Study of Galvanic Corrosion Effect Between Metallic and Non-metallic Constituent Materials of Hybrid Composites
Hybrid composites have become popular nowadays in aircraft manufacturing industries because of its improved mechanical properties, corrosion resistance, and fatigue life. This work focuses the galvanic corrosion effect between a metallic and a non-metallic material in a hybrid composite and identifies better material choice. While choosing constituent materials we have to consider the electrochemical properties of materials, because the atmospheric moisture between these materials acts as an electrolyte and allows electrons to flow from higher electric potential material to lower electric potential material and initiate galvanic corrosion. Since we know that the deterioration rate due to corrosion process is proportional to the potential difference between the materials and concentration of the electrolyte, it can be controlled by proper selection of materials with a negligible potential difference or restricting the moisture absorption. An attempt for identifying low electric potential material, nine combinations of frequently used materials such as GFRP-Al, BFRP-Al, CFRP-Al, GFRP-Cu, BFRP-Cu, CFRP-Cu, GFRP-SS, BFRP-SS, and CFRP-SS were selected. These specimens were kept in NaCl solution for 90 days and during these periods the potential differences between the materials, weights, and mechanical strengths at room temperature were noticed. The tensile strengths of the materials before the corrosion process were compared with the materials during corrosion for three intervals of 30 days, and finally, the percentage of strength degradations were validated for the better selection of materials.
KeywordsGalvanic corrosion Fiber metal laminated hybrid composite Effects of corrosion on strength
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