CN111549372A - Method for improving binding force of hard chromium coating and steel substrate - Google Patents
Method for improving binding force of hard chromium coating and steel substrate Download PDFInfo
- Publication number
- CN111549372A CN111549372A CN202010432201.4A CN202010432201A CN111549372A CN 111549372 A CN111549372 A CN 111549372A CN 202010432201 A CN202010432201 A CN 202010432201A CN 111549372 A CN111549372 A CN 111549372A
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- steel
- hard chromium
- electrolytic polishing
- improving
- treatment
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F3/00—Electrolytic etching or polishing
- C25F3/16—Polishing
- C25F3/22—Polishing of heavy metals
- C25F3/24—Polishing of heavy metals of iron or steel
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
- C25D5/36—Pretreatment of metallic surfaces to be electroplated of iron or steel
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating And Plating Baths Therefor (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
The invention discloses a method for improving the binding force of a hard chromium coating and a steel substrate. The method comprises the following steps: mechanically polishing and deoiling the steel piece, then soaking the steel piece in electrolytic polishing solution, and performing electrolytic polishing treatment to obtain a polished steel piece; and carrying out electroplating hard chromium treatment on the polished steel piece by using a DMF system to obtain the steel piece attached with a hard chromium coating. Before the chromium plating, the method adds the electrolytic polishing treatment besides the conventional polishing and oil removing treatment to the steel substrate, can remove the surface stress generated in the mechanical polishing process of the steel surface, obtain a smooth steel surface, reduce the stress of the chromium plating layer and improve the combination between the chromium plating layer and the substrate.
Description
Technical Field
The invention belongs to the field of material surface treatment, and particularly relates to a method for improving binding force of an electroplated chromium layer and a steel substrate.
Background
The electroplated trivalent hard chromium layer has a high hardness (typically about HV 1000) and has good wear resistance. Compared with hexavalent chromium electroplating, the toxicity of the electroplating solution is only one percent of that of hexavalent chromium. The electroplating process is simple, the efficiency is high, and the processing cost is low. The surface brightness can be kept for a long time in the air. The method for improving the surface hardness of the workpiece by electroplating the trivalent hard chromium is one of the most economic methods in surface engineering, and provides the most extensive means for providing a wear-resistant layer and a protective layer on the surface of metal parts such as steel and the like.
However, the electroplated hard chromium coating has larger tensile stress, so that the electrodeposited layer has microcracks, and the bonding force between the coating and a matrix is reduced, (1) the materials such as steel and the like needing corrosion resistance protection are corroded prematurely; (2) resulting in coating breakage or peeling during rubbing of moving parts. Therefore, the development and research of the technology for improving the binding force of the coating and the substrate have important significance.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a method for improving the bonding force of a hard chromium plating layer and a steel matrix. The method provided by the invention is suitable for the pretreatment of chromium electroplating of the steel substrate, and the binding force between the plating layer and the steel substrate is improved, so that the service life of the chromium-plated layer workpiece is prolonged.
The purpose of the invention is realized by at least one of the following technical solutions.
The invention provides a method for improving the binding force of a hard chromium plating layer and a steel substrate, which comprises the following steps:
(1) firstly, mechanically polishing and degreasing a steel piece according to a conventional process, then soaking the steel piece in electrolytic polishing solution, and performing electrolytic polishing treatment by adopting a special electrolytic polishing power supply to obtain a polished steel piece;
(2) and (2) carrying out electroplating hard chromium treatment on the polished steel part in the step (1) by using a common DMF system to obtain the steel part attached with a hard chromium coating.
Further, the electrolytic polishing solution in the step (1) is a mixed solution obtained by uniformly mixing perchloric acid, methanol and glacial acetic acid.
Preferably, the electrolytic polishing solution comprises 5-15% of perchloric acid, 10-15% of methanol and the balance of glacial acetic acid by volume percentage.
Further, the current density of the electrolytic polishing treatment in the step (1) is 1.5-2.0A/cm2。
Preferably, the current density of the electrolytic polishing treatment in the step (1) is 1.7-1.8A/cm2。
Further, the time of the electrolytic polishing treatment in the step (1) is 1-3 minutes.
Preferably, the time of the electrolytic polishing treatment in the step (2) is 2 minutes.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the method provided by the invention forms a 'fresh' and 'clean' electroplating substrate on the metal surface due to the electrolytic polishing on the material surface, so that a 'metallurgical-like' bonding layer is formed between the electroplated chromium layer and the matrix, and the bonding force between the electroplated hard chromium layer and the matrix is greatly improved.
Detailed Description
The following examples are presented to further illustrate the practice of the invention, but the practice and protection of the invention is not limited thereto. It is noted that the processes described below, if not specifically described in detail, are all realizable or understandable by those skilled in the art with reference to the prior art. The reagents or apparatus used are not indicated to the manufacturer, and are considered to be conventional products available by commercial purchase.
Example 1
Selecting 9 pieces of H13 steel as a research object, and respectively preparing three groups of electrolytes according to volume percentage: (1) 5% perchloric acid, 10% methanol and the balance glacial acetic acid; (2) 12% perchloric acid, 15% methanol, the remainder being glacial acetic acid: (3) 15% perchloric acid, 12% methanol and the remainder glacial acetic acid. Respectively adopting the above electrolytes at a rate of 1.5, 1.8 and 2.0A/cm2The electropolishing was carried out at current densities for 1 minute. The above treatment can obtain a mirror bright electropolished surface. The time is prolonged, the thickness of the surface layer removed by polishing is increased, the grinding marks left by the pretreatment can be more effectively removed, but the influence of the polishing thickness on the size precision of the workpiece needs to be considered, and the polishing time is 1 minuteThe thickness is 15-20 μm.
The test example provided by the invention is that two groups of samples of the same steel substrate are taken, and one group is electroplated according to the conventional DMF system hard chromium electroplating process and then is subjected to a bonding force test; the second group of the methods firstly carries out electrolytic polishing according to the invention, then carries out conventional DMF system hard chrome electroplating process electroplating on the sample, and then carries out the bonding force test. The test results are as follows:
the first group respectively takes three H13 steel samples, carries out pretreatment according to the conventional process, and then electroplates the hard chrome layer with the thickness of 15-30 mu m according to the conventional DMF system electroplating hard chrome process; then, the binding force is tested according to the VDI3198-1992 standard, and the binding force is HF5 or HF6 grade;
the second group respectively takes three H13 steel samples, pre-processes according to the conventional process, and then adopts mixed electrolytic polishing solution (volume percentage) composed of 12% perchloric acid, 15% methanol and glacial acetic acid, and the current density is 1.7-1.8A/cm2Carrying out electrolytic polishing treatment on the sample, wherein the time of the electrolytic polishing treatment is 2 min; electroplating to a hard chromium layer with the thickness of 15-30 μm according to a conventional DMF system hard chromium electroplating process; then, the binding force was tested according to VDI3198-1992, and the binding force reached grade HF 2.
According to the test, the sample is electroplated with hard chromium after being subjected to electrolytic polishing, so that the binding force between the electroplated layer and the matrix can be effectively improved.
The above examples are only preferred embodiments of the present invention, which are intended to be illustrative and not limiting, and those skilled in the art should understand that they can make various changes, substitutions and alterations without departing from the spirit and scope of the invention.
Claims (6)
1. A method for improving the binding force of a hard chromium plating layer and a steel matrix is characterized by comprising the following steps:
(1) mechanically polishing and deoiling the steel piece, then soaking the steel piece in electrolytic polishing solution, and performing electrolytic polishing treatment to obtain a polished steel piece;
(2) and (3) carrying out electroplating hard chromium treatment on the polished steel part in the step (1) by using a DMF system to obtain the steel part attached with a hard chromium coating.
2. The method for improving the binding force of the hard chromium plating layer and the steel matrix according to claim 1, wherein the electrolytic polishing solution in the step (1) is a mixed solution obtained by uniformly mixing perchloric acid, methanol and glacial acetic acid.
3. The method of claim 2, wherein the electrolytic polishing solution comprises, by volume percent, 5-15% perchloric acid, 10-15% methanol, and the balance glacial acetic acid.
4. The method for improving the bonding strength of a hard chromium coating to a steel substrate according to claim 1, wherein the current density of the electrolytic polishing treatment of step (1) is 1.5 to 2.0A/cm2。
5. The method for improving the bonding strength of a hard chromium coating to a steel substrate according to claim 4, wherein the current density of the electrolytic polishing treatment of step (1) is 1.7 to 1.8A/cm2。
6. The method for improving the bonding force of a hard chromium coating to a steel substrate according to claim 1, wherein the time of the electrolytic polishing treatment in step (1) is 1 to 3 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010432201.4A CN111549372A (en) | 2020-05-20 | 2020-05-20 | Method for improving binding force of hard chromium coating and steel substrate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010432201.4A CN111549372A (en) | 2020-05-20 | 2020-05-20 | Method for improving binding force of hard chromium coating and steel substrate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111549372A true CN111549372A (en) | 2020-08-18 |
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| CN202010432201.4A Pending CN111549372A (en) | 2020-05-20 | 2020-05-20 | Method for improving binding force of hard chromium coating and steel substrate |
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2020
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