Electrochemical impedance characteristics and degradation behaviors of carbon fiber reinforced composite attacked by HF solution.

Purpose: The purpose of this study is to ensure the safe use of carbon fiber composite pressure vessels in the nuclear industry environment. Design/methodology/approach: This study investigated the degradation behaviors of carbon fiber reinforced composite (CFRP) using the specific corrosive media HF solution, with a focus on the damage to the surface epoxy layer. The degradation behaviors of CFRP in HF solution were examined by electrochemical methods and surface characterization, using HCl, NaCl and NaF solution for comparison. Findings: The results showed that the specimen in HF solution will have a value of |Z|_{0.01 Hz} one order of magnitude lower, a substantially lower contact angle, more breakage of the surface epoxy and the stronger O─H peak and weaker C─O─C peak in the Fourier transform infrared spectrum, indicating severe hydrolytic damage to the surface epoxy. Originality/value: The work focuses on the degradation damage to CFRP surface epoxy by specific corrosive media HF. [ABSTRACT FROM AUTHOR]