Galvanic corrosion of AZ31B joined to dual-phase steel with and without Zn layer by ultrasonic and friction stir welding

Jun, Jiheon; Joshi, Vineet V.; Crawford, Alasdair J.; Viswanathan, Vilayanur; Leonard, Donovan N.; Chen, Jian; Updadhyay, Piyush; Lim, Yong Chae; Feng, Zhili

doi:10.1016/j.jma.2023.01.016

Galvanic corrosion of AZ31B joined to dual-phase steel with and without Zn layer by ultrasonic and friction stir welding

Journal Article · Tue Jan 31 23:00:00 EST 2023 · Journal of Magnesium and Alloys

DOI:https://doi.org/10.1016/j.jma.2023.01.016· OSTI ID:1959620

^[1]; Joshi, Vineet V. ^[2]; ^[2]; ^[2]; ^[3]; ^[3]; Updadhyay, Piyush ^[2]; ^[3]; ^[3]

Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Galvanic corrosion of AZ31B joined with bare or Zn-coated DP590 steel by ultrasonic spot welding or linear friction stir welding was quantitatively studied by pre-defining anode and cathode in the lap joint samples. Corrosion volume and depth from Mg anode surfaces exposed to 0.1 M sodium chloride solution was analyzed as functions of cathode surface type and welding method. Characterization of as-welded joints was performed to identify any microstructural feature of the bonding zone that could impact galvanic corrosion behavior. COMSOL modeling with modified user subroutine was conducted to simulate the progression of Mg corrosion in the same joint and electrode configurations used for the corrosion experiments. The experimental results indicated that Zn-coated cathode surface can reduce Mg galvanic corrosion significantly as galvanic polarization and cathodic current on Zn-coated surface remained relatively low for Mg in the weld joints. COMSOL modeling described the growth of Mg galvanic corrosion in a reasonable manner but showed limitation by underestimating the corrosion volume as it did not capture self-corrosion.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1959620

Alternate ID(s):: OSTI ID: 1969030

Journal Information:: Journal of Magnesium and Alloys, Journal Name: Journal of Magnesium and Alloys; ISSN 2213-9567

Publisher:: National Engineering Research Center for Magnesium Alloys of ChinaCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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Galvanic corrosion of AZ31B joined to dual-phase steel with and without Zn layer by ultrasonic and friction stir welding

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