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Hot dip aluminum plating method for steel structure member

A technology for hot-dip aluminum plating and structural parts, applied in hot-dip plating process, coating, metal material coating process, etc. And the influence of personnel, the effect of reducing the amount of volatilization

Inactive Publication Date: 2014-01-15
北京海泰锐森环境能源技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the high content of fluoride covering salt in the hot-dip aluminum plating method in the prior art, and the covering salt volatilizes a large amount of toxic substances in the high-temperature aluminum bath, the subsequent removal of the covering salt is difficult, and the passivation method has a low qualified rate of products Problem, the present invention provides a new hot-dip aluminum plating method for steel structural parts, which greatly reduces the difficulty of removing covering salt, greatly reduces the content and volatilization of toxic fluoride, and has a good aluminum plating effect, completely avoiding large quantities Missing plating by passivation method under production conditions and low product qualification rate

Method used

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  • Hot dip aluminum plating method for steel structure member

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Effect test

Embodiment 1

[0037] The hot-dip aluminum plating method of the present invention is applied to the column pipe of the expressway.

[0038] Prepare the aluminum plating pot and the molten flux heating pot, put the corresponding materials in the pot respectively, and heat them to a molten state.

[0039] Dimensions of aluminized pot: inner diameter 1m* wall thickness 0.05m* depth 2.5m, containing 53 tons of aluminum, melted in about 24 hours.

[0040] Dimensions of molten flux heating pot: inner diameter 1m*depth 2.5m, containing 48 tons of molten flux.

[0041] The method of hot-dip aluminum plating for expressway column pipes is as follows:

[0042] 1) Pre-treatment: Clean the column pipe of the expressway before degreasing, derusting and aluminum plating;

[0043] 2) Aqueous solution electroplating treatment: perform aqueous solution electroplating treatment on the cleaned column tube;

[0044] 3) Drying: Dry the column tube coated with the transition aid;

[0045] 4) Flux treatment: ...

Embodiment 2

[0050] The hot-dip aluminizing method of the invention is applied to the corrugated guardrail beams of expressways.

[0051] According to the size of the plated parts, prepare the aluminum plating pot and the molten flux heating pot, put the corresponding materials in the pot respectively, and heat them to the molten state.

[0052] The hot-dip aluminum plating method for the corrugated guardrail beam of the expressway is as follows:

[0053] 1) Pre-treatment: Clean the highway guardrail beams before degreasing, derusting and aluminum plating;

[0054] 2) Aqueous solution electroplating treatment: perform aqueous solution electroplating treatment on the cleaned guardrail beam;

[0055] 3) Drying: Dry the guardrail beams coated with the crossing aid;

[0056] 4) Flux treatment: the mass percentage is 52% KCl, 42% NaCl, 3% Na 3 AlF 6 and 3% AlF 3 Throw it into the molten flux heating pot, and then add ZnCl which accounts for 5% of the sum of the above four substances in the...

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Abstract

The invention provides a hot dip aluminum plating method for a steel structure member, belonging to the technical field of metal anti-corrosion surface engineering. The hot dip aluminum plating method comprises the flows of: preplating of the steel structure member, aiding in plating of an aqueous solution, aiding in plating of a fused flux, hot dip aluminum plating and postplating, wherein the fused flux comprises the following components in mass percentages: 50-52% of KCl, 40-42% of NaCl, 3-5% of Na3AlF6 and 3-5% of Al; and an aluminum bath of the hot dip aluminum plating comprises the following components in mass percentages: 97.4-98.6% of Al, 1.2-1.5% of Zn, 0.08-1.0% of Sb and 0.1% of Ti, and the surface of the aluminum bath is covered by a fused covering agent containing 50% of NaCl and 50% of KCl in mass percentages. With the adoption of the hot dip aluminum plating method provided by the invention, a smooth and bright plating layer is produced without missing out, the steel structure member has high qualified rate, the content of toxic substances is low and the volatilization of the toxic substances is less in the aluminum plating process, and the hot dip aluminum plating method for the steel structure member has low impact on the health of workers and the environment.

Description

technical field [0001] The invention belongs to the technical field of metal anti-corrosion surface engineering, and relates to a hot-dip aluminizing method for steel structural parts, in particular to a flux-method hot-dip aluminizing method. Background technique [0002] Steel structural parts after hot-dip aluminizing have excellent atmospheric corrosion resistance, especially for 2 、H 2 S and NO 2 and other industrial gases. Tests have proved that the corrosion resistance of steel structural parts after aluminum plating is significantly better than that after galvanizing, but so far, the application of hot-dip aluminum plating in actual production is less than 2% of that of hot-dip galvanizing . Because the process of hot-dip aluminum plating is complicated in actual operation, the process conditions are strict, and there are great difficulties and technical bottlenecks. At present, hot-dip aluminum plating at home and abroad generally adopts the covering flux metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/12C23C2/30
Inventor 许雷
Owner 北京海泰锐森环境能源技术开发有限公司
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