Effects of NaCl Concentration and Solution Temperature on the Galvanic Corrosion between CFRP and AA7075T6
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To reduce structural weight, light metals, including aluminum and magnesium alloys, have been widelyused in various industries such as aircraft, transportation and automobiles. Recently, composite materialssuch as Carbon Fiber Reinforced Plastics (CFRP) and Graphite Epoxy Composite Material (GECM) havealso been applied. However, aluminum and its alloys suffer corrosion from various factors, which includeaggressive ions, pH, solution temperature and galvanic contact by potential difference. Moreover, carbonfiber in CFRP and GECM is a very efficient cathode, and very noble in the galvanic series. Galvanic contactbetween carbon fiber composites and metals in electrolytes such as rain or seawater, is highly undesirable. Notwithstanding the potentially dangerous effects of chloride and temperature, there is little research ongalvanic corrosion according to chloride concentration and temperature. This work focused on the effectsof chloride concentration and solution temperature on AA7075T6. The increased galvanic corrosion betweenCRFP and AA7075T6 was evaluated by electrochemical experiments, and these effects were elucidated.
Abstract
To reduce structural weight, light metals, including aluminum and magnesium alloys, have been widelyused in various industries such as aircraft, transportation and automobiles. Recently, composite materialssuch as Carbon Fiber Reinforced Plastics (CFRP) and Graphite Epoxy Composite Material (GECM) havealso been applied. However, aluminum and its alloys suffer corrosion from various factors, which includeaggressive ions, pH, solution temperature and galvanic contact by potential difference. Moreover, carbonfiber in CFRP and GECM is a very efficient cathode, and very noble in the galvanic series. Galvanic contactbetween carbon fiber composites and metals in electrolytes such as rain or seawater, is highly undesirable. Notwithstanding the potentially dangerous effects of chloride and temperature, there is little research ongalvanic corrosion according to chloride concentration and temperature. This work focused on the effectsof chloride concentration and solution temperature on AA7075T6. The increased galvanic corrosion betweenCRFP and AA7075T6 was evaluated by electrochemical experiments, and these effects were elucidated.
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