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Publication

The mechanism of (automotive) conversion layer formation on advanced high strength stainless steel (AHSSS)

Book - Dissertation

The increasing concerns of climate change and global warming have led automotive manufacturers to design lighter vehicles in order to lower CO2 emissions and fuel consumption. One strategy to achieve this goal is to design a very high strength material that can provide the same mechanical strength with less thickness. This has been the driving force for developing Advanced high Strength Stainless Steel (AHSSS) to lighten the total weight of the vehicle without compromising the safety of the passengers.

On the other hand, the automotive car body is covered by a multilayer coating system to possess a perfect visual appearance and also to be protected from severe environmental conditions. Each layer of this coating system has to impart a certain characteristic to the final car body. In view of this, the pretreatment layer is applied to enhance the corrosion resistance of the substrate and also to improve its adhesion for the application of the next layers.

The automotive manufacturers can benefit from the traditional phosphating process to more innovative and environmentally-friendly pretreatment systems based on their substrate and the local environmental rules. In all these cases, the compatibility of this new material with the most relevant pretreatment system is a key factor to take advantage of it in the automotive industry.

The objective of the current research is to unravel the behavior of this new substrate during two different conversion systems; the phosphating system as the most common pretreatment among the automotive industry and a novel and green system based on the Zr-aminosilane technology. This study has indicated that this material can be a potential alternative for car bodies by following a completely different mechanism than the traditional substrate during conversion treatment.
Number of pages: 181
Publication year:2022
Accessibility:Open