The Electrochemical Behavior of As-Prepared Aluminum Alloy A360 Produced by Selective Laser Melting Fabrication with and without a Trivalent Chromium Process Conversion Coating

Walton, Jack W.; Rice, Lucas; McFall-Boegeman, Sarah; Swain, Greg M.

doi:10.1149/1945-7111/aca8d6

The Electrochemical Behavior of As-Prepared Aluminum Alloy A360 Produced by Selective Laser Melting Fabrication with and without a Trivalent Chromium Process Conversion Coating

Journal Article · Mon Dec 19 23:00:00 EST 2022 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1945-7111/aca8d6· OSTI ID:1960533

^[1]; Rice, Lucas ^[2]; McFall-Boegeman, Sarah ^[1]; ^[1]

Michigan State Univ., East Lansing, MI (United States)
Kansas City Plant (KCP), Kansas City, MO (United States)

In this paper, we report on the electrochemical behavior and corrosion resistance of as-prepared aluminum alloy, A360 (AlSi10Mg), fabricated by additive manufacturing, with and without a trivalent chromium process conversion coating. Selective laser melting was the 3D printing process used for the alloy build. The corrosion suppression provided by the coating system was assessed through electrochemical measurements and accelerated degradation testing during a 14-day continuous neutral salt-spray exposure. The results indicate that the conversion coating can be formed by solution pretreating (degreasing and deoxidation) the alloy (X-Z plane perpendicular to the build plane) with its native surface roughness (as-prepared) followed by immersion for 10, 15 or 20 min in the coating bath. All three immersion times provide an equivalent level of corrosion protection to the alloy. The conversion coating suppresses both anodic and cathodic currents, increases the polarization resistance, and provides both anodic and cathodic corrosion protection to the as-prepared alloy. The conversion-coated specimens exhibit good stand-alone corrosion resistance during a 14-day neutral salt-spray exposure with corrosion intensity values (g/m²-year) ~10x lower than values for the uncoated, as-prepared alloy specimens.

View Accepted Manuscript (DOE)

Research Organization:: Kansas City Plant (KCP), Kansas City, MO (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); Honeywell Federal Manufacturing & Technologies

Grant/Contract Number:: NA0002839

OSTI ID:: 1960533

Report Number(s):: NSC-614-4426

Journal Information:: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 12 Vol. 169; ISSN 0013-4651

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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