Location: Palmerston Lecture Theatre, The Spark, Southampton Solent University, East Park Terrace, SO14 0YN
This event features two talks on corrosion relevant to the maritime sector and is a joint lecture with the Institute of Corrosion, Wales and South-West Branch.
Tackling Bracket Corrosion in Marine Boiler Superheaters: Challenges and Solutions
Bracket corrosion in superheaters of marine boilers is a serious concern. Superheaters are critical components of the boiler system, as they increase the temperature of the steam produced by the boiler, ensuring its efficiency in driving turbines. These components are subjected to high pressures and temperatures, making them prone to various types of corrosion, including bracket corrosion. This specific corrosion typically affects the supports or brackets that hold the superheater tubes in place.
This presentation will offer an insight into the potential corrosion mechanisms that can be encountered, focusing specifically on the various forms of degradation that can affect their structural integrity. From high-temperature corrosion and stress corrosion cracking to corrosion under insulation, each mechanism poses distinct challenges to boiler performance and safety. Through a detailed exploration of these processes, we will examine the factors that contribute to corrosion, such as water chemistry and operational stresses. Furthermore, we will discuss effective prevention strategies, including proper maintenance practices, advanced materials, protective coatings, and water treatment techniques, aimed at mitigating these risks and enhancing the longevity and efficiency of marine boilers.
Corrosion performance of wire and arc additive manufactured 316L stainless steel with and without stress-relief heat treatment
Wire and Arc Additive Manufacturing (WAAM), a Direct Energy Deposition process, is particularly suitable for the manufacturing of large metallic structures several metres in size. In recent years, the mechanical performance of WAAM-manufactured parts has been extensively studied. However, their corrosion performance has received only limited attention and needs further investigation since the maritime sector would greatly benefit from this new manufacturing process.
It is expected that such a microstructure will alter the corrosion behaviour compared to 316L SS manufactured using traditional methods. In this work, the corrosion performance of as fabricated and heat-treated WAAM 316L is investigated using potentiodynamic polarizations in a 3.5 wt.% NaCl test solution and compared with wrought 316L SS. The heat treatment consists of a two-hour dwell at 900℃ for stress relief and air-cooling at room temperature. Corroded surfaces were analysed using optical, scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS).
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