4.3 Article

Electroplating and characterization of Cr-Al2O3 nanocomposite film from a trivalent chromium bath

Journal

ANTI-CORROSION METHODS AND MATERIALS
Volume 61, Issue 4, Pages 205-214

Publisher

EMERALD GROUP PUBLISHING LTD
DOI: 10.1108/ACMM-12-2012-1227

Keywords

Coatings and linings; Nanocomposite; Al2O3 nanoparticle; Corrosion resistant; Trivalent chromium; Electrodeposition; Thick films

Funding

  1. Sharif University of Technology [7100.14592]

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Purpose - The main aim of this study was to improve current efficiency and to obtain thicker coatings via aluminum oxide (Al(2)O3) addition to the chromium (Cr) (III) bath. Design/methodology/approach - Pure Cr and nanocomposite Cr-Al2O3 coatings were electrodeposited from Cr (III) bath onto cathode copper substrates by conventional method. Dependence of current efficiency to current density, Al(2)O3 content and particle size were investigated. Findings - Current efficiency increased with Al2O3 amount and decreased with Al2O3 particle size. Maximum current efficiency was achieved at 25 A/dm(2) for pure Cr and 30 A/dm(2) for composite coatings. Al2O3 bath content, current density and stirring rate increased the coating Al2O3 weight per cent significantly. Addition of Al3+ bath composition inhibited nanoparticle agglomeration, increasing film homogeneity. Cr-Al2O3 nanocomposites showed higher microhardness and better corrosion resistance than pure Cr layer. Originality/value - Cr (III) is not as toxic and as carcinogenic as Cr (VI) which is widely used for Cr electroplating these days. Low current efficiency and poor product quality are, however, major drawbacks of the former. This paper describes significant improvements obtainable by addition of Al2O3 nanoparticles to the Cr (III) bath for increasing the microhardness, the corrosion resistance and the current efficiency of the deposition.

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