Corrosion-resistant coating structure for steel strut of railway overhead line system

Abstract

The utility model relates to the technical field of anticorrosive coatings, and discloses an anticorrosive coating structure for a steel strut of a railway contact net, which comprises a primer layer and a finish paint layer which are sequentially laminated and coated on the surface of a base body from inside to outside, the primer layer is low surface treatment epoxy primer, and the finish paint layer is self-healing polysiloxane finish paint. The anti-corrosion coating structure has low requirements on substrate surface treatment, the whole coating has good anti-corrosion and anti-aging performance, high-performance anti-corrosion protection is achieved, the protection effect is longer, and the anti-corrosion requirement of railway facilities is better met.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of anticorrosive coating, specifically relates to a railway overhead line system steel pillar anticorrosive coating structure. BACKGROUND

[0002] With the continuous expansion and renovation of railway transportation, the demand for corrosion protection of railway facilities is also increasing. As important infrastructure, railway overhead line system steel pillars and the like will face problems such as corrosion and aging during use, and therefore need to be subjected to anticorrosive treatment.

[0003] Anticorrosive coating plays an important role in the corrosion protection of railway overhead line system steel pillars as a main anticorrosive means. The anticorrosive coating structure generally mainly includes a primer layer, an intermediate layer and a topcoat layer. However, the surface of the existing anticorrosive coating structure needs to be subjected to sand blasting treatment or shot blasting rust removal to achieve a Sa2.5 level or above, and the weather resistance and aging resistance of the coating are insufficient, and therefore an anticorrosive coating structure with better anticorrosive performance and longer protection effect is needed to better meet the anticorrosive demand of railway facilities. SUMMARY

[0004] The utility model aims at the above problems, provides a railway overhead line system steel pillar anticorrosive coating structure, the surface treatment requirement of base material is low, the whole coating has good anticorrosive and anti-aging performance, realizes high-performance anticorrosive protection, and the protection effect is longer.

[0005] In order to realize the above-mentioned purpose, the utility model adopts the technical scheme as follows: a railway overhead line system steel pillar anticorrosive coating structure includes a primer layer and a topcoat layer which are sequentially coated on the surface of a base material from inside to outside, the primer layer is a low-surface treatment epoxy primer, and the topcoat layer is a self-healing polysiloxane topcoat.

[0006] Preferably, the low-surface treatment epoxy primer is a permeable graphene-modified epoxy primer.

[0007] Preferably, the dry film thickness of the primer layer is 100-120 mu m.

[0008] Preferably, the dry film thickness of the topcoat layer is 100-150 mu m.

[0009] Due to the adoption of the above technical scheme, the utility model has the following beneficial effects:

[0010] The utility model adopts a low-surface treatment epoxy primer and a self-healing polysiloxane topcoat, the primer layer is a low-surface treatment paint, the surface treatment requirement of the base material is low, a large amount of surface treatment cost can be saved, the topcoat layer has a self-healing function, excellent anti-external damage capacity, outstanding ultraviolet resistance, and excellent flexibility and impact resistance, high-performance anticorrosive protection is realized, and the long-acting anticorrosive performance is better. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 A structural diagram of a railway contact net steel pillar anticorrosive coating structure according to the present application;

[0012] In the figure: 1 - primer layer, 2 - topcoat layer. DETAILED DESCRIPTION

[0013] For those skilled in the art, the technical solutions in the embodiments of the present application will be better understood in the following description of the embodiments of the present application with reference to the accompanying drawings. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. The description of the present application and the claims and the above drawings constitute a specification for a patent application. The terms "first", "second", and the like, used in the description and the claims of the present application and the above drawings, are used to distinguish different objects and are not intended to describe a particular sequential order. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover not exclusively containing. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but can optionally further comprise steps or units not listed, or can optionally further comprise other steps or units inherent to the process, method, product or device.

[0014] In this document, reference to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiment, or to a single alternative embodiment. It is explicitly contemplated that embodiments described herein can be combined with each other.

[0015] As Figure 1As shown, a railway catenary steel pillar anticorrosion coating structure comprises a primer layer 1 and a topcoat layer 2 successively coated on the surface of a substrate from inside to outside, the primer layer 1 is a low-surface treatment epoxy primer, and the topcoat layer 2 is a self-healing polysiloxane topcoat. The coating method can be spraying, rolling, brushing and the like. The primer layer 1 is two coats, and the topcoat layer 2 is two coats. The primer is a low-surface treatment paint, which has low requirements for surface treatment of the substrate, can save a large amount of surface treatment cost, and only needs to remove rust from the surface of the substrate to loose rust without rusting to the surface cleanliness of Sa2.5 level, and can be painted with rust. The topcoat has a self-healing function, excellent resistance to external force damage, outstanding ultraviolet resistance, and excellent flexibility and impact resistance, realizing high-performance corrosion protection. The primer and the topcoat are both high-solid coatings with low VOC content and no heavy metals, which are more environmentally friendly.

[0016] Rust is a loose and porous water-containing solid, and its outer layer is loose rust which is not firmly attached to the substrate, and its inner layer is firm rust which is tightly combined with the substrate. Therefore, in addition to the performance of general rust-proof paint, low-surface treatment paint must have two special conditions, one is that the low-surface treatment paint must have sufficient penetration ability to the rust layer, that is, it can fully soak and penetrate the loose and porous rust layer, so that the iron rust is bonded to form a continuous and closed coating to seal the entire rust layer and the steel surface; the second is that the low-surface treatment paint must have sufficient reactivity to the rust layer, that is, the active and harmful iron compounds in the rust layer can be passivated and converted into stable and harmless fillers. Therefore, the basic principle of low-surface treatment paint is to use a resin with good penetration as a base material, and with the help of penetrants and polar solvents, the paint has good penetration, thereby soaking and penetrating the rust layer and sealing it. This type of paint can be generally divided into four categories: penetration type, stabilization type, conversion type and functional type low-surface treatment paint.

[0017] Preferably, the low-surface treatment epoxy primer is a penetration type graphene modified epoxy primer. The dry film thickness of the primer layer 1 is 100-120 μm. The primer layer 1 is a penetration type graphene modified epoxy primer, and the penetration type graphene modified epoxy zinc-rich primer uses epoxy resin as the paint base, and with the help of penetrants and polar solvents, the paint has good penetration, thereby soaking and penetrating the rust layer on the surface of the steel and sealing the rust layer. Graphene is a two-dimensional material with good electrical conductivity, high specific surface area and high mechanical strength. Due to its large specific surface area, it can form an effective isolation layer to prevent or delay the diffusion of corrosion medium to the metal surface. Moreover, due to its good electrical conductivity, when the metal surface is damaged, it can quickly transfer electrons, allowing the metal surface cations to continuously accumulate, thereby inhibiting the occurrence of electrochemical phenomena, delaying corrosion, and significantly improving the corrosion protection performance of the coating.

[0018] Preferably, the dry film thickness of the topcoat layer 2 is 100-150 μm. The topcoat layer 2 is a self-healing polysiloxane topcoat, which can also be called a self-repairing polysiloxane coating, and is a coating with special properties, which is mainly composed of a hydroxyl-containing polysiloxane resin, an aliphatic isocyanate curing agent, a high-grade pigment, an additive, a solvent and the like. Its self-healing property is that when the coating is damaged by external force, such as scratching, abrasion and the like, it can automatically repair the damaged part and restore the integrity and protective performance of the coating by virtue of its good elasticity, thereby prolonging the service life of the coating. Since the resin base material itself contains polar groups such as hydroxyl groups, it can be firmly combined with various primers and substrates, has good adhesion and is not easy to peel off, thereby ensuring the stability of the coating system; the polysiloxane resin has a high bond energy and good main chain flexibility, the coating has super strong anti-aging performance and excellent impact resistance and flexibility, and can still maintain bright color and high gloss and has better long-acting corrosion resistance after long-term exposure to outdoor environment.

[0019] The above has made a detailed description of the utility model in general, but on the basis of the utility model, some modifications or improvements can be made, which is obvious to those skilled in the art. Therefore, the modifications or improvements without departing from the spirit of the utility model are within the protection scope of the utility model.

Claims

1. A railway overhead line steel pole anticorrosion coating structure, characterized in that: The primer layer and the topcoat layer are sequentially stacked from inside to outside on the surface of the substrate, the primer layer is a low-surface treatment epoxy primer, and the topcoat layer is a self-healing polysiloxane topcoat.

2. The railway overhead line steel pole anticorrosive coating structure according to claim 1, characterized in that: The dry film thickness of the primer layer is 100-120 μm.

3. The railway overhead line steel pole anticorrosive coating structure according to claim 1, characterized in that: The dry film thickness of the topcoat layer is 100-150 μm.

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