Corrosion Resistant Bimetal via Friction Stir Additive Manufacturing
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Solution Overview
Problem
Conventional sacrificial anodes used for corrosion protection face issues such as loss of electrical contact due to mechanical fastening, material limitations, and inability to protect smaller or legacy parts, leading to ineffective corrosion prevention and increased maintenance costs.
Innovation Solution
A corrosion-resistant bimetal is created using frictional stir additive manufacturing (FSAM) to attach sacrificial anodes to metal components via metallic bonds, allowing for any suitable metal composition and built-in protection of small or legacy parts without mechanical fasteners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sacrificial anodes are mechanically fastened to metal components, then electrical contact can be established, but electrical contact is lost over time leading to ineffective corrosion protection
Solution Approach 1:
The patent merges the sacrificial anode material directly with the metal component through friction stir additive manufacturing, creating a unified bimetal structure where the anode and component are metallurgically bonded rather than mechanically fastened. This eliminates the interface between separate parts that causes contact loss, ensuring continuous electrical contact for the entire service life of the anode.
Solution Approach 2:
The patent replaces the mechanical fastening system with a metallurgical bonding process. Instead of using mechanical fasteners that can loosen or fail, the friction stir additive manufacturing process creates a direct metallic bond between the sacrificial anode material and the base metal component, eliminating mechanical connection failures.
2Reliability
If conventional sacrificial anodes are used, then corrosion protection can be provided, but material composition is limited by mechanical fastening requirements
Solution Approach 1:
The patent changes the material parameter flexibility by using friction stir additive manufacturing, which allows any metal or alloy composition to be used for the sacrificial anode without being constrained by mechanical fastening compatibility. The process enables precise control of material composition and properties.
Solution Approach 2:
The patent creates a composite bimetal structure where the sacrificial anode material is metallurgically bonded to the base metal component. This composite structure allows optimization of each material for its specific function while maintaining strong electrical and mechanical connection.
3Reliability
If mechanical fasteners are used to attach sacrificial anodes, then electrical contact can be established, but smaller parts cannot be protected
Solution Approach 1:
The patent replaces the mechanical fastening system with friction stir additive manufacturing, which can deposit sacrificial anode material directly onto small parts without requiring mechanical fasteners. This process is scalable from large structures to small components, enabling corrosion protection across all size ranges.
Solution Approach 2:
The patent applies local quality by using friction stir additive manufacturing to deposit sacrificial anode material precisely where needed on the metal component surface. The process can target specific areas or entire surfaces, providing flexible corrosion protection tailored to the local requirements of each part, regardless of size.
4Reliability
If sacrificial anodes are mechanically fastened, then corrosion protection can be provided, but maintenance costs increase due to contact loss
Solution Approach 1:
The patent uses friction stir additive manufacturing to create a metallurgical bond that exceeds the requirements of simple mechanical attachment. This excessive bonding action ensures permanent electrical contact throughout the anode's entire service life, eliminating the need for maintenance related to contact loss and reducing overall maintenance costs.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method maintains electrical contact until the sacrificial anode is depleted, extends the life of metal parts, reduces repair costs, and provides effective corrosion protection for a wider range of applications, including small and legacy parts.
Implementation Method 1
attaching the sacrificial anode to a metal component of the part with a metallic bond to form a crystalline solid that includes the sacrificial anode and metal component of the part
Implementation Method 2
Sacrificial anodes are created from a metal or metal alloy with a more negative electrochemical potential than the structural metal being protected... thereby oxidizing completely before the ship metal begins to oxidize
Data Source
AI summary
A corrosion resistant bimetal includes a part and one or more sacrificial anodes. The part includes a metal component that is susceptible to corrosion. The sacrificial anodes consists of an attachment to the part through a metallic bond between the metal component and the sacrificial anode to form a crystalline solid that includes the sacrificial anode and the metal component of the part.