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

Method for removing red spots on surface of pure gold product

A technology for products and erythema, applied in the field of removing erythema on the surface of pure gold products, can solve problems such as affecting the appearance and surface pitting of pure gold products, and achieve the effects of short time consumption, easy cleaning and simple process.

Inactive Publication Date: 2017-12-15
江苏盐城环保科技城重金属防治研究中心
View PDF6 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In addition, some of the skin care products and cosmetics that people use today contain trace amounts of mercury, so when people wear pure gold jewelry, they will inevitably stain the surface of the gold with these pollutants, and mercury and gold can form an "amalgam". "Thereby causing pitting corrosion to form spots on the surface of pure gold products
[0004] At present, there is no established treatment method for erythema on the surface of pure gold, and most of them adopt the following methods to repair: Wiping method, that is, wipe the surface of pure gold with toothpaste or similar abrasives, although it can be removed, but small scratches will be left on the surface , affect the appearance, and for the processing of complex and irregular ornaments, this method is powerless; the burning method, that is, burning the spots with a high-temperature gun, although it can also be removed, it will still leave traces. Highly demanding pure gold products (such as the mirror surface of gold coins) are not suitable

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
  • Method for removing red spots on surface of pure gold product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Weigh 140 grams of analytically pure thiourea into a beaker, add 1000 mL of deionized water, heat and stir to completely dissolve the thiourea;

[0026] 2. Take it off, cool it to room temperature, and filter out the insoluble matter with qualitative filter paper;

[0027] 3. Add 10 mL of analytically pure nitric acid to the thiourea solution and stir evenly;

[0028] 4. Heat the above solution to 50°C, immerse in a pure gold ring with erythema, and shake it gently for 60 seconds;

[0029] 5. Take out the ring, clean it with deionized water, wipe the surface dry with a clean soft cotton cloth, and then use a hair dryer to blow the surface with cool wind for 1 minute.

Embodiment 2

[0031] 1. Weigh 120 grams of analytically pure thiourea into a beaker, add 1000 mL of deionized water, heat and stir to completely dissolve the thiourea;

[0032] 2. Take it off, cool it to room temperature, and filter out the insoluble matter with qualitative filter paper;

[0033] 3. Add 8 mL of analytically pure nitric acid to the thiourea solution, and stir evenly;

[0034] 4. Heat the above solution to 40°C, immerse in a pure gold ring with erythema, and shake it gently for 80 seconds;

[0035] 5. Take out the ring, clean it with deionized water, wipe the surface dry with a clean soft cotton cloth, and then use a hair dryer to blow the surface with cool wind for 2 minutes.

Embodiment 3

[0037] 1. Weigh 100 grams of analytically pure thiourea and place it in a beaker, add 1000 mL of deionized water, heat and stir to completely dissolve the thiourea;

[0038] 2. Take it off, cool it to room temperature, and filter out the insoluble matter with qualitative filter paper;

[0039] 3. Add 12mL of analytically pure nitric acid to the thiourea solution and stir evenly;

[0040] 4. Heat the above solution to 40°C, immerse in a pure gold necklace with erythema, and shake gently for 210s;

[0041] 5. Take out the pure gold necklace, clean it with deionized water, wipe the surface dry with a clean soft cotton cloth, and then use a hair dryer to blow the surface with cool wind for 5 minutes.

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

No PUM Login to View More

Abstract

The invention provides a method for removing red spots on the surface of a pure gold product. The method especially aims at recovery of the color changing part of the surface of the pure gold craft, mainly removal of red spots. The method comprises the steps that firstly, a washing solution is prepared, then the pure gold product with the color changed is put into the washing solution till the red spots disappear, and then the pure gold product is taken out, washed with deionized water and dried. The method has the advantages that the process is simple, the time for removing the red spots on the surface is short, and the surface of the pure gold product has no physical damage; and medium acid is nitric acid, the pure gold is not damaged, and the washing solution is recyclable and easy to wash away after the red spots are removed.

Description

technical field [0001] The invention belongs to metal surface treatment, in particular to a method for removing erythema on the surface of pure gold products. Background technique [0002] The chemical properties of gold are extremely stable, and it does not react with any oxides under non-extreme conditions. However, in recent years, reports of "rusting" on the surface of pure gold products, especially jewelry, are often reported in various media, which is caused by today's gold and silver processing technology itself. In the process of gold and silver processing, due to the high-speed operation of various mechanical processing tools such as lathes, planers, milling, etc., there are tiny particles of gold and silver in the dust on the processing site (not visible to the naked eye), and some enterprises process The gold and silver of the equipment are not separated, which also causes the phenomenon of "gold sticking to silver". As long as silver particles are attached to t...

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): C23G1/10
CPCC23G1/10
Inventor 王德雨张正洁陈扬佟永顺
Owner 江苏盐城环保科技城重金属防治研究中心
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