Influence of Residual Stress on the Corrosion Behaviors of Welded Structures in the Nature Seawater

Abstract

The corrosion behaviors of X65 welded structures were investigated, aiming to achieve the influence of residual stress on the corrosion behaviors of welded structures in the nature seawater. Methods such as corrosion rate measurement and corrosion morphology observation were used in the research. The results indicated that high-level of residual stress could accelerate the corrosion damage of weld joint, HAZ, and parent metal of welded structures, but had little influence on the overall corrosion rate of welded structures. Under the influence of different level of residual stress, corrosion morphology evolution on the surface of weld joint, HAZ, and parent metal were different, and so did the corrosion characteristics of the different areas of welded structures. Compared to the weld joint and parent metal, area with the most serious corrosion damage generated in the HAZ at last. Therefore, the HAZ needs to be significant concerned while designing the corrosion failure prevention measures of the welded structures.