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US 2026/0152838 A1Published application
Oxidized and boronized layers for corrosion resistance
AssigneeGM Global Technology Operations LLC
InventorsBenjamin Everest Slattery, Cara Lynn Learman, Kevin P. Callaghan
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Abstract
Corrosion resistance brake rotors, vehicle with such brake rotors, and methods for forming corrosion resistant products are provided. A method includes boronizing a surface of a ferrous metal component to form an iron boride layer on the surface; and steam treating the ferrous metal component to form an iron oxide layer on the iron boride layer.
Claims20
A method for forming a corrosion resistant product, the method comprising:
- boronizing a surface of a ferrous metal component to form an iron boride layer on the surface;
- and
- steam treating the ferrous metal component to form an iron oxide layer on the iron boride layer.
A brake rotor comprising:
- a ferrous metal body;
- an iron boride layer on the ferrous metal body;
- and
- an iron oxide layer on the iron boride layer, wherein the iron oxide layer forms a corrosion-resistant braking surface.
1 more element
A vehicle comprising:
- a propulsion system configured to provide motive torque to wheels;
- and
- a braking system for braking rotation of the wheels, wherein the braking system comprises a brake rotor, and wherein the brake rotor comprises:
- a ferrous metal body having an outer surface;
- an iron boride layer formed on the outer surface of the ferrous metal body, wherein the iron boride layer comprises diiron boride (Fe2B) phases, and wherein the iron boride layer has a thickness of from 0.02 millimeters to 2.5 millimeters,
- an oxide layer formed on the iron boride layer, wherein the oxide layer is a magnetite oxide layer, wherein the iron boride layer has a thickness of from 10 microns to 50 microns;
- and wherein the iron oxide layer forms a corrosion-resistant braking surface.
4 more elements
Dependencies are inferred from the claim text.