiment temperature, higher temperature has positive effect on the formation of crystal structures.
Keywords boiler tube, water side corrosion, high temperature, sodium sulfate