Electroplating electrophoresis process for low-carbon steel heating radiator

Abstract

The invention relates to the technical field of heating radiator electroplating and electrophoresis, in particular to a low-carbon steel heating radiator electroplating and electrophoresis process which comprises the following steps: step 1, pretreatment: carrying out surface pretreatment on a heating radiator to be subjected to electroplating and electrophoresis; 2, electrophoresis is conducted, specifically, the pretreated heating radiator is placed in electrophoresis liquid of electrophoresis equipment to be subjected to electrophoresis treatment, and an electrophoresis coating is formed on the surface of the heating radiator; 3, spraying is conducted, specifically, heat conduction paint is sprayed to the surface of the electrophoresis coating obtained after electrophoresis of the heating radiator, and a heat conduction coating is formed on the surface of the heating radiator; 4, curing is conducted, specifically, the sprayed heating radiator is subjected to surface heat conduction coating curing treatment through curing equipment; 5, electroplating is conducted, specifically, the heating radiator subjected to electrophoresis curing is placed in electroplating liquid of electroplating equipment to be subjected to electroplating treatment, and an electroplating coating is formed on the surface of the heating radiator; the protective layer of a five-layer structure is formed on the surface of the heating radiator, the adhesive force and uniformity are excellent, and the adhesive force is increased through the microporous layer.

Description

Technical Field

[0001] The invention relates to the technical field of radiator electroplating and electrophoresis, in particular to a low-carbon steel radiator electroplating and electrophoresis process. Background Art

[0002] ‌Low carbon steel radiator is a mainstream radiator, the main components are iron and carbon, with good thermal conductivity and stable heat dissipation effect. ‌Low carbon steel radiator is divided into two types: steel plate radiator and steel column radiator. It has beautiful appearance, strong selectivity, stable heat dissipation performance, and is a low-carbon energy-saving, green and environmentally friendly product trusted by the majority of users. ‌‌Electrophoresis process refers to the process in which charged resin particles (ions) in the solution move under the action of an electric field and are deposited on the metal surface to form a protective coating. The radiator forms a protective layer on the surface through the electrophoresis electroplating process.

[0003] At present, radiators are pretreated by decontamination, rust removal, cleaning and drying before electrophoretic plating. Although the electrophoretic plating surface of the radiator can be clean, the adhesion of the electrophoretic plating coating on the smooth surface of the radiator is low, and the radiator adopts a single electroplating electrophoresis to form a single protective layer, the protectiveness of the radiator surface coating is poor and the life is short. In order to solve the above-mentioned problems, the present invention proposes a low-carbon steel radiator electrophoretic plating electrophoretic process. Summary of the invention

[0004] In view of the problems in the prior art, the present invention provides a low-carbon steel radiator electroplating electrophoresis process.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a low-carbon steel radiator electroplating electrophoresis process, the electroplating electrophoresis process comprising the following steps: Step 1: Pretreatment: Surface pretreatment of the radiator to be electroplated and electrophoresed; Step 2, electrophoresis: placing the pretreated radiator in an electrophoresis solution of an electrophoresis device for electrophoresis treatment to form an electrophoretic coating on the surface of the radiator; Step 3, spraying: spraying a thermal conductive coating on the surface of the electrophoretic coating after electrophoresis of the radiator to form a thermal conductive coating on the surface of the radiator; Step 4, curing: the sprayed radiator is cured by curing equipment to cure the surface thermal conductive coating; Step 5, electroplating: placing the electrophoretically cured radiator in an electroplating solution of an electroplating device for electroplating treatment to form an electroplating coating on the surface of the radiator; Step 6, drying: drying the electroplated radiator through a drying device to dry the surface electroplating coating to obtain a radiator product; Step 7, quality inspection: Conduct electroplating and electrophoresis process inspection on the radiator products; During the radiator pretreatment process, the surface of the radiator is subjected to microporous treatment to form a primary microporous layer; After the thermal conductive coating of the radiator is cured, the surface of the thermal conductive coating of the radiator is subjected to microporous treatment to form a secondary microporous layer.

[0006] Specifically, the specific steps of the electrophoresis are as follows: S1. One-time electrophoresis: placing the pretreated radiator in a No. 1 electrophoresis tank filled with a first-level electrophoresis liquid in an electrophoresis device, performing one-time electrophoresis to form a first-level electrophoresis coating on the surface of the radiator, and then performing one-time constant temperature dust-free baking; S2, secondary electrophoresis: the radiator after the first electrophoresis is placed in the second electrophoresis tank of the electrophoresis equipment filled with the secondary electrophoresis liquid, the secondary electrophoresis forms a secondary electrophoresis coating on the surface of the radiator, and then the radiator is baked at a constant temperature and dust-free for the second time; S3, three-stage electrophoresis: place the radiator after the second electrophoresis in the No. 3 electrophoresis tank of the electrophoresis equipment filled with three-stage electrophoresis liquid, and form a three-stage electrophoresis coating on the surface of the radiator by three-stage electrophoresis, and then bake it at a constant temperature and dust-free for three times.

[0007] Specifically, the first-level electrophoretic liquid adopts water-based acrylic cathode electrophoretic paint; the second-level electrophoretic liquid adopts nanographene electrophoretic paint; the third-level electrophoretic liquid adopts polyurethane cathode electrophoretic paint; The electroplating solution is prepared by mixing nickel sulfate, sodium acetate, sodium borohydride, sodium disulfonate, borax, thiourea, copper sulfate and aminopropionic acid.

[0008] Specifically, the pore roughness of the primary microporous layer formed on the surface of the radiator is 1.0-1.5μm; the pore roughness of the secondary microporous layer formed on the surface of the thermal conductive coating of the radiator is 1.0-1.5μm; the thickness of the primary electrophoretic coating is 10-15μm; the thickness of the secondary electrophoretic coating is 15-20μm; the thickness of the tertiary electrophoretic coating is 10-15μm; the thickness of the thermal conductive coating is: 10-15μm; the thickness of the electroplating coating is 20-25μm.

[0009] Specifically, the specific steps of the pre-processing are as follows: S1. Decontamination and rust removal: clean the surface of the radiator by soaking it; S2, primary microporous layer: a primary microporous layer is formed on the surface of the radiator by microporous equipment; S3, cleaning and drying: cleaning and drying the radiator with microporous surface to obtain a clean radiator; S4. Anodic treatment: The clean radiator is anodized by anodizing equipment.

[0010] Specifically, the conditions for the first electrophoresis are: voltage (70±10) V, time 2-2.5 min, electrophoresis solution temperature 20-35° C., and electrophoresis solution pH 8-8.5; the conditions for the second electrophoresis are: voltage (70±10) V, time 2-2.5 min, electrophoresis solution temperature 20-35° C., and electrophoresis solution pH 8-8.5; the conditions for the third electrophoresis are: voltage (70±10) V, time 2-2.5 min, electrophoresis solution temperature 20-35° C., and electrophoresis solution pH 8-8.5; The conditions for the first constant temperature dust-free baking are: temperature 170-180°C, time 30-50min; the conditions for the second constant temperature dust-free baking are: temperature 170-180°C, time 30-50min; the conditions for the third constant temperature dust-free baking are: temperature 170-180°C, time 30-50min.

[0011] Specifically, the electroplating conditions are: electroplating voltage is 1.5-2.5V, current density is 2-4A / dm2, electroplating temperature is 20-25°C, electroplating time is 5-10min, and electroplating solution pH value is 8-8.5.

[0012] Specifically, the curing conditions are: temperature 150-180° C., time 20-30 min; the drying conditions are: temperature 80-100° C., time 50-60 min.

[0013] Beneficial effects of the present invention: (1) A low-carbon steel radiator electrophoresis process described in the present invention, the present invention adopts a process flow of pretreatment, electrophoresis, spraying, curing, electroplating and drying to form a protective layer on the surface of the radiator. The protective layer prepared on the surface of the radiator by this process consists of five layers: a primary electrophoretic coating, a secondary electrophoretic coating, a tertiary electrophoretic coating, a thermal conductive coating and an electroplating coating. The radiator adopts three electrophoresis and three baking, and the three electrophoresis uses different electrophoretic liquids to form a dense radiator surface protective layer with excellent adhesion and uniformity. The protective layer has excellent corrosion resistance and wear resistance, which can extend the service life of the radiator. In addition, the process control is precise and the process is easy to promote; (2) The electrophoretic electroplating process for a low-carbon steel radiator described in the present invention adopts two microporous surface roughening treatments in the electrophoretic electroplating process for the radiator. The first microporous layer increases the adhesion between the first electrophoretic coating and the surface of the radiator, and the second microporous layer increases the adhesion between the electroplating coating and the surface of the radiator thermal conductive coating. Thus, the protective layer of the multi-layer structure is firmly attached to the surface of the radiator, and the layers of different properties of the protective layer are firmly attached to each other, and the stability of the protective layer on the surface of the radiator is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0015] Figure 1 A process flow chart of electroplating and electrophoresis for electroplating a low-carbon steel radiator provided by the present invention; Figure 2 An electrophoresis flow chart of an electrophoresis process for electroplating a low-carbon steel radiator provided by the present invention; Figure 3 A pretreatment flow chart of the electroplating electrophoresis process for a low-carbon steel radiator provided by the present invention. DETAILED DESCRIPTION

[0016] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0017] like Figure 1-Figure 3 As shown, a low carbon steel radiator electrophoresis process of the present invention comprises the following steps: Step 1: Pretreatment: Surface pretreatment of the radiator to be electroplated and electrophoresed; Step 2, electrophoresis: placing the pretreated radiator in an electrophoresis solution of an electrophoresis device for electrophoresis treatment to form an electrophoretic coating on the surface of the radiator; Step 3, spraying: spraying a thermal conductive coating on the surface of the electrophoretic coating after electrophoresis of the radiator to form a thermal conductive coating on the surface of the radiator; Step 4, curing: the sprayed radiator is cured by curing equipment to cure the surface thermal conductive coating; Step 5, electroplating: placing the electrophoretically cured radiator in an electroplating solution of an electroplating device for electroplating treatment to form an electroplating coating on the surface of the radiator; Step 6, drying: drying the electroplated radiator through a drying device to dry the surface electroplating coating to obtain a radiator product; Step 7, quality inspection: Conduct electroplating and electrophoresis process inspection on the radiator products; During the radiator pretreatment process, the surface of the radiator is subjected to microporous treatment to form a primary microporous layer; After the thermal conductive coating of the radiator is cured, the surface of the thermal conductive coating of the radiator is subjected to microporous treatment to form a secondary microporous layer.

[0018] Specifically, the specific steps of the electrophoresis are as follows: S1. One-time electrophoresis: placing the pretreated radiator in a No. 1 electrophoresis tank filled with a first-level electrophoresis liquid in an electrophoresis device, performing one-time electrophoresis to form a first-level electrophoresis coating on the surface of the radiator, and then performing one-time constant temperature dust-free baking; S2, secondary electrophoresis: the radiator after the first electrophoresis is placed in the second electrophoresis tank of the electrophoresis equipment filled with the secondary electrophoresis liquid, the secondary electrophoresis forms a secondary electrophoresis coating on the surface of the radiator, and then the radiator is baked at a constant temperature and dust-free for the second time; S3, three-stage electrophoresis: place the radiator after the second electrophoresis in the No. 3 electrophoresis tank of the electrophoresis equipment filled with three-stage electrophoresis liquid, and form a three-stage electrophoresis coating on the surface of the radiator by three-stage electrophoresis, and then bake it at a constant temperature and dust-free for three times.

[0019] Specifically, the first-level electrophoretic liquid adopts water-based acrylic cathode electrophoretic paint, which can quickly and evenly cover the entire surface of the workpiece to form a solid coating; the second-level electrophoretic liquid adopts nanographene electrophoretic paint, and the nanographene in the nanographene electrophoretic paint helps to quickly dissipate the heat inside the protected object, avoiding the decrease of corrosion resistance and aging resistance caused by high temperature; the third-level electrophoretic liquid adopts polyurethane cathode electrophoretic paint, which makes the outer surface of the radiator have better anti-rust ability; The electroplating solution is prepared by mixing nickel sulfate, sodium acetate, sodium borohydride, sodium disulfonate, borax, thiourea, copper sulfate and aminopropionic acid.

[0020] Specifically, the pore roughness of the primary microporous layer formed on the surface of the radiator is 1.0-1.5μm; the pore roughness of the secondary microporous layer formed on the surface of the thermal conductive coating of the radiator is 1.0-1.5μm; the thickness of the primary electrophoretic coating is 10-15μm; the thickness of the secondary electrophoretic coating is 15-20μm; the thickness of the tertiary electrophoretic coating is 10-15μm; the thickness of the thermal conductive coating is: 10-15μm; the thickness of the electroplating coating is 20-25μm.

[0021] Specifically, the specific steps of the pre-processing are as follows: S1. Decontamination and rust removal: clean the surface of the radiator by soaking it; S2, primary microporous layer: a primary microporous layer is formed on the surface of the radiator by microporous equipment; S3, cleaning and drying: cleaning and drying the radiator with microporous surface to obtain a clean radiator; S4. Anodic treatment: The clean radiator is anodized by anodizing equipment.

[0022] Specifically, the conditions for the first electrophoresis are: voltage (70±10) V, time 2-2.5 min, electrophoresis solution temperature 20-35° C., and electrophoresis solution pH 8-8.5; the conditions for the second electrophoresis are: voltage (70±10) V, time 2-2.5 min, electrophoresis solution temperature 20-35° C., and electrophoresis solution pH 8-8.5; the conditions for the third electrophoresis are: voltage (70±10) V, time 2-2.5 min, electrophoresis solution temperature 20-35° C., and electrophoresis solution pH 8-8.5; The conditions for the first constant temperature dust-free baking are: temperature 170-180°C, time 30-50min; the conditions for the second constant temperature dust-free baking are: temperature 170-180°C, time 30-50min; the conditions for the third constant temperature dust-free baking are: temperature 170-180°C, time 30-50min.

[0023] Specifically, the electroplating conditions are: electroplating voltage is 1.5-2.5V, current density is 2-4A / dm2, electroplating temperature is 20-25°C, electroplating time is 5-10min, and electroplating solution pH value is 8-8.5.

[0024] Specifically, the curing conditions are: temperature 150-180° C., time 20-30 min; the drying conditions are: temperature 80-100° C., time 50-60 min.

[0025] When in use, the radiator is soaked to remove dirt and rust from the surface, and then a microporous layer is formed on the surface of the radiator through a microporous device. The radiator with a microporous surface is cleaned and dried to obtain a clean radiator. The clean radiator is anodized through an anodizing device, thereby performing surface pretreatment on the radiator to be electroplated and electrophoresed. The pretreated radiator is placed in a No. 1 electrophoresis tank of the electrophoresis device equipped with a primary electrophoresis liquid, and a primary electrophoresis coating is formed on the surface of the radiator through a primary electrophoresis, and then a constant temperature dust-free baking is performed. The radiator after the primary electrophoresis is placed in a No. 2 electrophoresis tank of the electrophoresis device equipped with a secondary electrophoresis liquid, and the secondary electrophoresis is performed on the radiator. A secondary electrophoretic coating is formed on the surface of the radiator, and then it is baked at a constant temperature and dust-free for a second time. The radiator after the second electrophoresis is placed in the No. 3 electrophoresis tank of the electrophoresis equipment with a tertiary electrophoresis liquid. The tertiary electrophoretic coating is formed on the surface of the radiator by three electrophoresis, and then it is baked at a constant temperature and dust-free for three times. After three electrophoresis and three bakings, an electrophoretic coating composed of a primary electrophoretic coating, a secondary electrophoretic coating and a tertiary electrophoretic coating is formed on the surface of the radiator. A thermal conductive coating is sprayed on the surface of the electrophoretic coating after electrophoresis of the radiator to form a thermal conductive coating on the surface of the radiator. The sprayed radiator is cured by a curing device for the surface thermal conductive coating. After the thermal conductive coating of the radiator is cured, the surface of the thermal conductive coating of the radiator The surface is treated with micropores to form a secondary microporous layer, and then the radiator after electrophoresis curing is placed in the electroplating solution of the electroplating equipment for electroplating treatment, and an electroplating coating is formed on the surface of the radiator. The electroplated radiator is passed through a drying equipment for drying the surface electroplating coating to obtain a radiator product, and finally the radiator product is subjected to electroplating electrophoresis process detection. The present invention adopts a process flow of pretreatment, electrophoresis, spraying, curing, electroplating and drying to form a protective layer on the surface of the radiator. The protective layer prepared on the surface of the radiator by this process consists of five layers: a primary electrophoretic coating, a secondary electrophoretic coating, a tertiary electrophoretic coating, a thermal conductive coating and an electroplating coating. The radiator adopts three Electrophoresis three-time baking, three electrophoresis using different electrophoresis liquids, to form a dense radiator surface protective layer with excellent adhesion and uniformity. The protective layer has excellent corrosion resistance and wear resistance, which can extend the service life of the radiator. The process control is precise and the process promotion is convenient. The radiator electrophoresis electroplating process uses two micro-porous surface roughening treatments. The first micro-porous layer increases the adhesion between the first electrophoretic coating and the radiator surface, and the second micro-porous layer increases the adhesion between the electroplating coating and the radiator thermal conductive coating surface. Therefore, the multi-layer protective layer is firmly attached to the radiator surface, and the layers of different properties of the protective layer are firmly attached, and the radiator surface protective layer has good stability.

[0026] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A low carbon steel radiator electroplating electrophoresis process, characterized in that: The electroplating electrophoresis process includes the following steps: Step 1: Pretreatment: Surface pretreatment of the radiator to be electroplated and electrophoresed; Step 2, electrophoresis: placing the pretreated radiator in an electrophoresis solution of an electrophoresis device for electrophoresis treatment to form an electrophoretic coating on the surface of the radiator; Step 3, spraying: spraying a thermal conductive coating on the surface of the electrophoretic coating after electrophoresis of the radiator to form a thermal conductive coating on the surface of the radiator; Step 4, curing: the sprayed radiator is cured by curing equipment to cure the surface thermal conductive coating; Step 5, electroplating: placing the electrophoretically cured radiator in an electroplating solution of an electroplating device for electroplating treatment to form an electroplating coating on the surface of the radiator; Step 6, drying: drying the electroplated radiator through a drying device to dry the surface electroplating coating to obtain a radiator product; Step 7, quality inspection: Conduct electroplating and electrophoresis process inspection on the radiator products; During the radiator pretreatment process, the surface of the radiator is subjected to microporous treatment to form a primary microporous layer; After the thermal conductive coating of the radiator is cured, the surface of the thermal conductive coating of the radiator is subjected to microporous treatment to form a secondary microporous layer.

2. The electrophoresis plating process for low carbon steel radiator according to claim 1, characterized in that: The specific steps of the electrophoresis are as follows: S1. One-time electrophoresis: placing the pretreated radiator in a No. 1 electrophoresis tank filled with a first-level electrophoresis liquid in an electrophoresis device, performing one-time electrophoresis to form a first-level electrophoresis coating on the surface of the radiator, and then performing one-time constant temperature dust-free baking; S2, secondary electrophoresis: the radiator after the first electrophoresis is placed in the second electrophoresis tank of the electrophoresis equipment filled with the secondary electrophoresis liquid, the secondary electrophoresis forms a secondary electrophoresis coating on the surface of the radiator, and then the radiator is baked at a constant temperature and dust-free for the second time; S3, three-stage electrophoresis: place the radiator after the second electrophoresis in the No. 3 electrophoresis tank of the electrophoresis equipment filled with three-stage electrophoresis liquid, and form a three-stage electrophoresis coating on the surface of the radiator by three-stage electrophoresis, and then bake it at a constant temperature and dust-free for three times.

3. The electrophoresis plating process for low carbon steel radiator according to claim 2 is characterized in that: The first-level electrophoretic liquid adopts water-based acrylic cathode electrophoretic paint; the second-level electrophoretic liquid adopts nanographene electrophoretic paint; the third-level electrophoretic liquid adopts polyurethane cathode electrophoretic paint; The electroplating solution is prepared by mixing nickel sulfate, sodium acetate, sodium borohydride, sodium disulfonate, borax, thiourea, copper sulfate and aminopropionic acid.

4. The electrophoresis plating process for low carbon steel radiator according to claim 2, characterized in that: The pore roughness formed by the primary microporous layer on the surface of the radiator is 1.0-1.5 μm; The pore roughness of the secondary microporous layer formed on the surface of the thermal conductive coating of the radiator is 1.0-1.5 μm; the thickness of the primary electrophoretic coating is 10-15 μm; The thickness of the secondary electrophoretic coating is 15-20 μm; The thickness of the three-level electrophoretic coating is 10-15 μm; the thickness of the thermal conductive coating is 10-15 μm; and the thickness of the electroplating coating is 20-25 μm.

5. The electrophoresis plating process for low carbon steel radiator according to claim 1, characterized in that: The specific steps of the pretreatment are as follows: S1. Decontamination and rust removal: clean the surface of the radiator by soaking it; S2, primary microporous layer: a primary microporous layer is formed on the surface of the radiator by microporous equipment; S3, cleaning and drying: cleaning and drying the radiator with microporous surface to obtain a clean radiator; S4. Anodic treatment: The clean radiator is anodized by anodizing equipment.

6. The electrophoresis plating process for low carbon steel radiator according to claim 2, characterized in that: The conditions for the first electrophoresis are: voltage (70±10) V, time 2-2.5 min, electrophoresis solution temperature 20-35°C, electrophoresis solution pH 8-8.5; the conditions for the second electrophoresis are: voltage (70±10) V, time 2-2.5 min, electrophoresis solution temperature 20-35°C, electrophoresis solution pH 8-8.5; the conditions for the third electrophoresis are: voltage (70±10) V, time 2-2.5 min, electrophoresis solution temperature 20-35°C, electrophoresis solution pH 8-8.5; The conditions for the first constant temperature dust-free baking are: temperature 170-180°C, time 30-50min; the conditions for the second constant temperature dust-free baking are: temperature 170-180°C, time 30-50min; the conditions for the third constant temperature dust-free baking are: temperature 170-180°C, time 30-50min.

7. The electrophoresis plating process for low carbon steel radiator according to claim 1, characterized in that: The electroplating conditions are: electroplating voltage is 1.5-2.5V, current density is 2-4A / dm2, electroplating temperature is 20-25°C, electroplating time is 5-10min, and the pH value of the electroplating solution is 8-8.

5.

8. The electrophoresis plating process for low carbon steel radiator according to claim 1, characterized in that: The curing conditions are: temperature 150-180° C., time 20-30 min; the drying conditions are: temperature 80-100° C., time 50-60 min.

Images