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AssigneeThe Boeing Company
InventorsVijaykumar S. IJERI, Om PRAKASH, Stephen P. GAYDOS
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In certain aspects, a coated steel substrate comprises a single or multiple-layer electroplated aluminum coating over a steel substrate. The multiple-layer electroplated aluminum coating comprises one or more porous layers and one or more compact layers. The one or more porous layers comprise a material selected from a group consisting of aluminum and aluminum alloys. The one or more compact layers comprise a material selected from a group consisting of aluminum and aluminum alloys. In certain aspects, a method of depositing a multiple-layer aluminum coating over a steel substrate includes electroplating one or more porous aluminum layers over the steel substrate. The one or more porous aluminum layers comprise a material selected from a group consisting of aluminum and aluminum alloys. One or more compact aluminum layers are electroplated over the steel substrate. The one or more compact aluminum layers comprise a material selected from a group consisting of aluminum and aluminum alloys.
A coated steel substrate, comprising:
A coated steel substrate, comprising:
The coated steel substrate of claim 16, wherein the multiple-layer electroplated aluminum coating is configured to provide sacrificial corrosion protection of over 1,000 hrs under ASTM B 117.
The coated steel substrate of claim 16, wherein the multiple-layer electroplated aluminum coating passes a hydrogen embrittlement (HE) test performed according to ASTM F 519 using Type 1a.1 specimens having a notch.
The coated steel substrate of claim 16, wherein the at least one porous layer is electroplated by direct current and wherein the at least one compact layer is electroplated by pulsed current, wherein the multiple-layer electroplated aluminum coating is configured to provide corrosion resistance to the steel substrate in neutral water and in salt water.
The coated steel substrate of claim 16, wherein the multiple layer aluminum coating has a thickness from about 10 μm to about 40 μm and provides sacrificial corrosion protection.
A component, comprising:
Dependencies are inferred from the claim text.