The effect of gap configuration on crevice corrosion of 316L stainless steel in chloride-containing aqueous media

The article investigates the critical factors influencing crevice corrosion in 316L stainless steel, a material widely used in equipment operating in aqueous environments with chloride ions. It highlights the persistent risk of crevice corrosion in grade 316 steel, even in seawater applications, and the role of gap configurations in welded joints and biofouling layers. The study employs cylindrical vessels and multiple-crevice samples to examine the effects of gap width, temperature, and chloride ion concentration on corrosion behavior. Key findings include the significant impact of intermediate gaps and lack-of-fusion areas on crevice corrosion initiation and progression. The research also underscores the stochastic nature of crevice corrosion and provides practical recommendations for protecting welded joints from corrosion. Additionally, it explores the influence of groove depth in non-metallic sleeves on corrosion rates, offering insights into the diffusion restrictions and blockage effects within crevice gaps. The detailed metallographic analysis and experimental results presented in the article provide a comprehensive understanding of crevice corrosion mechanisms and their dependence on environmental and structural factors.