A unique coating strategy composed of dual-purpose coating is developed as a potential solution for hydrogen embrittlement prevention in metals. This is achieved by extreme high-speed laser application (EHLA) which can introduce thin layers of mechanically sound metallic coating on metal substrates without inducing fusion zones. The coating strategy consists of a top coat and a bond coat on top of the substrate. The top coat acts as a hydrogen permeation barrier aiming to stop hydrogen from diffusing into the substrate. The underlying bond coat has a high hydrogen solubility aiming to capture and retain any remaining hydrogen that might have diffused through the top coat. Metallographic examination such as scanning electron microscopy and electron backscattered diffraction are used to characterize coating integrity. General insights in improving coating quality with processing and materials selections are discussed for future scalable applications.

Subject
Coating application, Coatings, Materials, Top coats, Substrates, Nickel based alloys, Porosity, Interfaces, Metals, Lasers, Powders, Stainless steel, Hydrogen
Keywords:
coating, hydrogen embrittlement, laser deposition, EHLA
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2023
Association for Materials Protection and Performance (AMPP)
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