Adjusting method for passivation temperature of steel structure

A technology of passivation temperature and adjustment method, applied in the direction of metal material coating process, etc., can solve the problem that the influence of passivation effect is rarely studied, and achieve the effect of improving adhesion stability, reducing porosity and improving passivation quality.

Active Publication Date: 2016-03-02
CHANGSHU FENGFAN POWER EQUIP
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AI Technical Summary

Problems solved by technology

Existing passivation methods mainly focus on the influence of the passivation solution formula on the passivation effect, but there are few studies on the influence of the temperature conditions in the passivation process on the passivation effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for adjusting the passivation temperature of a steel structure, the specific steps are as follows:

[0022] (1) Drying and cooling of hot-dip galvanized steel sheets: Dry the hot-dip galvanized steel sheets with nitrogen at a temperature of 60-70°C and a pressure of 0.5-0.8MPa and cool to room temperature;

[0023] Suspend and fix several temperature sensors in the passivation tank filled with passivation solution, and connect them with the heat exchanger, which is used to sense the temperature of the passivation solution at any time and feed it back to the heat exchanger to serve as a heat exchanger. Basis for keeping, heating or cooling;

[0024] (2) Primary passivation: use a heat exchanger to heat the passivation solution in the passivation tank to 40-50°C, then immerse the hot-dip galvanized steel sheet dried and cooled in step (1) into the passivation tank, Passivation at constant temperature for 30-60s;

[0025] (3) Secondary passivation: use the above...

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PUM

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Abstract

The invention discloses an adjusting method for the passivation temperature of a steel structure. The adjusting method includes the following steps that firstly, a galvanized steel plate is dried and cooled; secondly, first-level passivation is conducted; thirdly, second-level passivation is conducted; fourthly, third-level passivation is conducted; and fifthly, drying is conducted. According to the adjusting method for the passivation temperature of the steel structure, the segmented passivation temperature adjustment is conducted , porosity of a passivation film is effectively reduced, passivation quality is improved, meanwhile, adhesion stability of the passivation film is improved, and therefore passivation quality is effectively improved, corrosion resistance performance of a zinc coating is improved, and the salt spray resistance property of a passivated product is good.

Description

technical field [0001] The invention relates to the technical field of passivation of steel structures, in particular to a method for adjusting the passivation temperature of steel structures. Background technique [0002] Galvanizing is currently the most widely used anti-corrosion method for steel. However, since the zinc layer is easily corroded in the air, especially in a humid environment, it is necessary to passivate the galvanized steel plate to further improve the anti-corrosion performance of the product. [0003] The process conditions of passivation, especially the passivation temperature have a direct impact on the corrosion resistance of the zinc coating. Existing passivation methods mainly focus on the influence of passivation solution formula on passivation effect, but there are few studies on the influence of temperature conditions in the passivation process on passivation effect. Contents of the invention [0004] The technical problem mainly solved by th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/77
CPCC23C22/77
Inventor 赵月华黄荣新
Owner CHANGSHU FENGFAN POWER EQUIP
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