CN109735885B - Pre-plating rust prevention process for steel part - Google Patents
Pre-plating rust prevention process for steel part Download PDFInfo
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- CN109735885B CN109735885B CN201910182791.7A CN201910182791A CN109735885B CN 109735885 B CN109735885 B CN 109735885B CN 201910182791 A CN201910182791 A CN 201910182791A CN 109735885 B CN109735885 B CN 109735885B
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Abstract
The invention discloses a pre-plating rust prevention process for steel parts, which is used for preventing rust of products with plated layers and comprises the following steps: s1: removing the plating by hydrochloric acid, and removing the plating layer on the surface of the product with the plating layer; s2: washing with water; s3: rust prevention treatment, namely performing rust prevention treatment on the product subjected to the deplating water washing in the steps S1 and S2; s4: and (5) drying. The antirust agent is prepared by mixing the sodium nitrite, the triethanolamine and the sodium carbonate in proportion to replace the antirust of a sodium hydroxide solution in the prior art, avoids the damage of strong alkali corrosion to an electroplating product, forms an antirust protective layer on the surface of the product, has the advantages of simple and easily obtained materials, good antirust effect and long antirust time, and reduces the treatment cost of enterprises.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the technical field of metal product surface treatment, and particularly relates to a pre-plating rust prevention process for steel parts.
[ background of the invention ]
After the steel electroplating part product is deplated, the surface quality needs to be improved by a surface rust prevention process so as to be convenient for storage and utilization, the most common rust prevention process in the current common electroplating plants generally adopts a sodium hydroxide solution as a main material, but the process has many defects, firstly, the sodium hydroxide has strong corrosivity and is easy to cause excessive damage to the product and potential safety hazard; secondly, alkaline spots are formed after the product is dried, and the product is easily scrapped due to the defect of alkaline corrosion after the electroplating pretreatment is finished; finally, the rust prevention effect is poor, the rust prevention time is extremely short, and the treatment cost of a treatment plant is increased.
Aiming at various defects in the prior art, a process technology which has simple and safe working procedures, strong adaptability, no damage to products and long antirust effect time is required to be provided.
[ summary of the invention ]
In order to solve the existing problems in the background art, the invention provides a rust prevention process before plating for steel parts, which can well solve the existing treatment technology and has the advantages of simple and safe working procedures, strong adaptability, product protection and long-acting rust prevention time and good effect.
The invention adopts the following technical scheme:
a rust prevention process before plating for steel parts is used for preventing rust of products with coatings, and comprises the following steps:
s1: removing the plating by hydrochloric acid, and removing the plating layer on the surface of the product with the plating layer;
s2: washing with water;
s3: rust prevention treatment, namely performing rust prevention treatment on the product subjected to the deplating water washing in the steps S1 and S2;
s4: and (5) drying.
Preferably, in the step S1, the hydrochloric acid concentration is 150-200g/L, and the plated product is soaked in the hydrochloric acid for 1-3min at normal temperature.
Preferably, in the step S2, the water flow rate of the washing water is 200-250 l/h.
Preferably, the step S3 comprises mixing and blending 30-50g/L sodium nitrite, 5ml/Ld triethanolamine and 8-10g/L sodium carbonate, and soaking the product in the mixture for 30-120S.
Preferably, the product obtained after the step S4 is dried and stored at the temperature of 90 ℃.
The invention has the following beneficial effects:
according to the invention, sodium nitrite, triethanolamine and sodium carbonate are proportionally mixed to replace the rust prevention of a sodium hydroxide solution in the prior art, so that the damage of strong alkali corrosion to an electroplating product is avoided, a rust prevention protective layer is formed on the surface of the product, the material is simple and easy to obtain, the rust prevention effect is good, the rust prevention time is long, and the treatment cost of an enterprise is reduced.
[ description of the drawings ]
FIG. 1 is a schematic flow diagram of the present invention.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention.
A rust prevention process before plating for steel parts is used for rust prevention of a product with a plated layer, and referring to figure 1, the rust prevention process comprises the following steps:
s1: and (2) hydrochloric acid deplating, namely performing surface electroplating layer deplating on the product with the plating layer, wherein the concentration of the hydrochloric acid is 150-200g/L, soaking the product in the hydrochloric acid at normal temperature for 1-3min, performing acidification reaction on the plating layer and the hydrochloric acid to generate a metal salt product, removing the plating layer on the surface of the product, and performing rust prevention treatment.
S2: and (4) washing, namely controlling the water flow at 200-250 l/h to wash the product obtained after the step S1, and washing the outer surface of the product to be clean, so that no acid liquor is remained, and the reaction with other solutions in the subsequent process is avoided.
S3: and (2) performing rust prevention treatment, namely performing rust prevention treatment on the product subjected to the deplating water washing in the steps S1 and S2, mixing 30-50g/L sodium nitrite, 5ml/Ld triethanolamine and 8-10g/L sodium carbonate according to the proportion, soaking the product, maintaining for 30-120S, attaching a special rust prevention layer on the surface of the product after reaction, isolating the contact with air moisture, further performing rust prevention, and not corroding the product.
S4: and (4) drying, namely, naturally drying the product after the step S3 in an environment of below 90 ℃, wherein the product can generally prevent rust for two weeks in a normal environment after drying, and the time is at least one week longer than the conventional rust prevention time, so that the process is simple, the product is harmless, and the rust prevention time is long.
The raw material product without the coating is directly washed by water and then subjected to the rust prevention process of step S3, and is directly soaked in step S3 for rust prevention, and the rust prevention time can exceed 3 months.
The invention has the advantages that:
according to the invention, sodium nitrite, triethanolamine and sodium carbonate are proportionally mixed to replace the rust prevention of a sodium hydroxide solution in the prior art, so that the damage of strong alkali corrosion to an electroplating product is avoided, a rust prevention protective layer is formed on the surface of the product, the material is simple and easy to obtain, the rust prevention effect is good, the rust prevention time is long, and the treatment cost of an enterprise is reduced.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (3)
1. A rust prevention process before plating for steel parts is used for preventing rust of products with coatings, and is characterized by comprising the following steps:
s1: hydrochloric acid deplating, namely performing surface electroplating layer deplating on the product with the plating layer, wherein the concentration of the hydrochloric acid is 150-200g/L, and soaking the product with the plating layer in the hydrochloric acid for 1-3min at normal temperature;
s2: washing with water;
s3: performing rust prevention treatment, namely performing rust prevention treatment on the product subjected to the deplating water washing in the steps S1 and S2, mixing and blending 30-50g/L of sodium nitrite, 5ml/L of triethanolamine and 8-10g/L of sodium carbonate in a rust prevention solution, and soaking the product in the mixture for 30-120S;
s4: and (5) drying.
2. The pre-plating rust prevention process for steel parts according to claim 1, characterized by comprising: in the step S2, the water flow rate of the washing water is 200-250L/h.
3. The pre-plating rust prevention process for steel parts according to claim 1, characterized by comprising: and drying and storing the product obtained in the step S4 at the temperature of 90 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910182791.7A CN109735885B (en) | 2019-03-12 | 2019-03-12 | Pre-plating rust prevention process for steel part |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910182791.7A CN109735885B (en) | 2019-03-12 | 2019-03-12 | Pre-plating rust prevention process for steel part |
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| Publication Number | Publication Date |
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| CN109735885A CN109735885A (en) | 2019-05-10 |
| CN109735885B true CN109735885B (en) | 2021-05-18 |
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| CN201910182791.7A Active CN109735885B (en) | 2019-03-12 | 2019-03-12 | Pre-plating rust prevention process for steel part |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS619579A (en) * | 1984-06-25 | 1986-01-17 | Nippon Steel Corp | Corrosion protecting method of steel structure |
| CN86105940A (en) * | 1986-09-03 | 1988-03-23 | 陈克昌 | A kind of scavenging solution of aqueous rustproof |
| CN1084534A (en) * | 1993-09-11 | 1994-03-30 | 常州金狮自行车工贸集团公司 | Water-soluble metal antirusting agent |
| CN100457970C (en) * | 2003-03-13 | 2009-02-04 | 中国第一汽车集团公司 | Non-nitrite water base antirusting agent |
| CN108396370B (en) * | 2018-04-04 | 2019-03-01 | 上饶市欧德环保有限公司 | A kind of de-plating device of electroplating parts |
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2019
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Effective date of registration: 20210422 Address after: 528400 floor 1, 2, west of floor 3, No.2 Ruifeng Road, Sanjiao Town, Zhongshan City, Guangdong Province Applicant after: Maester (Zhongshan) automotive surface technology Co.,Ltd. Address before: 519107 South 3111 Pearl Peak Avenue, Doumen District, Zhuhai City, Guangdong Province (4th Floor, 3rd Factory Building) Applicant before: ZHUHAI MASITE ZINC NICKEL PROCESSING Co.,Ltd. |
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