Comparative analysis of corrosion mass loss of SKK490 and Q345 steel pipe piles in marine conditions

Vietnamese seawater, characterized by high chloride concentrations, presents unique challenges for corrosion in steel materials used in marine environments. This study conducts a comparative analysis of corrosion-induced mass loss in SKK490 and Q345 steels, commonly employed in steel pipe piles for coastal and offshore structures, under simulated Vietnamese seawater conditions. Accelerated corrosion tests were carefully designed with controlled factors, including temperature, humidity, and chloride concentration, using a simulated seawater solution containing 3.5% NaCl to replicate real-seawater conditions. Steel samples were partially immersed and connected to an external power source to accelerate the corrosion process over duration of 72 to 240 hours. The results show that Q345, containing protective elements like Nb, V, and Ti, exhibits better corrosion resistance, with a corrosion rate 1.32 times lower than SKK490. The findings underscore the need for material selection prioritizing corrosion-resistant steels or the application of protective measures such as coatings or cathodic protection. Additionally, the research provides valuable data for optimizing the design and durability of marine infrastructure in Vietnam. Future research should validate these results through long-term field studies and explore advanced anti-corrosion technologies.