Research on Roughness Parameters of High Strength Steel and Weld Joint in Marine Environment

Abstract:

The surface roughness parameters of Q690 high strength steel and weld joint specimens were assessed through microscopic scanning tests to investigate the dynamic changes in corrosion morphology characteristics of high strength steel（HSS） within the ocean splash zone corrosive environment. These investigations encompassed the analysis of parameters such as the maximum height of surface peaks S_p， the maximum depth of surface valleys S_v， the skewness of surface profiles S_sk， and the kurtosis of surface profiles S_ku over varying periods of corrosion. Power function regression analyses and comparative assessments were conducted for each of these parameters. The results indicate that considering the differences in the scanning area of base material and weld joint of Q690 high strength steel， the corrosion degrees and characteristics can be accurately determined by analyzing the variation process of roughness parameters with corrosion time， so as to provide a new approach for damage assessment of domestically produced high strength steel in marine environments.