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A chromium-free passivation process for steel structures

A chrome-free passivation and steel structure technology, which is applied in the coating process of metal materials, etc., can solve the problems of poor passivation effect and achieve the effects of simple operation, non-corrosion guarantee and stable quality

Active Publication Date: 2017-11-28
CHANGSHU FENGFAN POWER EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main technical problem to be solved by the present invention is to provide a chromium-free passivation process for steel structures, which can solve the problem of poor passivation effect caused by the existing chromium-free passivation process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A chromium-free passivation process for steel structures, the specific steps are as follows:

[0019] (1) Pre-passivation treatment: dry the hot-dip galvanized steel plate with compressed nitrogen at a temperature of 60 °C and a pressure of 0.5 MPa and cool to room temperature;

[0020] (2) Immersion passivation treatment: Dilute the chromium-free passivation solution with distilled water at a ratio of 3:1 and add it to the passivation tank, adjust the pH value of the passivation solution to 4 with a phosphate slow-release agent, and then the step ( 1) The hot-dip galvanized steel sheet after the pre-treatment is immersed in the passivation solution of the above-mentioned passivation tank;

[0021] Use a heat exchanger to adjust the temperature of the passivation solution in the passivation tank, insert multiple temperature sensors into the passivation solution, and connect the temperature sensors to the heat exchanger to sense the temperature of the passivation solutio...

Embodiment 2

[0026] A chromium-free passivation process for steel structures, the specific steps are as follows:

[0027] (1) Pre-passivation treatment: dry the hot-dip galvanized steel plate with compressed nitrogen at a temperature of 70 °C and a pressure of 0.8 MPa and cool to room temperature;

[0028] (2) Immersion passivation treatment: Dilute the chromium-free passivation solution with distilled water at a ratio of 5:1 and add it to the passivation tank, adjust the pH value of the passivation solution to 5.5 with a phosphate slow-release agent, and then apply the step ( 1) The hot-dip galvanized steel sheet after the pre-treatment is immersed in the passivation solution of the above-mentioned passivation tank;

[0029] Use a heat exchanger to adjust the temperature of the passivation solution in the passivation tank, insert multiple temperature sensors into the passivation solution, and connect the temperature sensors to the heat exchanger for sensing the temperature of the passivat...

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PUM

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Abstract

The invention discloses a steel structure chromium-free passivation technology. The steel structure chromium-free passivation technology comprises the following steps that firstly, passivation pretreatment is conducted; secondly, dipping passivation treatment is conducted, and two sections of passivation treatment is conducted under the ultrasonic-assisted conditions; and thirdly, passivation aftertreatment is conducted. The steel structure chromium-free passivation technology is easy and convenient to operate, easy to achieve and low in cost, and a prepared passive film is free of chromium, toxins and harm and environment-friendly. A passivated galvanized steel sheet is even in texture, stable in quality, good in salt mist resistance and yellowing resistance performance and capable of effectively ensuring the characteristic that the galvanized steel plate is not corroded after being used for a long time.

Description

technical field [0001] The invention relates to the technical field of metal passivation, in particular to a chromium-free passivation process for steel structures. Background technique [0002] Hot-dip galvanizing is one of the effective ways to improve the corrosion resistance of steel structure materials. It is widely used in many fields such as construction, transportation, machinery, electronics, and aviation. However, in a humid environment, especially in a hot and humid environment, the galvanized layer is prone to corrosion, causing the surface of the coating to form a dark gray or white loose corrosion product - white rust; after a long time, red rust will appear, thus losing the anti-corrosion effect. In order to improve the corrosion resistance of the coating, it is also necessary to immerse the plated steel structure material in a passivation solution for passivation treatment, so as to form a dense passivation film on the surface of the galvanized layer, thereby...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/73
CPCC23C22/73
Inventor 赵月华顾小蕾
Owner CHANGSHU FENGFAN POWER EQUIP