couple

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The galvanic couple UC-Mg, and IA-Mg displayed similar current but still higher than the couple ZS-Mg at a more positive mixed potential.
Titanium alloy implants/prostheses processed under hydrogen-containing environments and under conditions in which galvanic couples or cathodic charging (impressed current) causes hydrogen to be evolved on metal surfaces may cause hydrogen induced cracking (HIC) [36-37] and the impairment of ductility of implant/prostheses permanently and irreversibly.