Morphological and electrochemical characterization of electrodeposited Zn–Ag nanoparticle composite coatings

Journal Article · Fri Nov 15 04:00:00 EST 2013 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2013.08.017· OSTI ID:22288680

Punith Kumar, M. K.; Srivastava, Chandan

Silver nanoparticles with an average size of 23 nm were chemically synthesized and used to fabricate Zn–Ag composite coatings. The Zn–Ag composite coatings were generated by electrodeposition method using a simple sulfate plating bath dispersed with 0.5, 1 and 1.5 g/l of Ag nanoparticles. Scanning electron microscopy, X-ray diffraction and texture co-efficient calculations revealed that Ag nanoparticles appreciably influenced the morphology, micro-structure and texture of the deposit. It was also noticed that agglomerates of Ag nanoparticles, in the case of high bath load conditions, produced defects and dislocations on the deposit surface. Ag nanoparticles altered the corrosion resistance property of Zn–Ag composite coatings as observed from Tafel polarization, electrochemical impedance analysis and an immersion test. Reduction in corrosion rate with increased charge transfer resistance was observed for Zn–Ag composite coatings when compared to a pure Zn coating. However, the particle concentration in the plating bath and their agglomeration state directly influenced the surface morphology and the subsequent corrosion behavior of the deposits. - Highlights: • Synthesis of Ag nanoparticles with an average size of 23 nm • Fabrication of Zn/nano Ag composite coating on mild steel • Composite coatings showed better corrosion resistance. • Optimization of particle concentration is necessary.

• OSTI ID: 22288680
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Vol. 85; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COATINGS
CORROSION
CORROSION RESISTANCE
DEPOSITS
DISLOCATIONS
ELECTROCHEMISTRY
ELECTRODEPOSITION
MICROSTRUCTURE
MORPHOLOGY
NANOSTRUCTURES
PARTICLES
POLARIZATION
SCANNING ELECTRON MICROSCOPY
SILVER
STEELS
X-RAY DIFFRACTION