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

Trivalent chromium plating solution and electroplating method

A technology of trivalent chromium and electroplating solution, applied in the field of electroplating, can solve problems such as unreported application of chromium electroplating

Inactive Publication Date: 2009-03-18
KUNMING UNIV OF SCI & TECH
View PDF0 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the above-mentioned characteristics of ionic liquids, it has incomparable advantages in electroplating active metals with aqueous solutions. In recent years, it has been widely used in the electroplating of various active metals such as aluminum, zinc and other metals, but the application of chromium electroplating has not been reported.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Will C 5 h 14 After mixing ClNO and chromium trichloride hexahydrate at a mass ratio of 1:3, put them in a sealed container, heat up to 60°C and keep warm until the two solids are completely dissolved into a mixed solution, and then control the temperature of the mixed solution to be 40°C; The cathode is polished with 240-mesh coarse sandpaper, polished with W20 metallographic sandpaper after rinsing, polished with a polishing machine after rinsing, and then soaked in a mixed solution containing 40g / L of sodium hydroxide and 60g / L of sodium carbonate for 3 minutes, and then put the cathode Rinse and dry at 75°C for half an hour, then immerse the cathode in a plating solution at a temperature of 40°C, and control the cathode current density to 1mA / cm 2 After 2 hours of electroplating, the cathode was taken out, rinsed with distilled water, dried, and then measured by weighing method. The thickness of the cathode coating was 0.92 μm, and the current efficiency was 51%. ...

Embodiment 2

[0020] Will C 5 h 14 After mixing ClNO and chromium trichloride hexahydrate at a mass ratio of 1:4, put them in a sealed container, heat up to 80°C and keep warm until the two solids are all dissolved into a mixed solution, and then control the temperature of the mixed solution to be 50°C; The cathode is polished with 240 mesh coarse sandpaper, polished with W20 metallographic sandpaper after rinsing, polished with a polishing machine after rinsing, and then soaked in a mixed solution containing 40g / L sodium hydroxide and 60g / L sodium carbonate for 3 minutes, and then rinsed clean And dry at 75°C for half an hour, immerse the cathode in the plating solution with a temperature of 50°C, and control the cathode current density to 1mA / cm 2 After electroplating for 1 hour, the cathode was taken out, rinsed with distilled water, dried, and then measured by weighing method. The thickness of the cathode coating was 0.77 μm, and the current efficiency was 84.44%.

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
Login to View More

Abstract

The invention provides trivalent chromium plating solution and a plating method. The plating solution consists of compositions according to the following mass ratio: the ratio of C5H14ClNO to chromium (III) chloride hexahydrate equals to between 1 to 0.95 and 5.73. The method comprises the following steps: cathode which is subjected to grinding, polishing, soaking, cleaning and drying is inserted into plating solution with the temperature of between 40 and 80 DEG C; applying current with current density of between 0.0005 and 0.005 ampere / centimeter<2> to the plating solution; plating the cathode for 1 to 8 hours; taking out the cathode, and removing the plating solution by cleaning solution to obtain the trivalent chromium plated product. The plating solution uses the C5H14ClNO and the chromium(III) chloride hexahydrate as raw materials, has the advantages of low toxicity, environmental protection, good thermal and chemical stability, high conductivity, simple synthesis, convenient use, reduction of hydrogen evolution compared with the prior aqueous solution chromium plating, and the improvement on current efficiency.

Description

technical field [0001] The invention relates to a trivalent chromium electroplating solution and an electroplating method, belonging to the technical field of electroplating. Background technique [0002] Chromium is a metal with high hardness, small friction coefficient, excellent wear resistance and heat resistance, so chromium is widely used in industry. Chromium electrodeposited coating has the advantages of brightness, high hardness, excellent corrosion resistance and wear resistance, and strong decorative ability. Therefore, electroplating chromium has always been one of the main plating types in the modern electroplating industry. Chromium coatings can be divided into decorative coatings and functional coatings, including hard chrome, milky white chrome, loose-hole chrome, black chrome, etc. Traditional chromium electroplating mainly includes hexavalent chromium electroplating and trivalent chromium electroplating, among which hexavalent chromium electroplating is li...

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
IPC IPC(8): C25D3/06
Inventor 华一新崔焱
Owner KUNMING UNIV OF SCI & TECH
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