Compound chromium plating additive

An additive and lightweight technology, applied in the field of composite chrome plating additives, can solve problems such as difficult control of process parameters, corrosion, dark gray appearance, etc.

Inactive Publication Date: 2012-07-11
闫瑞景
View PDF2 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the chromium plating process, the first catalyst is fluorine ion or fluosilicic acid, etc., with high current efficiency and fine and bright coating, but it will corrode the anode and the coating substrate, so the accumulation of impurities in the solution is fast, the process is difficult to control, and the plating tank is easy to age. scrapped
Alkanesulphonic acid or its salts were first used in the chromium plating process by Politecnico in Milan. The coating is bright and crystallized, but the corrosion anode and bright range are narrow, and the depth capability is not good. The Hall cell test piece is 9cm, especially used Paraffin sulfonate, the anti-corrosion ability of the coating is reduced
The rare earth additives disclosed in Chinese patents CN89105414.6 and CN87102034 are all low-temperature and low-concentration chromium plating processes, but it is difficult to control process parameters when they are changed to standard electroplating solutions
[0003] With iodine and other halogens as additives, the current efficiency is improved, because the iodine releasing agent has an activation effect on the coating substrate, but the coating bonding force is poor in the high current area, the appearance is dark gray, semi-bright, and the brightness range is narrow

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

[0017] Composite chrome-plating additives, including organic matter and inorganic matter, said organic matter adopts: Dimethanesulfonic acid, 5g / L standard chrome-plating solution; Sulfamic acid, 1g / L standard chrome-plating solution;

[0018] Inorganic substances used: lanthanum fluoride, 0.06g / L standard chrome plating solution; arsenic oxide, 0.1g / L standard chrome plating solution;

[0019] The standard chromium plating bath contains 150 g / L chromic anhydride and 1.5 g / L sulfuric acid, the working temperature is 30°C, and the current density is 15A / dm 2 . The current efficiency is 25%, the coating is bright and meticulous, and the right angle experiment is all up. The hardness of the coating is high, and the Vickers hardness is 900HV.

Embodiment 2

[0021] Composite chrome-plating additives, including organic matter and inorganic matter, said organic matter adopts: dioxane sulfonic acid, 4g / L standard chrome-plating solution; glycine, 2g / L standard chrome-plating solution;

[0022] Inorganic substances are used: cerium fluoride, 0.04g / L standard chromium plating solution; bismuth oxide, 0.05g / L standard chromium plating solution; the standard chromium plating solution contains 400 g / L chromic anhydride and 4 g / L sulfuric acid, and the working temperature is 75 ℃, current density 50A / dm 2 . The current efficiency is 29%, the coating is bright and meticulous, and the right angle test is all up. The hardness of the coating is high, the Vickers hardness is 1380HV.

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
Vickers hardnessaaaaaaaaaa
Vickers hardnessaaaaaaaaaa
current efficiencyaaaaaaaaaa
Login to view more

Abstract

The invention discloses a compound chromium plating additive, comprising organic matter and inorganic matter, wherein the organic matter comprises 1-20 g of alkansulfonic acid and/or alkanoic disulfonic acid in 1L of a standard chromium plating liquid or 0.01-0.1 g of nitrogen-containing organic compound in 1L of the standard chromium plating liquid, the inorganic matter comprises 0.001-0.01 g of a light rare earth fluoride in1L of the standard chromium plating liquid and/or 0.01-0.1 g of one of VA family element oxide, hydroxide or sulfate/ According to the invention, the organic matter and the inorganic matter are added in the standard chromium plating liquid, thus the current efficiency is high , the coating has good brightness, the technology bright range is wide, the deep plating capability is good, the coating has high hardness, the anode has no corrosion, the technology is simple, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of chrome plating, in particular to a composite chrome plating additive. Background technique [0002] In the chromium plating process, the first catalyst is fluorine ion or fluosilicic acid, etc., with high current efficiency and fine and bright coating, but it will corrode the anode and the coating substrate, so the accumulation of impurities in the solution is fast, the process is difficult to control, and the plating tank is easy to age. scrapped. Alkanesulphonic acid or its salts were first used in the chromium plating process by Politecnico in Milan. The coating is bright and crystallized, but the corrosion anode and bright range are narrow, and the depth capability is not good. The Hall cell test piece is 9cm, especially used Paraffin sulfonate, the anti-corrosion ability of the coating is reduced. The rare earth additives disclosed in Chinese patents CN89105414.6 and CN87102034 are all low-temperat...

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): C25D3/04
Inventor 闫瑞景贾雅博牛新宇梁镇海赵鑫闫景芳
Owner 闫瑞景
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap