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A kind of method for coating zinc-nickel double passivation film on the surface of steel structure

A passivation film and steel structure technology, applied in the field of metal surface treatment, to achieve the effects of simplifying the process, improving corrosion resistance, and improving efficiency

Active Publication Date: 2017-12-22
CHANGSHU FENGFAN POWER EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A single passivated galvanized layer can protect the corrosion resistance, acid resistance, and oxidation resistance of the plated parts to a certain extent, but as the industry's requirements for corrosion resistance increase, a single passivated coating can no longer meet the needs of the industry and the market. Require

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for coating the surface of a steel structure with a zinc-nickel double-layer passivation film, the specific steps are as follows:

[0022] (1) Pre-treatment: After decontamination and cleaning the surface of the steel parts, a layer of rust remover is evenly coated on the surface, so that the rust on the steel parts and the rust remover react to form inert substances. On the one hand, it can prevent rust The existence of the iron and steel parts will be corroded and damaged in the metal film; on the other hand, after the derusting treatment, the iron and steel parts will be exposed, which is convenient for the stability of the nickel layer;

[0023] The formula of the rust remover is: 80 parts of water, 3 parts of phosphate buffer, 15 parts of tannic acid, 3 parts of wetting agent, 8 parts of isopropanol, 0.5 part of dispersant, and 1 part of leveling agent;

[0024] (2) Hot-dip galvanizing: Rinse the steel after derusting in step (1) with distilled water, preh...

Embodiment 2

[0032] A method for coating the surface of a steel structure with a zinc-nickel double-layer passivation film, the specific steps are as follows:

[0033] (1) Pre-treatment: After decontamination and cleaning the surface of the steel parts, a layer of rust remover is evenly coated on the surface, so that the rust on the steel parts and the rust remover react to form inert substances. On the one hand, it can prevent rust The existence of the iron and steel parts will be corroded and damaged in the metal film; on the other hand, after the derusting treatment, the iron and steel parts will be exposed, which is convenient for the stability of the nickel layer;

[0034] The formula of the rust remover is: 80 parts of water, 3 parts of phosphate buffer, 15 parts of tannic acid, 3 parts of wetting agent, 8 parts of isopropanol, 0.5 part of dispersant, and 1 part of leveling agent;

[0035] (2) Hot-dip galvanizing: Rinse the rust-removed steel in step (1) with distilled water, preheat...

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PUM

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Abstract

The invention discloses a method for plating the surface of a steel structure with a zinc-nickel double-layer passive film. The method includes the first step of pretreatment, the second step of hot galvanizing, the third step of cooling, the fourth step of chemical nickel plating and passivating and the fifth step of drying forming. According to the method for plating the surface of the steel structure with the zinc-nickel double-layer passive film, through the reasonable process design, the surface of steel is sequentially plated with the zinc-nickel double-layer passive film, chemical nickel plating and passivating are synchronously conducted, and therefore the process is simplified, efficiency is improved, thorough passivating is conducted on the whole nickel layer, and the passivating effect is effectively improved. By means of the prepared double-layer metal passive layer, the corrosion resistance and the acid resistance of steel are effectively improved, and the service life of steel is effectively prolonged.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a method for coating the surface of a steel structure with a zinc-nickel double-layer passivation film. Background technique [0002] The technology of applying surface coating can greatly improve the corrosion resistance of materials. Existing steel or metal surfaces are usually protected by electroplating metal zinc and passivation solution treatment. A single passivated galvanized layer can protect the corrosion resistance, acid resistance, and oxidation resistance of the plated parts to a certain extent, but as the industry's requirements for corrosion resistance increase, a single passivated coating can no longer meet the needs of the industry and the market. Require. Contents of the invention [0003] The technical problem mainly solved by the invention is to provide a method for coating the surface of a steel structure with a zinc-nickel double-layer pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/06C23C18/32C23G1/08C23C22/42C23C28/02
CPCC23C2/06C23C18/32C23C22/42C23C28/021C23G1/088
Inventor 赵月华秦磊
Owner CHANGSHU FENGFAN POWER EQUIP