公开(公告)号：US11091653B2

公开(公告)日：2021-08-17

申请号：US16534493

申请日：2019-08-07

Applicant: The Boeing Company

Inventor： Vijaykumar S. Ijeri ,  Om Prakash ,  Stephen P. Gaydos ,  Raghavan Subasri ,  Kalidindi Ramachandra Soma Raju ,  Dendi Sreenivas Reddy

IPC: C09D5/08 ,  C08G77/58 ,  C09D183/14 ,  C23C18/12 ,  B05D3/02 ,  B05D7/14 ,  B05D7/00 ,  B05D3/06

Abstract: An alkoxysilane is contacted with water and an inorganic acid to form a first composition. A zirconium alkoxide is contacted with an organic acid to form a second composition. One or more alkoxysilanes and an organic acid are contacted with a mixture of the first and second compositions to form a sol-gel composition, to which a photoinitiator is added. The sol-gel composition has a ratio of a number of moles of silicon to a number of moles of zirconium (nSi/nZr) ranging from about 2 to about 10. The sol-gel composition is applied on a substrate (e.g., an aluminum alloy substrate) multiple times to form multiple sol-gel layers, and at least one of the sol-gel layers is cured by UV radiation. The multiple sol-gel layers are then thermally cured.

公开(公告)号：US10767274B2

公开(公告)日：2020-09-08

申请号：US15680326

申请日：2017-08-18

Applicant: THE BOEING COMPANY

Inventor： Stephen P. Gaydos ,  Vijaykumar S. Ijeri ,  Om Prakash ,  Trilochan Mishra ,  Raghuvir Singh ,  Shashi Kant Tiwari

IPC: C25D3/56 ,  C25D3/24 ,  C25D5/12 ,  C25D3/54 ,  C25D5/18 ,  B22F3/105 ,  C25D5/10

Abstract: The present disclosure provides electrolyte solutions for electrodeposition of zinc-iron alloys, methods of forming electrolyte solutions, and methods of electrodepositing zinc-iron alloys. An electrolyte solution for electroplating can include an alkali metal citrate, an alkali metal acetate, a citric acid, and glycine with a metal salt. An electrolyte solution can be formed by dissolving an alkali metal citrate, an alkali metal acetate, a citric acid, and glycine in water or an aqueous solution. Electrodepositing zinc-iron alloys on a substrate can include introducing a cathode and an anode into an electrolyte solution comprising an alkali metal citrate, an alkali metal acetate, a citric acid, and glycine. Electrodepositing can further include passing a current between the cathode and the anode through the electrolyte solution to deposit zinc and iron onto the cathode.

公开(公告)号：US10428226B2

公开(公告)日：2019-10-01

申请号：US15231617

申请日：2016-08-08

Applicant: The Boeing Company

Inventor： Vijaykumar S. Ijeri ,  Om Prakash ,  Stephen P. Gaydos ,  Raghavan Subasri ,  Kalidindi Ramachandra Soma Raju ,  Dendi Sreenivas Reddy

IPC: C09D5/08 ,  C23C18/12 ,  C08G77/58 ,  C09D183/14 ,  B05D3/06 ,  B05D7/14 ,  B05D3/02 ,  B05D7/00

Abstract: An alkoxysilane is contacted with water and an inorganic acid to form a first composition. A zirconium alkoxide is contacted with an organic acid to form a second composition. One or more alkoxysilanes and an organic acid are contacted with a mixture of the first and second compositions to form a sol-gel composition, to which a photoinitiator is added. The sol-gel composition has a ratio of a number of moles of silicon to a number of moles of zirconium (nSi/nZr) ranging from about 2 to about 10. The sol-gel composition is applied on a substrate (e.g., an aluminum alloy substrate) multiple times to form multiple sol-gel layers, and at least one of the sol-gel layers is cured by UV radiation. The multiple sol-gel layers are then thermally cured.

公开(公告)号：US10421869B2

公开(公告)日：2019-09-24

申请号：US15431506

申请日：2017-02-13

Applicant: The Boeing Company

Inventor： Vijaykumar S. Ijeri ,  Om Prakash ,  Stephen P. Gaydos ,  Raghavan Subasri ,  Kalidindi Ramachandra Soma Raju ,  Dendi Sreenivas Reddy

IPC: C09D5/08 ,  C09D7/65 ,  C09D7/80 ,  C09D5/10 ,  C09D183/08 ,  C23C18/12 ,  C08K3/18 ,  C08K3/28 ,  C08K3/32

Abstract: A layered tetravalent metal phosphate composition (e.g., a layered zirconium phosphate composition) and a first corrosion inhibitor (e.g., cerium (III), a vanadate, a molybdate, a tungstate, a manganous, a manganate, a permanganate, an aluminate, a phosphonate, a thiazole, a triazole, and/or an imidazole) is dispersed in an aqueous solution and stirred to form a first solution. A precipitate of the first solution is collected and washed to form a first corrosion inhibiting material (CIM), which includes the first corrosion inhibitor intercalated in the layered tetravalent metal phosphate composition. The first CIM is added to a first sol-gel composition to form a first CIM-containing sol-gel composition. The first CIM-containing sol-gel composition is applied on a substrate to form a CIM-containing sol-gel layer, cured by UV radiation, and thermally cured to form a corrosion-resistant coating. One or more additional sol-gel composition may be applied on the substrate.

公开(公告)号：US20190211215A1

公开(公告)日：2019-07-11

申请号：US16355625

申请日：2019-03-15

Applicant: The Boeing Company

Inventor： Vijaykumar S. Ijeri ,  Om Prakash ,  Stephen P. Gaydos ,  Raghavan Subasri ,  Kalidindi Ramachandra Soma Raju ,  Dendi Sreenivas Reddy

IPC: C09D5/10 ,  C23C18/12 ,  C23F11/173 ,  C23F11/06 ,  C23C22/83 ,  C23C22/68 ,  B05D3/06 ,  C23C22/66

Abstract: A corrosion-resistant coating on an aluminum-containing substrate such as an aluminum substrate, an aluminum alloy substrate (e.g., AA 2024, AA 6061, or AA7075), or other aluminum-containing substrate includes a corrosion inhibitor-incorporated Zn—Al layered double hydroxide (LDH) layer and a sol-gel layer. A zinc salt and a corrosion inhibitor (e.g., a salt of an oxyanion of a transition metal such as a vanadate) is dissolved to form a zinc-corrosion inhibitor solution, and the substrate is immersed in or otherwise contacted with the solution to form the corrosion inhibitor-incorporated Zn—Al LDH layer on the substrate. A sol-gel composition is applied on the corrosion inhibitor-incorporated Zn—Al LDH layer of the substrate to form a sol-gel layer, and the sol-gel layer is cured.

公开(公告)号：US20180355498A1

公开(公告)日：2018-12-13

申请号：US15618850

申请日：2017-06-09

Applicant: The Boeing Company

Inventor： Vijaykumar S. Ijeri ,  Om Prakash ,  Stephen P. Gaydos ,  Nitin Pandurang Wasekar ,  Govindan Sundararajan ,  Dameracharla Srinivasa Rao

IPC: C25D3/56 ,  C25D5/10 ,  C25D5/18 ,  C22C38/12 ,  B32B15/01

CPC classification number: C25D3/562 ,  B32B15/011 ,  B32B15/015 ,  B32B2255/06 ,  B32B2255/205 ,  C22C38/12 ,  C25D5/10 ,  C25D5/18

Abstract: An electrolyte solution for iron-tungsten plating is prepared by dissolving in an aqueous medium a divalent iron salt (e.g., iron (II) sulfate) and an alkali metal citrate (e.g., sodium citrate, potassium citrate, or other alkali metal citrate) to form a first solution, dissolving in the first solution a tungstate salt (e.g., sodium tungstate, potassium tungstate, or other potassium tungstate) to form a second solution, and dissolving in the second solution a citric acid to form the electrolyte solution. An iron-tungsten coating is formed on a substrate using the electrolyte solution by passing a current between a cathode and an anode through the electrolyte solution to deposit iron and tungsten on the substrate.