Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of trivalent chromium coating and preparation method thereof

A technology of trivalent chromium and coating, applied in the field of trivalent chromium coating and its preparation, can solve the problems of poor resistance to impurities, corrosion of plating tank, dark surface, etc., and achieve good blackening degree, dense coating and low porosity. Effect

Active Publication Date: 2020-01-03
WINSTAR CHEM SHANGHAI
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, a lot of work has been done on the research of trivalent chromium plating solution at home and abroad. Among them, the replacement of hexavalent chromium plating solution with trivalent chromium plating solution has been gradually popularized and applied in decorative chrome plating, but the research on trivalent chromium electroplating black chromium is relatively limited. less, and basically all of them are chloride systems, which have poor impurity resistance, serious corrosion of the plating tank caused by chlorine gas at the anode, and difficult maintenance of the plating solution. Moreover, the current black chromium coating still has a dark surface and poor brightness , high porosity of the coating, poor corrosion resistance and poor bonding between the coating and the substrate, etc.

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
  • A kind of trivalent chromium coating and preparation method thereof
  • A kind of trivalent chromium coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0027] In order to solve the above technical problems, the first aspect of the present invention provides a method for preparing a trivalent chromium coating, which at least includes the following steps: immersing the substrate in a trivalent chromium electroplating solution, and using the substrate as a cathode for Electroplating, electroplating temperature is 20 ~ 45 ℃, current density is 6A / dm 2 ~25A / dm 2 , the electroplating time is 5 to 30 minutes; the trivalent chromium coating is plated on the substrate; the surface of the substrate includes at least one conductive layer;

[0028] The trivalent chromium electroplating solution at least includes the following components: trivalent water-soluble chromium salt: 15-20 parts by weight; cobalt salt: 12-16 parts by weight; conductive salt: 20-35 parts by weight; complexing agent: 4-6 parts by weight; buffering agent: 7-10 parts by weight; blackening agent: 0.5-1.6 parts by weight; brightener: 0.01-0.5 parts by weight; deioniz...

Embodiment 1

[0089] Embodiment 1 provides a preparation method of a trivalent chromium coating, at least including the following steps: immersing the substrate in a trivalent chromium electroplating solution, electroplating with the substrate as a cathode, the electroplating temperature is 20°C, and the current density 6A / dm 2 , the electroplating time is 5min; the trivalent chromium coating is plated on the substrate; the surface of the substrate contains at least one conductive layer;

[0090] The trivalent chromium electroplating solution at least includes the following components: trivalent water-soluble chromium salt: 15 parts by weight; cobalt salt: 12 parts by weight; conductive salt: 20 parts by weight; complexing agent: 4 parts by weight; buffer : 7 parts by weight; blackening agent: 0.5 parts by weight; brightener: 0.01 parts by weight; deionized water: 100 parts by weight.

[0091] The trivalent water-soluble chromium salt is chromium sulfate; the cobalt salt is cobalt sulfate;...

Embodiment 2

[0100] Embodiment 2 provides a preparation method of a trivalent chromium coating, which at least includes the following steps: immersing the substrate in a trivalent chromium electroplating solution, electroplating with the substrate as a cathode, the electroplating temperature is 20°C, and the current density 6A / dm 2 , the electroplating time is 5min; the trivalent chromium coating is plated on the substrate; the surface of the substrate contains at least one conductive layer;

[0101] The trivalent chromium electroplating solution at least includes the following components: trivalent water-soluble chromium salt: 20 parts by weight; cobalt salt: 16 parts by weight; conductive salt: 35 parts by weight; complexing agent: 6 parts by weight; : 10 parts by weight; blackening agent: 1.6 parts by weight; brightener: 0.5 parts by weight; deionized water: 100 parts by weight.

[0102] The trivalent water-soluble chromium salt is chromium sulfate; the cobalt salt is cobalt sulfate; t...

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
diameteraaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

The invention relates to the field of trivalent chromium electroplating, in particular to a trivalent chromium coating and a preparation method thereof. The preparation method of the trivalent chromium coating at least comprises the following steps that a substrate is dipped in a trivalent chromium electroplating bath, electroplating is conducted with the substrate as the cathode, the electroplating temperature is 20-45 DEG C, the current density is 6 A / dm<2> to 25 A / dm<2>, and the electroplating time is 5-30 min; the substrate is coated with the trivalent chromium coating in a plated mode; the surface of the substrate at least comprises a conducting layer; and the trivalent chromium electroplating bath at least comprises the following components of, by weight, 15-20 parts of water-soluble chromic salt, 12-16 parts of cobalt salt, 20-35 parts of conducting salt, 4-6 parts of a coordination agent, 7-10 parts of a buffering agent, 0.5-1.6 parts of a blackening agent, 0.01-0.5 part of a brightener and 100 parts of deionized water.

Description

technical field [0001] The invention relates to the field of trivalent chromium electroplating, in particular to a trivalent chromium coating and a preparation method thereof. Background technique [0002] Black chrome coating is a special coating among functional chrome coatings. Because of its good physical and chemical properties, solemn and magnificent appearance, and good wear resistance, corrosion resistance and temperature resistance, it is widely used. The main components of the black chromium coating are metal chromium and chromium oxide. The chromium oxide particles are dispersed in the metal chromium medium. Due to the interband transition of metal chromium and the resonance of the chromium oxide particles, the black chromium coating has a strong absorption effect on solar radiation. Black chrome plating is often used on parts such as cameras, optical instruments, military weapons, and instrumentation systems to prevent diffuse reflection of light; in order to ach...

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 Patents(China)
IPC IPC(8): C25D3/56
CPCC25D3/56
Inventor 张志恒
Owner WINSTAR CHEM SHANGHAI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com