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Meeting Materials Science & Technology 2020
Symposium Substrate Protection for Corrosion Prevention
Presentation Title Effect of Surface Coating and PTFE Tape Insulation on Galvanic Corrosion of AZ31B Bolt-joined with CFRP
Author(s) Charles David Warren, Jiheon Jun, Yong Chae Lim, Zhili Feng
On-Site Speaker (Planned) Yong Chae Lim
Abstract Scope Magnesium (Mg) alloys and carbon fiber reinforced polymer (CFRP) are of high interest for lightweight vehicles. Although bolting can achieve reliable joints for multi-materials auto-body structures, galvanic corrosion of Mg in contact with CFRP and steel bolt is a great concern. To mitigate galvanic corrosion, electrical isolation between Mg, CFRP and bolt was attempted. In this work, bolted specimens of AZ31B and CFRP were prepared with and without surface coating between AZ31B and CFRP. Polytetrafluoroethylene tape applied on the steel bolt as an insulation layer. Then, the bolted specimens were tested by 0.1M NaCl immersion and ASTM B117. Corrosion potential of the bolted samples with isolation in 0.1M NaCl was closer to Mg corrosion potential, suggesting weaker galvanic polarization. The corrosion depth measured on AZ31B in the joints was significantly smaller with isolation case. Lap shear tensile testing of the post-corrosion specimens with isolation showed less degradation of joint strength.
Proceedings Inclusion? Planned: At-meeting proceedings

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Advanced Composite Coating for Carbon Steel Corrosion Prevention
Characterizations of Corrosion Tested CFRC-AZ31B Joint by Friction Self-pierce Riveting Process
Corrosion Resistant Coatings on 6061 Aluminum
Effect of Surface Coating and PTFE Tape Insulation on Galvanic Corrosion of AZ31B Bolt-joined with CFRP
Enhancing Corrosion Resistance of Steel Substrates with Reduced Graphene Oxide Reinforced Polymer Composite Coatings
The Effect of Mg added Al-Si Coating on the Corrosion of Hot-stamped Boron Steels

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