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公开(公告)号：US20200040433A1
公开(公告)日：2020-02-06
申请号：US16347757
申请日：2016-11-04
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Abstract: According to aspects of the present disclosure, a method includes obtaining a first amount of magnesium, a second amount of manganese, and a third amount of a cathodic poison and combining the magnesium, the manganese, and the cathodic poison to thereby form a kinetically hindered magnesium alloy includes less than 1 part by weight of manganese and less than about 5 parts by weight of cathodic poison based on 100 parts of the kinetically hindered magnesium alloy. The cathodic poison is configured to inhibit a cathodic reaction when combined with the magnesium.
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Patent Agency Ranking
公开(公告)号：US11255006B2
公开(公告)日：2022-02-22
申请号：US16509001
申请日：2019-07-11
Applicant: GM Global Technology Operations LLC
Abstract: A steel alloy workpiece and a method for making a press-hardened steel (PHS) component using the steel alloy workpiece is provided. The steel alloy workpiece includes between about 1.0 and 5.0 weight percent chromium, between about 0.5 and 2.0 weight percent silicon, and a surface having a predetermined imprinted pattern. The imprinted pattern includes one of a plurality of overlapping nested sinusoidal waves and a honey-comb pattern, and ascribes a surface roughness of between about 1.0 microns and 2.5 microns. The method includes providing the steel alloy workpiece, heating the workpieces at a predetermined time and temperature, hot stamping the workpieces into the PHS component, quenching the PHS component at a predetermined quench rate, and e-coating the PHS component. The e-coating is applied directly onto the surface of the PHS component.
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公开(公告)号：US20200157665A1
公开(公告)日：2020-05-21
申请号：US16509001
申请日：2019-07-11
Applicant: GM Global Technology Operations LLC.
Abstract: A steel alloy workpiece and a method for making a press-hardened steel (PHS) component using the steel alloy workpiece is provided. The steel alloy workpiece includes between about 1.0 and 5.0 weight percent chromium, between about 0.5 and 2.0 weight percent silicon, and a surface having a predetermined imprinted pattern. The imprinted pattern includes one of a plurality of overlapping nested sinusoidal waves and a honey-comb pattern, and ascribes a surface roughness of between about 1.0 microns and 2.5 microns. The method includes providing the steel alloy workpiece, heating the workpieces at a predetermined time and temperature, hot stamping the workpieces into the PHS component, quenching the PHS component at a predetermined quench rate, and e-coating the PHS component. The e-coating is applied directly onto the surface of the PHS component.
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公开(公告)号：US20190119793A1
公开(公告)日：2019-04-25
申请号：US15792440
申请日：2017-10-24
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Yang Guo , Ming Liu , Anil K. Sachdev
IPC: C22C23/02
CPC classification number: C22C23/02
Abstract: Magnesium-aluminum corrosion-resistant alloys are provided and include magnesium, aluminum, germanium, small amounts of cathodic reaction active site impurities such as iron, copper, nickel, and cobalt, manganese, and optionally tin. The alloy can include up to about 0.75% germanium, at least about 2.5% aluminum, up to about 2.25% tin, at most 0.0055% iron impurities, and at most 0.125% silicon impurities. The ratio of germanium to iron can be less than 150. The ratio of manganese to iron can be at least 75. The alloy can comprise one or more intermetallic complexes, including magnesium-germanium, magnesium-aluminum, and aluminum-manganese internietallic complexes.
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公开(公告)号：US20190062926A1
公开(公告)日：2019-02-28
申请号：US15690329
申请日：2017-08-30
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Mahmoud Abd Elhamid , Yang Guo , Ming Liu , Anil K. Sachdev
IPC: C23F13/02
Abstract: A method is provided for reducing the corrosion rate of surfaces of formed magnesium or magnesium alloy articles in which the formed surface contains small embedded particles of iron. By exposing the iron particle-containing formed surface to an acidic, aqueous solution comprising alkali metal fluoride ions at a temperature of between 20° C. and 30° C., an adherent passivating layer of MgF2 is formed. Further, such exposure to the acidified, aqueous, fluoride ion-containing solution reduces or eliminates the concentration of cathodic, corrosion-promoting, iron-containing particles on the article surface as the magnesium fluoride layer is being formed. The development of the passivating layer reduces corrosion in a water-containing environment, and even if the passivating MgF2 layer is breached, the reduction in surface iron-containing particles reduces the inherent corrosion rate of the article.
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公开(公告)号：US10711330B2
公开(公告)日：2020-07-14
申请号：US15792440
申请日：2017-10-24
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Inventor： Yang Guo , Ming Liu , Anil K. Sachdev
IPC: C22C23/02
Abstract: Magnesium-aluminum corrosion-resistant alloys are provided and include magnesium, aluminum, germanium, small amounts of cathodic reaction active site impurities such as iron, copper, nickel, and cobalt, manganese, and optionally tin. The alloy can include up to about 0.75% germanium, at least about 2.5% aluminum, up to about 2.25% tin, at most 0.0055% iron impurities, and at most 0.125% silicon impurities. The ratio of germanium to iron can be less than 150. The ratio of manganese to iron can be at least 75. The alloy can comprise one or more intermetallic complexes, including magnesium-germanium, magnesium-aluminum, and aluminum-manganese intermetallic complexes.
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