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Corrosion properties of powder bed fusion additively manufactured 17-4 PH stainless steel

Corrosion

Schaller, Rebecca S.; Taylor, Jason M.; Rodelas, Jeffrey R.; Schindelholz, Eric J.

The corrosion susceptibility of a laser powder bed fusion (LPBF) additively manufactured alloy, UNS S17400 (17-4 PH), was explored compared to conventional wrought material. Microstructural characteristics were characterized and related to corrosion behavior in quiescent, aqueous 0.6 M NaCl solutions. Electrochemical measurements demonstrated that the LPBF 17-4 PH alloy exhibited a reduced passivity range and active corrosion compared to its conventional wrought counterpart. A microelectrochemical cell was used to further understand the effects of the local scale and attributed the reduced corrosion resistance of the LPBF material to pores with diameters ≥50 μm.

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TYPE Journal Article YEAR 2017
ScopusOSTIDOI

Corrosion properties of powder bed fusion additively manufactured stainless steels

Materials Science and Technology Conference and Exhibition 2017, MS and T 2017

Schaller, Rebecca S.; Taylor, Jason M.; Rodelas, Jeffrey R.; Mishra, Ajit; Schindelholz, Eric J.

Metal additive manufacturing (AM) has recently become a desirable process for complex parts across a broad range of applications. However, AM materials often have a varied microstructure due to non-equilibrium solidification conditions. While some adjustments have been made in manufacturing to enhance mechanical traits, very little attention has been directed at understanding the corrosion properties of these materials. The microstructural characteristics of the AM materials may lead to reduction in the corrosion resistance of the AM alloys compared to their conventional counterparts. This presentation explores the corrosion susceptibility of AM stainless steels in aqueous sodium chloride environments as well as industry relevant solutions. Further detailed corrosion studies combined with microstructural characterization provide insight into the microstructural influences on corrosion.

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TYPE Conference Poster YEAR 2017
ScopusOSTIDOI

The influence of salt loading density on the atmospheric corrosion of aluminum

NACE - International Corrosion Conference Series

Schaller, Rebecca S.; Schindelholz, Eric J.; Taylor, Jason M.

Corrosion of aluminum and aluminum alloys under atmospheric exposure has been well documented for outdoor conditions. While these studies expose the effects of environmental severity they do not explicitly establish the dependence of corrosion rate on salt loading. Accelerated laboratory studies have shown that initial corrosion rates are generally higher with higher salt loadings, but, over time corrosion appears to effectively stifle for low loadings of NaCl (<100 μg/cm2) under fixed humidity conditions. This has previously been attributed to the stability or passivation of the surface that is pH and, in turn, CO2 dependent. Another possible explanation could be the gettering of NaCl by corrosion product leading to surface drying and depletion of the corrosion aggressor. This paper explores the effects of selected NaCl loading densities vs. exposure time of UNS A91100 at both the macro and micro scale to illuminate the possible mechanisms leading to corrosion stifling. Through this work, an understanding of the relationship between corrosion in atmospheric systems versus the variation of a specific environmental severity factor, NaCl loading density, will be further developed.

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TYPE Conference Poster YEAR 2017
ScopusOSTI
Results 51–75 of 77
Results 51–75 of 77