عنوان مجله
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JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
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چکیده
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In this research, nanostructured Ni-Co coating was synthesized by reverse-pulse electrodeposition method
using Watts bath under both ultrasonic and stirring conditions. The grain refinement agent, sodium saccharin,
was added to the plating bath in order to achieve very fine grains for both coatings. The
microstructure, microhardness, and corrosion resistance of the prepared coatings were evaluated. The
ultrasonic treatment changed the texture, deposition rate, and chemical composition of the coating. A clear
increase was seen in the texture coefficient for all (200) planes. The corrosion resistance of the coatings was
analyzed by polarization and electrochemical impedance spectroscopy tests in 3.5 wt.% NaCl solution at
ambient temperature. Based on the results, the corrosion resistance of Ni-Co coating increased by 42%, the
microhardness decreased by 16%, and the film thickness increased from 20 to 30 lm as a result of applying
ultrasonic during electroplating, which can be attributed to the changes in composition and morphology of
the coating.
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