CN111519193A - Pickling agent for producing electronic product shell and preparation method thereof - Google Patents
Pickling agent for producing electronic product shell and preparation method thereof Download PDFInfo
- Publication number
- CN111519193A CN111519193A CN202010495214.6A CN202010495214A CN111519193A CN 111519193 A CN111519193 A CN 111519193A CN 202010495214 A CN202010495214 A CN 202010495214A CN 111519193 A CN111519193 A CN 111519193A
- Authority
- CN
- China
- Prior art keywords
- acid
- cleaning agent
- electronic product
- pickling agent
- antioxidant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a pickling agent for producing electronic product shells and a preparation method thereof, belongs to the technical field of electronic product production and processing, and relates to a pickling agent for producing electronic product shells and a preparation method thereof, wherein the pickling agent comprises the following components in percentage by mass: the pickling agent has a simple formula, takes the acid solution, the anionic surfactant and the deionized water as main cleaning components, and utilizes the chemical reaction of the acid solution and rust on the surface of the metal to clean the surface of the metal shell. After the pickling agent is used, a proper amount of alkali can be added to neutralize the pickling agent to be neutral, and then the pickling agent is directly discharged to a sewer, so that the hazards of biological enrichment, COD (chemical oxygen demand) improvement and the like are avoided, the pickling agent is environment-friendly, independent treatment is not needed, and the use cost of an enterprise is reduced.
Description
Technical Field
The invention relates to the technical field of electronic product production and processing, in particular to a pickling agent for electronic product shell production and a preparation method thereof.
Background
The electronic product is a related product based on electric energy, and mainly comprises: watches, smart phones, telephones, televisions, video disc players, video recorders, camcorders, radios, radio recorders, combination speakers, compact disc players, computers, game consoles, mobile communication products, and the like, since early products were primarily electronic products based on electronic tubes.
The metal shell is often needed in the processing process of electronic products, and the surface of the metal shell is often needed to be cleaned by using a pickling agent in the processing process of the metal shell. In recent years, with the rapid development of national economy, chemical cleaning technology has been greatly developed, and the development has been progressed from a single cleaning agent of hydrochloric acid and corrosion inhibitor to the adoption of a plurality of different cleaning agents such as hydrofluoric acid, EDTA and the like aiming at scales, corrosion products and the like of different materials, but each cleaning agent in the prior art has the defects and limitations, such as equipment corrosion caused by hydrochloric acid as the cleaning agent and environmental pollution caused by hydrofluoric acid as the cleaning agent, and high cost caused by EDTA as the cleaning agent. Therefore, how to select a reasonable acid as the pickling agent is an important issue in the field of metal cleaning.
Disclosure of Invention
1. Technical problem to be solved
The invention aims to provide a pickling agent for producing electronic product shells and a preparation method thereof, aiming at solving the problems in the prior art.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
A pickling agent for producing electronic product shells comprises the following components in percentage by mass: 30-40% of acid liquor, 4-7% of sodium bicarbonate, 5-8% of anionic surfactant, 0.5-1% of coagulant, 3-6% of dirt adsorbent, 2-4% of oxidation and corrosion inhibitor and the balance of deionized water.
Further, the paint comprises the following components in percentage by mass: 35% of acid liquor, 5% of sodium bicarbonate, 6.5% of anionic surfactant, 0.75% of coagulant, 4.5% of dirt adsorbent, 3% of antioxidant and corrosion inhibitor and 45.25% of deionized water.
Further, the acid solution is a mixture of organic acid and inorganic acid, and the mass ratio of the organic acid to the inorganic acid is 5-8: 1-2.
Further, the organic acid is one or a mixture of more than two of citric acid, malic acid, tartaric acid, acetic acid, oleic acid, linoleic acid, succinic acid and oxalic acid.
Further, the inorganic acid is one or a mixture of more than two of hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid and hydrofluoric acid.
Further, the anionic surfactant is one or a mixture of more than two of sodium dodecyl benzene sulfonate, sodium hexadecylbenzene sulfonate, sodium alkyl sulfate, sodium alkyl polyoxyethylene ether sulfate, sodium fatty alcohol polyoxyethylene ether sulfate, sodium alkyl polyoxyethylene ether carboxylate, sodium alkyl sulfonate and sodium oleoyl methyl taurate.
Further, the soil adsorbent is carboxymethyl cellulose.
Further, the antioxidant and corrosion inhibitor is a mixture of an amine antioxidant and a phenol antioxidant, wherein the mass ratio of the amine antioxidant to the phenol antioxidant is 1: 3-5, the amine antioxidant is diphenylamine, and the phenol antioxidant is 2, 6-di-tert-butyl-p-cresol.
Further, the coagulant is one or a mixture of more than two of polyaluminium chloride, polyaluminium sulfate, polyferric chloride and polyferric sulfate.
A preparation method of a pickling agent for producing electronic product shells comprises the following steps:
s1, preparing acid liquor, sodium bicarbonate, an anionic surfactant, a coagulant, a dirt adsorbent, an antioxidant and corrosion inhibitor and deionized water according to the mass percentage;
s2, putting the deionized water and the acid liquor into a corrosion-resistant stirring tank, and fully stirring, mixing and uniformly mixing to obtain a mixed liquor A;
s3, adding sodium bicarbonate and an anionic surfactant into the mixed solution A, heating to 50-60 ℃, and fully and uniformly stirring to obtain a mixed solution B;
s4, adding a coagulant, a dirt adsorbent and an oxidation and corrosion inhibitor into the mixed solution B, keeping the temperature at 50-60 ℃, fully and uniformly stirring, standing and cooling to obtain the pickling agent.
3. Advantageous effects
(1) The pickling agent disclosed by the invention is simple in formula, takes acid liquor, an anionic surfactant and deionized water as main cleaning components, and realizes the cleaning of the surface of the metal shell by utilizing the chemical reaction of the acid liquor and rust on the surface of the metal.
(2) The sodium bicarbonate is added in the pickling agent, and the sodium bicarbonate has a certain cleaning effect, so that the cleaning effect of the pickling agent is effectively improved.
(3) In the invention, the coagulant is added, so that in the process of acid cleaning, positively charged groups and negatively charged particles or particles which are difficult to separate in water can be close to each other by the coagulant, the potential of the particles is reduced to enable the particles to be in an unstable state, and the particles are concentrated to form precipitates by utilizing the polymerization property of the particles, thereby effectively improving the cleaning efficiency.
(4) After the pickling agent is used, a proper amount of alkali can be added to neutralize the pickling agent to be neutral, and then the pickling agent is directly discharged to a sewer, so that the hazards of biological enrichment, COD (chemical oxygen demand) improvement and the like are avoided, the pickling agent is environment-friendly, independent treatment is not needed, and the use cost of an enterprise is reduced.
Drawings
FIG. 1 is a flow chart of the preparation method of the present invention.
Detailed Description
The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.
Example 1:
a pickling agent for producing electronic product shells comprises the following components in percentage by mass: 30% of acid liquor, 4% of sodium bicarbonate, 5% of anionic surfactant, 0.5% of coagulant, 3% of dirt adsorbent, 2% of oxidation and corrosion inhibitor and 55.5% of deionized water.
The acid solution is a mixture of organic acid and inorganic acid, and the mass ratio of the organic acid to the inorganic acid is 5: 1.
the organic acid is a mixture of citric acid and malic acid, the inorganic acid is hydrochloric acid, the anionic surfactant is sodium dodecyl benzene sulfonate, the dirt adsorbent is carboxymethyl cellulose, and the coagulant is polyaluminium chloride.
The antioxidant corrosion inhibitor is a mixture of an amine antioxidant and a phenol antioxidant, wherein the mass ratio of the amine antioxidant to the phenol antioxidant is 1: 3, the amine antioxidant is diphenylamine, and the phenol antioxidant is 2, 6-di-tert-butyl-p-cresol.
A preparation method of a pickling agent for producing electronic product shells comprises the following steps:
s1, preparing acid liquor, sodium bicarbonate, an anionic surfactant, a coagulant, a dirt adsorbent, an antioxidant and corrosion inhibitor and deionized water according to the mass percentage;
s2, putting the deionized water and the acid liquor into a corrosion-resistant stirring tank, and fully stirring, mixing and uniformly mixing to obtain a mixed liquor A;
s3, adding sodium bicarbonate and an anionic surfactant into the mixed solution A, heating to 50 ℃, and fully and uniformly stirring to obtain a mixed solution B;
s4, adding a coagulant, a dirt adsorbent and an oxidation and corrosion inhibitor into the mixed solution B, keeping the temperature at 50 ℃, fully and uniformly stirring, standing and cooling to obtain the pickling agent.
Example 2
A pickling agent for producing electronic product shells comprises the following components in percentage by mass: 35% of acid liquor, 5% of sodium bicarbonate, 6.5% of anionic surfactant, 0.75% of coagulant, 4.5% of dirt adsorbent, 3% of antioxidant and corrosion inhibitor and 45.25% of deionized water.
The acid solution is a mixture of organic acid and inorganic acid, and the mass ratio of the organic acid to the inorganic acid is 6.5: 1.
the organic acid is a mixture of citric acid, malic acid, tartaric acid and acetic acid, the inorganic acid is a mixture of hydrochloric acid and sulfuric acid, the anionic surfactant is a mixture of sodium dodecyl benzene sulfonate and sodium hexadecyl benzene sulfonate, the dirt adsorbent is carboxymethyl cellulose, and the coagulant is polyaluminium sulfate.
The antioxidant corrosion inhibitor is a mixture of an amine antioxidant and a phenol antioxidant, wherein the mass ratio of the amine antioxidant to the phenol antioxidant is 1: 4, the amine antioxidant is diphenylamine, and the phenol antioxidant is 2, 6-di-tert-butyl-p-cresol.
A preparation method of a pickling agent for producing electronic product shells comprises the following steps:
s1, preparing acid liquor, sodium bicarbonate, an anionic surfactant, a coagulant, a dirt adsorbent, an antioxidant and corrosion inhibitor and deionized water according to the mass percentage;
s2, putting the deionized water and the acid liquor into a corrosion-resistant stirring tank, and fully stirring, mixing and uniformly mixing to obtain a mixed liquor A;
s3, adding sodium bicarbonate and an anionic surfactant into the mixed solution A, heating to 55 ℃, and fully and uniformly stirring to obtain a mixed solution B;
s4, adding a coagulant, a dirt adsorbent and an oxidation and corrosion inhibitor into the mixed solution B, keeping the temperature at 55 ℃, fully and uniformly stirring, standing and cooling to obtain the pickling agent.
Example 3
A pickling agent for producing electronic product shells comprises the following components in percentage by mass: 40% of acid liquor, 7% of sodium bicarbonate, 8% of anionic surfactant, 1% of coagulant, 6% of dirt adsorbent, 4% of oxidation and corrosion inhibitor and 34% of deionized water.
The acid solution is a mixture of organic acid and inorganic acid, and the mass ratio of the organic acid to the inorganic acid is 8: 1.5.
the organic acid is a mixture of citric acid and malic acid, the inorganic acid is hydrochloric acid, the anionic surfactant is a mixture of sodium alkyl sulfate and sodium alkyl polyoxyethylene ether sulfate, the dirt adsorbent is carboxymethyl cellulose, and the coagulant is a mixture of polyferric chloride and polyferric sulfate.
The antioxidant corrosion inhibitor is a mixture of an amine antioxidant and a phenol antioxidant, wherein the mass ratio of the amine antioxidant to the phenol antioxidant is 1: 5, the amine antioxidant is diphenylamine, and the phenol antioxidant is 2, 6-di-tert-butyl-p-cresol.
A preparation method of a pickling agent for producing electronic product shells comprises the following steps:
s1, preparing acid liquor, sodium bicarbonate, an anionic surfactant, a coagulant, a dirt adsorbent, an antioxidant and corrosion inhibitor and deionized water according to the mass percentage;
s2, putting the deionized water and the acid liquor into a corrosion-resistant stirring tank, and fully stirring, mixing and uniformly mixing to obtain a mixed liquor A;
s3, adding sodium bicarbonate and an anionic surfactant into the mixed solution A, heating to 60 ℃, and fully and uniformly stirring to obtain a mixed solution B;
s4, adding a coagulant, a dirt adsorbent and an oxidation and corrosion inhibitor into the mixed solution B, keeping the temperature at 60 ℃, fully and uniformly stirring, standing and cooling to obtain the pickling agent.
The above; but are merely preferred embodiments of the invention; the scope of the invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.
Claims (10)
1. The acid pickling agent for producing the electronic product shell is characterized in that: the paint comprises the following components in percentage by mass: 30-40% of acid liquor, 4-7% of sodium bicarbonate, 5-8% of anionic surfactant, 0.5-1% of coagulant, 3-6% of dirt adsorbent, 2-4% of oxidation and corrosion inhibitor and the balance of deionized water.
2. The acid cleaning agent for producing electronic product housings of claim 1, wherein the acid cleaning agent comprises: the paint comprises the following components in percentage by mass: 35% of acid liquor, 5% of sodium bicarbonate, 6.5% of anionic surfactant, 0.75% of coagulant, 4.5% of dirt adsorbent, 3% of antioxidant and corrosion inhibitor and 45.25% of deionized water.
3. The acid cleaning agent for producing electronic product housings of claim 1, wherein the acid cleaning agent comprises: the acid solution is a mixture of organic acid and inorganic acid, and the mass ratio of the organic acid to the inorganic acid is 5-8: 1-2.
4. The acid cleaning agent for producing electronic product housings of claim 3, wherein the acid cleaning agent comprises: the organic acid is one or a mixture of more than two of citric acid, malic acid, tartaric acid, acetic acid, oleic acid, linoleic acid, succinic acid and oxalic acid.
5. The acid cleaning agent for producing electronic product housings of claim 3, wherein the acid cleaning agent comprises: the inorganic acid is one or a mixture of more than two of hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid and hydrofluoric acid.
6. The acid cleaning agent for producing electronic product housings of claim 1, wherein the acid cleaning agent comprises: the anionic surfactant is one or a mixture of more than two of sodium dodecyl benzene sulfonate, sodium hexadecylbenzene sulfonate, sodium alkyl sulfate, sodium alkyl polyoxyethylene ether sulfate, sodium fatty alcohol polyoxyethylene ether sulfate, sodium alkyl polyoxyethylene ether carboxylate, sodium alkyl sulfonate and sodium oleoyl methyl taurate.
7. The acid cleaning agent for producing electronic product housings of claim 1, wherein the acid cleaning agent comprises: the soil adsorbent is carboxymethyl cellulose.
8. The acid cleaning agent for producing electronic product housings of claim 1, wherein the acid cleaning agent comprises: the antioxidant corrosion inhibitor is a mixture of an amine antioxidant and a phenol antioxidant, wherein the mass ratio of the amine antioxidant to the phenol antioxidant is 1: 3-5, the amine antioxidant is diphenylamine, and the phenol antioxidant is 2, 6-di-tert-butyl-p-cresol.
9. The acid cleaning agent for producing electronic product housings of claim 1, wherein the acid cleaning agent comprises: the coagulant is one or a mixture of more than two of polyaluminium chloride, polyaluminium sulfate, polyferric chloride and polyferric sulfate.
10. A method for preparing the acid cleaning agent for the production of the electronic product housing according to any one of claims 1 to 9, wherein the acid cleaning agent comprises: the method comprises the following steps:
s1, preparing acid liquor, sodium bicarbonate, an anionic surfactant, a coagulant, a dirt adsorbent, an antioxidant and corrosion inhibitor and deionized water according to the mass percentage;
s2, putting the deionized water and the acid liquor into a corrosion-resistant stirring tank, and fully stirring, mixing and uniformly mixing to obtain a mixed liquor A;
s3, adding sodium bicarbonate and an anionic surfactant into the mixed solution A, heating to 50-60 ℃, and fully and uniformly stirring to obtain a mixed solution B;
s4, adding a coagulant, a dirt adsorbent and an oxidation and corrosion inhibitor into the mixed solution B, keeping the temperature at 50-60 ℃, fully and uniformly stirring, standing and cooling to obtain the pickling agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010495214.6A CN111519193A (en) | 2020-06-03 | 2020-06-03 | Pickling agent for producing electronic product shell and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010495214.6A CN111519193A (en) | 2020-06-03 | 2020-06-03 | Pickling agent for producing electronic product shell and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111519193A true CN111519193A (en) | 2020-08-11 |
Family
ID=71909794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010495214.6A Pending CN111519193A (en) | 2020-06-03 | 2020-06-03 | Pickling agent for producing electronic product shell and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111519193A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114921741A (en) * | 2022-05-26 | 2022-08-19 | 中电建武汉铁塔有限公司 | Hot galvanizing process |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3346504A (en) * | 1962-08-10 | 1967-10-10 | Procter & Gamble | Detergent compositions |
| CN103603001A (en) * | 2013-11-06 | 2014-02-26 | 天津圳鹏清洗技术开发有限公司 | Copper alloy low-temperature cleaning agent |
| CN104233328A (en) * | 2014-09-25 | 2014-12-24 | 无锡康柏斯机械科技有限公司 | Powdery composition for cleaning metal surface and preparation method thereof |
| CN108546953A (en) * | 2018-05-09 | 2018-09-18 | 北京乐文科技发展有限公司 | A kind of heating furnace tube outer wall washing passivator |
| CN110042010A (en) * | 2019-05-28 | 2019-07-23 | 马鞍山华之杰金属表面处理剂有限公司 | A kind of environment protection type multifunctional agent for carbon hydrogen detergent and preparation method thereof |
| CN110616435A (en) * | 2019-09-17 | 2019-12-27 | 佛山市海化表面处理科技有限公司 | Oil-removing cleaning agent and preparation method thereof |
-
2020
- 2020-06-03 CN CN202010495214.6A patent/CN111519193A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3346504A (en) * | 1962-08-10 | 1967-10-10 | Procter & Gamble | Detergent compositions |
| CN103603001A (en) * | 2013-11-06 | 2014-02-26 | 天津圳鹏清洗技术开发有限公司 | Copper alloy low-temperature cleaning agent |
| CN104233328A (en) * | 2014-09-25 | 2014-12-24 | 无锡康柏斯机械科技有限公司 | Powdery composition for cleaning metal surface and preparation method thereof |
| CN108546953A (en) * | 2018-05-09 | 2018-09-18 | 北京乐文科技发展有限公司 | A kind of heating furnace tube outer wall washing passivator |
| CN110042010A (en) * | 2019-05-28 | 2019-07-23 | 马鞍山华之杰金属表面处理剂有限公司 | A kind of environment protection type multifunctional agent for carbon hydrogen detergent and preparation method thereof |
| CN110616435A (en) * | 2019-09-17 | 2019-12-27 | 佛山市海化表面处理科技有限公司 | Oil-removing cleaning agent and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 邢凤兰等: "《印染助剂》", 31 August 2002, 化学工业出版社 精细化工出版中心 * |
| 高会芳等: "《机电工程建造师便携手册》", 31 May 2009, 辽宁科学技术出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114921741A (en) * | 2022-05-26 | 2022-08-19 | 中电建武汉铁塔有限公司 | Hot galvanizing process |
| CN114921741B (en) * | 2022-05-26 | 2023-11-10 | 中电建武汉铁塔有限公司 | Hot galvanizing process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103409808B (en) | Polycrystalline silicon texturing additive and using method thereof | |
| CN103603001B (en) | One Albatra metal-low-temperature cleaning agent | |
| CN101760743A (en) | Tin stripping liquid | |
| CN105714298A (en) | Tin stripping agent based on sulfuric acid-ferric salt system and preparing method of tin stripping agent | |
| CN110042403A (en) | Deashing agent and preparation method thereof, application and silico-aluminum process for deashing | |
| CN111519193A (en) | Pickling agent for producing electronic product shell and preparation method thereof | |
| CN103184456A (en) | Environment-friendly long-life emulsified antirust agent and preparation method thereof | |
| CN107345089A (en) | A kind of glass deinking agent | |
| CN111748817A (en) | Tin stripping water additive | |
| CN102391210B (en) | Method for preparing epoxy fatty acid methyl ester | |
| CN107055892B (en) | Method for microwave-assisted catalytic oxidation of biochemical tail water of brewing wastewater by compounding of multiple metals | |
| CN103938217A (en) | Neutral rust remover | |
| CN103555431A (en) | Printed circuit board cleaning agent and preparation method thereof | |
| CN110195222A (en) | A kind of RTR subtracts copper post-processing copper foil surface passivator and its use and preparation method | |
| CN103820805A (en) | Rust removal cleaning agent | |
| CN103525586A (en) | Printed circuit board cleaning agent and preparation method thereof | |
| CN109810795B (en) | Polyether surfactant, synthetic method thereof and neutral cleaning agent | |
| CN103232118A (en) | Sodium lignin sulfonate compound corrosion and scale inhibitor and preparation method thereof | |
| CN103695915A (en) | Emulsion-type antirust liquid and preparation method thereof | |
| CN110387549B (en) | Additive and method for inhibiting residual iron powder on surface of steel coil subjected to acid pickling | |
| CN104450029A (en) | Anti-oxidation thixotropy anti-rusting oil | |
| CN110923728A (en) | Ammonia nitrogen-free film removing liquid for flexible circuit board and preparation method thereof | |
| CN113637531A (en) | Oil removing agent for cleaning metal workpiece of electronic product and preparation method thereof | |
| CN103397316B (en) | A kind of acidic chemical copper facing composite additive and preparation method thereof and using method | |
| CN110004444A (en) | A kind of pair of circuit board stings the micro-corrosion liquid lost |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200811 |