Corrosion-resistant plating system
AssigneeGM Global Technology Operations LLC
InventorsGuangling Song, William A. Schumacher
Life of this patent
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Abstract
Methods of providing a corrosion-resistant plating on a steel bumper are provided. A galvanized zinc layer is deposited over a steel substrate. A plurality of nickel layers is deposited over the zinc layer. The plurality of zinc layers has at least a first porosity and a second porosity. A chrome layer is applied over the plurality of nickel layers. The porous nickel layer is immediately adjacent the chrome layer such that a stress applied to the chrome layer is distributed over the porous nickel layer. The porous nickel layer delocalizes a stress applied at an impact area to a dispersed area and the dispersed area is larger than the impact area.
Claims20
A method of providing a corrosion-resistant plating on a steel bumper comprising:
- depositing a galvanized zinc layer over a steel substrate;
- depositing a plurality of nickel layers having at least a first porosity and a second porosity over the galvanized zinc layer;
- and
- applying a chrome layer over the plurality of nickel layers.
A method of mitigating corrosion on a steel bumper having a chrome layer and a bright nickel layer coated thereon, the method comprising:
- arranging a porous nickel layer immediately adjacent the chrome layer such that a stress applied to the chrome layer is distributed over the porous nickel layer, wherein the porous nickel layer delocalizes a stress applied at an impact area to a dispersed area and the dispersed area is larger than the impact area.
A bumper comprising:
- a steel substrate;
- a zinc layer;
- a plurality of nickel layers, wherein at least one nickel layer is porous;
- and
- a chrome layer.
Dependencies are inferred from the claim text.