Modelling of pitting corrosion in marine and offshore steel structures – A technical review

On the Propagation of Open and Covered Pit in 316l Stainless Steel

“…Then the metal was immersed in a 50 % nitric acid solution, giving rise to corrosion on the location of the scratch. Later on, after this passive film discovery, passivity breakdown phenomena like pitting corrosion were extensively analyzed for a lot of industrial applications like the nuclear waste disposition [3] or the resistance of offshore structures [4].…”

Corrosion Rate of Steels Dx51d and S220gd in Different Corrosion Environment

“…where P is penetration index, 24 represents hours on a day, 365 days number from an year, 1000 is the conversion factor of units; ρ is density of tested materials (ρ = 7.87 g/cm 3 ). From values of corrosion rate and penetration index of tested samples in different corrosive solutions it was evaluated corrosion tendency of steels DX51D and S220GD using corrosion stability coefficient values [16].…”

Anti-Collision Assessment and Prediction Considering Material Corrosion on an Offshore Protective Device

“…As shown in Table 2, no apparent pitting corrosion, weld crack, or steel plate punching was observed, implying that no severe local damage had occurred. Originally, undercoat and finishing had been painted on the protective device for anticorrosion purposes and a special undercoating containing Zn [26] was used in the tidal zone, as steel in this zone oxidized more severe than in other zones [5]. After years of immersion, however, rusting had occurred almost everywhere (see Figure 2), the coating retained little anticorrosion effect, meanwhile, corrosion and structural loss had occurred in almost every part of the protective device.…”

“…The upper triangle (with red color) in Figure 8 represents the maximum reaction force calculated with the new FE model, and it is evident that it matches the evolution trend well. The evolution trend of anti-collision performance follows a quadratic nonlinear relationship and is unlike the corrosion effect of the steel component, which is determined by a unique spot in the marine environment and is an approximately linear relationship [5]. To further investigate the corrosion response in the protective device, other impact factors were analyzed and verified by this simulation case, from which the corresponding data points and fitted curves are shown in Figure 9.…”

“…Many researchers have studied the mechanism of steel corrosion in marine and offshore environments. Jyoti et al [5] summarized previous research work and reported that temperature [6], pH value [7], salinity [8], dissolved oxygen [9], and water velocity [10] were the main physical factors that affected the corrosion responses of steel. Besides the investigation of corrosion factors, other studies have focused on mechanism optimization.…”