Cyanide-free alkaline zinc plating composite layer for automobile parts

Abstract

The utility model discloses a cyanide-free alkaline zinc-plating composite layer for automobile parts, which relates to the technical field of metal electroplating, and comprises a substrate and a zinc phosphate coating arranged on the upper side of the substrate, a cyanide-free alkaline zinc-plating bright layer is arranged above the zinc phosphate coating, an electrophoretic paint layer is arranged on the upper surface of the cyanide-free alkaline zinc-plating bright layer, and the electrophoretic paint layer is arranged on the lower surface of the cyanide-free alkaline zinc-plating bright layer. A primer layer is arranged on the upper surface of the electrophoretic paint, a colored layer is arranged on the upper surface of the primer layer, a varnish layer is arranged on the upper surface of the colored layer, and a paint isolation layer is painted between the zinc phosphate coating and the cyanide-free alkaline zinc plating bright layer. Compared with the existing common cyanide-free alkaline zinc-plating composite layer for the automobile spare parts, the cyanide-free alkaline zinc-plating composite layer for the automobile spare parts has the advantages that the mode of mixing the zinc phosphate coating and the cyanide-free alkaline zinc-plating bright layer is utilized; the composite layer has the characteristic that a zinc phosphate coating can bear severe environment conditions and also has the characteristic of a cyanide-free alkaline zinc plating bright layer.

Description

Technical Field

[0001] The utility model relates to the technical field of metal electroplating, in particular to a cyanide-free alkaline zinc plating composite layer for automobile accessories. Background Art

[0002] With the popularity of automobiles in China, people have higher and higher requirements for the quality of auto parts. At present, most of the parts used in a car are made of steel. In order to extend the life of the car, it is very important to treat the surface of the steel used in the car to enhance its corrosion resistance, thermal shock resistance and aesthetics. The surface coating of existing auto parts is mostly sprayed with a mixture of zinc phosphate coating and ordinary electrophoretic paint, resulting in poor throwing power and deep plating ability.

[0003] Therefore, in view of this, the existing structural deficiencies are studied and improved, and a cyanide-free alkaline zinc-plated composite layer for automotive parts is proposed. Utility Model Content

[0004] The utility model aims to provide a cyanide-free alkaline zinc-plating composite layer for automobile parts to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a cyanide-free alkaline zinc-plated composite layer for automobile accessories, comprising a substrate and a zinc phosphate coating arranged on the upper side of the substrate, a cyanide-free alkaline zinc-plated bright layer is arranged above the zinc phosphate coating, an electrophoretic paint layer is arranged on the upper surface of the cyanide-free alkaline zinc-plated bright layer, a primer layer is arranged on the upper surface of the electrophoretic paint layer, a colored layer is arranged on the upper surface of the primer layer, a varnish layer is arranged on the upper surface of the colored layer, and an isolation paint layer is applied between the zinc phosphate coating and the cyanide-free alkaline zinc-plated bright layer.

[0006] Preferably, the spraying thickness of the zinc phosphate coating and the cyanide-free alkaline zinc plating bright layer is between 1 and 2 microns.

[0007] Preferably, the thickness of the electrophoretic paint layer is between 15 and 20 microns, and the electrophoretic paint layer is mainly an epoxy electrophoretic paint layer.

[0008] Preferably, the thickness of the primer layer is between 35-45 microns, and the primer layer is a polyphenol oxygen pre-coating primer.

[0009] Preferably, the thickness of the colored layer is between 10 and 25 micrometers, and the colored layer can be mixed with spray paints of various colors.

[0010] Preferably, the thickness of the varnish layer is between 40 and 50 microns, and the spraying thickness of the varnish layer is 5 to 10 microns thicker than conventional thickness, which can improve the scratch resistance.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. The utility model provides a zinc phosphate coating, a cyanide-free alkaline zinc plating bright layer, an electrophoretic paint layer, and a paint barrier layer, and mixes the zinc phosphate coating and the cyanide-free alkaline zinc plating bright layer. The zinc phosphate coating has the characteristics of withstanding harsh environmental conditions while also having the characteristics of a cyanide-free alkaline zinc plating bright layer. The cyanide-free alkaline zinc plating bright layer has better even plating ability, and is more even than the acid zinc plating mixed coating, with a smaller thickness difference and better deep plating ability. Compared with the acid zinc plating, the mixed layer has a stable deep plating ability and a high tolerance to impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of a partially cutaway three-dimensional structure of the utility model;

[0014] Figure 2 Utility Model Figure 1 A is an enlarged structural diagram of the middle part.

[0015] In the figure: 1. substrate; 2. zinc phosphate coating; 3. cyanide-free alkaline zinc plating bright layer; 4. electrophoretic paint layer; 5. primer layer; 6. colored layer; 7. varnish layer; 8. paint barrier layer. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] like Figure 1-Figure 2As shown, a cyanide-free alkaline zinc plating composite layer for automobile parts comprises a substrate 1 and a zinc phosphate coating 2 arranged on the upper side of the substrate 1, a cyanide-free alkaline zinc plating bright layer 3 is arranged above the zinc phosphate coating 2, an electrophoretic paint layer 4 is arranged on the upper surface of the cyanide-free alkaline zinc plating bright layer 3, a primer layer 5 is arranged on the upper surface of the electrophoretic paint layer 4, a color layer 6 is arranged on the upper surface of the primer layer 5, a varnish layer 7 is arranged on the upper surface of the color layer 6, an isolation paint layer 8 is applied between the zinc phosphate coating 2 and the cyanide-free alkaline zinc plating bright layer 3, and the cyanide-free alkaline zinc plating bright layer 3 is made of a varnish layer. During the process, add 1 / 3 of the prepared solution of water into the tank, add sodium hydroxide solid carefully, not too fast, pay attention to heat release, stir and dissolve, add zinc oxide while hot and stir until completely dissolved, wait for the plating solution to cool, add water to a predetermined volume, finally add the above additives, and then you can start trial plating. The mixture of zinc phosphate coating 2 and cyanide-free alkaline zinc plating bright layer 3 has the characteristics of zinc phosphate coating 2 that can withstand harsh environmental conditions and also has the characteristics of cyanide-free alkaline zinc plating bright layer 3. The paint barrier layer 8 can be replaced by electrophoretic paint.

[0018] like Figure 1-2 As shown, the spraying thickness of the zinc phosphate coating 2 and the cyanide-free alkaline zinc plating bright layer 3 is between 1-2 microns, the thickness of the electrophoretic paint layer 4 is between 15-20 microns, and the electrophoretic paint layer 4 is mainly an epoxy electrophoretic paint layer. The epoxy electrophoretic paint has super salt spray performance and deep hole penetration. The epoxy electrophoretic paint can better cover the substrate and prevent the primer from rotting. The thickness of the primer layer 5 is between 35-45 microns, and the primer layer 5 is a polyphenol oxygen pre-coating primer. The thickness of the colored layer 6 is between 10-25 microns, and the colored layer 6 can be mixed with spray pigments of various colors. The thickness of the varnish layer 7 is between 40-50 microns, and the spraying thickness of the varnish layer 7 is 5-10 microns more than the conventional thickness, which can improve the scratch resistance.

[0019] Working principle: When using the cyanide-free alkaline zinc-plated composite layer for automotive accessories, first, through the mixed spraying of zinc phosphate coating 2, cyanide-free alkaline zinc-plated bright layer 3, and paint isolation layer 8, compared with single acid zinc plating, the mixed coating is more uniform, with small thickness difference and better deep plating ability. Compared with acid zinc plating, the mixed layer has stable deep plating ability and high impurity tolerance. During the preparation of the cyanide-free alkaline zinc-plated bright layer 3, add 1 / 3 of the prepared solution of water to the tank. When adding sodium hydroxide solid, be careful not to add it too quickly, pay attention to heat release, and stir to dissolve. In this process, add zinc oxide while hot and stir until completely dissolved. After the plating solution is cooled, add water to the predetermined volume. Finally, add the above various additives, and then you can start trial plating. This is the working principle of the cyanide-free alkaline zinc-plated composite layer for automotive accessories.

Claims

1. A cyanide-free alkaline zinc-plated composite layer for automobile parts, comprising a substrate (1) and a zinc phosphate coating (2) arranged on the upper side of the substrate (1), characterized in that: A cyanide-free alkaline zinc plating bright layer (3) is arranged above the zinc phosphate coating (2), an electrophoretic paint layer (4) is arranged on the upper surface of the cyanide-free alkaline zinc plating bright layer (3), a primer layer (5) is arranged on the upper surface of the electrophoretic paint layer (4), a colored layer (6) is arranged on the upper surface of the primer layer (5), a varnish layer (7) is arranged on the upper surface of the colored layer (6), and an isolation paint layer (8) is applied between the zinc phosphate coating (2) and the cyanide-free alkaline zinc plating bright layer (3).

2. The cyanide-free alkaline zinc-plating composite layer for automobile parts according to claim 1, characterized in that: The spraying thickness of the zinc phosphate coating (2) and the cyanide-free alkaline zinc plating bright layer (3) is between 1 and 2 micrometers.

3. The cyanide-free alkaline zinc-plating composite layer for automobile parts according to claim 1, characterized in that: The thickness of the electrophoretic paint layer (4) is between 15 and 20 micrometers, and the electrophoretic paint layer (4) is mainly an epoxy electrophoretic paint layer.

4. The cyanide-free alkaline zinc plating composite layer for automobile parts according to claim 1, characterized in that: The thickness of the primer layer (5) is between 35 and 45 micrometers, and the primer layer (5) is a polyphenol oxygen pre-coating primer.

5. The cyanide-free alkaline zinc plating composite layer for automobile parts according to claim 1, characterized in that: The thickness of the colored layer (6) is between 10 and 25 micrometers, and the colored layer (6) can be mixed with spray paints of various colors.

6. The cyanide-free alkaline zinc plating composite layer for automobile parts according to claim 1, characterized in that: The thickness of the varnish layer (7) is between 40 and 50 micrometers, and the spraying thickness of the varnish layer (7) is 5 to 10 micrometers thicker than conventional thickness, thereby improving the scratch resistance.

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