High-performance corrosion-resistant high-entropy alloys

US11466344B2 · kind B2 · utility

Assignee

• Energy, United States Department of · US

Inventors

• Jeffrey A. Hawk · Corvallis, US
• Paul D. Jablonski · Salem, US
• Malgorzata Ziomek-Moroz · Albany, US
• Joseph H. Tylczak · Albany, US
• Michael C. Gao · Albany, US
• Alvaro A. Rodriguez · Oklahoma City, US

Key dates

• Filing date: Mar 5, 2020
• Grant date: Oct 11, 2022
• Expiry date: Jul 10, 2040

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C2200/00
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

This disclosure provides alloy compositions comprising the main constituent elements iron, nickel, cobalt, molybdenum, and chromium. In one embodiment, the alloy comprises 10.0 to 30.0 wt % iron; 30.0 to 60.0 wt % nickel; 10.0 to 25.0 wt % cobalt; 1.0 to 15.0 wt % molybdenum; 15.0 to 25.0 wt % chromium by weight; where the sum of iron and nickel is at least 50 wt %; and, where the balance comprises minor elements, the total amount of minor elements being about 5% or less by weight. The alloy compositions have use as coatings to protect metals and alloys from corrosion in extreme environments where corrosion is a major concern such as with exposure to sea water or sea water with CO2.