Abstract: Taking a natural gas purification plant in Sichuan as an example, the corrosion cause of the liquid sulfur storage tank was studied. The influence of H₂S, O₂, H₂O and other factors on corrosion was investigated by weight loss method and EDS analysis. The anticorrosion effect of hot spraying aluminum and zinc were studied simultaneously. The results showed that the corrosion of liquid sulfur to Q235 was slight without water. The major reasons for corrosion of top were H₂S dissolved in liquid membrane and sulfur deposition. The corrosion could be controlled by strengthening the top insulation, and metal spraying technology deserved further research.