CN116219503A

CN116219503A - Wear-resistant and water-resistant process for metal black coating and detection process thereof

Info

Publication number: CN116219503A
Application number: CN202310283236.XA
Authority: CN
Inventors: 张少涛; 解培玄; 李涛; 朱世忠
Original assignee: Shishi Shangyu Hardware Accessories Co ltd
Current assignee: Shishi Shangyu Hardware Accessories Co ltd
Priority date: 2023-03-22
Filing date: 2023-03-22
Publication date: 2023-06-06

Abstract

The invention discloses a wear-resistant and water-resistant process for a black metal coating and a detection process thereof, which belong to the field of metal processing, and the invention uses a coloring process commonly used by the existing products to carry out large-scale superposition, so that the advantages of two traditional processes are retained, namely, the hardness and excellent wear resistance of metal plating are retained, the color which cannot be displayed by the plating is solved by paint spraying or electrophoresis, and the processes have no additional new process, so that a large amount of investment in equipment and technology is caused, the problem is solved by lower cost, and the popularization in the industry is facilitated.

Description

Wear-resistant and water-resistant process for metal black coating and detection process thereof

Technical Field

The invention discloses a wear-resistant and water-resistant process for a metal black coating and a detection process thereof, belonging to the field of metal processing.

Background

The metal water washing process is metal surface treatment.

When the metal auxiliary materials of the clothes such as the zipper head, the button, the adjusting button and the like are black, the abrasion fading caused by the swinging of the connecting part of the pull piece and the zipper head and the friction between the button and the adjusting button and the washing machine cannot be avoided no matter the paint spraying or the electrophoresis black. Especially in the clothes washing process, the color fading phenomenon is more serious due to long-time swing friction caused by the rotation of the washing machine, so that the positions such as the periphery of the adjusting button at the nose bridge position of the zipper head, the joint of the tail part of the zipper piece and the pull ring and the edge of the button leak out of the metal material bottom layer due to color falling. In addition to the visual deterioration, the metal material losing the protective layer is more prone to oxidation corrosion in air, particularly to corrosion aggravated by contact with water, and becomes brittle and is prone to fracture.

Disclosure of Invention

The invention aims to solve the problems and provide a wear-resistant and water-resistant process for a metal black coating and a detection process thereof.

The invention realizes the aim through the following technical scheme, and the wear-resistant and water-washing-resistant process for the metal black coating comprises the following steps:

s1, pretreatment: rough machining is carried out on the metal material, and bubbles, sand holes and water waves of the metal material are eliminated;

s2, acid washing: taking out surface impurities from the product subjected to S1 pretreatment through acid washing, phosphating and passivating, washing with clear water, soaking with pure water at 80-90 ℃, and finally fishing out and drying;

s3, electroplating: placing the dried product in the step S2 into an alkaline copper electroplating bath, electrifying and electroplating for 8-12 minutes, then placing into pure water for cleaning, fishing out, placing into an acid copper electroplating bath, electrifying and electroplating for more than 30 minutes, and finally placing into the pure water for cleaning;

s4 blackening: putting the product subjected to S3 cleaning into blackening solution until a black oxide film is generated on the surface of the acid copper layer, putting the blackened metal material into pure water for cleaning, and finally taking out and drying;

s5, finish machining: and (3) placing the blackened product on a net tray or a hanger, and then carrying out surface spraying or electrophoresis black processing.

Preferably, the electroplating duration of adding the acid copper in the step S3 is in direct proportion to the size of the workpiece, and the electroplating duration of adding the acid copper in the step S3 is in direct proportion to the size of the workpiece.

Preferably, the main substances contained in the blackening solution in S4 are: sodium hydroxide, copper sulfate and sodium nitrite, the proportion of which is: 5 parts of sodium hydroxide: 4 parts of copper sulfate: 1 part of sodium nitrite, and the blackening solution is heated to 130-160 ℃ during dip dyeing.

Preferably, the spraying in S5 uses an electrostatic spray gun to mix the dark paint with diluent 1:1, uniformly spraying the mixture on the surface of a product.

Preferably, the electrophoresis in S5 adopts a cathode electrophoresis process, and after the electrophoresis is completed, the electrophoresis is washed by clean water, and then the electrophoresis is put into an oven to be baked for 50+/-5 minutes at 180+/-5 ℃.

The metal black coating detection process comprises the following steps:

s6, hundred grid test: randomly extracting a plurality of finished products, drawing a plurality of square grids on the surface of the products on the flatter side of the products by a blade, cleaning the cut joints by a soft brush, stably adhering the cut joints to the surface of the drawn square grids by an 80-viscosity adhesive tape, pressing the adhesive tape for 3-5 minutes, tearing the adhesive tape at the utilization degree of 60 DEG + -3 DEG within 0.5-1 seconds, observing the paint shedding degree of the surface of the products, and obtaining qualified products if the surfaces are free of shedding and the adhesive tape is free of adhesion;

s7, salt spray test: taking a plurality of products subjected to S5 finish machining, carrying out grouping test, putting the products subjected to grouping test into a constant temperature and humidity salt spray tester, then putting 5% sodium chloride solution into the salt spray tester, settling salt spray on the surface of the products according to settlement amount of 1-2 ml/(h 80 cm), taking out the products after 72 hours of uninterrupted settlement, and observing the surfaces of the products, wherein no surface change is qualified;

s8, washing test: fixing the product on a cloth piece with the thickness of more than or equal to 30cm, then placing the cloth piece into a washing machine at normal temperature, adding a proper amount of clear water, starting the washing machine to wash, taking out the cloth piece after washing for 4 hours, and observing that the surface is free from obvious abrasion, thus obtaining the qualified product.

Preferably, the square specification drawn in S6 is 1 x 1mm.

Preferably, the temperature in S7 is 30-40 ℃ and the humidity is 95% or more.

Preferably, the abrasion range in S8 is that the edge abrasion is less than 1mm, and the continuous abrasion paint dropping of the joint of the movable product is less than 3mm.

Compared with the prior art, the invention has the beneficial effects that: the coloring technology commonly used by the existing products is utilized for large-scale superposition, so that the advantages of the two traditional technologies are maintained, namely, the hardness and excellent wear resistance of metal plating are maintained, and the color which cannot be displayed by the plating is solved by utilizing paint spraying or electrophoresis. The technology has no additional new technology, so that a large amount of investment in equipment and technology is generated, the problem is solved by using lower cost, and the popularization in the industry is facilitated.

Drawings

FIG. 1 is a schematic illustration of the process flow of the present invention.

Description of the embodiments

In the following description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 1, the wear-resistant and water-washing-resistant process for the metal black coating comprises the following steps:

s1, pretreatment: rough machining is carried out on the metal material, and bubbles, sand holes and water waves of the metal material are eliminated; the blank product raw material produced by taking copper/iron/zinc alloy as a base material is firstly pretreated, and then polished, water ground, cut and the like, so that the blank product cannot have defects such as bubbles, sand holes, water waves and the like, and the defects can cause phenomena such as surface bulge, pits and the like due to high temperature in subsequent process processing, so that the surface has no defects in the prior process, the damage and scrapping of the product after the production is finished are avoided, finally, different types of products are assembled to form a finished product, and then the product is sent to the next working procedure.

S2, acid washing: taking out surface impurities from the product subjected to S1 pretreatment through acid washing, phosphating and passivating, washing with clear water, soaking with pure water at 85 ℃, and finally fishing out and drying; the product is subjected to acid washing, oil stain, polishing paste and other surface stains on the surface in the production and processing process are removed through sulfuric acid, hydrofluoric acid or oxalic acid, then the product is subjected to phosphating, passivation and washing with clear water, then the product is subjected to high-temperature pure water washing to avoid acid liquor residues, and finally the washed product is dehydrated and then dried for later use.

S3, electroplating: placing the dried product in the step S2 into an alkaline copper electroplating bath, electrifying and electroplating for 10 minutes, then placing into pure water for cleaning, fishing out, placing into an acid copper electroplating bath, electrifying and electroplating for more than 30 minutes, and finally placing into the pure water for cleaning; and cleaning the product plated with the alkaline copper, placing the product into an acid copper electroplating bath, electrifying for 35 minutes, wherein the proper extension time is prolonged according to the size of a workpiece, generally, the larger the work is, the longer the required time is, then taking out the product, placing the product into pure water for cleaning, and removing electroplating liquid residues on the surface of the product.

S4 blackening: putting the product subjected to S3 cleaning into blackening solution until a black oxide film is generated on the surface of the acid copper layer, putting the blackened metal material into pure water for cleaning, and finally taking out and drying; and cleaning the product plated with the acid copper, and then placing the product into a blackening solution. The process adopts an alkaline heating blackening process, and comprises the steps of mixing 5 parts of sodium hydroxide, 4 parts of copper sulfate and 1 part of sodium nitrite, heating the solution to 130-160 ℃ to generate chemical reaction, generating a black oxide film and black powder on the surface of an acid copper layer, taking out the heated blackening product, washing in pure water, dehydrating and drying for later use.

S5, finish machining: placing the blackened product on a net tray or a hanger, and then carrying out surface spraying or electrophoresis black processing; and placing the blackened product on a special net tray or a hanger for surface spraying or electrophoresis black processing. The spraying is to uniformly spray the diluted paint on the surface of the product by using an electrostatic spray gun, and then drying the product at a high temperature of 110-130 ℃ for 45 minutes. The scheme is suitable for dark color systems such as black, deep blue, deep brown and the like, and cannot be applied to light color systems such as Huang Baihui and the like so as not to influence the surface color due to the color penetration of the ground color. The electrophoresis process uses a cathode electrophoresis process.

The electrophoresis process is a process that charged resin particles in the solution move under the action of an electric field and are deposited on the surface of metal to form a protective coating, and compared with the anodic electrophoresis, the cathodic electrophoresis has much better corrosion resistance of the coating, thereby better protecting the product. The product after electrophoresis is washed by clean water and then enters an oven to be dried for 50 minutes at 180 ℃. The scheme is suitable for black electrophoretic paint.

Since the electroplating temperature is usually 90 ℃, and the electrophoresis process temperature reaches 180 ℃, the process superposition causes the bubbling and swelling phenomenon of most electroplating colors at high temperature. Therefore, the products which are screened out and processed by the process superposition are subjected to surface inspection, and the products with low reject ratio and high color combination degree are obtained. The invention has the key points that the two independent coloring technologies are overlapped by technology traditionally, so that the stability of the surface color and the enhancement of the color fastness and the wear resistance are realized.

The production process of the product is finished, but quality inspection and detection are needed to ensure that the quality of the product is kept at excellent quality after leaving the factory.

The metal black coating detection process comprises the following steps:

s6, hundred grid test: randomly extracting a plurality of products after finishing, smoothly cutting 6-8 lines on the surface of the products at intervals of about 1mm on one side of the products, then cutting 6-8 lines in an equal way perpendicular to the original lines after rotating the products by 90 degrees, cleaning the cut seams by a soft brush, stably adhering the cut seams to the surface of the cut squares by an adhesive tape with 80 viscosity, pressing the adhesive tape for 5 minutes, tearing the adhesive tape at an included angle of 60 degrees within 0.75 seconds, and observing and testing the paint shedding degree of the surface of the products, particularly the paint shedding degree of the edges of the small square squares, wherein the paint is qualified if the surface is free of shedding and the adhesive tape is free of sticky paint;

s7, salt spray test: taking a plurality of products subjected to S5 finish machining, carrying out grouping test, putting the products subjected to grouping test into a constant temperature and humidity salt spray tester, then putting 5% sodium chloride solution into the salt spray tester, settling salt spray on the surface of the products according to settlement amount of 1.5 ml/(h 80 cm), requiring 72 hours of salt spray visual observation on the conditions of no corrosion, rust, foaming and the like, and wiping the surface of the products with soft cloth until no obvious change is qualified;

s8, washing test: fixing the product on a cloth piece with the thickness of more than or equal to 30cm, then placing the cloth piece into a washing machine at normal temperature, adding a proper amount of clear water, starting the washing machine to wash, taking out the cloth piece after washing for 4 hours, and observing that the surface is free from obvious abrasion, thus obtaining the qualified product. The products should be evenly distributed. Putting into washing machine at normal water temperature, adding detergent, and opening standard washing program for 4 hr. And taking out the products after the test is finished and observing the products respectively. The surface of the product is required to be washed for 4 hours, the abrasion of the peripheral edge cannot be more than 1mm, and the continuous abrasion of the connecting part of the product is not more than 3mm, so that the product is qualified.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims

1. The wear-resistant and water-washing-resistant process for the metal black coating is characterized by comprising the following steps of:

2. The metallic black coating abrasion-resistant and wash-resistant process of claim 1, wherein: and S3, adding acid copper, wherein the electroplating duration is in direct proportion to the size of the workpiece.

3. The metallic black coating abrasion-resistant and wash-resistant process of claim 1, wherein: the main substances contained in the blackening solution substance in S4 are as follows: sodium hydroxide, copper sulfate and sodium nitrite, the proportion of which is: 5 parts of sodium hydroxide: 4 parts of copper sulfate: 1 part of sodium nitrite, and the blackening solution is heated to 130-160 ℃ during dip dyeing.

4. The metallic black coating abrasion-resistant and wash-resistant process of claim 1, wherein: spraying in S5 dark paint with diluent 1 using an electrostatic spray gun: 1, uniformly spraying the mixture on the surface of a product.

5. The metallic black coating abrasion-resistant and wash-resistant process of claim 1, wherein: and S5, adopting a cathode electrophoresis process, washing with clear water after electrophoresis is completed, and then putting the product into an oven to bake for 50+/-5 minutes at 180+/-5 ℃.

6. The metal black coating detection process comprises the following steps:

7. The metallic black coating detection process of claim 6, wherein: the square specification drawn in S6 is 1 x 1mm.

8. The metallic black coating detection process of claim 6, wherein: the temperature in S7 is 30-40 ℃ and the humidity is 95% or above.

9. The metallic black coating detection process of claim 6, wherein: and S8, the abrasion range in the S8 is that the edge abrasion is less than 1mm, and the continuous abrasion paint dropping of the joint of the movable product is less than 3mm.