CN110907258A - Gold metallographic electrolytic corrosion method - Google Patents
Gold metallographic electrolytic corrosion method Download PDFInfo
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- CN110907258A CN110907258A CN201911393243.5A CN201911393243A CN110907258A CN 110907258 A CN110907258 A CN 110907258A CN 201911393243 A CN201911393243 A CN 201911393243A CN 110907258 A CN110907258 A CN 110907258A
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- electrolytic corrosion
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/32—Polishing; Etching
Abstract
The invention belongs to the technical field of metal surface treatment, and relates to a gold metallographic electrolytic corrosion method, which comprises the steps of preparing 30 wt% of hydrogen peroxide and 37 wt% of hydrochloric acid into electrolytic corrosion liquid according to the volume ratio of 1:2, and uniformly stirring; pouring the prepared electrolytic corrosion solution into an electrolytic corrosion instrument, wherein the anode material of the electrolytic corrosion instrument adopts a polished gold sample, and is subjected to electrolytic corrosion at normal temperature, the electrolytic voltage adopts 8-10V direct current voltage, and the corrosion time is 3-8 s; and taking the gold sample out of the electrolytic corrosion instrument after the electrolytic corrosion, and washing and drying the surface. The method has the advantages of easily controlled reaction conditions, capability of quickly obtaining clear metallographic pictures and convenience in evaluating the quality of gold products.
Description
Technical Field
The invention relates to the technical field of metal surface treatment, in particular to a gold metallographic electrolytic corrosion method.
Background
As the king of hardware, gold is a rare metal with excellent chemical, physical and electronic properties, and has wide application fields, such as electronics, communication, aerospace, chemical engineering, medical treatment and the like. The main characteristics are as follows: high corrosion resistance, good electric conductivity, thermal conductivity, toughness and ductility.
With the application of gold target materials in high-end science and technology industries, the requirements on products are higher and higher. In the production process of the gold target, different types of metallographic structures are often obtained through the difference of material components and the difference of the processing heat treatment process, so that the performances of the target are different. Generally, the gold target material metallographic corrosion is that electrolytic corrosive liquid is used as corrosive agent, and the gold target material is directly soaked for corrosion after being heated. In the gold metallographic etching method, the etching agent needs to be heated to improve the etching rate, but the electrolytic etching solution is volatile, and the concentration ratio changes in the heating process, so that the etching effect is influenced. As shown in FIG. 1, the grain boundaries of the structure corroded by the method are fuzzy and difficult to identify, and the observation and identification of the metallographic structure are adversely affected.
In view of the above-mentioned drawbacks of the prior metallographic etching method for gold samples, it is necessary to provide a new technique to solve the above problems.
Disclosure of Invention
The invention mainly aims to provide a gold metallographic electrolytic corrosion method, which can quickly obtain a clear metallographic picture and is convenient for evaluating the quality of a gold product.
The invention realizes the purpose through the following technical scheme: a gold metallographic electrolytic corrosion method comprises the steps of preparing 30 wt% of hydrogen peroxide and 37 wt% of hydrochloric acid into electrolytic corrosion liquid according to the volume ratio of 1:2, and uniformly stirring; pouring the prepared electrolytic corrosion solution into an electrolytic corrosion instrument, wherein the anode material of the electrolytic corrosion instrument adopts a polished gold sample, and is subjected to electrolytic corrosion at normal temperature, the electrolytic voltage adopts 8-10V direct current voltage, and the corrosion time is 3-8 s; and taking the gold sample out of the electrolytic corrosion instrument after the electrolytic corrosion, and washing and drying the surface.
Specifically, the cathode material of the electrolytic corrosion meter is 304 stainless steel.
Specifically, the surface of the gold sample is washed by distilled water for more than 1 min.
Specifically, the drying of the gold sample is firstly wiped by a cotton ball with alcohol, and then the surface water is treated by an air gun.
By adopting the technical scheme, the technical scheme of the invention has the beneficial effects that:
the method has the advantages of easily controlled reaction conditions, capability of quickly obtaining clear metallographic pictures and convenience in evaluating the quality of gold products.
Drawings
FIG. 1 is a microscopic picture of gold metallographic phase corroded by common electrolytic corrosive liquid;
FIG. 2 is a micrograph of gold phase after treatment in example 1;
FIG. 3 is a micrograph of gold phase after treatment in example 2.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1:
preparing 10ml of 30 wt% hydrogen peroxide and 20ml of 37 wt% hydrochloric acid into electrolytic corrosion liquid in a container, and uniformly stirring; pouring the prepared electrolytic corrosion solution into an electrolytic corrosion instrument, wherein the anode material of the electrolytic corrosion instrument adopts a polished gold sample, and is subjected to electrolytic corrosion at normal temperature, the electrolytic voltage adopts 8V direct current voltage, and the corrosion time is 8 s; and taking the gold sample out of the electrolytic corrosion instrument after the electrolytic corrosion, and washing and drying the surface. The cathode material of the electrolytic corrosion instrument is 304 stainless steel, the material has good conductivity, and gold can be fully subjected to surface electrocorrosion in a short time. Washing with distilled water to wash the surface of gold sample for more than 1 min. Drying the gold sample, firstly wiping the gold sample by using a cotton ball with alcohol, and then cleaning the surface water by using an air gun. So that the gold surface does not have obvious residues to influence the observation. The microscopic metallographic phase of the gold sample obtained is shown in FIG. 2.
Example 2:
preparing 10ml of 30 wt% hydrogen peroxide and 20ml of 37 wt% hydrochloric acid into electrolytic corrosion liquid in a container, and uniformly stirring; pouring the prepared electrolytic corrosion solution into an electrolytic corrosion instrument, wherein the anode material of the electrolytic corrosion instrument adopts a polished gold sample, and is subjected to electrolytic corrosion at normal temperature, the electrolytic voltage adopts direct current voltage of 10V, and the corrosion time is 3 s; and taking the gold sample out of the electrolytic corrosion instrument after the electrolytic corrosion, and washing and drying the surface. The cathode material of the electrolytic corrosion instrument adopts 304 stainless steel. Washing with distilled water to wash the surface of gold sample for more than 1 min. Drying the gold sample, firstly wiping the gold sample by using a cotton ball with alcohol, and then cleaning the surface water by using an air gun. The microscopic metallographic phase of the gold sample obtained is shown in FIG. 3.
As shown in the metallographic pictures of fig. 2 and 3, compared with the prior art (fig. 1), the metallographic phase is clear, the treatment time is only a few seconds, the reaction conditions are easy to control, and the quality of the gold product can be conveniently evaluated.
What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (4)
1. The electrolytic corrosion method for gold metallographic phase is characterized by comprising the following steps: preparing electrolytic corrosion liquid by using one volume of hydrogen peroxide and three volumes of concentrated hydrochloric acid, and uniformly stirring; pouring the prepared electrolytic corrosion solution into an electrolytic corrosion instrument, wherein the anode material of the electrolytic corrosion instrument adopts a polished gold sample, and is subjected to electrolytic corrosion at normal temperature, the electrolytic voltage adopts 8-10V direct current voltage, and the corrosion time is 3-8 s; and taking the gold sample out of the electrolytic corrosion instrument after the electrolytic corrosion, and washing and drying the surface.
2. The electrolytic corrosion method for gold metallographic phase according to claim 1, characterized in that: the cathode material of the electrolytic corrosion instrument adopts 304 stainless steel.
3. The electrolytic corrosion method for gold metallographic phase according to claim 1, characterized in that: washing with distilled water to wash the surface of gold sample for more than 1 min.
4. The electrolytic corrosion method for gold metallographic phase according to claim 1, characterized in that: drying the gold sample, firstly wiping the gold sample by using a cotton ball with alcohol, and then cleaning the surface water by using an air gun.
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| CN201911393243.5A CN110907258A (en) | 2019-12-30 | 2019-12-30 | Gold metallographic electrolytic corrosion method |
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| CN201911393243.5A CN110907258A (en) | 2019-12-30 | 2019-12-30 | Gold metallographic electrolytic corrosion method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113740140A (en) * | 2021-07-30 | 2021-12-03 | 淮浙电力有限责任公司凤台发电分公司 | Method for acquiring failure risk level of ferrite steel welded joint for thermal power plant |
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| CH589850A5 (en) * | 1974-07-12 | 1977-07-15 | Kernforschung Gmbh Ges Fuer | |
| ES2343298A1 (en) * | 2009-01-26 | 2010-07-27 | Metal Finishing Development, S.L. | Means, process and device for superficial treatment of surfaces of parts of gold or alloys thereof |
| CN103820843A (en) * | 2012-11-16 | 2014-05-28 | 有研亿金新材料股份有限公司 | Electrolytic polishing solution for high-purity silver metallographic sample and use method of electrolytic polishing solution |
| CN104451851A (en) * | 2014-12-02 | 2015-03-25 | 河北钢铁股份有限公司 | Electrolytic corrosion agent capable of displaying nickel-based corrosion-resistant alloy metallographic structure and corrosion method thereof |
| CN105256315A (en) * | 2015-09-16 | 2016-01-20 | 昆山全亚冠环保科技有限公司 | Metallographic corrosive agent and method for nickel-vanadium alloy |
| CN106757299A (en) * | 2016-12-15 | 2017-05-31 | 上海电气核电设备有限公司 | The electrobrightening corrosive agent and its application method of a kind of nickel-base alloy metallographic structure |
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2019
- 2019-12-30 CN CN201911393243.5A patent/CN110907258A/en active Pending
Patent Citations (7)
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|---|---|---|---|---|
| GB723945A (en) * | 1951-09-20 | 1955-02-16 | Degussa | An electrolytic process for smoothing and polishing surfaces of gold and gold alloys |
| CH589850A5 (en) * | 1974-07-12 | 1977-07-15 | Kernforschung Gmbh Ges Fuer | |
| ES2343298A1 (en) * | 2009-01-26 | 2010-07-27 | Metal Finishing Development, S.L. | Means, process and device for superficial treatment of surfaces of parts of gold or alloys thereof |
| CN103820843A (en) * | 2012-11-16 | 2014-05-28 | 有研亿金新材料股份有限公司 | Electrolytic polishing solution for high-purity silver metallographic sample and use method of electrolytic polishing solution |
| CN104451851A (en) * | 2014-12-02 | 2015-03-25 | 河北钢铁股份有限公司 | Electrolytic corrosion agent capable of displaying nickel-based corrosion-resistant alloy metallographic structure and corrosion method thereof |
| CN105256315A (en) * | 2015-09-16 | 2016-01-20 | 昆山全亚冠环保科技有限公司 | Metallographic corrosive agent and method for nickel-vanadium alloy |
| CN106757299A (en) * | 2016-12-15 | 2017-05-31 | 上海电气核电设备有限公司 | The electrobrightening corrosive agent and its application method of a kind of nickel-base alloy metallographic structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113740140A (en) * | 2021-07-30 | 2021-12-03 | 淮浙电力有限责任公司凤台发电分公司 | Method for acquiring failure risk level of ferrite steel welded joint for thermal power plant |
| CN113740140B (en) * | 2021-07-30 | 2024-03-22 | 淮浙电力有限责任公司凤台发电分公司 | Failure risk grade acquisition method for ferritic steel welded joint for thermal power plant |
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Application publication date: 20200324 |