Evaluation of Ti-6Al-4V surface treatments for use with a polyphenylquinoxaline adhesive

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Abstract
Three surface treatments for Ti-6Al-4V adherends were evaluated using a thermoplastic polymer monoether polyphenylquinoxaline, MEPPQ, which had been shown in previous studies to have good potential as a high temperature adhesive for aerospace applications. Initial results based on long term thermal exposure at 232°C (450°F) using the phosphate-fluoride (PF) and chromic acid anodized (CAA) treatments with MEPPQ adhesive were not encouraging. A significant improvement in strength retention and a change in failure mode (cohesive) at 232°C (450°F) was found for the sodium hydroxide anodization (SHA) treated specimens when compared to the PF and CAA treated specimens. Although an improvement in long term thermal durability was obtained with the SHA treatment of Ti-6Al-4V, a change in failure mode from cohesive to adhesive was noted for the RT tests after 12 months exposure at 232°C (450°F). Such a change is indicative of a degradation of the adhesive-adherend interface. An improved surface treatment with better long term durability is still required for aerospace applications.

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