Authors:

Evan Frishholz

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About Paper:

Advanced manufacturing techniques such as additive manufacturing and material coatings provide the ability to economically fabricate parts with complex geometries and specialized properties, however, before these materials can be used in industry their corrosion behaviors must be understood. To understand the behavior of additively manufactured stainless steel in chlorine environments additively manufactured and traditionally wrought stainless steel samples were electrochemically corroded in a 3.5wt% NaCl solution. To understand how aluminized and boronized stainless steel samples will corrode high temperature stagnation corrosion tests were performed in a molten eutectic MgCl2-NaCl-KCl mixture, and liquid sodium. Analyzing the potentiodynamic polarization and electrochemical impedance spectroscopy curves for both additively manufactured and traditionally wrought stainless steel showed a bilayer of passive films formed but metastable pitting was absent and passivation regions were weaker in the additively manufactured potentiodynamic curves. This behavior is likely a result of minimized MnS inclusions and non-uniformities in the microstructure generated in the additive manufacturing process. The high temperature corrosion samples were analyzed by energy dispersive X-ray spectroscopy. The boronized samples tended to be inert in molten salt and liquid sodium, however some cracks formed showing further investigation must be done to make the coating more ductile. The aluminized samples were slightly more reactive than the boron coated samples, potentially caused by pores created during the coating process, but cracking didn't occur showing the coating is more ductile the boronized coating. This information informs under what conditions advanced manufacturing techniques can be used.

Source:

Purdue University / 2023

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Co-authors:

Evan Frishholz