CN205347570U - Compound coating material of high corrosion resisting steel base surface - Google Patents

Abstract

The utility model relates to a composite coating material, in particular to a high-corrosion-resistant steel base surface composite coating material. Including the carbon steel substrate and the electroless composite coating on the surface of the carbon steel substrate, the structure of the electroless composite coating on the surface of the carbon steel substrate is as follows from the inside to the outside: Ni-P coating, Ni-P-nano SiO ₂ coating, Ni-Zn- P coating and Ni-P coating. Wherein the Ni-P coating has excellent corrosion resistance; due to the addition of nano- _SiO2 , the Ni-P-nano- _SiO2 coating can significantly improve the hardness of the Ni-P coating; the Zn in the ternary alloy coating Ni-Zn-P coating Addition can obviously improve the corrosion resistance, Zn is preferential to corrosion of Ni and carbon steel matrix when corrosion occurs, and protects the matrix material. Therefore, the utility model improves the corrosion resistance and wear resistance of the carbon steel, and expands the application range of the carbon steel, especially in harsh corrosion environments such as industry and ocean.

Description

Composite coating material for steel base surface with high corrosion resistance

technical field

The utility model relates to a composite coating material, in particular to a high-corrosion-resistant steel base surface composite coating material.

Background technique

Composite coating technology is one of the effective ways to improve the surface properties of materials, and composite coating technology has the advantages of simple process, low cost, can be operated at room temperature, and does not affect the internal properties of the main material, so it plays an important role in the research and development of materials. status. The failure of steel materials mostly occurs on the surface of the material. For example, the fatigue, corrosion and wear of the material are extremely sensitive to the surface structure and properties of the material. The structure and properties of the material surface directly affect the overall performance of the steel material. As a means of strengthening the surface of materials, composite plating technology has attracted much attention because of its high hardness, wear resistance, self-lubrication, corrosion resistance, special decorative appearance, electrical contact, and electrocatalysis. .

The electroless Ni-P binary alloy coating has good uniformity, hardness, wear resistance, corrosion resistance and other comprehensive physical and chemical properties, and has been widely used in materials, machinery, chemical and other industrial fields. However, with the development of science and technology and the rapid advancement of modern industry, the performance of Ni-P binary alloy coating can no longer meet the growing needs of various industries for materials, so a third metal is added on the basis of binary alloy coating Composition, that is, a ternary alloy based on Ni-P is obtained, and its electrical conductivity, corrosion resistance, heat resistance, wear resistance and other properties are more enhanced than its binary alloy. Adding an appropriate amount of zinc salt (zinc sulfate, zinc chloride) to the electroless Ni–P alloy plating solution can obtain a Ni-Zn-P ternary alloy coating, which can be used for various applications with high corrosion resistance requirements and complex shapes. Compared with binary alloys, its conductivity, magnetism, wear resistance, heat resistance, corrosion resistance and other properties have been greatly improved.

The development of nanomaterials science has brought new opportunities for the development of composite coatings. The nanocomposite coating is prepared by adding nanoparticles into the electroless plating solution, which has more diversified uses and has a good application prospect. As the second phase particles, nanoparticles have a strengthening effect on the coating, and the finer the particles, the stronger the strengthening effect. The nano-scale solid particles are coated in the Ni-P alloy coating by the chemical deposition method. Due to the pinning effect of the nanoparticles on dislocations and grain boundaries, the high-temperature growth of the grains can be inhibited. Thermal stability, wear resistance and hardness can be further improved.

Therefore, it is important to improve the surface properties of steel materials, obtain steel-based surface composite coating materials with high corrosion resistance, high wear resistance and high hardness, and expand its application range, especially in harsh corrosive environments such as industry and ocean.

Utility model content

The purpose of the utility model is to provide a steel base surface composite coating material with high corrosion resistance, high wear resistance and high hardness, which expands the application range of carbon steel, especially in harsh corrosion environments such as industry and ocean.

In order to achieve the above object, the technical solution adopted by the utility model is:

A high-corrosion-resistant steel-based composite coating material, including a carbon steel substrate and an electroless composite coating on the surface of the carbon steel substrate. The structure of the electroless composite coating on the surface of the carbon steel substrate is as follows from inside to outside: Ni-P coating, Ni-P-nano _SiO2 coating, Ni-Zn-P coating and Ni-P coating.

Adopt the utility model of above-mentioned technical scheme, compared with prior art, its advantage and beneficial effect are:

Ni-P coating is a coating with excellent anti-corrosion performance; Ni-P-nano-SiO ₂ coating next to Ni-P coating, due to the addition of nano-SiO ₂ , significantly improves the hardness of Ni-P coating and increases wear resistance; ternary The addition of Zn in the Ni-Zn-P coating of the alloy coating acts as a sacrificial anode. When corrosion occurs, Zn corrodes prior to Ni and the carbon steel substrate, protecting the Ni-P coating and the substrate material. The composite coating adopts the sequence of Ni-P coating, Ni-P-nanometer _SiO2 coating, Ni-Zn-P coating and Ni-P coating, and the outer Ni-P coating and Ni-Zn-P coating have high corrosion resistance, The middle Ni-P-nanometer SiO ₂ coating has the advantages of high hardness, wear resistance and corrosion resistance, and the inner Ni-P coating plays the role of high bonding strength and corrosion resistance with the steel base. Therefore, the utility model provides a steel base surface composite coating material with high corrosion resistance, high wear resistance and high hardness, which expands the application range of carbon steel, especially in harsh corrosion environments such as industry and ocean.

As preferably, the further technical scheme of the utility model is:

The Ni-P coating has two layers, one is located on the surface of the carbon steel substrate, and the other is located on the outermost layer, next to the Ni-Zn-P coating.

The thickness of the inner layer and the outermost Ni-P coating is 5-10 μm.

The thickness of the Ni-P-nanometer SiO ₂ coating is 10-20 μm.

The thickness of the Ni-Zn-P coating is 10-20 μm.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment;

In the figure: 1-carbon steel substrate; 2-inner Ni-P coating; 3-Ni-P-nanometer SiO ₂ coating; 4-Ni-Zn-P coating, 5-outer Ni-P coating.

detailed description

The utility model is further elaborated below in conjunction with the embodiment that accompanying drawing provides, but embodiment does not constitute any limitation to the utility model.

Referring to Fig. 1, a high-corrosion-resistant steel-based composite coating material is composed of a carbon steel substrate 1 and a composite coating on the surface of the carbon steel substrate 1. The carbon steel substrate 1 is selected from Q235 low-carbon steel, and its size is 20×25×0.9 mm ³ ; the composite coating structure from inside to outside is as follows: inner Ni-P coating 2, Ni-P-nano SiO ₂ coating 3, Ni-Zn-P coating 4, outer Ni-P coating 5; inner and outer Ni- The P coating 2 is located on the surface of the carbon steel substrate 1 , and the outer Ni-P coating 5 is adjacent to the Ni-Zn-P coating 4 .

In this embodiment, the inner Ni-P coating 2 is 5-10 μm, the Ni-P-nanometer SiO ₂ coating 3 is 10-20 μm, the Ni-Zn-P coating 4 is 10-20 μm, and the outer Ni-P coating 5 The total thickness of the composite coating is 30-50 μm; the hardness of the coating is 600-800HV, and the salt spray resistance test time exceeds 180 hours.

The above descriptions are only preferred and feasible embodiments of the present utility model, and are not intended to limit the scope of rights of the present utility model. within the scope of rights.

Claims (4)

1. A high corrosion-resistant steel substrate surface composite coating material, comprising a carbon steel substrate and an electroless composite coating on the carbon steel substrate surface, is characterized in that: the electroless composite coating structure on the carbon steel substrate surface is sequentially from inside to outside : Ni-P coating, Ni-P-nano SiO ₂ coating, Ni-Zn-P coating and Ni-P coating. 2. The highly corrosion-resistant steel-based surface composite coating material according to claim 1, characterized in that: the thickness of the Ni-P coating is respectively 5-10 μm. 3. The high-corrosion-resistant steel-based surface composite coating material according to claim 1, characterized in that: the thickness of the Ni-P-nanometer SiO ₂ coating is 10-20 μm. 4. The highly corrosion-resistant steel-based surface composite coating material according to claim 1, characterized in that: the thickness of the Ni-Zn-P coating is 10-20 μm.