Abstract
The influence of hydrodynamic flow, nickel tungstate (NiWO4) dosage, immersion duration, self-healing, and synergistic effect of NiWO4 and 5-mercapto-1-phenyl-1H-tetrazole nanocomposite film deposited on Cu surface were studied. The film thickness of ~2 µm showed excellent adhesion to Cu surface as proved by ASTMD 3359 – 97 standard adhesion tape test and extended immersion duration with 96.5% protection efficiency achieved under flow. SEM and electrochemical techniques revealed a more enhancement of Cu protection against pitting corrosion of chloride ion with a self-healing effect observed on a scratched portion of the coating in the presence of the composite compound, unlike the bare Cu surface.
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