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Process for 5% aluminum-zinc alloy by hot immersion plating of iron and steel

A zinc alloy and hot-dip coating technology, which is applied in hot-dip coating process, metal material coating process, coating, etc., can solve the problem of low plating amount at one time and achieve the effect of dense coating

Active Publication Date: 2013-05-01
佛山市南海安的五金电器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention solves the problem that the primary coating amount is low during the existing hot-dip plating of 5% aluminum-zinc, and provides a method for hot-dip plating of 5% aluminum-zinc alloy without secondary dipping

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Add 50kg of aluminum ingots, 949.7kg of zinc ingots, 0.1kg of strontium grains and 0.2kg of germanium grains into the melting furnace. The temperature of the furnace is raised to 600°C. After the melting is completed, mechanically stir evenly, and then cast into strips to obtain 5% aluminum - Zinc alloy.

[0013] Degrease the 0.5m×2m carbon structural steel (Q235) with 15wt% caustic soda solution at 80°C for 1 hour, then wash it with clean water, and then pickle it with 10wt% hydrochloric acid solution. After pickling, rinse with water, dry, and then immerse in the plating solution obtained by melting the above 5% aluminum-zinc alloy. The dipping time is 30 seconds, the temperature of the plating solution is 460°C, and the coating weight is 734g. Accelerated corrosion test: 5% NaCl solution, test temperature 35±2°C, no red rust after 170 hours of test.

[0014] The plating solution is changed to be composed of 5% aluminum and 95% zinc, and the plating weight is 283g w...

Embodiment 2

[0016] The difference from Example 1 is that the immersion plating time is 120 seconds, the temperature of the plating solution is 470° C., and the plating amount reaches 795 g.

[0017] The plating solution is changed to be composed of 5% aluminum and 95% zinc, and the plating weight is 312g when other process conditions are the same.

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Abstract

The invention discloses a process for a 5% aluminum-zinc alloy by hot immersion plating of iron and steel, which comprises the following steps: 1)cleaning the steel; and 2) immersing the cleaned steel in a zinc aluminum plating liquid at the temperature of 460-470 DEG C to obtain a 5% aluminum-zinc alloy coating. The zinc aluminum plating liquid comprises the following components by mass percentage: 5% of aluminum, 0.01-0.015% of strontium, 0.02-0.03% of germanium and the balance of zinc. The primary plating alloy weight can reach 360-420g / m<2> by using the method, and the coating is compact and uniform.

Description

technical field [0001] The invention belongs to the field of hot-dip galvanizing, and in particular relates to a method for hot-dipping 5% aluminum-zinc alloy on the surface of steel. Background technique [0002] Iron and steel products are widely used in various fields of national life, and a large amount of scrap steel is caused by corrosion every year. At present, in order to prevent the corrosion of steel and steel products, the surface is usually coated with a zinc layer as a sacrificial anode. Adding a small amount of aluminum to the pure zinc coating can eliminate the iron-zinc alloy layer at the zinc-iron interface, making the plated parts more processable. When the added aluminum reaches 5%, the coating has both the anti-corrosion features of pure zinc and pure aluminum coatings However, when the aluminum content exceeds 0.03%, the probability that the steel surface cannot be plated increases greatly, resulting in the thickness of the coating being too thin to meet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C22C18/04
Inventor 高熠辉
Owner 佛山市南海安的五金电器有限公司
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