Unlock instant, AI-driven research and patent intelligence for your innovation.

Functional chromium alloy plating from trivalent chromium electrolytes

A technology of trivalent chromium salt and electrolyte solution, which is applied in the direction of electrodes, etc., and can solve problems such as difficulty in obtaining coatings

Pending Publication Date: 2021-01-19
THE BOEING CO
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Implementing trivalent chromium on thin decorative plating has had some success, however, thicker or functional coatings remain difficult to obtain

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Functional chromium alloy plating from trivalent chromium electrolytes
  • Functional chromium alloy plating from trivalent chromium electrolytes
  • Functional chromium alloy plating from trivalent chromium electrolytes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0119] The components of Example 1 were mixed in a stepwise manner, with the chromium chloride hexahydrate and sodium oxalate mixed first, followed by the metal salt. The pH of Example 1 is about 2.2.

[0120]

Embodiment 2

[0122] The components of Example 2 were mixed in a stepwise manner, with the chromium chloride hexahydrate and sodium oxalate mixed first, followed by the metal salt. The component of embodiment 2 is similar to the component of embodiment 1, and difference is that the amount of ferrous sulfate heptahydrate increases 10 times compared with the component of embodiment 1. The pH of Example 1 is about 2.2.

[0123]

Embodiment 3

[0125] The components of Example 3 were mixed in a stepwise manner, with the chromium chloride hexahydrate and sodium oxalate mixed first, followed by the metal salt. The component of embodiment 3 is similar to the component of embodiment 1, and difference is to replace ferrous sulfate heptahydrate with ferric chloride in embodiment 3. The pH of Example 1 is about 2.2.

[0126]

[0127] image 3 is through figure 2 The image 300 of the substrates 310, 320, 330 and 340 coated with ferrochrome alloy formed by the method, each substrate was plated at different current densities using the electrolyte solution of Example 1. For each of the ferrochrome plated substrates 310, 320, 330, and 340, the plating parameters were: approximately 1 hour plating time while maintaining the electrolyte solution at a temperature of 30°C and a pH of approximately 2.2. The substrate 310 coated with chromium-iron alloy at 100mA / cm 2 Plating with a current density of 12 μm ferrochrome layer. ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention relates to functional chromium alloy plating from trivalent chromium electrolytes. Specifically, disclosed herein are electrolyte solutions for electro-deposition of chromium-iron alloysand methods of electro-depositing chromium-iron alloys. An electrolyte solution for electroplating can comprise a trivalent chromium salt, an oxalate compound, an iron salt, an aluminum sulfate, an alkali metal sulfate, and an alkali metal halide. An electrolyte solution can be formed by dissolving a trivalent chromium salt, an oxalate compound, an iron salt, an aluminum sulfate, an alkali metalsulfate, and an alkali metal halide in water or an aqueous solution. A method of electro-depositing chromium-iron alloys on a substrate can comprise a step of introducing a cathode and an anode into an electrolyte solution comprising: a trivalent chromium salt, an oxalate compound, an iron salt, an aluminum sulfate, an alkali metal sulfate, and an alkali metal halide. Electro-depositing can further comprise passing a current between the cathode and the anode through the electrolyte solution to deposit chromium and iron onto the cathode.

Description

technical field [0001] The present invention provides an electrolytic solution for electrodepositing chromium alloys, a method for forming the electrolytic solution, and a method for electrodepositing chromium alloys. Background technique [0002] Chrome plating is an electroplating method that provides a chromium coating on a substrate. Hard chrome plating provides a chromium coating with a thickness typically above about 10 microns, providing hardness and wear resistance to the coated substrate. Another type of chrome plating is decorative chrome plating, which provides a coating of chromium typically having a thickness of about 0.1 to about 0.5 microns. Chromium plating is usually performed using a bath containing chromic acid and a catalyst based on fluoride, sulfate or organic acid. Chromic acid has the hexavalent form of chromium, chromium (VI), which is not environmentally preferred and is expensive to dispose of. [0003] Trivalent chromium, which has good propert...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56
CPCC25D3/56C22C27/06C25D3/06C25D17/10
Inventor V·伊杰里S·P·盖多斯S·莫汗
Owner THE BOEING CO