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Corrosion and environmental sensor response delays during monitored multi-droplet wetting: Unraveling time lags in atmospheric corrosion Vrije Universiteit Brussel

Vincent Vangrunderbeek, Keer Zhang, Leonardo Bertolucci Coelho, Fritz Friedersdorf, Rebecca Marshall, Yaiza Gonzalez-Garcia, Mats Meeusen, Annick Hubin, Herman Terryn, Mesfin Haile Mamme, et al.
This study investigates time lags between environmental changes, electrolyte formation, and atmospheric corrosion sensor responses under controlled multi-droplet wetting. A commercial corrosion and environmental sensor was combined with in-situ microscopy, and an Artificial Intelligence (AI)-based segmentation approach was applied to track droplet growth. A cross-correlation analysis identified and quantified time lags between Surface Relative ...

A fully coupled depth-dependent corrosion model for reinforced concrete piles under marine environmental conditions KU Leuven

Rishwanth Darun Annamalaisamy Sannasiraj, Konstantinos Gryllias, Dirk Vandepitte, Dimitrios Chronopoulos
The corrosion of reinforced concrete (RC) piles in marine conditions demands comprehensive modelling to mitigate risks and enhance structural safety. This study develops a fully coupled, depth-dependent multi-ion reactive corrosion model for RC piles based on poroelastic theory to capture the interactions of chloride ions, sulphate ions, and carbonation across distinct marine exposure zones (atmospheric, splash, tidal, and submerged). Model ...

Atmospheric corrosion of welded dissimilar T-joints made of steel and improvements in the corrosion prediction model KU Leuven

Burak Karabulut, Raf Dewil, Barbara Rossi
This paper investigates the corrosion behaviour of dissimilar T-joints made of duplex stainless steel and carbon steel under atmospheric environments. Stainless steel grade EN1.4062 was welded to two different carbon steel grades, S355J2 and P460NL2, via gas metal arc welding to form T-joints. The fabricated specimens were subjected to 12-month exposure tests in four mildly corrosive environments distributed across 3 different European ...

Monitoring atmospheric corrosion under multi-droplet conditions by electrical resistance sensor measurement Vrije Universiteit Brussel

Ehsan Rahimi, Nils Van den Steen, Herman Terryn, Arjan Mol, Y. Gonzalez-Garcia

This paper presents a novel approach to investigate atmospheric corrosion kinetics of carbon steel under multi-droplet conditions. A homemade climate chamber has been developed to accurately control and monitor environmental conditions, including temperature (T) and relative humidity (RH), during exposure. Carbon steel corrosion kinetics are monitored with a custom-designed Electrical Resistance (ER) sensor pair. Savitzky-Golay (S-G) based ...

Atmospheric corrosion of iron under a single droplet Vrije Universiteit Brussel

Ehsan Rahimi, A. Kosari, Nils Van den Steen, Axel Homborg, Herman Terryn, Arjan Mol, Y. Gonzalez-Garcia

Utilizing a dedicated micro-sized three-electrode cell, this study systematically investigates early-stage electrochemical properties and corrosion behavior of pure iron under single droplets. Various volumes and NaCl concentrations were considered during the evaporation-driven shape and concentration evolution of single droplets. The measurements disclosed that reducing the droplet size from 5 µL to 1.5 µL at 0.01 M NaCl concentration, ...

Impact of process parameters and gas atmospheres on density and microstructure of super duplex stainless steel produced by Laser Powder Bed Fusion KU Leuven

Michele Vanini, Samuel Searle, Kim Vanmeensel, Bey Vrancken
Super duplex stainless steel (2507 SDSS) is an alloy renowned for its excellent corrosion resistance and mechanical properties. This unique combination arises from a duplex microstructure characterized by austenite and ferrite. However, when processed using the laser powder bed fusion (LPBF) process, this steel contains only the ferritic phase due to the rapid cooling rates inherent in LPBF, which suppresses the formation of the austenitic ...

Exploring the potential of transfer learning in extrapolating accelerated corrosion test data for long-term atmospheric corrosion forecasting Vrije Universiteit Brussel

Vincent Vangrunderbeek, Leonardo Bertolucci Coelho, Dawei Zhang, Yiran Li, Yves Van Ingelgem, Herman Terryn

This study utilizes transfer learning (TL) to enhance long-term atmospheric corrosion predictions. Using a Fe/Cu galvanic-type sensor, we gathered data in a controlled SAE J2334 salt spray setting and transferred this to an uncontrolled outdoor environment. Among TL methods tested, freezing the initial layer and fine-tuning others at a lower rate was most effective. The approach excelled at forecasting outdoor corrosion behaviour using a ...

Carbon Capture by Amino Acid Materials KU Leuven

Dharmjeet Madhav, Veerle Vandeginste
The increased atmospheric CO2 concentration causes global warming, jeopardizing life equilibrium. Carbon capture, utilization, and storage (CCUS) has emerged as the main strategy to curb CO2 emissions and associated environmental impacts. CO2 capture with alkanolamine solvents is the most established strategy. However, they are toxic, energy-intensive, susceptible to corrosion, and risk oxidative degradation. Amino acid-based absorbents are ...

Study on the roles of bisulfite in the stress corrosion cracking of 7050-T7451 aluminum alloy in the thin electrolyte layer environment Vrije Universiteit Brussel

Mingtao Wang, Liwei Wang, Wendi Yang, Yuxi Liu, Herman Terryn

Effect of bisulfite (HSO3-) on the stress corrosion cracking (SCC) behavior of 7050-T7451 aluminum alloy in the thin electrolyte layer environment in the presence of Cl- is investigated. Addition of HSO3- inhibits the corrosion initiation but promotes the corrosion propagation and hydrogen uptake. With a quantitative calculation, the HSO3- is demonstrated to significantly facilitate the synergistic effect between stress, corrosion, and ...

The effect of pH on the corrosion protection of aluminum alloys in lithium-carbonate-containing NaCl solutions Vrije Universiteit Brussel

E. Michailidou, Peter Visser, Johannes M. C. Mol, A. Kosari, Herman Terryn, Kitty Baert, Y. Gonzalez-Garcia

The corrosion inhibiting effect of lithium carbonate has been studied over the pH range relevant for atmospheric corrosion conditions at the polymer/metal interface. It is demonstrated that lithium carbonate offers optimum corrosion protection under moderately alkaline conditions attributed to the formation of a protective layer identified as aluminum-lithium layered double hydroxide. It is proposed that an active-to-passive transition occurs ...