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

Burak Karabulut
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 ...

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 ...

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

Keer Zhang, Ehsan Rahimi, Nils Van Den Steen, Herman Terryn, Arjan Mol, Yaiza 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, Keer Zhang, Ali Kosari, Nils Van Den Steen, Axel Homborg, Herman Terryn, Arjan Mol, Yaiza 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, ...

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, Ali Kosari, Herman Terryn, Kitty Baert, Yaiza 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 ...

Predicting the effect of droplet geometry and size distribution on atmospheric corrosion Vrije Universiteit Brussel

Nils Van Den Steen, Yaiza Gonzalez-Garcia, Herman Terryn, Yves Van Ingelgem
A new approach is proposed to numerically predict and study atmospheric corrosion for ranging droplet size distributions and the influence of the droplet geometry. The proposed methodology allows for a corrosion prediction based on observed droplet size distributions and droplet contact angles. A mechanistic finite element model, including oxygen transport and Butler-Volmer kinetics, is solved in order to obtain the current density as a function ...