Research on accelerated corrosion of 0Cr18Ni9 stainless steel in marine atmospheric environment of the South China Sea

Abstract

Abstract The corrosion problem of metal materials in the South China Sea is serious. In order to meet the needs of rapid construction and development of islands and reefs in the South China Sea, it is necessary to establish a rapid evaluation method for the environmental adaptability of materials, which can provide effective guidance for material selection and corrosion control in marine engineering design. According to the atmospheric environment characteristics of islands and reefs in the South China Sea, an accelerated corrosion environment spectrum was designed, and then the atmospheric corrosion behavior in the South China Sea and the indoor accelerated corrosion test environment was studied. The correlation between indoor and outdoor corrosion was verified based on grey correlation analysis, and the prediction model of atmospheric corrosion based on indoor accelerated test results was established. The results show that the corrosion morphology, corrosion type and corrosion kinetic laws of 0Cr18Ni9 stainless steel under the indoor and outdoor test conditions had high similarity. Also, their correlation degree reached 0.8052, further indicating a good correlation between indoor and outdoor corrosion. The established prediction model had a relatively high accuracy (Level 2), and its prediction error to outdoor corrosion result was less than 26.13%.