Zinc-nickel composite plating bath, zinc-nickel composite plating film, mold and plating method
AssigneeHonda Motor Co., Ltd.
InventorsYuki Furukawa, Yoshimitsu Ogawa, Masahiro Yamanaka
Life of this patent
Estimating the term…
Abstract
This zinc-nickel composite plating bath contains a zinc source, a nickel source, silicon dioxide particles and an ammonium-based dispersant in such ranges that enable the achievement of a zinc-nickel composite plating film wherein the codeposition amount of nickel is 10-16 wt % and the codeposition amount of the silicon dioxide particles is 7 vol % or more. Meanwhile, the pH of this zinc-nickel composite plating bath is 5.6 to 6.8.
Claims7
A zinc-nickel composite plating bath comprising a zinc source, a nickel source, a silicon dioxide particle, and an ammonium-based dispersant for forming a zinc-nickel composite plating coating having a co-deposited nickel content of 10 to 16 Wt % and a co-deposited silicon dioxide particle content of 7 Vol % or more, wherein the zinc-nickel composite plating bath has a pH of 5.6 to 6.8, wherein the silicon dioxide particle has a scale-like shape or a dendritic shape.
A plating method for forming a zinc-nickel composite plating coating on a surface of a steel material to be plated,
- the plating method comprising:
- a degreasing step of removing an oil component from the surface to be plated;
- an etching treatment step of removing an oxide layer from the surface to be plated after oil component removal;
- a desmutting step of removing a water-insoluble metal component from the surface to be plated after oxide layer removal;
- and
- a plating step of subjecting the surface to be plated to an electroplating treatment using a zinc-nickel composite plating bath after metal component removal to form the zinc-nickel composite plating coating,
- wherein the zinc-nickel composite plating bath contains a zinc source, a nickel source, a silicon dioxide particle, and an ammonium-based dispersant, the zinc-nickel composite plating bath has a pH of 5.6 to 6.8, wherein the silicon dioxide particle has a scale-like shape or a dendritic shape, and the zinc-nickel composite plating coating has a co-deposited nickel content of 10 to 16 Wt % and a co-deposited silicon dioxide particle content of 7 Vol % or more.
Dependencies are inferred from the claim text.