Recent progress in understanding filiform corrosion on organic coated steel: A comprehensive review

Organic coatings delamination and corrosion pose an ongoing challenge in materials science. This review explores the knowledge of corrosion mechanisms in painted steel structures up to date, focusing on filiform corrosion (FFC) investigating its mechanisms, and discussing available prevention strategies alongside their suitability. First reported in the 1940s, FFC garnered significant attention in the subsequent decades, particularly in the study of coated aluminum, and very recently magnesium alloys. However, its consideration as a component of steel degradation remained comparatively limited during this period. Despite advancements, comprehensive analysis of FFC has been infrequent, prompting a call for an updated critical analysis. This survey emphasizes the necessity for organized FFC mitigation strategies, discussing alternatives and emerging trends. It underscores FFC’s potential role as a precursor to general corrosion, emphasizing the economic implications of aesthetic damage. This review aims to fill gaps, assess current knowledge, and pave the way for future research in the realm of organic-coated steel corrosion.