Surface characteristics of 4340 steel treated by electrolytic plasma processing
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Surface cleaning, a crucial pretreatment for coating processes, is routinely used to remove impurities, rust, and mill scale from steel surfaces that inadvertently affect coating adhesion. Traditional surface cleaning techniques such as acid pickling or blasting, suffer from serious environmental problems. Besides these concerns, acid pickling can introduce hydrogen into the material during cleaning, causing premature failure in high-strength steels via hydrogen embrittlement (HE).
Electrolytic plasma processing (EPP) is a newly developed environmentally friendly technique for deep and large scale metal surface cleaning and coating with high efficiency, simplicity, and high process flexibility [1, 2, 3]. In this process, an electrical potential is applied between the workpiece (cathode) and a counter electrode (anode) in the presence of an aqueous electrolyte. Above a critical voltage, electrolysis takes place followed by fine hydrogen bubble formation and continuous arcing plasma...
KeywordsHydrogen Embrittlement Nuclear Reaction Analysis Surface Nanocrystalline Layer Film Physical Vapor Deposition Peak Center Position
This work was supported by SERDP (Strategic and Environmental Research and Development Program) Project NOO173-03-2113. The authors thank Drs. Haralabos Efstathiadis (Albany Nanotech Institute) for the Nuclear Reaction Analysis, Scott Grendahl (US Army Research Laboratory) for the hydrogen embrittlement testing and Eddie Daigle (CAP Technologies) for assisting with the electrolytic plasma processing of the samples.
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