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Article

Mitigation of Galvanic Corrosion in Bolted Joint of AZ31B and Carbon Fiber-Reinforced Composite Using Polymer Insulation

1
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
2
Energy and Transportation Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
*
Authors to whom correspondence should be addressed.
Author note: Charles David Warren retired since February 2020.
Academic Editor: Mirco Peron
Materials 2021, 14(7), 1670; https://doi.org/10.3390/ma14071670
Received: 26 January 2021 / Revised: 16 March 2021 / Accepted: 17 March 2021 / Published: 29 March 2021
(This article belongs to the Special Issue Mechanical and Metallurgical Characterizations of Advanced Alloys)
The use of polymer insulation to mitigate galvanic corrosion was examined for bolted joints of AZ31B Mg alloy and carbon fiber-reinforced composite. To assess the corrosion behaviors of bolted joints with and without polymer insulation, solution immersion and salt spray exposure (ASTM B117) tests were conducted, and the corrosion depths and volumes were determined for the joint specimens after the tests. The polymer-insulated bolted joints exhibited much lower corrosion depths and volumes, highlighting the effective mitigation of galvanic corrosion. The reductions of joint strength in the post-corrosion joint specimens were relatively small (up to ~10%) in the polymer-insulated group but greater (up to 90%) in the group with no insulation. Cross-sectional characterization of post-corrosion joints with polymer insulation revealed local pits developed on AZ31B under galvanic influence, indicating that limited galvanic attack (that did not decrease the joining integrity significantly) could still occur during a long salt spray exposure (~1264 h) owing to the permeation of an aqueous corrosive medium. View Full-Text
Keywords: dissimilar material joint; carbon fiber reinforced composite; magnesium alloy; galvanic corrosion; mechanical joint integrity dissimilar material joint; carbon fiber reinforced composite; magnesium alloy; galvanic corrosion; mechanical joint integrity
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MDPI and ACS Style

Jun, J.; Lim, Y.C.; Li, Y.; Warren, C.D.; Feng, Z. Mitigation of Galvanic Corrosion in Bolted Joint of AZ31B and Carbon Fiber-Reinforced Composite Using Polymer Insulation. Materials 2021, 14, 1670. https://doi.org/10.3390/ma14071670

AMA Style

Jun J, Lim YC, Li Y, Warren CD, Feng Z. Mitigation of Galvanic Corrosion in Bolted Joint of AZ31B and Carbon Fiber-Reinforced Composite Using Polymer Insulation. Materials. 2021; 14(7):1670. https://doi.org/10.3390/ma14071670

Chicago/Turabian Style

Jun, Jiheon, Yong C. Lim, Yuan Li, Charles D. Warren, and Zhili Feng. 2021. "Mitigation of Galvanic Corrosion in Bolted Joint of AZ31B and Carbon Fiber-Reinforced Composite Using Polymer Insulation" Materials 14, no. 7: 1670. https://doi.org/10.3390/ma14071670

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