http://dspace.mist.ac.bd:8080/xmlui/handle/123456789/283 2026-04-26T00:20:28Z 2026-04-26T00:20:28Z AHMED, KHALID http://dspace.mist.ac.bd:8080/xmlui/handle/123456789/1062 2025-12-10T12:11:18Z 2024-12-01T00:00:00Z

CORROSION BEHAVIOR INVESTIGATION OF MARINE GRADE MILD STEELS IN THE BAY OF BENGAL WATER ENVIRONMENT AHMED, KHALID The corrosion behavior of marine-grade mild steels in seawater environments is a critical factor influencing the maintenance and longevity of marine structures such as vessels, offshore platforms, and coastal installations. Despite extensive research in various oceanic regions, the specific challenges posed by the Bay of Bengal (BoB) have not been fully explored, particularly for marine-grade steels. These steels, distinct in their alloying elements, may exhibit unique corrosion behaviors in the BoB's dynamic and chemically complex environment. This study aims to address this gap by investigating the corrosion behavior of two types of marine-grade mild steels, Grade A and Grade 907, under both static and dynamic conditions. The research employed laboratory-based experiments using gravimetric and electrochemical methods to measure corrosion rates of seamless and welded steel samples. These samples were immersed in seawater collected from multiple BoB locations, with exposure times ranging from initial immersion to extended submersion. Additionally, mechanical testing, including tensile strength and hardness assessments, was conducted to evaluate the degradation in material properties due to corrosion. Microstructural analysis using Optical and Scanning Electron Microscopy (SEM) revealed significant changes in the crystalline structure of the steel samples, indicating the extent of corrosion damage. Results indicate that dynamic conditions significantly accelerate corrosion rates, especially in deeper regions of the BoB, where the corrosion activity was higher than in coastal areas. Welded samples exhibited greater susceptibility to localized corrosion, suggesting a need for enhanced protective measures in these areas. The mechanical tests revealed a measurable reduction in hardness and more pronounced corrosion-induced damage in welded joints, highlighting the need for enhanced protection strategies in these marine areas. These findings highlight the necessity for region-specific corrosion protection strategies tailored to the unique environmental conditions of the BoB. By concentrating on the water composition of the Bay of Bengal, solutions to reduce corrosion in marine-grade mild steels particularly in this region can be developed. Also, a wider understanding of corrosion behavior in marine environments will come out. CORROSION BEHAVIOR INVESTIGATION OF MARINE GRADE MILD STEELS IN THE BAY OF BENGAL WATER ENVIRONMENT

2024-12-01T00:00:00Z