Invention Grant
- Patent Title: Aluminum alloy products exhibiting improved bond durability and methods of making the same
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Application No.: US16168016Application Date: 2018-10-23
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Publication No.: US11649529B2Publication Date: 2023-05-16
- Inventor: Liangliang Li , Theresa Elizabeth MacFarlane , Sazol Kumar Das , Peter Lloyd Redmond , Changook Son , Dewei Zhu , Yudie Yuan , Luis Fanor Vega , Milan Felberbaum , Julio Malpica , Brian Paradis , Alp Manavbasi , Dechao Lin
- Applicant: Novelis Inc.
- Applicant Address: US GA Atlanta
- Assignee: NOVELIS INC.
- Current Assignee: NOVELIS INC.
- Current Assignee Address: US GA Atlanta
- Agency: Kilpatrick Townsend & Stockton LLP
- Main IPC: C22C21/00
- IPC: C22C21/00 ; B23K11/11 ; C23F1/00 ; C23F1/20 ; C23F17/00 ; C22F1/047 ; B21B1/46 ; C22C21/12 ; C22C21/02 ; C22F1/043 ; C22F1/053 ; B23K103/10 ; C22C21/08

Abstract:
Disclosed are aluminum alloy products and methods of making and processing such products. Thus, disclosed are aluminum alloy products exhibiting controllable surface properties, including excellent bond durability, low contact resistance, and corrosion resistance. Aluminum alloy products described herein include a migrant element, a subsurface portion having a concentration of the migrant element, and a bulk portion having a concentration of the migrant element. The aluminum alloy product comprises an enrichment ratio of 4.0 or less, wherein the enrichment ratio is a ratio of the migrant element concentration in the subsurface portion to the concentration in the bulk portion. Additionally, the aluminum alloy products surface and/or subsurface can contain phosphorus (e.g., elemental phosphorus or oxidized phosphorus). The phosphorus containing surface provides reduced electronic stress on an electrode tip of a resistance spot welding apparatus, and an extended service lifetime (e.g., weld cycles to failure) of the electrode tip.
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