Codeposition Behavior of Zn-Ni-SiO2 Nanoparticles Composite Coatings from Sulfate Bath and Silane Coupling Treatment

Zinc nickel SiO 2 electrodeposits have been produced from an acid sulphate bath. The co deposition behavior of SiO 2 and the macrothrowing power of platings were examined. The presence of SiO 2 nanoparticles in the plating bath appears to change the alloy deposition behavior. The rate of nickel deposition was considerably decreased with SiO 2 nanoparticles in the bath. The macrothrowing power of plating was improved by adding the SiO 2 nanoparticles in the bath. At an early stage of electrodeposition, it seems that the SiO 2 nanoparticle acts as a nucleus of the precipitation. The SiO 2 nanoparticles did not disperse uniformly in a plating film, but distributed only in the SiO 2 rich layer with about 50 nm in thickness formed beneath the surface. In addition, this SiO 2 rich layer can improve the anticorrosive performance. Therefore, the zincic use can be suppressed, because the film thickness can be more thinned, compared with zinc and zinc nickel alloy electroplating.

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Effects of Silica Nanoparticle Co-Deposition on Macrothrowing Power of Zinc-Nickel Alloy Plating from an Acid Sulfate Bath

Hino

Murakami

Muraoka

et al. 2015

Mater. Trans.

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ZincnickelSiO 2 electrodeposits have been produced from an acid sulfate bath. The co-deposition behavior of SiO 2 and the macro throwing power of plating baths were examined. The presence of SiO 2 nanoparticles in the plating bath appears to change the alloy deposition behavior. The rate of nickel deposition was considerably decreased by the presence of SiO 2 nanoparticles in the bath. The macro throwing power of plating was improved by adding SiO 2 nanoparticles to the bath. At an early stage of electrodeposition, it seems that the SiO 2 nanoparticles act as a nucleus for the precipitation. The SiO 2 nanoparticles did not disperse uniformly in a plating film; they distributed only in a SiO 2 rich layer (³50 nm thick) that formed beneath the surface. In addition, this SiO 2 rich layer can improve anticorrosive performance. Therefore, zincic use can be suppressed because film thickness can be reduced compared to zinc and zincnickel alloy electroplating.

show abstract

Codeposition Behavior of Zn-Ni-SiO2 Nanoparticles Composite Coatings from Sulfate Bath and Silane Coupling Treatment

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Effects of Silica Nanoparticle Co-deposition on Macrothrowing Power of Zinc-Nickel Alloy Plating from an Acid Sulfate Bath

Effects of Silica Nanoparticle Co-Deposition on Macrothrowing Power of Zinc-Nickel Alloy Plating from an Acid Sulfate Bath

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