Mitigation of galvanic corrosion in bolted joint of az31b and carbon fiber-reinforced composite using polymer insulation

Jiheon Jun; Yong Chae Lim; Yuan Li; Charles David Warren; Zhili Feng

doi:10.3390/ma14071670

Mitigation of galvanic corrosion in bolted joint of az31b and carbon fiber-reinforced composite using polymer insulation

Jiheon Jun, Yong Chae Lim, Yuan Li, Charles David Warren, Zhili Feng

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

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.

Original language	English
Article number	1670
Journal	Materials
Volume	14
Issue number	7
DOIs	https://doi.org/10.3390/ma14071670
State	Published - Apr 1 2021

Funding

Funding: This research was financially sponsored by the US Department of Energy Vehicle Technologies Office, as part of the Joining Core Program. Oak Ridge National Laboratory (ORNL) is managed by UT-Battelle, LLC, for the US Department of Energy under Contract DE-AC05-00OR22725.

Funders	Funder number
U.S. Department of Energy
Oak Ridge National Laboratory	DE-AC05-00OR22725

Keywords

Carbon fiber reinforced composite
Dissimilar material joint
Galvanic corrosion
Magnesium alloy
Mechanical joint integrity

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10.3390/ma14071670

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title = "Mitigation of galvanic corrosion in bolted joint of az31b and carbon fiber-reinforced composite using polymer insulation",

abstract = "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.",

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author = "Jiheon Jun and Lim, {Yong Chae} and Yuan Li and Warren, {Charles David} and Zhili Feng",

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AU - Warren, Charles David

AU - Feng, Zhili

PY - 2021/4/1

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N2 - 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.

AB - 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.

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Mitigation of galvanic corrosion in bolted joint of az31b and carbon fiber-reinforced composite using polymer insulation

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Keywords

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