Preparation method of corrosion-resistant hot stamping door ring piece

Abstract

The invention provides a preparation method of a corrosion-resistant hot stamping door ring piece. The preparation method comprises the following steps that a door ring blank is put into a heating furnace to be subjected to hot stamping forming, and a hot stamping part is prepared through laser cutting; the hot stamping part is subjected to pretreatment to remove dirt and oxide skin on the surface; the hot stamping part with the oxide skin removed is subjected to electroplating brush treatment, so that an electric brush plating layer is formed on the surface of the hot stamping part; carrying out bright dipping treatment on the hot stamping part subjected to brush electroplating treatment; and carrying out heating dehydrogenation and oil injection treatment on the hot stamping part subjected to the bright dipping treatment. According to the preparation method of the corrosion-resistant hot stamping door ring piece, the position, with the anti-corrosion requirement, of the lower half portion of the door ring can be treated through brush electroplating treatment, the upper half portion can not be electroplated, the electroplating cost is reduced, local electroplating is achieved, meanwhile, the cost is saved, and the production efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of hot stamping surface treatment, and in particular relates to a method for preparing a corrosion-resistant hot stamping door ring. Background Art

[0002] The description in this section merely provides background information related to the present disclosure and does not constitute prior art.

[0003] At present, the upper part of the automobile body-in-white belongs to the dry area, and the anti-corrosion performance requirements are not good, while the lower part belongs to the wet area, and the anti-corrosion performance is higher. However, the anti-corrosion performance of hot stamping aluminum silicon coating is poor, and the electrogalvanized parts after hot forming, although the anti-corrosion performance is better, it is generally the whole part that is placed in the electroplating tank for electroplating, and local electroplating is not possible, especially for automobile door knocker products, generally the upper part of the body does not require electrogalvanizing, but the lower part of the body needs electrogalvanizing parts. In addition, when the hot-formed parts are rack-plated, the uneven distribution of power lines caused by the shape of the parts during electroplating leads to uneven film thickness of the electroplated film. In order to improve the uniformity of the film thickness, it is necessary to add hangers and auxiliary anodes, which leads to higher electroplating costs.

[0004] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete description of the technical solutions of the present invention and facilitating the understanding of those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because they are described in the background technology section of the present invention. Summary of the invention

[0005] In view of the above problems existing in the prior art, the main purpose of the present invention is to provide a method for preparing a corrosion-resistant hot-stamped door ring, which can realize local electroplating while saving costs and increasing production efficiency.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] The present invention provides a method for preparing a corrosion-resistant hot stamping door ring, comprising the following steps:

[0008] The door ring blank is placed in a heating furnace for hot stamping and laser cutting to prepare a hot stamping part;

[0009] Pre-treating the hot stamping parts to remove dirt and oxide scale on the surface;

[0010] Performing electroplating brush treatment on the hot stamping part after the oxide scale is removed to form a brush plating layer on the surface of the hot stamping part;

[0011] Performing a polishing treatment on the hot stamping parts after the brush plating treatment;

[0012] The hot stamping parts after the light treatment are subjected to heating, dehydrogenation and oil injection treatment.

[0013] Furthermore, in the method for preparing the above-mentioned corrosion-resistant hot-stamped door ring, in the step of "pre-treating the hot-stamped parts to remove dirt and oxide scale on the surface", the hot-stamped parts are shot blasted to remove oxide scale.

[0014] Furthermore, in the method for preparing the above-mentioned corrosion-resistant hot-stamped door ring, in the step of "pre-treating the hot-stamped parts to remove dirt and oxide scale on the surface", the hot-stamped parts are pickled to remove the oxide scale.

[0015] Furthermore, in the preparation method of the above-mentioned corrosion-resistant hot-stamped door ring, in the step of "brushing the hot-stamped part after removing the oxide scale to form a brush-plated layer on the surface of the hot-stamped part", brush plating is performed on all or part of the hot-stamped part, and brush plating is performed on the area that requires electroplating.

[0016] Furthermore, in the method for preparing the above-mentioned corrosion-resistant hot-stamped door ring, in the step of "performing a brush plating treatment on the hot-stamped part after removing the oxide scale to form a brush plating layer on the surface of the hot-stamped part", brush plating layers of different thicknesses are prepared at different positions of the hot-stamped part.

[0017] Furthermore, in the preparation method of the above-mentioned corrosion-resistant hot-stamped door ring, in the step of "subjecting a brush plating treatment to the hot-stamped part after removing the oxide scale to form a brush-plated layer on the surface of the hot-stamped part", the brush-plated layer is a zinc layer, a zinc alloy layer or a zinc-nickel alloy layer.

[0018] Furthermore, in the preparation method of the above-mentioned corrosion-resistant hot-stamped door ring, in the step of "subjecting a brush plating treatment to the hot-stamped part after removing the oxide scale to form a brush-plated layer on the surface of the hot-stamped part", the film thickness of the brush-plated layer ranges from 3μm to 20μm, preferably from 5μm to 15μm.

[0019] Furthermore, in the preparation method of the above-mentioned corrosion-resistant hot-stamped door ring, in the step of "heating and dehydrogenating and oil-spraying the hot-stamped parts after the light-emitting treatment", the heating temperature in the heating and dehydrogenation treatment is 150°C to 230°C, and the time is 30 minutes to 6 hours.

[0020] By means of the above technical solution, the present invention has the following advantages:

[0021] 1. The method for preparing the corrosion-resistant hot stamping door ring of the present invention can treat the lower part of the door ring that has corrosion protection requirements through brush plating, and the upper part does not need to be electroplated, thereby reducing the electroplating cost;

[0022] 2. The method for preparing the corrosion-resistant hot-stamped door ring of the present invention does not require a specific electroplating hanger and an auxiliary anode hanger, thus saving a large amount of hangers and hanging time;

[0023] 3. The preparation method of the corrosion-resistant hot-stamped door ring parts described in the present invention, the brush plating belongs to high-speed electroplating, high production efficiency, short electroplating time and low risk of hydrogen embrittlement. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of a door ring part formed by hot stamping in an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "middle", "lower", "inside", "outside", "front", "back", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following describes an implementation method of the present invention based on its overall structure.

[0027] See also Figure 1 The present invention discloses a method for preparing a corrosion-resistant hot stamping door ring, comprising the following steps:

[0028] The door ring blank is placed in a heating furnace for hot stamping and laser cutting to prepare a hot stamping part;

[0029] Pre-treating the hot stamping parts to remove dirt and oxide scale on the surface;

[0030] Performing electroplating brush treatment on the hot stamping part after the oxide scale is removed to form a brush plating layer on the surface of the hot stamping part;

[0031] Performing a polishing treatment on the hot stamping parts after the brush plating treatment;

[0032] The hot stamping parts after the light treatment are subjected to heating, dehydrogenation and oil injection treatment.

[0033] Specifically, in this embodiment, in the step of "pre-treating the hot stamping parts to remove dirt and oxide scale on the surface", the hot stamping parts are shot blasted to remove the oxide scale.

[0034] Specifically, in this embodiment, in the step of "pre-treating the hot stamping parts to remove dirt and oxide scale on the surface", the hot stamping parts are pickled to remove the oxide scale.

[0035] Specifically, in this embodiment, in the step of "brushing the hot stamped part after the oxide scale is removed to form a brush-plated layer on the surface of the hot stamped part", brush plating is performed on all or part of the hot stamped part, and brush plating is performed on the area that needs to be plated. Brush plating is not performed on the area on the upper part of the door knocker hot stamping part that does not need to be plated, and brush plating is performed on the area on the lower part of the door knocker hot stamping part that needs to be plated.

[0036] Specifically, in this embodiment, in the step of "brushing the hot stamped parts after removing the oxide skin to form a brush-plated layer on the surface of the hot stamped parts", brush-plated layers of different thicknesses are prepared for different positions of the hot stamped parts. For different functional areas, brushing for different times is required. For example, for welding areas (all places in parts that need welding are welding areas), brush plating can be done for 1min to 2min to obtain a zinc layer with a film thickness of 5μm to 10μm; for other areas prone to corrosion, brush plating can be done for 3min to 5min to obtain a zinc layer with a film thickness of 15μm to 20μm.

[0037] Specifically, in this embodiment, in the step of "performing a brush electroplating treatment on the hot stamping part after removing the oxide scale to form a brush-plated layer on the surface of the hot stamping part", the brush-plated layer is a zinc layer, a zinc alloy layer or a zinc-nickel alloy layer. The brush-plated layer can be prepared with different brush plating solutions to form different coatings, such as a zinc-plated layer, a zinc alloy layer, a zinc-nickel alloy and other coatings.

[0038] Specifically, in this embodiment, in the step of "performing a brush plating treatment on the hot stamping part after removing the oxide scale to form a brush plating layer on the surface of the hot stamping part", the film thickness of the brush plating layer ranges from 3μm to 20μm, preferably 5μm to 15μm.

[0039] Specifically, in this embodiment, in the step of "heating and dehydrogenating and spraying the hot stamped parts after the light treatment", the heating temperature in the heating and dehydrogenating treatment is 150°C to 230°C, and the time is 30min to 6h. Brush plating belongs to high-speed galvanizing, the electroplating time is short, the hydrogen content is lower than the normal electroplating process, and the risk of hydrogen embrittlement is low, so only a short tempering and dehydrogenating temperature is required for dehydrogenating.

[0040] The present embodiment is described in detail below through specific embodiments:

[0041] Embodiment 1:

[0042] Firstly, the door knocker blank is placed in a heating furnace for heating and forming, and then laser cut to obtain a hot stamping door knocker part;

[0043] Then the door knocker parts are shot blasted to remove the oxide scale on the surface;

[0044] Then, the door knocker parts are pre-treated by cleaning, degreasing, electrolysis, etc. to obtain a clean surface;

[0045] Then, the lower half of the door knocker part is subjected to brush plating, wherein the moving speed of the plating brush is 300 mm / s, and brush plating pens of different shapes are allocated according to different positions of the door knocker part. For the welding position, the brush plating is performed for 2 minutes to obtain a zinc plating film with a thickness of 10 μm, and the other positions are subjected to brush plating for 3 minutes to obtain a zinc plating film with a thickness of 15 μm.

[0046] Finally, the door knocker parts that have been brush plated are polished with 0.1% nitric acid solution.

[0047] Embodiment 2:

[0048] Firstly, the door knocker blank is placed in a heating furnace for heating and forming, and then laser cut to obtain a hot stamping door knocker part;

[0049] Then the door knocker parts are pickled to remove the oxide scale on the surface;

[0050] Then, the door knocker parts are pre-treated by cleaning, degreasing, electrolysis, etc. to obtain a clean surface;

[0051] Then, the lower half of the door knocker part is subjected to brush plating, wherein the moving speed of the plating brush is 200 mm / s, and brush plating pens of different shapes are allocated according to different positions of the door knocker part. For the welding position, the brush plating is performed for 2 minutes to obtain a zinc plating film with a thickness of 10 μm, and the other positions are subjected to brush plating for 3 minutes to obtain a zinc plating film with a thickness of 15 μm.

[0052] Finally, the door knocker parts that have been brush plated are polished with 0.1% nitric acid solution.

[0053] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any changes, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a corrosion-resistant hot stamping door ring, characterized in that: The following steps are involved: The door ring blank is placed in a heating furnace for hot stamping and laser cutting to prepare a hot stamping part; Pre-treating the hot stamping parts to remove dirt and oxide scale on the surface; Performing electroplating brush treatment on the hot stamping part after the oxide scale is removed to form a brush plating layer on the surface of the hot stamping part; Performing a polishing treatment on the hot stamping parts after the brush plating treatment; The hot stamping parts after the light treatment are subjected to heating, dehydrogenation and oil injection treatment.

2. The method for preparing the corrosion-resistant hot stamping door ring according to claim 1, characterized in that: In the step of "pre-treating the hot stamping parts to remove dirt and oxide scale on the surface", the hot stamping parts are shot blasted to remove oxide scale.

3. The method for preparing the corrosion-resistant hot stamping door ring according to claim 1, characterized in that: In the step of "pre-treating the hot stamping parts to remove dirt and oxide scale on the surface", the hot stamping parts are pickled to remove the oxide scale.

4. The method for preparing the corrosion-resistant hot stamping door ring according to claim 1, characterized in that: In the step of "performing a brush electroplating treatment on the hot stamping part after the oxide scale is removed to form a brush plating layer on the surface of the hot stamping part", the brush plating treatment is performed on all or part of the hot stamping part, and the brush plating treatment is performed on the area requiring the electroplating treatment.

5. The method for preparing the corrosion-resistant hot stamping door ring according to claim 1, characterized in that: In the step of "performing a brush electroplating treatment on the hot stamping part after the oxide scale is removed to form a brush plating layer on the surface of the hot stamping part", brush plating layers of different thicknesses are prepared at different positions of the hot stamping part.

6. The method for preparing a corrosion-resistant hot stamping door ring according to claim 1, characterized in that: In the step of "performing a brush electroplating treatment on the hot stamping part after removing the oxide skin to form a brush plating layer on the surface of the hot stamping part", the brush plating layer is a zinc layer, a zinc alloy layer or a zinc-nickel alloy layer.

7. The method for preparing a corrosion-resistant hot stamping door ring according to claim 1, characterized in that: In the step of "performing a brush electroplating treatment on the hot stamping part after removing the oxide skin to form a brush plating layer on the surface of the hot stamping part", the film thickness of the brush plating layer ranges from 3μm to 20μm, preferably from 5μm to 15μm.

8. The method for preparing a corrosion-resistant hot stamping door ring according to claim 1, characterized in that: In the step of "heating and dehydrogenating and oil-spraying the hot stamped parts after the light-emitting treatment", the heating temperature in the heating and dehydrogenating treatment is 150° C. to 230° C., and the time is 30 minutes to 6 hours.

Images